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COMPANY CHENWAY PRODUCT MANUA

Hunan Chenway Environmental Engineering Co., Ltd.is a professional enterprise engaged in the production of high-performance fluoroplastics and environmental govemance of exhaust gas desulfurization for acid productior

一、COMPANYPROFILE

CHENWAY-- -01-02
TECHNICALADVANTAGES -03-04

二、PRODUCTINTRODUCTION

PRODUCT- -05-18

COMPANYPROFILE

Hunan Chenway Environmental Engineering Co.,Ltd.was founded in 2oo5.Its headquarters is locatedin Zhuzhou High-Tech Industrial Park,enjoying convenienttransportation and complete industrial supporting facilities.With "resource utilizationof industrial exhaust gas"as its core development direction,the company focuses on the industrialization of WSA wet acid production technology,and simultaneously covers fields suchas industrialfue gasdesulfurizationand denitification,high-concentrationorganic waste water treatment,and resource utilizationof hazardous waste.It can provide full-chain EPC general contractingservices,ranging fromproject designand equipmentmanufacturing to instalation,commissioning,and operationand maintenance services.

After nearly 20 years of in-depth development, the company has become one of the leading enterprises in China's WSA wet acid production industry.Its core product,the WSA-wet acid production completesetof equipment, hasachieved a breakthrough in industrialapplication.The independentlydeveloped high-efficiency low-temperature conversion WSA acid production system has a conversion effciency of 9 9 . 8 % ,which can treat industrial exhaust gas with a sulfur concentration of 0 . 5 % 1 5 % .The maximum daily gas treatment capacity of a single set of equipment is 3 0 0 , 0 0 0 m ^ { 3 } / \mathsf { h } ,the concentration of sulfuric acid products is stablyabove 9 8 % ,and the exhaust gas emission concentration is lower than 5 0 m g / N m ^ { 3 } ,which isfar better than the national emission standards.

At present, the company's business has covered multiple fields including non-ferrous metal smelting,coal chemicalindustry,petrochemical industry,ironandsteelcoking,andfinechemicalindus try. Domestically, it has accumulatively completed more than 60 WSA wet acid production general contracting projects (turnkey projects), with a total exhaust gas treatment volume of over 50 milion m³/h, an annual sulfuric acid recovery of over 3 milion tons, and a reduction of sulfur dioxide emissions by more than 2 milion tons. Its overseas market has expanded to countries such as Zambia, Peru, and Kazakhstan.

TECHNICALADVANTAGES

The"HD-WSA"processpackageforwetsulfuricacidproductionfromsulfur-containinggases,developed byHunan Chenwei Environmental Engineering Co., Ltd.,covers the treatment of sulfur-containing compounds suchas H _ { 2 } S S O _ { 2 } C S _ { 2 } , and cos. Inthesystemequipment,thisprocesspackagefeatures highheatrecoveryandutilizationeffciency.Theheatexchange mediumadopts water-steamormoltensalt togeneratehigh-qualitysteam,whichcanbeusedforpowergenerationorheat supply.

Ifusershavestricteremisionrequirementsfortheprocesgasaftercondensation,Hunan Chenwei'sprocesspackagecanconductin-depth environmentaltreatmenton thecondensed processgas.Finaly,theconcentrationofsulfurdioxide ( \mathsf { S O } _ { 2 } ) in the tail gas discharged into the environment is controlled below 3 5 \mathsf { m g } / \mathsf { m } ^ { 3 } (under standard conditions),and the concentration of sulfuric acid mist ( H _ { 2 } S O _ { 4 } ) is controlled below 5 \mathsf { m g } / \mathsf { m } ^ { 3 } (under standard conditions).

PROCESSCHARACTERISTICS

Thesulfur recovery rate is over 9 9 % ,and the S O _ { 2 } emission in the tail gas is controlled within the emission standards.

It produces commercial-grade sulfuric acid with a concentration of more than 9 7 % 业 The entire unit is highly environmentally friendly,and the process generates no secondary waste.
It recoversa large amount of process reaction heat and by-produces high-quality steam.
The system is equipped with a DCS centralized control system,featuring high automation.
The unit has a large operating flexibility.
It has a wide raw material range and can treat waste gases containing H _ { 2 } S S O _ { 2 } , （2号 { \mathsf { C S } } _ { 2 } , COS, R-SH, etc.
It has a compact structure and simple layout.

PROCESSPRINCIPLE

Principle of the Process:

H2S(g)+1.502(g)-→SO2(g)+H2O(g)+518KJ/mole SO2(g)+0.502(g)->SO3(g)+99KJ/mole SO3(g)+H2O(g)->H2SO4(g)+101KJ/mole H2SO4(g)-→H2SO4(aq)+69KJ/mole NOx(g)+NH3(g)-→N2(g)+H2O(g) SO2(g)+H202(aq) H2SO4(aq) +306KJ/mole

Quality Control

Full-process quality control: A full-process quality control mechanism from raw material procurement to project acceptance has been established. In the raw material link, incoming inspection is conducted on core materials such as titanium and glass fiber reinforced plastic (FRP) to ensure the materials meet the requirements for corrosion resistance and strength. In the production link, the processing accuracy of key processes is controlled through the combination of real-time data monitoring of automated production lines and manual inspection.

In the assembly link, special tests such as air tightness test and pressure test are carried out to ensure no leakage of the units.

Before project delivery, joint full-process tests (including no-load test run and load test run) are conducted with customers; only after key parameters such as exhaust gas treatment efficiency， sulfuric acid product concen tration, and emission indicators meet the standards can the acceptance and delivery be completed.

AUTHORITATIVESYSTEMCERTIFICATION:

IthassuccessvelyotaidcertifationsforSO90QualityanagementSystm ISO14001 Environmental Management System, and ISO45001 Occupational Health and Safety Management System, ensuring the standardization of product quality and project services through management processes; the design, manufacturing, and installation of all WSA acid production units and supporting equipment comply with national special equipment safety regulations and industry standards.

EPC Field Equipment

The wet acid production technology can treat sulfur-containing compounds such as { \mathsf { H } } _ { 2 } { \mathsf { S } } , S O _ { 2 } , C S _ { 2 } (carbon disulfide),and COS.After incineration and/or purification,the sulfur-containing gas enters the converter. Underthe catalysis of vanadium catalyst S O _ { 2 } isoxidized to \mathsf { S O } _ { 3 } in the converter; subsequently,the process gas containing { \mathsf { S O } } _ { 3 } enters the acid condenser to generate liquid concentrated sulfuric acid ( H _ { 2 } S O _ { 4 } ) with a mass fraction of 2 9 8 % .The condensed process gas is discharged from the top of the condenser,while the produced concentrated sulfuricacid is cooled to 40 degrees Celsiusand then transported outward.

The heat energy recoveryand utilization rate of this system equipment is relatively high.The heat exchange medium is water-steam or molten salt,which can produce high-quality steam.This steam can be used for power generation or heat supply.If there are stricter emission requirements for the condensed process gas,it can also undergo in-depth environmental protection treatmentto achieve ultra-lowemissions.

WSA-MCU Acid Mist Control Unit

The acid mist control unit adopting the WSA wet acid production process can effectively optimize the acid condensation efficiency.Its working principle is as folows:Silicone oil particles are generated by burning silicone oil.These particles fully mix with the process gas through a high-efficiency mixer installed in the process pipeline between the converterand the condenser,and then enter the condenser together.

Whenthe process gas is cooled and condensed in the condenser,the silicone oil particles produced bytheacid mist control unit can act as crystal nuclei for gaseous H _ { 2 } S O _ { 4 } to condense into liquid H _ { 2 } S O _ { 4 } This function not only significantly improves the condensation efficiency of the condenser but also effectively reduces the H _ { 2 } S O _ { 4 } acid mist escaping from the condenser with the process gas.

WSACONDENSERUNIT1MAINTUBEWITHRIM

The glass tube material used in WSA wet acid production is quartz glass,with the following core performance advantages:

Excellent thermal shock resistance: Its linear expansion coefficient is extremely small,only 1/10 to \scriptstyle 1 / 2 0 that of borosilicate glass,so it is less prone to tube explosion and cracking during use. Outstanding heat resistance:The normal service temperature reaches 1 2 0 0 ^ { \circ } { \mathsf { C } } ,and the maximum service temperature can reach 1 3 0 0 ^ { \circ } { \mathsf { C } }
Strong acid corrosion resistance: It can effectively resistacid corrosion and has no scaling phenomenon during long-term use.

WSA-Finned Tube Heat Exchanger

The cooler of the finned tube heat exchanger used in WSA wet acid production is built inside the conversion reactor.Its core structure and material configuration are as follows: Main material: The shellside material is3O4H,and the channel box material is TP304H. Heat exchange tube design: Afinned tube structure isadopted.To prevent leakage,anadditional ceramic spray coating isapplied at the welded joints of the heat exchange tube elbows. Base tube specification: The base tube specification is \Phi 3 3 . 4 x 3 . 3 8 {mm } ,and itsmaterial isalso TP304H. Customization attribute:The height,thickness and density of the fins canbe flexibly customized according to the actual working condition requirements.

WSA CONDENSER -UNIT1DEMISTER

The core material of the WSA wet acid production mist eliminator is fluororesin produced by Daikin Japan. Its specific performance and process design are as follows:
Weaving process:The main body of the mist eliminator is woven into a mesh structure with modified fluororesin monofilaments of * \Phi 0 . 2 5 * 0 . 3 \mathsf {mm } in diameter.Forthe glass tube mist eliminator,a cylindrical weaving form isadopted,and the overallsize is ensured to fully meet the application requirements.
Temperature resistance range: It can achieve long-term stable operation under the working conditionof 2 0 0 ^ { \circ } C ,and the maximum limit service temperature can reach 2 5 0 ^ { \circ } C
Anti-caking property: When the temperature of the acid mist is { \le } 2 0 0 ^ { \circ } C ,the mist eliminator will not have caking phenomenon, ensuring smooth operation.

WSA-Catalyst

The dedicated catalyst for wet acid production adopts a unique formula and a seven-tooth plum blossom-shaped design,which can beadapted to the working conditions of high water vapor content in wet acid production.Its iconic seven-tooth plum blossom shape provides a larger specific surface area, higher dust holding capacity and lower pressure drop,efectively optimizing the spatial distribution of the catalyst in the converter.Among them,the cesium component contained in the catalyst performs outstandingly,with excellent performance in reducing the operating temperature and controlling S O _ { 2 } exhaust gas emissions.

Inaddition,through exclusive production processes and formulaadjustment,this catalyst further increasesthe specificsurface area and pore volume; moreover,it maintains highactivity withina wide temperature range,can beadapted toany bed layer of various converters,and has extremely strong applicability.

WSACONDENSERBAFFLEPLATES

It is manufactured by integral plate processing,with orifice plates machined by CNC (Computer Numerical Control),which strictly ensures the consistency of the center hole spacing.

WSACONDENSERCOATINGTOP COVER

Theliner for the top cover of the wet acid production condenser uses modified fluororesin resistant to concentrated sulfuric acid as the core processng material.This material can withstand a temperature of up to 1 5 0 ^ { \circ } C ,and has both excellent aging resistance and impermeability,enabling it to resist the corrosion of concentrated sulfuricacid and the impact of working conditions for a long time.

The rotational spray molding processis adopted in the processing link to realize the integral one-time molding of the liner.After molding,the surface of the liner is smooth and flat,and the thickness of the liner layer stably reaches 0 . 8 \mathsf {mm } at the same time,the material has extremely strong adhesion to the top cover matrix,and no falling off willoccur during long-term use, ensuring the operation tightness and safety of the equipment.

WSACONDENSERUNIT1DEMISTER

The core material of the WSA wetacid production mist eliminatoris fluororesin manufactured by Daikin Japan. Its specific performance and process design are as follows:
Weaving proces: The main body of the mist eliminator is woven into a mesh structure using modified fluororesin monofilaments witha diameter of \Phi 0 . 2 5 – 0 . 3mm .For glass tube mist eliminators,a cylindrical weaving pattern isadopted,and the overalldimensionsare strictly guaranteed to fully meet the application requirements.
Temperature resistance range: It can operate stably fora long time under the working condition of 2 0 0 ^ { \circ } C and the maximum limit service temperature can reach up to 2 5 0 ^ { \circ } C
Anti-caking property: When the temperature of the acid mist is { <= } 2 0 0 ^ { \circ } C ,the mist eliminator will not have caking, ensuring smooth operation.

WSA-CondenserShell

The shellis manufactured through the procurement of riveting and welding processes,followed byanair tightness test to ensure thereare no leakage points.

WSACONDENSERUNIT1UPPERTUBEPLATE

The upper tube sheet of the wet acid production condenser is manufactured using an integral plate processing method.The hole positions are precisely machined by CNC to ensure the accurate uniformity of the center distance between each hole,thus guaranteeing subsequent assembly precision.

After the steel parts pass the inspection, they undergo lining treatment.The raw materials forthe lining are special materials from DuPont(USA) or Daikin (Japan).After the lining is completed,the surface is heat-treated to further improve the service performance.The upper tube sheetcan withstand a temperature of \boldsymbol { 1 2 0 ^ { \circ } C } during long-term use, with a maximum tolerance temperature of \boldsymbol { 1 5 0 ^ { \circ } C } .It is suitable fora medium that isa mixture of S O _ { 3 } fluegasand 0 . 9 8 % concentrated sulfuric acid.

WSACONDENSERUNIT1COATEDLOWERTUBEPLATE

The lower tube sheet of the wet acid production condenser is manufactured via integral plate processing.The hole positions are precisely formed through CNC machining, ensuring the accurate uniformity ofthe center distance between each hole and providing a precise benchmark for the subsequent assembly of heat exchange tubes.

After the steel components pass the inspection,lining treatment is carried out.The raw materials for the lining are special-purpose materials from DuPont(USA) or Daikin (Japan). Upon completion of the lining,the surface undergoes heat treatment to enhance corrosion resistance and structural stability.This lower tube sheet can withstand a temperature of up to 2 9 0 ^ { \circ } C in long-term service, with a maximum temperature resistance of 3 1 0 ^ { \circ } C . It is suitable fora medium that isa mixture of S O _ { 3 } fluegasand 0 . 9 8 % concentrated sulfuric acid.

WSA--UNIT 1 GLASS SPIRALFORMAINTUBE

The material of the acid discharge pipe used in WSA wet acid production is quartz glass, with the following core performance advantages:
Excellent thermal shock resistance: Its linear expansion coeficient is extremely smal, only 1 / 1 0 t 1 / 2 0 thatof borosilicate glass,so it is lesslikely to have pipe explosion or cracking problems during use.
Outstanding heat resistance:The normal service temperature reaches { \boldsymbol { 1 2 0 0 ^ { \circ } C } } ,and the maximum service temperature can reach { 1 3 0 0 ^ { \circ } C }
Strong acid corrosion resistance: It can effectively resist acid corrosion and has no scaling phenomenon during long-term use.

WSA--BUSHINGFORUPPERTUBEPLATE

The material is made of fluororesin produced by Daikin Japan,and the CNC milling process is completed ina constant-temperature workshop.

WSA-Wire Mesh Mist Eliminator

The material is made offluororesin produced by Daikin Japan.
Weaving process: The wire mesh mist eliminator is woven into a mesh structure using modified fluororesinmonofilamentswithadiameterof \Phi 0 . 2 5 – 0 . 3mm ,and its overall dimensions meet the application requirements.
Temperature range: Itcan be used fora long time under the working condition of 2 0 0 ^ { \circ } C and the maximum limit service temperature can reach 2 5 0 ^ { \circ } C
Anti-caking performance: No caking willoccur when the temperature of the acid mist is ≤ 2 0 0 ^ { \circ } C ：

WSA--ACID COLLECTORACIDRESISTANTBRICKLINING

The high-temperature flue gas (witha temperature of 2 6 5 - 2 8 5 ^ { \circ } C fromthe wetacid production converter enters the WSA acid condenser through the bottom acid collection tank, where the acid production process is completed. In the acid condenser,the flue gas undergoes gas-liquid conversion to generate high-temperature concentrated sulfuric acid at approximately 2 4 5 ^ { \circ } C The concentrated sulfuric acid flows into the bottom acid collection tank for accumulation,and is then transported to the sulfuric acid circulation system through the acid discharge hose.

WSA--UNIT1LOCKTUBE

The material is made of fluororesin produced by Daikin Japan, manufactured through an extrusion process,with strictly controlled dimensional accuracy.

WSA-Scrubber

The body of the WSA wet acid production scrubber is made of fiberglass-reinforced plastic (FRP),which is suitable for the process environment requirements.Its designed operating temperature is 50 degrees Celsius,and the operating pressure is-3.9KPaG.The tower is filled with a section of polypropylene (PP) Pallring packing.The process gas entering from the bottom and the scrubbing liquid sprayed down from the top can fuly contact here, achieving efficient masstransfer.Inaddition,a wire mesh mist eliminator is also installed at the top of the tower to remove the liquid droplets entrained in the process gas.

WSA-Lower Tube Sheet Protection Plate

The raw materials are produced by DuPont (USA)or Daikin (Japan) and manufactured through stamping.Its long-term service temperature is 2 9 0 ^ { \circ } C ,maximum temperature resistance is 3 1 0 ^ { \circ } \mathsf C ,and theapplicable medium isa mixture of { S O } _ { 3 } fluegasand 0 . 9 8 % concentrated sulfuric acid.

WSA--UNIT1DRAINTUBE

The material is quartz glass, which has excellent thermal shock resistance.Its linear expansion coefficient is extremely small,being 1 / 1 0 to _ { 1 / 2 0 } that of borosilicate glass,so it is less likely to suffer from tube explosion or cracking.
It has high heat resistance, with a service temperature of 12oo图and a maximum limit service temperature of 1300.
It also exhibits superior acid corrosion resistance and willnot scale during use.

WSA-Circulating Acid Tank

It is manufactured usinga fluoroplastic spraying process. Before spraying,the surface of the steel parts is subjected to sandblasting for rust removal and roughening treatment,followed by sprayinga layer of high-temperature-resistantand corrosion-resistantfluoroplastic. The sulfuric acid captured by the glass tubes of the WSA acid condenser,with a temperature ofapproximately 245图,flows into the circulating acid tank through the acid discharge pipe of the condenser's acid colection tank.The high-temperature acid mixes with the sulfuric acid at around 4O in the circulating acid tank,and the temperature of the mixed sulfuric acid is about 6O.Then,it flows out of the circulating acid tank and is pumped to the acid cooler by the circulating acid pump.The temperature of the mixed sulfuric acid drops to around 40, with part ofit sent to the acid intermediate tank for storage and the other part returned to the circulating acid tank.

WSA-Flue Gas Expansion Joint

The material is made of fluororesin produced by Daikin Japan. Its long-term service temperature is \boldsymbol { 1 2 0 ^ { \circ } C } ,maximum temperature resistance is 2 0 0 ^ { \circ } \mathsf C ,and the applicable medium isa mixture of S O _ { 3 } flue gasand 0 . 9 8 % concentrated sulfuric acid.