WO2024074057A1 - Self-consistent resourceful treatment apparatus and method for salt-containing wastewater and hydrochloric acid-containing waste gas - Google Patents

Self-consistent resourceful treatment apparatus and method for salt-containing wastewater and hydrochloric acid-containing waste gas Download PDF

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Publication number
WO2024074057A1
WO2024074057A1 PCT/CN2023/102416 CN2023102416W WO2024074057A1 WO 2024074057 A1 WO2024074057 A1 WO 2024074057A1 CN 2023102416 W CN2023102416 W CN 2023102416W WO 2024074057 A1 WO2024074057 A1 WO 2024074057A1
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Prior art keywords
hydrochloric acid
self
waste gas
salt
absorption
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PCT/CN2023/102416
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French (fr)
Chinese (zh)
Inventor
刘畅
田义群
桂厚瑛
曹杰
桂绍庸
彭春雪
宁静
张锐
刘渊
覃立忠
刘三六
李成强
吴茂胜
王炜
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湖北泰盛化工有限公司
武汉正清和环保科技开发有限公司
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Publication of WO2024074057A1 publication Critical patent/WO2024074057A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/68—Halogens or halogen compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/01—Chlorine; Hydrogen chloride
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D3/00—Halides of sodium, potassium or alkali metals in general
    • C01D3/04—Chlorides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0041—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for only one medium being tubes having parts touching each other or tubes assembled in panel form

Definitions

  • the invention relates to the technical field of industrial wastewater and waste gas treatment, and in particular to a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas.
  • mechanical evaporation technology Compared with natural evaporation crystallization technology, mechanical evaporation technology has the advantages of small equipment footprint and high efficiency. However, due to mechanical evaporation, scaling is easily generated on the inner wall of the evaporator system, salt discharge is easy to block the channel, and the pipeline is easily corroded for a long time. Therefore, it is necessary to find a more efficient, less likely to block the pipeline and energy-saving method for treating saline wastewater.
  • waste gas containing hydrochloric acid Industrial production is often accompanied by the generation of waste gas containing hydrochloric acid.
  • a large amount of hydrogen chloride gas in the waste gas is highly corrosive. If it is directly discharged into the external environment, it will cause great pollution to the environment.
  • Existing waste gas will be absorbed before it is discharged to absorb the highly corrosive gas.
  • Existing waste gas absorption technology mostly uses conventional absorption towers, and the absorption effect of hydrogen chloride is poor. In the end, there is still a lot of hydrogen chloride gas remaining in the discharged waste gas.
  • the purpose of the present invention is to provide a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas, so as to solve the technical problems of easy scaling, low absorption efficiency, high treatment cost and great environmental risks caused by the separate treatment of saline wastewater and hydrochloric acid waste gas in the prior art.
  • a self-consistent resource treatment device for salt-containing wastewater and hydrochloric acid waste gas includes an absorption tower, a circulating cooler and a cooling forced circulation pump, a wastewater inlet is provided at the bottom end of the absorption tower, the bottom end of the absorption tower is connected to the bottom end of the circulating cooler through a pipeline, the pipeline at the top of the circulating cooler extends to the interior of the absorption tower, and a cooling forced circulation pump is provided on the pipeline connecting the bottom end of the circulating cooler with the absorption tower.
  • a venturi is provided at the top of the absorption tower, and a water inlet is provided at the bottom.
  • a lateral air inlet is provided at the top of the venturi, and a tubular trumpet-type nozzle is provided at the bottom of the venturi.
  • the longitudinal liquid inlet of the venturi is connected with one end of the absorption liquid circulation pump through a pipeline, and the other end of the absorption liquid circulation pump is connected with the inside of the absorption tower, and the air inlet sucks in hydrochloric acid-containing waste gas.
  • a demister is provided at the top of the absorption tower.
  • a baffle is provided at the outlet of the pipeline extending from the top of the circulating cooler to the inside of the absorption tower.
  • a retaining ring is provided on the inner wall of the absorption tower at the position where the absorption tower is connected to the absorption liquid circulation pump.
  • a liquid level meter is installed on one side of the absorption tower.
  • a pipeline connected to an automatic solid-liquid level regulating valve is provided at the bottom of the absorption tower, a discharge valve is provided at the bottom of the automatic solid-liquid level regulating valve, and the automatic solid-liquid level regulating valve is interlocked with the discharge valve.
  • the present invention also provides a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas, comprising the following steps:
  • the obtained absorption liquid continues to undergo a self-consistent absorption reaction with the hydrochloric acid-containing waste gas through an absorption liquid circulation pump, solids are precipitated, and a solid-liquid mixture is obtained. After sedimentation and centrifugal separation, the solid-liquid mixture is obtained to obtain industrial-grade salt and industrial-grade hydrochloric acid.
  • the flow rate of the saline wastewater is 4.0-5.0 m 3 /h, preferably 4.2-4.8 m 3 /h, and more preferably 4.5 m 3 /h;
  • the flow rate of the hydrochloric acid waste gas is 200.0-350.0 m 3 /h, preferably 230.0-320.0 m 3 /h, and more preferably 280.0-300.0 m 3 /h.
  • the temperature of the self-consistent absorption reaction is independently 25 to 35°C, preferably 28 to 32°C, and more preferably 29 to 31°C; the residence time of the material in the self-consistent absorption reactor is independently 60 to 90 min, preferably 75 to 85 min, and more preferably 80 min.
  • step (2) the circulating cooler cools the absorption liquid to 25-35°C, preferably 22-28°C, and more preferably 24-26°C.
  • the self-consistent resource recovery treatment method for saline wastewater and hydrochloric acid waste gas can be successfully implemented in the self-consistent resource recovery treatment device for saline wastewater and hydrochloric acid waste gas.
  • Another technical solution of the present invention provides an industrial-grade salt and industrial-grade hydrochloric acid prepared by resource recovery, which are prepared by the self-consistent resource recovery treatment method of salt-containing wastewater and hydrochloric acid-containing waste gas.
  • the TOC of the prepared industrial-grade salt is less than 5 mg/L, and the purity of the industrial-grade salt is greater than 99.0%, more preferably greater than or equal to 99.3%, more preferably greater than or equal to 99.5%, and more preferably greater than or equal to 99.8%.
  • the industrial-grade hydrochloric acid prepared meets the requirements of qualified products, more preferably meets the requirements of first-class products, and further preferably meets the requirements of superior products.
  • the technical scheme of the present invention can dissolve the industrial salt produced as a by-product in the production of pharmaceutical raw materials and intermediates, such as TOC of more than 5000 mg/L, into a saturated solution with deionized water and then conduct a self-consistent resource treatment method with hydrochloric acid-containing waste gas.
  • the method of the present invention can obtain high-quality refined industrial salt with TOC less than 5 mg/L, and the quality meets the requirements of GB/T5462-2015 chlor-alkali industry.
  • the treatment method of the present invention can synchronously react industrial wastewater and industrial waste gas to obtain industrial-grade salt and industrial hydrochloric acid; the present invention simultaneously introduces saline wastewater and hydrochloric acid waste gas into a self-consistent absorption and precipitation reactor to perform a self-consistent absorption reaction, and according to the common ion effect, the salt in the saline wastewater gradually precipitates NaCl crystals to obtain a solid-liquid mixture, and the solid-liquid mixture is separated by sedimentation to obtain industrial-grade salt and industrial-grade hydrochloric acid, thereby avoiding the need for large equipment footprints, and also avoiding the need for a lot of scaling on the inner wall to block the salt outlet channel, and the long-term easy corrosion of the pipeline, thereby solving the problem of easy scaling and low treatment efficiency of saline wastewater and hydrochloric acid waste gas in the prior art.
  • the treatment method of the present invention can synchronously react industrial wastewater and industrial waste gas to obtain industrial-grade salt, and the obtained industrial-grade salt can be directly sold on the market or used in the chlor-alkali industry, and the obtained hydrochloric acid can be used as a raw material for producing refrigerant CaCl2 ; thereby achieving resource utilization at the same time.
  • the obtained industrial-grade salt can be directly sold on the market or used in the chlor-alkali industry, and the obtained industrial hydrochloric acid can be used as a raw material for the refrigerant CaCl 2.
  • the treatment method of the present invention is different from the conventional spray absorption reactor method, does not use tower plates and fillers, and will not cause the problem of salt clogging the reactor.
  • the self-consistent absorption reactor of the present invention is provided with a cooling forced circulation pump and a circulating cooler, which can greatly reduce the temperature inside the absorption tower for heat exchange.
  • a venturi is provided at the top of the absorption tower, which continuously draws the hydrochloric acid-containing waste gas under the action of the absorption circulating liquid flow, thereby ensuring the normal reaction inside the absorption tower to produce salt and industrial hydrochloric acid.
  • the HCl in the hydrochloric acid-containing waste gas is completely absorbed by the wastewater to generate hydrochloric acid, and according to the common ion effect, the salt in the wastewater is completely precipitated to generate salt particles; thus, the NaCl in the wastewater is completely precipitated to generate industrial salt, and the HCl in the waste gas is absorbed to generate industrial hydrochloric acid, thereby realizing resource utilization, realizing waste utilization while treating wastewater and waste gas, and saving costs, so as to realize resource utilization of salt-containing wastewater and hydrochloric acid-containing waste gas.
  • the self-consistent absorption reactor of the present invention does not need to be equipped with a tower plate or a filler, and the gas and liquid react in direct contact. A common ion effect occurs in the reactor, and salt can be precipitated. The following reactions occur in the reactor:
  • the self-consistent absorption reactor under its specific and compact structure, involves processes such as venturi absorption, laminar enrichment, orderly crystal growth, forced circulation cooling, and efficient liquid-solid separation.
  • the efficient and stable control of its material balance and thermodynamic equilibrium requires model simulation calculations and unique innovative thinking. It can not only realize the resource treatment of saline wastewater and hydrochloric acid waste gas, but also realize the refining of crude salt.
  • the obtained crystalline salt has high purity and can be used efficiently in industrial areas.
  • Figure 1 is a schematic diagram of the structure of the self-consistent absorption reactor of the present invention, wherein 1-absorption tower, 2-circulating cooler, 3-liquid level meter, 4-solid-liquid level automatic regulating valve, 5-demister, 6-Venturi tube, 7-baffle, 8-absorption liquid circulation pump, 9-cooling forced circulation pump, 10-discharge valve, 11-baffle ring, 12-wastewater inlet, 13-lateral air inlet, 14-exhaust gas outlet.
  • FIG. 2 is a crystal microscope photograph of NaCl obtained in Example 1.
  • the present invention provides a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas, comprising the following steps:
  • the saline wastewater contains NaCl
  • the hydrochloric acid waste gas contains HCl gas.
  • the flow rate of the saline wastewater is 4.0-5.0 m 3 /h, preferably 4.2-4.8 m 3 /h, more preferably 4.5 m 3 /h;
  • the flow rate of the hydrochloric acid waste gas is 200.0-350.0 m 3 /h, preferably 230.0-320.0 m 3 /h, more preferably 280.0-300.0 m 3 /h.
  • the temperature of the self-consistent absorption reaction is independently 25-35°C, preferably 28-32°C, and more preferably 29-31°C; the residence time of the material in the self-consistent absorption reactor is independently 60-90min, preferably 75-85min, and more preferably 80min.
  • step 2) the circulating cooler cools the absorption liquid to 25-35°C, preferably 22-28°C, and more preferably 24-26°C.
  • the self-consistent resource recovery method for treating saline wastewater and hydrochloric acid waste gas of the present invention can also be used for refining crude salt.
  • the self-consistent absorption reactor comprises an absorption tower 1, a circulating cooler 2 and a cooling forced circulation pump 9, a wastewater inlet 12 is provided at the bottom of the absorption tower 1, the bottom of the absorption tower 1 is connected to the bottom of the circulating cooler 2 through a pipeline, the pipeline at the top of the circulating cooler 2 extends to the inside of the absorption tower 1, a cooling forced circulation pump 9 is provided on the pipeline connected to the absorption tower 1 at the bottom of the circulating cooler 2, a shell-side water inlet is provided at the top of the circulating cooler 2, and a shell-side water outlet is provided at the bottom, water enters from the top and exits from the bottom, heat is exchanged with the tube-side absorption liquid inside the circulating cooler 2, and the temperature is reduced, and the absorption liquid is intensively cooled by the circulating cooler 2 and the cooling forced circulation pump 9, which can quickly reduce the temperature generated by the reaction.
  • the circulating cooler 2 is provided with a cooling water inlet and outlet that enter from the top and exit from the bottom
  • a venturi 6 is provided at the top of the absorption tower 1, and a water inlet is provided at the bottom.
  • the venturi 6 is used to inhale tail gas containing hydrochloric acid.
  • a tubular trumpet nozzle is provided at the bottom of the venturi 6.
  • a transverse air inlet 13 is provided at the top of the venturi 6.
  • the longitudinal liquid inlet of the venturi 6 is connected to one end of an absorption liquid circulation pump 8 through a pipeline.
  • the other end of the absorption liquid circulation pump 8 is connected to the inside of the absorption tower 1, and the air inlet inhales waste gas containing hydrochloric acid.
  • a tail gas outlet 14 is also provided at the top of the absorption tower 1, and the tail gas at the tail gas outlet goes to the tail gas absorption device.
  • a demister 5 is further provided at the top of the absorption tower 1 for removing liquid foam in the residual tail gas.
  • a baffle 7 is provided at the outlet of the pipe extending from the top of the circulating cooler 2 to the inner pipe of the absorption tower 1, and the baffle 7 changes the absorption liquid in the pipe from turbulent flow to laminar flow, so as to facilitate the sedimentation of salt particles.
  • a retaining ring 11 is further provided on the inner wall of the absorption tower 1 at the position where it is connected to the absorption liquid circulation pump 8, which is used to separate the absorption reaction zone and the precipitation and sedimentation zone to ensure that the circulating absorption liquid drawn in by the absorption liquid circulation pump 8 carries as few salt particles as possible, so as to facilitate the normal operation of the absorption liquid circulation pump, and also facilitate the absorption of HCl in the exhaust gas and the precipitation and sedimentation of salt particles.
  • the self-consistent absorption reactor of the present application is provided with a baffle 7 and a baffle ring 11.
  • the range enclosed by the baffle ring in the lower layer of the baffle and the lower cone and slender "salt leg" of the absorption reactor form a laminar flow area, which is conducive to the sedimentation and enrichment of solids, ensuring that the circulating absorption liquid contains no or as little solid particles as possible, preventing clogging of the pipeline and improving the liquid-solid separation effect.
  • a liquid level meter 3 is installed on one side of the absorption tower 1 , and the liquid level inside the absorption tower 1 is determined by the liquid level meter 3 .
  • the bottom end of the absorption tower 1 is also provided with a pipeline connected to the solid-liquid level automatic regulating valve 4, and the bottom end of the solid-liquid level automatic regulating valve 4 is provided with a discharge valve 10, and the solid-liquid level automatic regulating valve 4 is interlocked with the discharge valve 10.
  • the regulating valve 4 is used to control the solid-liquid level of the absorption tower, and the discharge valve 10 is used to control the discharge of salt and industrial hydrochloric acid to the centrifuge.
  • saline wastewater enters from the bottom of the absorption tower 1, and waste gas containing hydrochloric acid is sucked into the lateral air inlet arranged at the top of the venturi tube 6. After being forcibly mixed with the absorption liquid from the absorption liquid circulation pump 8 through the venturi tube 6, it enters the absorption tower 1.
  • the wastewater absorbs HCl in the waste gas to generate hydrochloric acid.
  • the salt in the wastewater is gradually or even completely precipitated due to the common ion effect.
  • the salt particles and industrial hydrochloric acid settle to the bottom of the absorption tower 1 and are discharged through the discharge valve 10.
  • the salt and the industrial hydrochloric acid are separated by a centrifuge.
  • the salt can be sold as industrial salt after the quality is analyzed and meets the standard, and the industrial hydrochloric acid can be used as a raw material for preparing the refrigerant CaCl2 .
  • the waste gas after absorbing HCl passes through the demister 5 and enters other waste gas treatment devices to meet the emission standards; the absorption liquid inside the absorption tower 1 will be affected by the cooling forced circulation pump 9, and enter the circulation cooler 2 from the pipeline connected to the circulation cooler 2 at the bottom of the absorption tower 1.
  • the cooled absorption liquid enters the absorption tower 1 from the top pipeline of the circulation cooler 2, forming turbulence.
  • the turbulence is blocked by the baffle 7 inside the absorption tower 1 to form laminar flow, thereby alleviating the tumbling of the fluid and facilitating the precipitation of the generated salt particles.
  • the saline wastewater and the hydrochloric acid waste gas were continuously introduced into the self-consistent absorption reactor simultaneously.
  • the flow rate of the saline wastewater was 4.3 m 3 /h, and the flow rate of the hydrochloric acid waste gas was 260.0 m 3 /h.
  • the salt-containing wastewater and hydrochloric acid waste gas undergo a self-consistent absorption reaction in the reactor.
  • the absorption reaction stays for 65 minutes.
  • the absorption liquid in the absorption tower is cooled by a circulating cooler to reduce the temperature generated by the reaction. After the absorption liquid is cooled to 25°C, it is further self-consistently absorbed by the absorption liquid circulation pump and the hydrochloric acid waste gas sucked into the venturi.
  • the salt in the salt-containing wastewater gradually precipitates NaCl crystals. After analysis, when the hydrochloric acid concentration is 31%, the NaCl crystals are completely precipitated.
  • the solid-liquid mixture is separated by a centrifuge to obtain solid industrial-grade salt and liquid industrial-grade hydrochloric acid.
  • the obtained industrial salt is tested according to the national standard GB/T5462-2015, and all indicators meet the requirements.
  • a self-consistent absorption reactor with the above structure is used to form a laminar flow area in the gas-liquid mixing area, and NaCl crystals grow in an orderly manner. After the orderly growth process of the crystals, the NaCl crystals are transparent, and no impurities that affect the quality of NaCl are encapsulated during the crystallization process, thereby achieving NaCl refining, which can be used in the chlor-alkali industry.
  • a microscope photo of NaCl crystals that have grown in an orderly manner in the laminar flow area shows uniform particle size, transparency, and no encapsulation.
  • Liquid industrial-grade hydrochloric acid meets the superior product indicators in GB/T 320-2006.
  • the saline wastewater and the hydrochloric acid waste gas were simultaneously and continuously introduced into the self-consistent absorption reactor.
  • the flow rate of the saline wastewater was 4.5 m 3 /h
  • the flow rate of the hydrochloric acid waste gas was 290.0 m 3 /h.
  • the salt-containing wastewater and the hydrochloric acid waste gas undergo a self-consistent absorption reaction in the reactor.
  • the absorption reaction stays for 75 minutes.
  • the absorption liquid in the absorption tower is cooled by a circulating cooler to reduce the temperature generated by the reaction. After the absorption liquid is cooled to 28°C, it is further subjected to a self-consistent absorption reaction with the hydrochloric acid waste gas sucked by the venturi tube through the absorption liquid circulation pump.
  • the salt in the salt-containing wastewater gradually precipitates NaCl crystals. After analysis, when the hydrochloric acid concentration is 30.5%, the NaCl crystals are completely precipitated.
  • the obtained solid-liquid mixture is separated by a centrifuge to obtain solid industrial-grade salt and liquid industrial-grade hydrochloric acid.
  • the obtained industrial salt is tested according to the national standard GB/T5462-2015, and all indicators meet the requirements.
  • the crystal microscope photo of the obtained NaCl is basically the same as that of Example 1, with uniform and transparent particle size and no encapsulation phenomenon.
  • the liquid industrial-grade hydrochloric acid meets the superior product indicators in GB/T 320-2006.
  • the saline wastewater and the hydrochloric acid waste gas are continuously introduced into the self-consistent absorption reactor simultaneously.
  • the flow rate of the saline wastewater is 5.0 m 3 /h
  • the flow rate of the hydrochloric acid waste gas is 350 m 3 /h.
  • the salt-containing wastewater and the hydrochloric acid waste gas undergo a self-consistent absorption reaction in the reactor. After the absorption reaction stays for 75 minutes, the absorption liquid in the absorption tower is cooled by a circulating cooler to reduce the temperature generated by the reaction. After the absorption liquid is cooled to 33°C, it is further subjected to a self-consistent absorption reaction by the absorption liquid circulation pump and the hydrochloric acid waste gas sucked into the venturi. In the continuous absorption reaction, due to the common ion effect, the salt in the salt-containing wastewater gradually precipitates NaCl crystals. When the hydrochloric acid concentration is 31.5%, the NaCl crystals are completely precipitated.
  • the solid-liquid mixture obtained is separated by a centrifuge to obtain solid industrial-grade salt and liquid industrial-grade hydrochloric acid.
  • the obtained industrial salt is tested according to the national standard GB/T5462-2015, and all indicators meet the requirements.
  • the crystal microscope photo of the obtained NaCl is basically the same as that of Example 1, with uniform and transparent particle size and no encapsulation.
  • the liquid industrial-grade hydrochloric acid meets the superior product indicators in GB/T 320-2006.
  • the present invention provides a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas.
  • the treatment method of the present invention not only conducts a self-consistent reaction on two industrial pollutants and removes them at the same time, but also generates high-purity salt that can be used in industry.
  • the self-consistent absorption reactor of the present invention will not cause problems such as salt clogging and corrosion of pipelines, and can efficiently and continuously treat saline wastewater and hydrochloric acid waste gas.
  • the industrial hydrochloric acid obtained after the reaction can be used to prepare the refrigerant CaCl2
  • the treatment method of the invention is simple and easy to implement, the equipment occupies a small area, and the operation is convenient, and it can industrially treat salt-containing wastewater and hydrochloric acid-containing waste gas.

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Abstract

A self-consistent resourceful treatment apparatus and method for salt-containing wastewater and hydrochloric acid-containing waste gas, relating to the technical field of industrial wastewater and waste gas treatment. The method comprises: simultaneously introducing the salt-containing wastewater and the hydrochloric acid-containing waste gas into a self-consistent absorption reactor to perform self-consistent absorption reaction; gradually precipitating NaCl crystals from salt in the salt-containing wastewater according to a common-ion effect to obtain a solid-liquid mixture; and performing settling separation on the solid-liquid mixture to obtain industrial-grade salt and industrial-grade hydrochloric acid. According to the treatment method, industrial wastewater and industrial waste gas can be synchronously reacted to obtain industrial-grade salt, the obtained industrial-grade salt can be directly commercially available or used in the chlor-alkali industry, and the obtained hydrochloric acid can be used as a raw material for producing a refrigerant CaCl2, such that resource utilization is realized at the same time. The treatment method is different from a conventional spray-type reactor method, does not use a tower plate and a filler, and does not cause the problem that a reactor is blocked by discharged salt.

Description

一种含盐废水和含盐酸废气自洽式资源化处理装置及方法A self-consistent resource treatment device and method for salt-containing wastewater and hydrochloric acid waste gas 技术领域Technical Field
本发明涉及工业废水、废气处理技术领域，尤其涉及一种含盐废水和含盐酸废气自洽式资源化处理方法。The invention relates to the technical field of industrial wastewater and waste gas treatment, and in particular to a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas.
背景技术Background technique
工业发展是环境污染的主要源头，含盐废水的排放处理是解决环境污染问题的一大重点。目前，含盐废水处理技术大多数采用生化处理法，但是由于多变性及难降解的有机污染物的存在，往往导致常规的生化处理工艺很难奏效，使处理后的排水不能达到排放标准。也有研究采用自然蒸发结晶和机械蒸发的方法处理含盐废水，自然蒸发结晶技术需要较大的蒸发塘以待其自然蒸发，由于占地面积较大且效率较低，不能满足对含盐废水的处理的要求。机械蒸发技术相比于自然蒸发结晶技术，一是所需设备占地面积小，二是机械蒸发技术效率高。但是由于机械蒸发很容易出现在蒸发器系统的内壁上产生结垢，出盐容易堵塞通道，且长时间易腐蚀管道的问题。因此需要寻找一种效率更高、不易堵塞管道且节能的方法用于处理含盐废水。Industrial development is the main source of environmental pollution, and the discharge and treatment of saline wastewater is a major focus in solving environmental pollution problems. At present, most saline wastewater treatment technologies use biochemical treatment methods, but due to the variability and presence of difficult-to-degrade organic pollutants, conventional biochemical treatment processes are often difficult to work, so that the treated wastewater cannot meet the discharge standards. There are also studies that use natural evaporation crystallization and mechanical evaporation methods to treat saline wastewater. Natural evaporation crystallization technology requires a larger evaporation pond for natural evaporation. Due to its large footprint and low efficiency, it cannot meet the requirements for the treatment of saline wastewater. Compared with natural evaporation crystallization technology, mechanical evaporation technology has the advantages of small equipment footprint and high efficiency. However, due to mechanical evaporation, scaling is easily generated on the inner wall of the evaporator system, salt discharge is easy to block the channel, and the pipeline is easily corroded for a long time. Therefore, it is necessary to find a more efficient, less likely to block the pipeline and energy-saving method for treating saline wastewater.
工业生产常常也伴随着产生含盐酸废气，废气中大量的氯化氢气体具有高腐蚀性，如果直接排放到外界环境中，将对环境造成极大的污染，现有的废气在进行排放前会进行废气吸收，以吸收其中的高腐蚀性气体。现有的废气吸收技术多采用常规吸收塔进行，氯化氢的吸收效果较差，最后排放出的废气中依旧残留有较多氯化氢气体。Industrial production is often accompanied by the generation of waste gas containing hydrochloric acid. A large amount of hydrogen chloride gas in the waste gas is highly corrosive. If it is directly discharged into the external environment, it will cause great pollution to the environment. Existing waste gas will be absorbed before it is discharged to absorb the highly corrosive gas. Existing waste gas absorption technology mostly uses conventional absorption towers, and the absorption effect of hydrogen chloride is poor. In the end, there is still a lot of hydrogen chloride gas remaining in the discharged waste gas.
因此，如何得到一种可以将含盐废水和含盐酸废气协同处理并实现其资源化的方法是目前需要解决的技术问题。Therefore, how to obtain a method that can synergistically treat salt-containing wastewater and hydrochloric acid waste gas and realize their resource utilization is a technical problem that needs to be solved at present.
发明内容Summary of the invention
本发明的目的在于提供一种含盐废水和含盐酸废气自洽式资源化处理方法，以解决现有技术中含盐废水和含盐酸废气单独处理带来的易结垢、吸收效率不高、处理成本高、环保隐患大的技术问题。The purpose of the present invention is to provide a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas, so as to solve the technical problems of easy scaling, low absorption efficiency, high treatment cost and great environmental risks caused by the separate treatment of saline wastewater and hydrochloric acid waste gas in the prior art.
为了实现上述发明目的，本发明提供以下技术方案：In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:
一种含盐废水和含盐酸废气自洽式资源化处理装置，自洽式吸收反应器包括吸收塔、循环冷却器以及冷却强制循环泵，所述吸收塔底端设有废水进口，所述吸收塔底端通过管道与所述循环冷却器底端连接，所述循环冷却器的顶端的管道延伸至吸收塔的内部，所述循环冷却器底端与吸收塔连接的管道上设置有冷却强制循环泵。 A self-consistent resource treatment device for salt-containing wastewater and hydrochloric acid waste gas, the self-consistent absorption reactor includes an absorption tower, a circulating cooler and a cooling forced circulation pump, a wastewater inlet is provided at the bottom end of the absorption tower, the bottom end of the absorption tower is connected to the bottom end of the circulating cooler through a pipeline, the pipeline at the top of the circulating cooler extends to the interior of the absorption tower, and a cooling forced circulation pump is provided on the pipeline connecting the bottom end of the circulating cooler with the absorption tower.
进一步的，所述吸收塔的顶端设置有文氏管，底端设置有进水口，所述文氏管顶端设置有横向进气口，文氏管底端设置有管状喇叭式喷头，文氏管纵向进液口通过管道与吸收液循环泵的一端相连通，吸收液循环泵的另一端与吸收塔内部相连通，进气口吸入有含盐酸废气。Furthermore, a venturi is provided at the top of the absorption tower, and a water inlet is provided at the bottom. A lateral air inlet is provided at the top of the venturi, and a tubular trumpet-type nozzle is provided at the bottom of the venturi. The longitudinal liquid inlet of the venturi is connected with one end of the absorption liquid circulation pump through a pipeline, and the other end of the absorption liquid circulation pump is connected with the inside of the absorption tower, and the air inlet sucks in hydrochloric acid-containing waste gas.
进一步的，所述吸收塔的顶端还设置有除沫器。Furthermore, a demister is provided at the top of the absorption tower.
进一步的，所述循环冷却器顶端延伸至吸收塔内部管道的出口处设置有挡板。Furthermore, a baffle is provided at the outlet of the pipeline extending from the top of the circulating cooler to the inside of the absorption tower.
进一步的，所述吸收塔与吸收液循环泵连通的位置处的内壁还设置有挡环。Furthermore, a retaining ring is provided on the inner wall of the absorption tower at the position where the absorption tower is connected to the absorption liquid circulation pump.
进一步的，所述吸收塔的一侧安装有液位计。Furthermore, a liquid level meter is installed on one side of the absorption tower.
进一步的，所述吸收塔的底端还设置有管道与含固液位自动调节阀连接，所述含固液位自动调节阀底端设置有出料阀，所述含固液位自动调节阀与出料阀连锁。Furthermore, a pipeline connected to an automatic solid-liquid level regulating valve is provided at the bottom of the absorption tower, a discharge valve is provided at the bottom of the automatic solid-liquid level regulating valve, and the automatic solid-liquid level regulating valve is interlocked with the discharge valve.
针对上述装置，本发明还提供了一种含盐废水和含盐酸废气自洽式资源化处理方法，包括以下步骤：In view of the above-mentioned device, the present invention also provides a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas, comprising the following steps:
(1)将含盐废水和含盐酸废气同时通入自洽式吸收反应器中，进行自洽式吸收反应，得到吸收液；(1) introducing salt-containing wastewater and hydrochloric acid-containing waste gas into a self-consistent absorption reactor at the same time to carry out a self-consistent absorption reaction to obtain an absorption liquid;
(2)通过循环冷却器及冷却强制循环泵对吸收液进行降温，控制吸收液温度，以利于废气中HCl的吸收；(2) Cooling the absorption liquid by a circulating cooler and a cooling forced circulation pump to control the temperature of the absorption liquid to facilitate the absorption of HCl in the exhaust gas;
(3)所得吸收液通过吸收液循环泵继续与含盐酸废气进行自洽式吸收反应，析出固体，得到固液混合物，固液混合物经过沉降及离心分离后即得到工业级盐及工业级盐酸。(3) The obtained absorption liquid continues to undergo a self-consistent absorption reaction with the hydrochloric acid-containing waste gas through an absorption liquid circulation pump, solids are precipitated, and a solid-liquid mixture is obtained. After sedimentation and centrifugal separation, the solid-liquid mixture is obtained to obtain industrial-grade salt and industrial-grade hydrochloric acid.
进一步的，所述含盐废水的流量为4.0～5.0m3/h，优选为4.2～4.8m3/h，进一步优选为4.5m3/h；所述含盐酸废气的流量为200.0～350.0m3/h，优选为230.0～320.0m3/h，进一步优选为280.0～300.0m3/h。Furthermore, the flow rate of the saline wastewater is 4.0-5.0 m 3 /h, preferably 4.2-4.8 m 3 /h, and more preferably 4.5 m 3 /h; the flow rate of the hydrochloric acid waste gas is 200.0-350.0 m 3 /h, preferably 230.0-320.0 m 3 /h, and more preferably 280.0-300.0 m 3 /h.
进一步的，所述步骤(1)和步骤(3)中，自洽式吸收反应的温度独立的为25～35℃，优选为28～32℃，进一步优选为29～31℃；物料在自洽式吸收反应器中的停留时间独立的为60～90min，优选为75～85min，进一步优选为80min。Furthermore, in step (1) and step (3), the temperature of the self-consistent absorption reaction is independently 25 to 35°C, preferably 28 to 32°C, and more preferably 29 to 31°C; the residence time of the material in the self-consistent absorption reactor is independently 60 to 90 min, preferably 75 to 85 min, and more preferably 80 min.
进一步的，所述步骤(2)中，循环冷却器对吸收液降温至25～35℃，优选为22～28℃，进一步优选为24～26℃。Furthermore, in step (2), the circulating cooler cools the absorption liquid to 25-35°C, preferably 22-28°C, and more preferably 24-26°C.
本发明的技术方案中，能成功实现所述的含盐废水和含盐酸废气自洽式资源化处理方法是在所述的含盐废水和含盐酸废气自洽式资源化处理装置中进行的。 In the technical solution of the present invention, the self-consistent resource recovery treatment method for saline wastewater and hydrochloric acid waste gas can be successfully implemented in the self-consistent resource recovery treatment device for saline wastewater and hydrochloric acid waste gas.
本发明的又一技术方案中提供一种资源化制备得到的工业级盐及工业级盐酸，采用所述的含盐废水和含盐酸废气自洽式资源化处理方法制备得到的。Another technical solution of the present invention provides an industrial-grade salt and industrial-grade hydrochloric acid prepared by resource recovery, which are prepared by the self-consistent resource recovery treatment method of salt-containing wastewater and hydrochloric acid-containing waste gas.
所述制备得到的工业级盐中TOC小于5mg/L，工业级盐的纯度大于99.0％，进一步优选为大于等于99.3％，进一步优选为大于等于99.5％，进一步优选为大于等于99.8％。The TOC of the prepared industrial-grade salt is less than 5 mg/L, and the purity of the industrial-grade salt is greater than 99.0%, more preferably greater than or equal to 99.3%, more preferably greater than or equal to 99.5%, and more preferably greater than or equal to 99.8%.
所述制备得到的工业级盐酸满足合格品的要求，进一步优选为满足一等品的要求，进一步优选为满足优等品的要求。The industrial-grade hydrochloric acid prepared meets the requirements of qualified products, more preferably meets the requirements of first-class products, and further preferably meets the requirements of superior products.
在本发明的一些可实施的案例中，本发明的技术方案可以将医药原料药及中间体生产中副产的工业盐，如TOC达5000mg/L以上，用去离子水溶解成饱和溶液后与含盐酸废气进行自洽式资源化处理方法，采用本发明的方法可得到质量很高的精制工业盐，TOC小于5mg/L，品质满足GB/T5462-2015氯碱工业要求。In some feasible cases of the present invention, the technical scheme of the present invention can dissolve the industrial salt produced as a by-product in the production of pharmaceutical raw materials and intermediates, such as TOC of more than 5000 mg/L, into a saturated solution with deionized water and then conduct a self-consistent resource treatment method with hydrochloric acid-containing waste gas. The method of the present invention can obtain high-quality refined industrial salt with TOC less than 5 mg/L, and the quality meets the requirements of GB/T5462-2015 chlor-alkali industry.
本发明的有益效果：Beneficial effects of the present invention:
本发明的处理方法可将工业废水和工业废气进行同步反应得到工业级盐及工业盐酸；本发明将含盐废水和含盐酸废气同时通入自洽式吸收暨析出反应器中，进行自洽式吸收反应，根据同离子效应，含盐废水中的盐逐渐析出NaCl晶体，得到固液混合物，固液混合物经过沉降分离后即得到工业级盐及工业级盐酸，避免了所需设备占地多，也避免了内壁结垢多而阻塞出盐通道，且长时间易腐蚀管道，解决了现有技术中含盐废水与含盐酸废气单独处理易结垢，处理效率不高的问题。本发明的处理方法可将工业废水和工业废气进行同步反应得到工业级盐，得到的工业级盐可直接市售或用于氯碱工业，得到的盐酸可用作生产制冷剂CaCl2的原料；从而同时实现了资源化利用。The treatment method of the present invention can synchronously react industrial wastewater and industrial waste gas to obtain industrial-grade salt and industrial hydrochloric acid; the present invention simultaneously introduces saline wastewater and hydrochloric acid waste gas into a self-consistent absorption and precipitation reactor to perform a self-consistent absorption reaction, and according to the common ion effect, the salt in the saline wastewater gradually precipitates NaCl crystals to obtain a solid-liquid mixture, and the solid-liquid mixture is separated by sedimentation to obtain industrial-grade salt and industrial-grade hydrochloric acid, thereby avoiding the need for large equipment footprints, and also avoiding the need for a lot of scaling on the inner wall to block the salt outlet channel, and the long-term easy corrosion of the pipeline, thereby solving the problem of easy scaling and low treatment efficiency of saline wastewater and hydrochloric acid waste gas in the prior art. The treatment method of the present invention can synchronously react industrial wastewater and industrial waste gas to obtain industrial-grade salt, and the obtained industrial-grade salt can be directly sold on the market or used in the chlor-alkali industry, and the obtained hydrochloric acid can be used as a raw material for producing refrigerant CaCl2 ; thereby achieving resource utilization at the same time.
得到的工业级盐可直接市售或用于氯碱工业，得到的工业盐酸可用作制冷剂CaCl2的原料。本发明的处理方法不同于常规喷淋式吸收反应器的方法，不用塔板和填料，不会出现出盐堵塞反应器的问题。The obtained industrial-grade salt can be directly sold on the market or used in the chlor-alkali industry, and the obtained industrial hydrochloric acid can be used as a raw material for the refrigerant CaCl 2. The treatment method of the present invention is different from the conventional spray absorption reactor method, does not use tower plates and fillers, and will not cause the problem of salt clogging the reactor.
本发明的自洽式吸收反应器设有冷却强制循环泵及循环冷却器，能够大幅度降低吸收塔内部的温度，进行换热，吸收塔顶端设有文氏管，在吸收循环液流作用下连续抽吸含盐酸废气，保证吸收塔内部反应的正常进行，制取盐和工业盐酸。通过含盐酸废气中的HCl被废水完全吸收而生成盐酸，根据同离子效应，废水中的盐完全析出生成盐颗粒；由此，废水中的NaCl完全析出生成工业盐，废气中的HCl经吸收生成工业盐酸，进而实现其资源化利用，在处理废水和废气的同时实现废物利用，更节省成本，以实现含盐废水和含盐酸废气的资源 化。本发明的自洽式吸收反应器无需设置塔板，不需要填充填料，气液直接接触式反应，反应器内发生同离子效应，可析出盐。反应器中发生如下反应：The self-consistent absorption reactor of the present invention is provided with a cooling forced circulation pump and a circulating cooler, which can greatly reduce the temperature inside the absorption tower for heat exchange. A venturi is provided at the top of the absorption tower, which continuously draws the hydrochloric acid-containing waste gas under the action of the absorption circulating liquid flow, thereby ensuring the normal reaction inside the absorption tower to produce salt and industrial hydrochloric acid. The HCl in the hydrochloric acid-containing waste gas is completely absorbed by the wastewater to generate hydrochloric acid, and according to the common ion effect, the salt in the wastewater is completely precipitated to generate salt particles; thus, the NaCl in the wastewater is completely precipitated to generate industrial salt, and the HCl in the waste gas is absorbed to generate industrial hydrochloric acid, thereby realizing resource utilization, realizing waste utilization while treating wastewater and waste gas, and saving costs, so as to realize resource utilization of salt-containing wastewater and hydrochloric acid-containing waste gas. The self-consistent absorption reactor of the present invention does not need to be equipped with a tower plate or a filler, and the gas and liquid react in direct contact. A common ion effect occurs in the reactor, and salt can be precipitated. The following reactions occur in the reactor:
NaCl(液)+HCl(气)→NaCl(固、可市售)+HCl(液、可用作制备制冷剂CaCl2的原料)。NaCl (liquid) + HCl (gas) → NaCl (solid, commercially available) + HCl (liquid, can be used as a raw material for preparing the refrigerant CaCl 2 ).
本发明的技术方案中，自洽式吸收反应器在其特定、紧凑的结构下，所涉及文氏管吸收、层流富集、晶体有序生长、强制循环冷却、液固高效分离等过程，其物料平衡和热力学平衡的高效稳定控制，需要模型模拟计算和独特创新思维，不仅能够实现含盐废水和含盐酸废气的资源化处理，还能实现粗盐精制，得到的晶体盐纯度高，可以高效率工业化使用。In the technical solution of the present invention, the self-consistent absorption reactor, under its specific and compact structure, involves processes such as venturi absorption, laminar enrichment, orderly crystal growth, forced circulation cooling, and efficient liquid-solid separation. The efficient and stable control of its material balance and thermodynamic equilibrium requires model simulation calculations and unique innovative thinking. It can not only realize the resource treatment of saline wastewater and hydrochloric acid waste gas, but also realize the refining of crude salt. The obtained crystalline salt has high purity and can be used efficiently in industrial areas.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明自洽式吸收反应器的结构示意图，其中，1-吸收塔，2-循环冷却器，3-液位计，4-含固液位自动调节阀，5-除沫器，6-文氏管，7-挡板，8-吸收液循环泵，9-冷却强制循环泵，10-出料阀，11-挡环，12-废水进口，13-横向进气口，14-尾气出口。Figure 1 is a schematic diagram of the structure of the self-consistent absorption reactor of the present invention, wherein 1-absorption tower, 2-circulating cooler, 3-liquid level meter, 4-solid-liquid level automatic regulating valve, 5-demister, 6-Venturi tube, 7-baffle, 8-absorption liquid circulation pump, 9-cooling forced circulation pump, 10-discharge valve, 11-baffle ring, 12-wastewater inlet, 13-lateral air inlet, 14-exhaust gas outlet.
图2为实施例1得到的NaCl的晶体显微镜照片。FIG. 2 is a crystal microscope photograph of NaCl obtained in Example 1.
具体实施方式Detailed ways
本发明提供了一种含盐废水和含盐酸废气自洽式资源化处理方法，包括以下步骤：The present invention provides a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas, comprising the following steps:
1)将含盐废水和含盐酸废气同时通入自洽式吸收反应器中，进行自洽式吸收反应，得到吸收液；1) introducing salt-containing wastewater and hydrochloric acid-containing waste gas into a self-consistent absorption reactor at the same time to carry out a self-consistent absorption reaction to obtain an absorption liquid;
2)通过循环冷却器及冷却强制循环泵对吸收液进行降温，控制吸收液温度，以利于废气中HCl的吸收；2) Cooling the absorption liquid through a circulating cooler and a cooling forced circulation pump to control the temperature of the absorption liquid to facilitate the absorption of HCl in the exhaust gas;
3)所得吸收液通过吸收液循环泵继续与含盐酸废气进行自洽式吸收反应，析出固体，得到固液混合物，固液混合物经过沉降及离心分离后即得到工业级盐及工业级盐酸。3) The obtained absorption liquid continues to undergo a self-consistent absorption reaction with the hydrochloric acid-containing waste gas through an absorption liquid circulation pump, solids are precipitated, and a solid-liquid mixture is obtained. After sedimentation and centrifugal separation, the solid-liquid mixture is used to obtain industrial-grade salt and industrial-grade hydrochloric acid.
在本发明中，所述含盐废水中含有NaCl，所述含盐酸废气中含有HCl气体。In the present invention, the saline wastewater contains NaCl, and the hydrochloric acid waste gas contains HCl gas.
在本发明中，所述含盐废水的流量为4.0～5.0m3/h，优选为4.2～4.8m3/h，进一步优选为4.5m3/h；所述含盐酸废气的流量为200.0～350.0m3/h，优选为230.0～320.0m3/h，进一步优选为280.0～300.0m3/h。In the present invention, the flow rate of the saline wastewater is 4.0-5.0 m 3 /h, preferably 4.2-4.8 m 3 /h, more preferably 4.5 m 3 /h; the flow rate of the hydrochloric acid waste gas is 200.0-350.0 m 3 /h, preferably 230.0-320.0 m 3 /h, more preferably 280.0-300.0 m 3 /h.
在本发明中，所述步骤1)和步骤3)中，自洽式吸收反应的温度独立的为25～35℃，优选为28～32℃，进一步优选为29～31℃；物料在自洽式吸收反应器中的停留时间独立的为60～90min，优选为75～85min，进一步优选为80min。 In the present invention, in step 1) and step 3), the temperature of the self-consistent absorption reaction is independently 25-35°C, preferably 28-32°C, and more preferably 29-31°C; the residence time of the material in the self-consistent absorption reactor is independently 60-90min, preferably 75-85min, and more preferably 80min.
在本发明中，所述步骤2)中，循环冷却器对吸收液降温至25～35℃，优选为22～28℃，进一步优选为24～26℃。In the present invention, in step 2), the circulating cooler cools the absorption liquid to 25-35°C, preferably 22-28°C, and more preferably 24-26°C.
在本发明中，本发明的含盐废水和含盐酸废气自洽式资源化处理方法还可用于粗盐的精制。In the present invention, the self-consistent resource recovery method for treating saline wastewater and hydrochloric acid waste gas of the present invention can also be used for refining crude salt.
在本发明中，所述自洽式吸收反应器，包括吸收塔1、循环冷却器2以及冷却强制循环泵9，吸收塔1底端设有废水进口12，吸收塔1底端通过管道与循环冷却器2底端连接，循环冷却器2的顶端的管道延伸至吸收塔1的内部，循环冷却器2底端与吸收塔1连接的管道上设置有冷却强制循环泵9，循环冷却器2顶端设置有壳程进水口，底端设置有壳程出水口，从顶端进水从底端出水，与循环冷却器2内部的管程吸收液进行换热，予以降温，通过循环冷却器2以及冷却强制循环泵9对吸收液进行强化冷却，能够快速降低反应产生的温度。循环冷却器2设置有上进下出的冷却水进口及出口。In the present invention, the self-consistent absorption reactor comprises an absorption tower 1, a circulating cooler 2 and a cooling forced circulation pump 9, a wastewater inlet 12 is provided at the bottom of the absorption tower 1, the bottom of the absorption tower 1 is connected to the bottom of the circulating cooler 2 through a pipeline, the pipeline at the top of the circulating cooler 2 extends to the inside of the absorption tower 1, a cooling forced circulation pump 9 is provided on the pipeline connected to the absorption tower 1 at the bottom of the circulating cooler 2, a shell-side water inlet is provided at the top of the circulating cooler 2, and a shell-side water outlet is provided at the bottom, water enters from the top and exits from the bottom, heat is exchanged with the tube-side absorption liquid inside the circulating cooler 2, and the temperature is reduced, and the absorption liquid is intensively cooled by the circulating cooler 2 and the cooling forced circulation pump 9, which can quickly reduce the temperature generated by the reaction. The circulating cooler 2 is provided with a cooling water inlet and outlet that enter from the top and exit from the bottom.
在本发明中，吸收塔1的顶端设置有文氏管6，底端设置有进水口，文氏管6用于吸入含盐酸尾气，文氏管6底端设置有管状喇叭式喷头，文氏管6顶端设置有横向进气口13，文氏管6纵向进液口通过管道与吸收液循环泵8的一端相连通，吸收液循环泵8的另一端与吸收塔1内部相连通，进气口吸入有含盐酸废气。吸收塔1的顶端还设置有尾气出口14，该尾气出口的尾气去尾气吸收装置。In the present invention, a venturi 6 is provided at the top of the absorption tower 1, and a water inlet is provided at the bottom. The venturi 6 is used to inhale tail gas containing hydrochloric acid. A tubular trumpet nozzle is provided at the bottom of the venturi 6. A transverse air inlet 13 is provided at the top of the venturi 6. The longitudinal liquid inlet of the venturi 6 is connected to one end of an absorption liquid circulation pump 8 through a pipeline. The other end of the absorption liquid circulation pump 8 is connected to the inside of the absorption tower 1, and the air inlet inhales waste gas containing hydrochloric acid. A tail gas outlet 14 is also provided at the top of the absorption tower 1, and the tail gas at the tail gas outlet goes to the tail gas absorption device.
在本发明中，吸收塔1的顶端还设置有除沫器5，用于去除残余尾气中的液体泡沫。In the present invention, a demister 5 is further provided at the top of the absorption tower 1 for removing liquid foam in the residual tail gas.
在本发明中，循环冷却器2顶端延伸至吸收塔1内部管道的出口处设置有挡板7，通过挡板7将管道中的吸收液从湍流变为层流，以利于盐颗粒的沉降。In the present invention, a baffle 7 is provided at the outlet of the pipe extending from the top of the circulating cooler 2 to the inner pipe of the absorption tower 1, and the baffle 7 changes the absorption liquid in the pipe from turbulent flow to laminar flow, so as to facilitate the sedimentation of salt particles.
在本发明中，吸收塔1与吸收液循环泵8连通的位置处的内壁还设置有挡环11，用于隔开吸收反应区和析出沉降区，以确保吸收液循环泵8抽入的循环吸收液尽可能少地携带盐颗粒，以利于吸收液循环泵的正常运行，同时也有利于废气中HCl的吸收和盐颗粒的析出沉降。In the present invention, a retaining ring 11 is further provided on the inner wall of the absorption tower 1 at the position where it is connected to the absorption liquid circulation pump 8, which is used to separate the absorption reaction zone and the precipitation and sedimentation zone to ensure that the circulating absorption liquid drawn in by the absorption liquid circulation pump 8 carries as few salt particles as possible, so as to facilitate the normal operation of the absorption liquid circulation pump, and also facilitate the absorption of HCl in the exhaust gas and the precipitation and sedimentation of salt particles.
本申请的自洽式吸收反应器中设置有挡板7和挡环11，在挡板的下层由挡环围住的范围及吸收反应器下部锥体和细长“盐腿”部形成层流区域，有利于固体的沉降和富集，确保打循环的吸收液不含或尽可能少含固体颗粒，防止堵塞管道，提高液固分离效果。The self-consistent absorption reactor of the present application is provided with a baffle 7 and a baffle ring 11. The range enclosed by the baffle ring in the lower layer of the baffle and the lower cone and slender "salt leg" of the absorption reactor form a laminar flow area, which is conducive to the sedimentation and enrichment of solids, ensuring that the circulating absorption liquid contains no or as little solid particles as possible, preventing clogging of the pipeline and improving the liquid-solid separation effect.
在本发明中，吸收塔1的一侧安装有液位计3，通过液位计3来确定吸收塔1内部的液位。In the present invention, a liquid level meter 3 is installed on one side of the absorption tower 1 , and the liquid level inside the absorption tower 1 is determined by the liquid level meter 3 .
在本发明中，吸收塔1的底端还设置有管道与含固液位自动调节阀4连接，含固液位自动调节阀4底端设置有出料阀10，含固液位自动调节阀4与出料阀10连锁，含固液位自动 调节阀4用于控制吸收塔含固液位，出料阀10用于控制出料，去离心机出盐及工业盐酸。In the present invention, the bottom end of the absorption tower 1 is also provided with a pipeline connected to the solid-liquid level automatic regulating valve 4, and the bottom end of the solid-liquid level automatic regulating valve 4 is provided with a discharge valve 10, and the solid-liquid level automatic regulating valve 4 is interlocked with the discharge valve 10. The regulating valve 4 is used to control the solid-liquid level of the absorption tower, and the discharge valve 10 is used to control the discharge of salt and industrial hydrochloric acid to the centrifuge.
在本发明中，含盐废水从吸收塔1底端进入，文氏管6顶端设置的横向进气口处吸入含盐酸的废气，与吸收液循环泵8出来的吸收液经文氏管6强制进行气液混合后，进入吸收塔1内部，废水吸收废气中的HCl而生成盐酸，废水中的盐因同离子效应而逐渐乃至完全析出，盐颗粒以及工业盐酸沉降至吸收塔1底端并通过出料阀10排出，经过离心机将盐和工业盐酸分离开来；盐经分析质量达标后可做工业盐销售，工业盐酸可用作制备制冷剂CaCl2的原料。经过吸收HCl后的废气经除沫器5，进入其他废气处理装置，达标排放；吸收塔1内部的吸收液会受到冷却强制循环泵9的影响，从吸收塔1底端与循环冷却器2连接的管道处进入循环冷却器2内部，冷却后的吸收液从循环冷却器2的顶端管道进入吸收塔1内部，形成湍流，湍流经吸收塔1内部的挡板7阻挡，形成层流，从而缓解流体翻滚，有利于生成的盐颗粒沉降。In the present invention, saline wastewater enters from the bottom of the absorption tower 1, and waste gas containing hydrochloric acid is sucked into the lateral air inlet arranged at the top of the venturi tube 6. After being forcibly mixed with the absorption liquid from the absorption liquid circulation pump 8 through the venturi tube 6, it enters the absorption tower 1. The wastewater absorbs HCl in the waste gas to generate hydrochloric acid. The salt in the wastewater is gradually or even completely precipitated due to the common ion effect. The salt particles and industrial hydrochloric acid settle to the bottom of the absorption tower 1 and are discharged through the discharge valve 10. The salt and the industrial hydrochloric acid are separated by a centrifuge. The salt can be sold as industrial salt after the quality is analyzed and meets the standard, and the industrial hydrochloric acid can be used as a raw material for preparing the refrigerant CaCl2 . The waste gas after absorbing HCl passes through the demister 5 and enters other waste gas treatment devices to meet the emission standards; the absorption liquid inside the absorption tower 1 will be affected by the cooling forced circulation pump 9, and enter the circulation cooler 2 from the pipeline connected to the circulation cooler 2 at the bottom of the absorption tower 1. The cooled absorption liquid enters the absorption tower 1 from the top pipeline of the circulation cooler 2, forming turbulence. The turbulence is blocked by the baffle 7 inside the absorption tower 1 to form laminar flow, thereby alleviating the tumbling of the fluid and facilitating the precipitation of the generated salt particles.
下面结合实施例对本发明提供的技术方案进行详细的说明，但是不能把它们理解为对本发明保护范围的限定。The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.
实施例1Example 1
将含盐废水和含盐酸废气同时不断地通入自洽式吸收反应器中，含盐废水的通入流量为4.3m3/h，含盐酸废气的通入流量为260.0m3/h。The saline wastewater and the hydrochloric acid waste gas were continuously introduced into the self-consistent absorption reactor simultaneously. The flow rate of the saline wastewater was 4.3 m 3 /h, and the flow rate of the hydrochloric acid waste gas was 260.0 m 3 /h.
含盐废水和含盐酸废气在反应器中进行自洽式吸收反应，吸收反应停留65min，吸收塔内的吸收液通过循环冷却器进行降温，降低反应产生的温度，吸收液降温至25℃之后进一步通过吸收液循环泵与文氏管吸入的含盐酸废气进行自洽式吸收反应，在连续不断的吸收反应中，由于同离子效应，含盐废水中的盐逐渐析出NaCl晶体，经分析盐酸浓度31％时，NaCl晶体析出完全，得到的固液混合物去离心机分离后得到固体工业级盐和液体工业级盐酸。所得工业盐按国标GB/T5462-2015检测，各项指标均符合要求。本实施例中采用上述结构的自洽式吸收反应器，在气液混合区域形成层流区域，NaCl晶体有序生长，经过晶体有序生长过程，NaCl晶体透明，在结晶过程中没有包裹任何影响NaCl质量的杂质，实现了NaCl精制，可以用于氯碱工业，如图2所示，经过层流区域有序生长的NaCl晶体显微镜照片，粒度均匀、透明，没有包裹现象。液体工业级盐酸符合GB/T 320-2006中的优等品指标。The salt-containing wastewater and hydrochloric acid waste gas undergo a self-consistent absorption reaction in the reactor. The absorption reaction stays for 65 minutes. The absorption liquid in the absorption tower is cooled by a circulating cooler to reduce the temperature generated by the reaction. After the absorption liquid is cooled to 25°C, it is further self-consistently absorbed by the absorption liquid circulation pump and the hydrochloric acid waste gas sucked into the venturi. In the continuous absorption reaction, due to the common ion effect, the salt in the salt-containing wastewater gradually precipitates NaCl crystals. After analysis, when the hydrochloric acid concentration is 31%, the NaCl crystals are completely precipitated. The solid-liquid mixture is separated by a centrifuge to obtain solid industrial-grade salt and liquid industrial-grade hydrochloric acid. The obtained industrial salt is tested according to the national standard GB/T5462-2015, and all indicators meet the requirements. In this embodiment, a self-consistent absorption reactor with the above structure is used to form a laminar flow area in the gas-liquid mixing area, and NaCl crystals grow in an orderly manner. After the orderly growth process of the crystals, the NaCl crystals are transparent, and no impurities that affect the quality of NaCl are encapsulated during the crystallization process, thereby achieving NaCl refining, which can be used in the chlor-alkali industry. As shown in FIG2 , a microscope photo of NaCl crystals that have grown in an orderly manner in the laminar flow area shows uniform particle size, transparency, and no encapsulation. Liquid industrial-grade hydrochloric acid meets the superior product indicators in GB/T 320-2006.
实施例2Example 2
将含盐废水和含盐酸废气同时不断地通入自洽式吸收反应器中，含盐废水的通入流量为4.5m3/h，含盐酸废气的通入流量为290.0m3/h。 The saline wastewater and the hydrochloric acid waste gas were simultaneously and continuously introduced into the self-consistent absorption reactor. The flow rate of the saline wastewater was 4.5 m 3 /h, and the flow rate of the hydrochloric acid waste gas was 290.0 m 3 /h.
含盐废水和含盐酸废气在反应器中进行自洽式吸收反应，吸收反应停留75min，吸收塔内的吸收液通过循环冷却器进行降温，降低反应产生的温度，吸收液降温至28℃之后进一步通过吸收液循环泵与文氏管吸入的含盐酸废气进行自洽式吸收反应，在连续不断的吸收反应中，由于同离子效应，含盐废水中的盐逐渐析出NaCl晶体，经分析盐酸浓度30.5％时，NaCl晶体析出完全，得到的固液混合物去离心机分离后得到固体工业级盐和液体工业级盐酸。所得工业盐按国标GB/T5462-2015检测，各项指标均符合要求，得到的NaCl的晶体显微镜照片与实施例1基本相同，粒度均匀、透明，没有包裹现象。液体工业级盐酸符合GB/T 320-2006中的优等品指标。The salt-containing wastewater and the hydrochloric acid waste gas undergo a self-consistent absorption reaction in the reactor. The absorption reaction stays for 75 minutes. The absorption liquid in the absorption tower is cooled by a circulating cooler to reduce the temperature generated by the reaction. After the absorption liquid is cooled to 28°C, it is further subjected to a self-consistent absorption reaction with the hydrochloric acid waste gas sucked by the venturi tube through the absorption liquid circulation pump. In the continuous absorption reaction, due to the common ion effect, the salt in the salt-containing wastewater gradually precipitates NaCl crystals. After analysis, when the hydrochloric acid concentration is 30.5%, the NaCl crystals are completely precipitated. The obtained solid-liquid mixture is separated by a centrifuge to obtain solid industrial-grade salt and liquid industrial-grade hydrochloric acid. The obtained industrial salt is tested according to the national standard GB/T5462-2015, and all indicators meet the requirements. The crystal microscope photo of the obtained NaCl is basically the same as that of Example 1, with uniform and transparent particle size and no encapsulation phenomenon. The liquid industrial-grade hydrochloric acid meets the superior product indicators in GB/T 320-2006.
实施例3Example 3
将含盐废水和含盐酸废气同时不断地通入自洽式吸收反应器中，含盐废水的通入流量为5.0m3/h，含盐酸废气的通入流量为350m3/h。The saline wastewater and the hydrochloric acid waste gas are continuously introduced into the self-consistent absorption reactor simultaneously. The flow rate of the saline wastewater is 5.0 m 3 /h, and the flow rate of the hydrochloric acid waste gas is 350 m 3 /h.
含盐废水和含盐酸废气在反应器中进行自洽式吸收反应，吸收反应停留75min后，吸收塔内的吸收液通过循环冷却器进行降温，降低反应产生的温度，吸收液降温至33℃之后进一步通过吸收液循环泵与文氏管吸入的含盐酸废气进行自洽式吸收反应，在连续不断的吸收反应中，由于同离子效应，含盐废水中的盐逐渐析出NaCl晶体，经分析盐酸浓度31.5％时，NaCl晶体析出完全，最后得到的固液混合物去离心机分离后得到固体工业级盐和液体工业级盐酸。所得工业盐按国标GB/T5462-2015检测，各项指标均符合要求，得到的NaCl的晶体显微镜照片与实施例1基本相同，粒度均匀、透明，没有包裹现象。液体工业级盐酸符合GB/T 320-2006中的优等品指标。The salt-containing wastewater and the hydrochloric acid waste gas undergo a self-consistent absorption reaction in the reactor. After the absorption reaction stays for 75 minutes, the absorption liquid in the absorption tower is cooled by a circulating cooler to reduce the temperature generated by the reaction. After the absorption liquid is cooled to 33°C, it is further subjected to a self-consistent absorption reaction by the absorption liquid circulation pump and the hydrochloric acid waste gas sucked into the venturi. In the continuous absorption reaction, due to the common ion effect, the salt in the salt-containing wastewater gradually precipitates NaCl crystals. When the hydrochloric acid concentration is 31.5%, the NaCl crystals are completely precipitated. The solid-liquid mixture obtained is separated by a centrifuge to obtain solid industrial-grade salt and liquid industrial-grade hydrochloric acid. The obtained industrial salt is tested according to the national standard GB/T5462-2015, and all indicators meet the requirements. The crystal microscope photo of the obtained NaCl is basically the same as that of Example 1, with uniform and transparent particle size and no encapsulation. The liquid industrial-grade hydrochloric acid meets the superior product indicators in GB/T 320-2006.
对实施例1～3得到的工业级盐按国标GB/T5462-2015进行纯度检测，结果如下表1：The industrial-grade salt obtained in Examples 1 to 3 was tested for purity according to the national standard GB/T5462-2015. The results are shown in Table 1 below:
表1实施例1～3得到的工业级盐的纯度
Table 1 Purity of the industrial grade salt obtained in Examples 1 to 3
由以上实施例可知，本发明提供了一种含盐废水和含盐酸废气自洽式资源化处理方法。本发明的处理方法不仅将两种工业污染物进行自洽式反应，同时得到去除，而且生成了可工业使用的高纯度盐。本发明的自洽式吸收反应器不会产生出盐堵塞、腐蚀管道的问题，能够高效率连续处理含盐废水和含盐酸废气，反应后得到的工业盐酸可用于制备制冷剂CaCl2的 原料。本发明的处理方法简单易行，设备占地面积小，操作方便，可工业化处理含盐废水和含盐酸废气。As can be seen from the above embodiments, the present invention provides a self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas. The treatment method of the present invention not only conducts a self-consistent reaction on two industrial pollutants and removes them at the same time, but also generates high-purity salt that can be used in industry. The self-consistent absorption reactor of the present invention will not cause problems such as salt clogging and corrosion of pipelines, and can efficiently and continuously treat saline wastewater and hydrochloric acid waste gas. The industrial hydrochloric acid obtained after the reaction can be used to prepare the refrigerant CaCl2 The treatment method of the invention is simple and easy to implement, the equipment occupies a small area, and the operation is convenient, and it can industrially treat salt-containing wastewater and hydrochloric acid-containing waste gas.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，包括采用本发明精制有关粗盐，这些改进和润饰也应视为本发明的保护范围。 The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made, including using the present invention to refine the relevant crude salt. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims (15)

  1. 含盐废水和含盐酸废气自洽式资源化处理装置，其特征在于，自洽式吸收反应器包括吸收塔(1)、循环冷却器(2)以及冷却强制循环泵(9)，所述吸收塔(1)底端通过管道与所述循环冷却器(2)底端连接，所述循环冷却器(2)的顶端的管道延伸至吸收塔(1)的内部，所述循环冷却器(2)底端与吸收塔(1)连接的管道上设置有冷却强制循环泵(9)。A self-consistent resource recovery treatment device for salt-containing wastewater and hydrochloric acid waste gas, characterized in that the self-consistent absorption reactor comprises an absorption tower (1), a circulating cooler (2) and a cooling forced circulation pump (9), the bottom end of the absorption tower (1) is connected to the bottom end of the circulating cooler (2) through a pipeline, the pipeline at the top of the circulating cooler (2) extends to the interior of the absorption tower (1), and a cooling forced circulation pump (9) is provided on the pipeline connecting the bottom end of the circulating cooler (2) and the absorption tower (1).
  2. 根据权利要求1所述的含盐废水和含盐酸废气自洽式资源化处理装置，其特征在于，所述吸收塔(1)的顶端设置有文氏管(6)，所述吸收塔(1)底端设有废水进口(12)，所述文氏管(6)顶端设置有横向进气口(13)，所述文氏管(6)底端设置有管状喇叭式喷头，文氏管纵向进液口通过管道与吸收液循环泵(8)的一端相连通，吸收液循环泵(8)的另一端与吸收塔(1)内部相连通，进气口吸入有含盐酸废气。The self-consistent resource recovery treatment device for salt-containing wastewater and hydrochloric acid-containing waste gas according to claim 1 is characterized in that a venturi (6) is provided at the top of the absorption tower (1), a wastewater inlet (12) is provided at the bottom of the absorption tower (1), a transverse air inlet (13) is provided at the top of the venturi (6), a tubular trumpet-type nozzle is provided at the bottom of the venturi (6), the longitudinal liquid inlet of the venturi is connected to one end of the absorption liquid circulation pump (8) through a pipeline, the other end of the absorption liquid circulation pump (8) is connected to the inside of the absorption tower (1), and the air inlet sucks in hydrochloric acid-containing waste gas.
  3. 根据权利要求1所述的含盐废水和含盐酸废气自洽式资源化处理装置，其特征在于，所述吸收塔(1)的顶端还设置有除沫器(5)。The self-consistent resource recovery treatment device for saline wastewater and hydrochloric acid waste gas according to claim 1 is characterized in that a demister (5) is also provided at the top of the absorption tower (1).
  4. 根据权利要求1所述的含盐废水和含盐酸废气自洽式资源化处理装置，其特征在于，所述循环冷却器(2)顶端延伸至吸收塔(1)内部管道的出口处设置有挡板(7)。The self-consistent resource recovery treatment device for saline wastewater and hydrochloric acid waste gas according to claim 1 is characterized in that a baffle (7) is provided at the outlet of the internal pipe extending from the top of the circulating cooler (2) to the absorption tower (1).
  5. 根据权利要求1所述的含盐废水和含盐酸废气自洽式资源化处理装置，其特征在于，所述吸收塔(1)与吸收液循环泵(8)连通的位置处的内壁还设置有挡环(11)。The self-consistent resource recovery treatment device for saline wastewater and hydrochloric acid waste gas according to claim 1 is characterized in that a retaining ring (11) is further provided on the inner wall of the absorption tower (1) at the position where the absorption tower (1) is connected to the absorption liquid circulation pump (8).
  6. 根据权利要求1所述的含盐废水和含盐酸废气自洽式资源化处理装置，其特征在于，所述吸收塔(1)的一侧安装有液位计(3)。The self-consistent resource recovery treatment device for saline wastewater and hydrochloric acid waste gas according to claim 1 is characterized in that a liquid level meter (3) is installed on one side of the absorption tower (1).
  7. 根据权利要求1所述的含盐废水和含盐酸废气自洽式资源化处理装置，其特征在于，所述吸收塔(1)的底端还设置有管道与含固液位自动调节阀(4)连接，所述含固液位自动调节阀(4)底端设置有出料阀(10)，所述含固液位自动调节阀(4)与出料阀(10)连锁。The self-consistent resource recovery treatment device for saline wastewater and hydrochloric acid waste gas according to claim 1 is characterized in that a pipeline connected to an automatic solid-liquid level regulating valve (4) is further provided at the bottom end of the absorption tower (1), and a discharge valve (10) is provided at the bottom end of the automatic solid-liquid level regulating valve (4), and the automatic solid-liquid level regulating valve (4) is interlocked with the discharge valve (10).
  8. 一种含盐废水和含盐酸废气自洽式资源化处理方法，其特征在于，包括以下步骤：A self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas, characterized by comprising the following steps:
    (1)将含盐废水和含盐酸废气同时通入自洽式吸收反应器中，进行自洽式吸收反应，得到吸收液；(1) introducing salt-containing wastewater and hydrochloric acid-containing waste gas into a self-consistent absorption reactor at the same time to carry out a self-consistent absorption reaction to obtain an absorption liquid;
    (2)通过循环冷却器及冷却强制循环泵对吸收液进行降温，控制吸收液温度，以利于废气中HCl的吸收；(2) Cooling the absorption liquid by a circulating cooler and a cooling forced circulation pump to control the temperature of the absorption liquid to facilitate the absorption of HCl in the exhaust gas;
    (3)所得吸收液通过吸收液循环泵继续与含盐酸废气进行自洽式吸收反应，析出固体，得到固液混合物，固液混合物经过沉降及离心分离后即得到工业级盐及工业级盐酸。(3) The obtained absorption liquid continues to undergo a self-consistent absorption reaction with the hydrochloric acid-containing waste gas through an absorption liquid circulation pump, solids are precipitated, and a solid-liquid mixture is obtained. After sedimentation and centrifugal separation, the solid-liquid mixture is obtained to obtain industrial-grade salt and industrial-grade hydrochloric acid.
  9. 根据权利要求8所述的含盐废水和含盐酸废气自洽式资源化处理方法，其特征在于，所述含盐废水的流量为4.0～5.0m3/h，优选为4.2～4.8m3/h，进一步优选为4.5m3/h；所述含盐酸废气的流量为200.0～350.0m3/h，优选为230.0～320.0m3/h，进一步优选为280.0～300.0 m3/h。The self-consistent resource treatment method for saline wastewater and hydrochloric acid waste gas according to claim 8 is characterized in that the flow rate of the saline wastewater is 4.0 to 5.0 m3/h, preferably 4.2 to 4.8 m3/h, and more preferably 4.5 m3/h; the flow rate of the hydrochloric acid waste gas is 200.0 to 350.0 m3/h, preferably 230.0 to 320.0 m3/h, and more preferably 280.0 to 300.0 m3/h. m3/h.
  10. 根据权利要求9所述的含盐废水和含盐酸废气自洽式资源化处理方法，其特征在于，所述步骤(1)和步骤(3)中，自洽式吸收反应的温度独立的为25～35℃，优选为28～32℃，进一步优选为29～31℃；物料在自洽式吸收反应器中的停留时间独立的为60～90min，优选为75～85min，进一步优选为80min。The self-consistent resource recovery method for salt-containing wastewater and hydrochloric acid waste gas according to claim 9 is characterized in that in the steps (1) and (3), the temperature of the self-consistent absorption reaction is independently 25 to 35°C, preferably 28 to 32°C, and more preferably 29 to 31°C; the residence time of the material in the self-consistent absorption reactor is independently 60 to 90 min, preferably 75 to 85 min, and more preferably 80 min.
  11. 根据权利要求10所述的含盐废水和含盐酸废气自洽式资源化处理方法，其特征在于，所述步骤(2)中，循环冷却器对吸收液降温至25～35℃，优选为22～28℃，进一步优选为24～26℃。The self-consistent resource recovery method for salt-containing wastewater and hydrochloric acid waste gas according to claim 10 is characterized in that in the step (2), the circulating cooler cools the absorption liquid to 25 to 35°C, preferably 22 to 28°C, and more preferably 24 to 26°C.
  12. 根据权利要求8-11任一项所述的含盐废水和含盐酸废气自洽式资源化处理方法，其特征在于，所述的自洽式吸收反应器为权利要求1-7中任一项所述的含盐废水和含盐酸废气自洽式资源化处理装置。The self-consistent resource recovery treatment method for saline wastewater and hydrochloric acid waste gas according to any one of claims 8 to 11 is characterized in that the self-consistent absorption reactor is the self-consistent resource recovery treatment device for saline wastewater and hydrochloric acid waste gas according to any one of claims 1 to 7.
  13. 一种资源化制备得到的工业级盐及工业级盐酸，其特征在于，采用权利要求8-12中任一项所述的含盐废水和含盐酸废气自洽式资源化处理方法制备得到的。An industrial-grade salt and industrial-grade hydrochloric acid prepared by resource recovery, characterized in that they are prepared by the self-consistent resource recovery treatment method for salt-containing wastewater and hydrochloric acid-containing waste gas described in any one of claims 8 to 12.
  14. 根据权利要求13所述的资源化制备得到的工业级盐及工业级盐酸，其特征在于，所述制备得到的工业级盐中TOC小于5mg/L，工业级盐的纯度大于99.0％，进一步优选为大于等于99.3％，进一步优选为大于等于99.5％，进一步优选为大于等于99.8％。The industrial-grade salt and industrial-grade hydrochloric acid prepared by resource utilization according to claim 13, characterized in that the TOC in the prepared industrial-grade salt is less than 5 mg/L, and the purity of the industrial-grade salt is greater than 99.0%, more preferably greater than or equal to 99.3%, more preferably greater than or equal to 99.5%, and more preferably greater than or equal to 99.8%.
  15. 根据权利要求13所述的资源化制备得到的工业级盐及工业级盐酸，其特征在于，所述制备得到的工业级盐酸满足合格品的要求，进一步优选为满足一等品的要求，进一步优选为满足优等品的要求。 The industrial-grade salt and industrial-grade hydrochloric acid prepared by resource utilization according to claim 13, characterized in that the prepared industrial-grade hydrochloric acid meets the requirements of qualified products, more preferably meets the requirements of first-class products, and further preferably meets the requirements of superior products.
PCT/CN2023/102416 2022-10-08 2023-06-26 Self-consistent resourceful treatment apparatus and method for salt-containing wastewater and hydrochloric acid-containing waste gas WO2024074057A1 (en)

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