CN111234883A - Coal gas double-tower washing and purifying system - Google Patents
Coal gas double-tower washing and purifying system Download PDFInfo
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- CN111234883A CN111234883A CN202010067222.0A CN202010067222A CN111234883A CN 111234883 A CN111234883 A CN 111234883A CN 202010067222 A CN202010067222 A CN 202010067222A CN 111234883 A CN111234883 A CN 111234883A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/101—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids with water only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/005—Carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/102—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids containing free acid
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
- C10K1/122—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors containing only carbonates, bicarbonates, hydroxides or oxides of alkali-metals (including Mg)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The invention discloses a coal gas double-tower washing and purifying system. The alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18. The double-tower washing and purifying system is adopted to carry out alkali washing and water washing on the coal gas in sequence, and the steel slag in the metallurgical industry is used for preparing alkali liquor to deeply absorb HCl, HF and H in the coal gas2S and other acidic gases can complete the dechlorination, defluorination and desulfurization of the coal gas and simultaneously remove the coal gas to a certain extentThe carbon dioxide in the coal gas is recovered to achieve the effects of saving energy and water.
Description
Technical Field
The invention belongs to the field of metallurgical energy, and particularly relates to a system for washing, purifying, dewatering, dedusting, desulfurizing and dechlorinating gas after TRT by a dry method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The raw gas directly discharged from the blast furnace has complex components and contains dust, CO and H2、N2、CO2Hydrocarbons, chlorine, sulfur, and the like. Wherein N is2And CO2The method is characterized in that the method is used for purifying and treating the waste gas, so that people are suffocated, CO is toxic, and chlorine, sulfur and the like cause corrosion and salt accumulation of equipment pipelines. Pipeline corrosion between gas chamber and the TRT verifies and the water seal displacement is very big, and coal gas dust content is higher, has following problem mainly:
①, corrosion of gas pipeline system, corrosion of chlorine ions to gas pipeline and corrosion of corrugated compensator, and corrosion part, where condensed water is separated out, especially the welded seam or structural change.
②, the chlorine ion has effect on the following user equipment, HCl gas can promote the silicate glass and cryptocrystalline aluminosilicate in the high alumina brick to be converted into mullite and cristobalite, which leads to the increase of porosity, and the HCl gas contacts with the refractory material in the hot blast furnace to promote the conversion of mineral phase in the refractory material and form new chemical substances, which destroys the original mineral structure, and when the temperature changes, the refractory material may crack, which shortens the service life of the refractory material of the blast furnace.
In recent years, with the popularization of a gas dry-type cloth bag dust removal technology, the content of chloride ions in gas is increased, and the corrosion phenomenon of a gas pipe network of a metallurgical enterprise is caused. The gas condensate water after dry dedusting is acidic, and gas leakage caused by corrosion of subsequent equipment pipelines causes the problems of shutdown and maintenance of users and the like. But a large pressure drop loss is generated on an adsorbent bed layer by a dry acid removal process technology, the pressure drop loss is about 10% of the inlet gas pressure, and the generation capacity per ton of iron is reduced by about 7%; although the coal gas passing through the wet alkali spraying tower system can be dechlorinated, the water vapor content is increased, and the calorific value of the coal gas is reduced.
Disclosure of Invention
In order to overcome the problems, the invention provides a coal gas double-tower washing and purifying system. The gas double-tower washing and purifying system provided by the invention can realize deep dechlorination of condensed water while deep dedusting is set for dechlorination and deacidification of gas, so that the influence of original chlorine ions and fluorine ions of the gas on subsequent user equipment can be eliminated by adopting the device provided by the invention, the calorific value of the gas is improved, and the energy consumption of iron per ton is reduced.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
This application has proposed a novel dewatering dust removal chlorine falls and has upgraded technique to gas development behind TRT, with the help of heat and humidity transfer itself preliminary solution coal gas area water dust-laden rich chlorine problem to supplementary with the high-efficient dechlorination of fixed bed dust removal reaction of absorbing water, realize the dry precipitation purification essence of dry process coal gas and handle, have important realistic meaning.
In some embodiments, the caustic tower 3 is connected to the TRT overbalance power plant 1 through a gas pipeline 2. Circulating alkali liquor and circulating water are used as a gas washing medium, the alkali liquor absorbs acid gas in the gas, and HCl, HF and CO in the gas are fully absorbed2、H2S and other acidic gases to realize the dechlorination, the defluorination, the decarbonization and the dust removal of the coal gas.
In some embodiments, the caustic tower 3 is provided with a caustic addition port 4 at the bottom. And absorbing acid gas in the coal gas by using alkali liquor.
In some embodiments, the first spray device 7 and the lye tank 5 are provided with a lye pump 6 by which lye circulates in the caustic tower and comes into contact with the gas by spraying.
In some embodiments, a waste liquor discharge pump 8 is provided between the lye tank 5 and the spent lye tank 9. The waste liquid formed by the dechlorination, defluorination and decarbonization reaction falls into an alkali liquid pool at the bottom of the alkali washing tower, and the waste liquid is pumped out of the alkali liquid pool to a waste alkali pool through a waste liquid discharge pump.
In some embodiments, a circulating water pump 13 is arranged between the circulating water tank 11 and the heat exchanger 14. Circulating water in the circulating water tank 11 is pumped out by a circulating water pump 13 and sent into a heat exchanger 14 to exchange heat with circulating cooling water 16, the circulating water from the heat exchanger 14 enters a spraying device 7 to be sprayed, and the circulating water is circularly sprayed and exchanged heat in a water washing tower 10.
In some embodiments, the heat exchanger is coupled to a cooling tower 17. The circulating cooling water 16 after heat exchange from the heat exchanger 14 enters the cooling tower 17 for air cooling and cooling, and the cooled circulating cooling water falls into a water pool at the bottom of the cooling tower 17 and is conveyed to the heat exchanger 14 through a circulating pump to continuously exchange heat with the circulating water in the water washing tower 10, so that continuous alkali washing, water washing and cooling processes of the coal gas are ensured to be continuously carried out.
In some embodiments, the gas outlet at the top of the water washing tower is connected with a user side, so that the operation effect and the economic benefit are improved.
In some embodiments, the material of the alkaline tower, the water scrubber, the spray device, the circulating pump or the demister is glass fiber reinforced plastic or stainless steel. The service life and the operation stability are improved.
In some embodiments, the gas inlets of the alkaline washing tower and the water washing tower are provided with flow deflectors.
The invention has the beneficial effects that:
(1) the invention utilizes the gas double-tower washing purification system alkali washing process, adopts circulating alkali liquor and circulating water as gas washing media, and the alkali liquor absorbs acid gas in the gas and fully absorbs HCl, HF and CO in the gas2、H2S and other acidic gases to realize the dechlorination, the defluorination, the decarbonization and the dust removal of the coal gas.
(2) Compared with the traditional single alkali washing process, the invention removes acid but not water, is additionally provided with the water washing tower, the coal gas is sprayed and contacted with a large amount of circulating water for heat exchange, the temperature of the coal gas is reduced to condense water vapor in the coal gas and deeply dissolve acid gases such as HCl, HF and the like, and the gaseous water in the coal gas is recovered, thereby having the remarkable advantages of deep dust removal, dechlorination and defluorination.
(3) The coal gas double-tower washing and purifying system can utilize steel slag discharged in the metallurgical industry to produce lime slurry to prepare alkali liquor, the fine steel slag components after magnetic separation and screening are mainly calcium oxide, and are soaked and washed by water to form the lime slurry which is used for alkali washing and acid removal of an alkali washing tower, so that the coal gas double-tower washing and purifying system has the effects of recycling resources and saving production cost.
(4) The operation method is simple, low in cost, universal and easy for large-scale production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of a gas double-tower scrubbing and purifying system in example 1 of the present invention.
The scores in the figure represent: 1-TRT (blast furnace top gas recovery turbine) residual pressure power generation device, 2-gas pipeline, 3-alkaline washing tower, 4-alkaline adding port, 5-alkaline solution pool, 6-circulating alkaline solution pump, 7-first spray device, 8-waste liquid discharge pump, 9-alkaline waste pool, 10-water washing tower, 11-circulating water pool, 12-process water inlet, 13-circulating water pump, 14-heat exchanger, 15-demister, 16-circulating cooling water, 17-cooling tower, 18-wastewater pool, 19-user end and 20-second spray device.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As mentioned above, the existing alkali washing acid removal and dry acid removal processes have the defect that the temperature cannot be reduced and the water cannot be removed, and meanwhile, the purchased alkali liquor or adsorbent needs high operation cost, and the heat value of the coal gas cannot be increased by only removing the acid. Therefore, the invention provides a coal gas double-tower washing and purifying system, which comprises: the system comprises a residual pressure power generation device, a gas pipeline, an alkaline tower, an alkaline adding port, an alkaline liquid pool, a circulating alkaline liquid pump, a spraying device, a waste liquid discharge pump, a waste alkaline pool, a washing tower, a circulating water pool, a process water inlet, a circulating water pump, a heat exchanger, a demister, circulating cooling water, a cooling tower, a waste water pool and a user side.
The alkaline tower is arranged behind the TRT (blast furnace top gas recovery turbine) residual pressure power generation device; the alkali adding port is arranged on the alkali washing tower, an alkali liquor pool is arranged at the bottom of the alkali washing tower, a coal gas outlet of the TRT excess pressure power generation device is connected with the alkali washing tower through a coal gas pipeline, and an alkali liquor circulating pump is respectively connected with the alkali liquor pool and the top of the alkali washing tower. The water washing tower is positioned behind the alkaline washing tower, a gas inlet of the water washing tower is connected with a gas outlet of the alkaline washing tower through a gas pipeline, a circulating water tank is arranged at the bottom of the water washing tower, and a circulating water pump is sequentially connected with a water tank at the bottom of the water washing tower, the heat exchanger and a spraying device at the top of the water washing tower. The bottom of the alkaline tower is provided with an alkaline solution pool, the top of the alkaline tower is provided with a spraying device, alkaline solution circulates in the alkaline tower through a circulating alkaline solution pump, and coal gas discharged from the TRT excess pressure power generation device enters the alkaline tower to contact with the alkaline solution. And the coal gas from the alkaline tower enters a water washing tower through a coal gas pipeline, a slurry tank is arranged at the bottom of the water washing tower, and a spraying device and a demister are arranged at the top of the water washing tower. Circulating water circulates in the water washing tower through a circulating water pump and contacts with coal gas for heat exchange, and the coal gas after water washing enters a demister for removing mechanical water carried in the coal gas and finally enters a user end.
The bottom of the alkaline washing tower is provided with an alkaline solution pool, an alkaline adding port and a process water inlet, the upper part of the alkaline washing tower is provided with a spraying device, fresh alkaline solution is supplemented into the system from the alkaline port, the alkaline solution circulates in the alkaline washing tower through a circulating alkaline solution pump, coal gas enters the lower part of the alkaline washing tower to be contacted with the alkaline solution sprayed at the upper part, HCl and HF gas in the coal gas are neutralized and absorbed by the alkaline solution and absorb part of CO2The gas and the coal gas are subjected to alkali washing dechlorination and defluorination in an alkali washing tower, and carbon dioxide is removed to a certain extent. The waste liquid formed by the dechlorination, defluorination and decarbonization reaction falls into an alkali liquid pool at the bottom of the alkali washing tower, and the waste liquid is pumped out of the alkali liquid pool to a waste alkali pool through a waste liquid discharge pump.
The bottom of the washing tower is provided with a slurry tank, the upper part of the washing tower is provided with a spray device and a demister, circulating water circulates in the washing tower through a circulating water pump, coal gas enters the lower part of the washing tower to contact with the circulating water sprayed on the upper part for heat exchange, and the temperature of the coal gas is reduced to condense water vapor in the coal gas. The water washing and the steam condensation process can deeply dissolve chlorine and remove dust, the washed coal gas enters a demister to remove mechanical water carried in the coal gas, and the coal gas is dechlorinated, decarbonized, defluorinated and dehydrated and the calorific value of the coal gas is improved. Along with the condensation of the water vapor in the coal gas and the dissolution of the acid gas, the slurry at the bottom of the washing tower is increased, so that a water outlet is formed in the slurry tank and is led out to the waste liquid tank through a pump.
The wastewater of the wastewater tank comes from an alkaline liquid tank at the bottom of the alkaline washing tower and a slurry tank at the bottom of the water washing tower, and part of alkaline liquid (water) needs to be discharged to the wastewater tank for treatment along with the washing process of circulating alkaline liquid (water) and coal gas.
As a further technical scheme, flow guide plates are arranged at air inlets of the alkaline washing tower and the water washing tower, and the flow guide plates can retain water and are used for flow guide.
As a further technical scheme, the upper part of the alkaline washing tower is provided with a nozzle, a spraying layer and a grid, so that the specific surface area of the atomized alkali liquor is greatly improved, and the contact reaction efficiency of the alkali liquor and the coal gas is obviously improved.
As a further technical scheme, the upper part of the water washing tower is provided with the nozzle, the spraying layer and the grating, so that the specific surface area is greatly improved after circulating water is atomized, and the chlorine dissolving efficiency of cooling condensed water in contact washing of the circulating water and coal gas is obviously improved. And a demister is arranged above the spraying layer of the water washing tower, the coal gas after alkali washing and water washing is saturated and carries mechanical water droplets, and the mechanical water carried in the coal gas is removed through demisting of the demister.
As a further technical scheme, the alkaline washing tower and the water washing tower are made of corrosion-resistant materials, such as glass fiber reinforced plastics, stainless steel and the like; the spray device on the upper part of the alkaline tower is made of corrosion-resistant materials and has certain self-cleaning capability, such as stainless steel or ceramics.
As a further technical solution, the gas double-tower washing and purifying system further comprises: water treatment system, alkali lye preparation system, acidizing fluid purification system. The water treatment system is used for treating wastewater formed by gas alkaline washing or water washing, and can be used for carrying out graded purification on each component. The alkali liquor preparation system comprises an alkali liquor preparation device, an alkali liquor mixer, a filter, an alkali liquor inlet and an alkali liquor pump, and fresh alkali liquor is conveyed to an alkali liquor adding port after being prepared. The acid liquor purification system is used for treating hydrochloric acid hydrofluoric acid wastewater formed after gas washing, and hydrochloric acid and hydrofluoric acid are produced after purification.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1
A gas double tower scrubbing purification system, referring to fig. 1, comprising: 1-TRT (blast furnace top gas recovery turbine) residual pressure power generation device, 2-gas pipeline, 3-alkaline washing tower, 4-alkaline adding port, 5-alkaline solution pool, 6-circulating alkaline solution pump, 7-spraying device, 8-waste liquid discharge pump, 9-waste alkaline pool, 10-water washing tower, 11-circulating water pool, 12-process water inlet, 13-circulating water pump, 14-heat exchanger, 15-demister, 16-circulating cooling water, 17-cooling tower, 18-waste water pool and 19-user end.
The bottom of the alkaline tower 3 is provided with an alkaline adding port 4 and an alkaline liquid pool 5, the upper part of the alkaline tower 3 is provided with a spraying device 7, alkaline liquid circulates in the alkaline tower 3 through a circulating alkaline liquid pump 6, coal gas enters the lower part of the alkaline tower 3 to be contacted with the alkaline liquid sprayed on the upper part, and CO in the coal gas2、HCl、HF、H2And (3) reacting the acidic gases such as S and the like with NaOH in the alkali liquor, and finishing alkali washing, dechlorinating, defluorination and desulfurization of the coal gas in an alkali washing tower 3 and removing carbon dioxide to a certain extent. NaCI, NaF and Na formed by dechlorination, defluorination and decarbonization reactions2CO3、Na2And S falls into an alkali liquor pool 5 at the bottom of the alkaline tower 3, and partial waste liquor is pumped out to a waste alkali pool 9 through a waste liquor discharge pump 8 for treatment.
The bottom of the water washing tower 10 is provided with a circulating water tank 11, the upper part of the water washing tower 10 is provided with a spraying device 7 and a demister 15, coal gas enters from the lower part of the water washing tower 10 to contact with circulating water sprayed from the upper part for heat exchange, the temperature of the coal gas is reduced to condense water vapor in the coal gas, and the circulating water after the coal gas is washed falls into the circulating water tank 11 at the bottom of the water washing tower 10. Circulating water in the circulating water tank 11 is pumped out by a circulating water pump 13 and sent into a heat exchanger 14 to exchange heat with circulating cooling water 16, the circulating water from the heat exchanger 14 enters a spraying device 7 to be sprayed, and the circulating water is circularly sprayed and exchanged heat in a water washing tower 10. The water washing and the steam condensation process can deeply dissolve chlorine and remove dust, the washed coal gas enters a demister 15 to remove mechanical water carried in the coal gas, and the coal gas is dechlorinated, decarbonized, defluorinated and dehydrated and the calorific value of the coal gas is improved. Along with the condensation of water vapor in the coal gas and the dissolution of acid gas, more and more slurry is generated at the bottom of the water washing tower 10, so that a water outlet is arranged below the circulating water tank 11 and is led out to a waste water tank 18 through a waste liquid discharge pump 8. The circulating cooling water 16 after heat exchange from the heat exchanger 14 enters the cooling tower 17 for air cooling and cooling, and the cooled circulating cooling water falls into a water pool at the bottom of the cooling tower 17 and is conveyed to the heat exchanger 14 through a circulating pump to continuously exchange heat with the circulating water in the water washing tower 10, so that continuous alkali washing, water washing and cooling processes of the coal gas are ensured to be continuously carried out.
Wastewater formed by gas alkali washing enters a wastewater tank 5 for treatment, and the wastewater contains NaCI and CaCl2And NaF, and each component can be subjected to fractional purification application. The wastewater tank 18 is used for treating high-concentration hydrochloric acid and hydrofluoric acid wastewater formed after gas washing, and producing hydrochloric acid and hydrofluoric acid after purification, and has high economic value.
Example 2
A gas double-tower washing and purifying system is the same as the embodiment 1, and is characterized in that: the coal gas double-tower washing and purifying system adopts steel slag to produce lime slurry, and utilizes the steel slag discharged by the metallurgical industry to produce the lime slurry to prepare alkali liquor. The fine steel slag component after magnetic separation and screening is mainly calcium oxide, is soaked and washed by water to form lime slurry, and the lime slurry is conveyed to an alkali liquor alkali adding port 4 to be used for alkali washing and acid removal of an alkali washing tower 3, so that the method has the remarkable advantages of recycling resources and saving production cost.
Ca (OH) in lye2Absorbing HCl and HF gases in the coal gas and absorbing part of CO2CO in gas, coal gas2、HCl、HF、H2S and other acidic gases react with Ca (OH)2 in the alkali liquor, and the gas is subjected to alkali washing, dechlorination, defluorination and desulfurization in an alkali washing tower 3 and is deprived of carbon dioxide to a certain extent. CaCl formed by dechlorination, defluorination and decarbonization reactions2、CaF2、CaCO3Falls into an alkali liquor pool 5 at the bottom of the alkaline tower 3, and the part of waste liquor is pumped out of the alkali liquor pool 5 to a waste alkali 9 pool irregularly.
The waste alkali tank 9 is used for treating waste water formed by gas alkali washing, and the waste water contains CaF which is difficult to dissolve in water2、CaCO3And CaCl which is readily soluble in water2Through which is passedFiltering and sieving to obtain CaF2、CaCO3And each component can be subjected to fractional purification application. The wastewater tank 18 is used for treating high-concentration hydrochloric acid and hydrofluoric acid wastewater formed after gas washing, and producing hydrochloric acid and hydrofluoric acid after purification, and has high economic value.
Example 3
A gas double-tower washing and purifying system is the same as the embodiment 1, and is characterized in that: the alkaline tower, the water tower, the spray device, the nozzle and the demister are made of corrosion-resistant materials, such as stainless steel, glass fiber reinforced plastic, plastics and the like; the spray device at the upper part of the evaporation concentration tower is made of corrosion-resistant materials and has certain self-cleaning capability.
Example 4
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
This application has proposed a novel dewatering dust removal chlorine falls and has upgraded technique to gas development behind TRT, with the help of heat and humidity transfer itself preliminary solution coal gas area water dust-laden rich chlorine problem to supplementary with the high-efficient dechlorination of fixed bed dust removal reaction of absorbing water, realize the dry precipitation purification essence of dry process coal gas and handle, have important realistic meaning.
Example 5
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
The alkaline tower 3 is connected with the TRT (blast furnace top gas recovery turbine) excess pressure power generation device 1 through a gas pipeline 2. Circulating alkali liquor and circulating water are used as a gas washing medium, the alkali liquor absorbs acid gas in the gas, and HCl, HF and CO in the gas are fully absorbed2、H2S and other acidic gases to realize the dechlorination, the defluorination, the decarbonization and the dust removal of the coal gas.
Example 6
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
And an alkali adding port 4 is formed at the bottom of the alkali washing tower 3. And absorbing acid gas in the coal gas by using alkali liquor.
Example 7
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
The first spraying device 7 and the alkaline solution pool 5 are provided with alkaline solution pumps 6, and alkaline solution circulates in the alkaline tower through circulating alkaline solution pumps and contacts with coal gas through spraying.
Example 8
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
And a waste liquid discharge pump 8 is arranged between the alkali liquid pool 5 and the waste alkali pool 9. The waste liquid formed by the dechlorination, defluorination and decarbonization reaction falls into an alkali liquid pool at the bottom of the alkali washing tower, and the waste liquid is pumped out of the alkali liquid pool to a waste alkali pool through a waste liquid discharge pump.
Example 9
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
And a circulating water pump 13 is arranged between the circulating water tank 11 and the heat exchanger 14. Circulating water in the circulating water tank 11 is pumped out by a circulating water pump 13 and sent into a heat exchanger 14 to exchange heat with circulating cooling water 16, the circulating water from the heat exchanger 14 enters a spraying device 7 to be sprayed, and the circulating water is circularly sprayed and exchanged heat in a water washing tower 10.
Example 10
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
The heat exchanger is connected to a cooling tower 17. The circulating cooling water 16 after heat exchange from the heat exchanger 14 enters the cooling tower 17 for air cooling and cooling, and the cooled circulating cooling water falls into a water pool at the bottom of the cooling tower 17 and is conveyed to the heat exchanger 14 through a circulating pump to continuously exchange heat with the circulating water in the water washing tower 10, so that continuous alkali washing, water washing and cooling processes of the coal gas are ensured to be continuously carried out.
Example 11
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
And a coal gas outlet at the top of the water washing tower is connected with a user side, so that the operation effect and the economic benefit are improved.
Example 12
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
The alkaline tower, the water scrubber, the spray device, the circulating pump or the demister are made of glass fiber reinforced plastic or stainless steel. The service life and the operation stability are improved.
Example 13
A gas double tower scrubbing purification system comprising: an alkaline washing tower 3, a water washing tower 10 and a heat exchanger 14; the alkaline washing tower 3 and the water washing tower 10 are connected, a first spraying device 7 is arranged on the upper portion of the alkaline washing tower 3, an alkaline liquor pool 5 is arranged at the bottom of the alkaline washing tower 3, the first spraying device 7 is connected with the alkaline liquor pool 5, the alkaline liquor pool 5 is connected with a waste alkaline pool 9, a second spraying device 20 and a demister 15 are arranged on the upper portion of the water washing tower 10, a circulating water pool 11 is arranged at the bottom of the water washing tower 10, a heat exchanger 14 is arranged between the circulating water pool 11 and the second spraying device 20, and the circulating water pool 11 is further connected with a waste water pool 18.
And the gas inlets of the alkaline tower 3 and the water scrubber 10 are provided with guide plates.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A coal gas double-tower washing and purifying system is characterized by comprising: an alkaline washing tower (3), a water washing tower (10) and a heat exchanger (14); the alkaline washing tower (3) and the water washing tower (10) are connected, a first spraying device (7) is arranged on the upper portion of the alkaline washing tower (3), an alkaline liquor pool (5) is arranged at the bottom of the alkaline washing tower (3), the first spraying device (7) is connected with the alkaline liquor pool (5), the alkaline liquor pool (5) is connected with a waste alkaline pool (9), a second spraying device (20) and a demister (15) are arranged on the upper portion of the water washing tower (10), a circulating water pool (11) is arranged at the bottom of the water washing tower (10), a heat exchanger (14) is arranged between the circulating water pool (11) and the second spraying device (20), and the circulating water pool (11) is further connected with a wastewater pool (18).
2. The gas double tower washing and purifying system according to claim 1, wherein the caustic tower (3) is connected with the TRT excess pressure power generation device (1) through a gas pipeline (2).
3. The gas double tower washing and purifying system according to claim 1, wherein the bottom of the alkaline washing tower (3) is provided with an alkaline adding port (4).
4. The gas double tower scrubbing and purification system according to claim 1, wherein said first spray means (7) and said lye tank (5) are provided with lye pumps (6).
5. The gas double tower scrubbing purification system of claim 1, wherein a spent liquor drain pump (8) is disposed between said caustic bath (5) and spent caustic bath (9).
6. The gas double-tower scrubbing and purifying system according to claim 1, wherein a circulating water pump (13) is disposed between said circulating water tank (11) and said heat exchanger (14).
7. The gas double tower scrubbing purification system of claim 1, wherein said heat exchanger is connected to a cooling tower (17).
8. The gas double-tower scrubbing purification system of claim 1, wherein said gas outlet at the top of said water scrubber is connected to a user terminal.
9. The gas double-tower washing and purifying system as claimed in claim 1, wherein the alkali washing tower, the water washing tower, the spraying device, the circulating pump or the demister is made of glass fiber reinforced plastic or stainless steel.
10. The gas double tower washing and purifying system as claimed in claim 1, wherein a deflector is provided at the gas inlet of the alkaline washing tower and the water washing tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010067222.0A CN111234883A (en) | 2020-01-20 | 2020-01-20 | Coal gas double-tower washing and purifying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010067222.0A CN111234883A (en) | 2020-01-20 | 2020-01-20 | Coal gas double-tower washing and purifying system |
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| CN111234883A true CN111234883A (en) | 2020-06-05 |
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| CN202010067222.0A Pending CN111234883A (en) | 2020-01-20 | 2020-01-20 | Coal gas double-tower washing and purifying system |
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| CN112961711A (en) * | 2021-02-08 | 2021-06-15 | 赛鼎工程有限公司 | System and method for preparing LNG (liquefied Natural gas) and coproducing methanol, liquid ammonia and hydrogen through coke oven gas purification |
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