CN105505480A - Desulfurization purification system applicable to coke oven gas - Google Patents
Desulfurization purification system applicable to coke oven gas Download PDFInfo
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- CN105505480A CN105505480A CN201510978067.7A CN201510978067A CN105505480A CN 105505480 A CN105505480 A CN 105505480A CN 201510978067 A CN201510978067 A CN 201510978067A CN 105505480 A CN105505480 A CN 105505480A
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- Prior art keywords
- gas
- tower
- coke
- thionizer
- oven
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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
-
- 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
-
- 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
-
- 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
-
- 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
- C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
- C10K1/18—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids hydrocarbon oils
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Industrial Gases (AREA)
Abstract
The invention discloses a desulfurization purification system applicable to coke oven gas. The system is characterized in that a purification process system comprises a primary cooling tower, an electrical tar precipitator, a precooling tower, an ammonia removing device, a gas heat exchanger, a final cooling tower, a desulfurizing tower and a benzol washer which are connected sequentially, wherein the primary cooling tower is connected onto a coke oven gas pipe; a purified gas outlet is formed in the benzol washer; a regeneration tower for supplying a desulfurizing liquid to the desulfurizing tower is connected onto the desulfurizing tower. According to the system, the coke oven gas is subjected to cooling, tar removing, heat exchange and the like and then is sent to the desulfurizing tower, the desulfurizing liquid in the regeneration tower is sprayed in the desulfurizing tower to absorb acid gas such as H2S, HCN, CO2 and the like in gas entering the desulfurizing tower, purified gas is obtained after the gas is subjected to naphthalene removing in the benzol washer and can be directly used for urban civil use, metallurgical industry and the like, and the desulfurization degree is up to 98%.
Description
Technical field
The present invention is the desulfurizing and purifying system being applicable to coke-oven gas, is specifically related to the purification process technique of objectionable impurities in coke-oven gas, belongs to waste gas pollution control and treatment field.
Background technology
Coke-oven gas is the by product produced in process of coking, and China is coking big country, produces 320m by dry coal per ton
3coke-oven gas calculates, and the coke-oven gas of the annual discharge in the whole nation can reach more than 640 billion cubic meters.At present, coke-oven gas is widely used in fuel, the aspects such as industrial chemicals, we know, multiple gases component is contained without in the coke-oven gas of purification, especially containing tar, naphthalene, prussic acid, the organosulfur etc. of hydrogen sulfide and various structures complexity, when using for fuel, particularly coke-oven gas because of its calorific value high, CO content is low, be usually used in city civilian, because the sulphur in coking feed coal proceeds to coal gas mainly with the form of hydrogen sulfide, easily produce sulfurous gas in combustion, not only air is polluted, also larger toxic is had to human body, and to gas line, coal gas relevant device and combustion gas have serious corrosive nature, during for industrial chemicals, can act on iron and steel enterprise's refining steel, but the content of hydrogen sulfide in coke oven then can reduce steel product quality, therefore, coke-oven gas must carry out desulfurization process before use.
Example is treated to desulfurization, existing desulfuration processing method of coke oven gas mainly contains dry desulfurization and wet desulphurization two kinds, dry desulfurization is by the sweetening agent containing ironic hydroxide by coke-oven gas, ironic hydroxide and hydrogen sulfide are reacted and generates iron sulphide or Iron sulfuret, after saturated, sweetening agent is contacted with air, when there being moisture to exist, the sulphidic conversion of iron is become oxide compound by the oxygen in air, and desulfurizer regeneration uses continuously and is generally applicable to gas yield at the less coal chemical enterprise of below 8000/h scale; The doctor solution counter current contact of spraying with tower top after wet desulphurization refers to coal gas feeding thionizer, after hydrogen sulfide in coal gas is absorbed by absorbent solution, discharged by tower top, sweetening agent in absorption liquid and hydrogen sulfide reacting generating compound, sulfur removing pregnant solution contacts with air, oxidizing reaction occurs, and is desulfurization regeneration, the process that elemental sulfur is separated out.
On the basis of existing desulfurization wet processing, patent documentation CN101250440(wet desulfurization system and sulfur removal technology thereof, 2008-08-27) propose a kind of blocking that can effectively eliminate melt flow still that elemental sulfur causes and waste liquid tank, ensure the wet desulfurizing process of the normal running continuously of pipeline and each sweetener, operating environment and the intensity of wet desulfurization system can be alleviated.But along with the enhancing of industrial development and environmental protection consciousness; particularly metallurgical works; there has also been higher requirement to the sulphur content of the coke gas that the rolling of high quality steel uses, therefore, a kind of high-level efficiency, oligosaprobic purification process are the task of top priority processing coke gas at present.
Summary of the invention
The object of the present invention is to provide the desulfurizing and purifying system being applicable to coke-oven gas, in the present system, coke-oven gas delivers to thionizer after cooling, tar removing, heat exchange etc., and the doctor solution in regenerator column sprays in thionizer, to the H entered in the coal gas of thionizer
2s, HCN, CO
2absorb Deng sour gas, and then through washing benzene tower except after naphthalene, be purified coal gas, this purification coal gas can be directly used in the uses such as city is civilian, metallurgical industry, and desulfurization degree is up to 98%.
The present invention is achieved through the following technical solutions: the desulfurizing and purifying system being applicable to coke-oven gas, described purification process system comprises connected successively first cold tower, electrical tar precipitator, precooling tower, Ammonia removing machine, gas change heater, final cooling tower, thionizer and washes benzene tower, first cold tower is connected on coke-oven coal tracheae, be provided with purification gas exit washing on benzene tower, thionizer connects the regenerator column that promising thionizer provides doctor solution.
Coke-oven gas produces by process of coking, its temperature is higher, first cold tower adopts air to carry out heat exchange, first cold rear coke-oven gas temperature controls between 85 ~ 120 DEG C, electrical tar precipitator utilizes mechanize clarification or tar and ammonia water separation hopper two kinds of modes to be separated with coal gas by tar, temperature controls after 60 ~ 80 DEG C by precooling tower by coal gas, deliver to Ammonia removing machine except ammonia, again coal gas is sent into gas change heater and final cooling tower successively except after ammonia, temperature is finally down to less than 30 DEG C, and then send into thionizer, spray by the doctor solution from regenerator column the H removed in coal gas
2s, HCN, CO
2after sour gas, then deliver to and wash benzene tower except naphthalene, wash benzene tower and adopt oil wash naphthalene mode, utilize washing oil to wash coal gas and absorb naphthalene wherein, generally coal gas can be down to 0.5g/m containing naphthalene amount
3below, wash benzene tower and can obtain purification coal gas except after naphthalene, and deliver to user by purification gas exit.
This process system desulfuration efficiency is high, and the coal gas after purification reaches town gas standard, and coal gas is after thionizer, and hydrogen sulfide content can drop to 0.02g/m
3, prussic acid can drop to 0.1g/m
3.
In the present invention, the epimere of described thionizer is provided with NaOH washing section, and thionizer top is provided with and the gas exit washed benzene tower and be connected, and thionizer hypomere is provided with the gas entry be connected with final cooling tower, the doctor solution entrance be connected with regenerator column and rich solution and exports.
Coal gas sends into the hypomere of thionizer by gas entry, and the lean solution from regenerator column is sprayed to the hypomere of thionizer by doctor solution entrance, washs, remove the H in coal gas to the coal gas sent into
2s, HCN, CO
2deng sour gas, the coal gas after washing washes benzene tower through NaOH washing section with being delivered to by the gas exit at thionizer top after the NaOH solution washing of 5%; Washings delivers to regenerator column from rich solution outlet, and regenerator column regenerates washings, separates out sour gas H
2s, HCN, CO
2rear obtained lean solution, then deliver to by doctor solution entrance the desulfurization process that thionizer continues next round coal gas.
The present invention is reasonable in design, the pipeline that connection regenerator column and doctor solution entrance, regenerator column and rich solution export is connected with container for storing liquid, for when system overhaul, with pump, the feed liquid in thionizer and regenerator column is delivered to container for storing liquid, during driving, again the feed liquid in container for storing liquid is delivered to regenerator column, deliver to thionizer after regeneration and start desulfurization process.
Described Ammonia removing machine is the Spray Saturator being provided with the outlet of sulphur ammonium, in actual industrial process, Spray Saturator comes from sulphur ammonium production section, coal gas sends into the Spray Saturator of ammonium sulfate workshop section, spray with the circulating mother liquor containing free acid amount (sulfuric acid) 3.5 ~ 45% in Spray Saturator, circulating mother liquor forms sulphur ammonium after absorbing the ammonia in coal gas, through Spray Saturator except ammonia quantity in the coal gas after ammonia is generally less than 0.05g/m
3.
Gas blower is connected with between described electrical tar precipitator and precooling tower, coal gas after tar removing is sent into precooling tower by gas blower and is lowered the temperature, gas blower can reduce the temperature of coal gas on the one hand, the water content of coal gas can also be reduced on the other hand, can improve the purification efficiency of follow-up coal gas to a certain extent, practical effect is good.
For reducing environmental pollution, improve the purification efficiency of coke-oven gas, described regenerator column is provided with acid gas outlet, the outlet of this acid gas is connected with Cross unit, and the offgas outlet of Cross unit is connected with coke-oven coal tracheae, simultaneously, elemental sulfur in sour gas can also remove by Cross unit, for the production of sulphur, after sulphur recovery, can be used for the field such as medicine, chemical industry, enrich the diversity of derived product.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) the process system desulfuration efficiency that the present invention relates to is high, and the coal gas after purification can be directly used in the uses such as city is civilian, metallurgical industry, and after desulfurizing and purifying, hydrogen sulfide content can drop to 0.02g/m
3, prussic acid can drop to 0.1g/m
3.
(2) the present invention adopts the design of container for storing liquid, for when system overhaul, with pump, the feed liquid in thionizer and regenerator column is delivered to container for storing liquid, during driving, with pump, the feed liquid in container for storing liquid is delivered to regenerator column again, deliver to thionizer after regeneration and start desulfurization process, be convenient to maintenance and the system maintenance of equipment.
(3) coal gas after the present invention utilizes gas blower tar removing is sent into precooling tower and is lowered the temperature, gas blower can reduce the temperature of coal gas on the one hand, can also reduce the water content of coal gas on the other hand, can improve the purification efficiency of follow-up coal gas to a certain extent, practical effect is good.
(4) the present invention by regenerator column to washings resolve after recycle again, the sour gas parsed produces sulphur for reclaiming through Cross unit again, tail gas delivers to the process of coke-oven gas circularly purifying again, the secondary pollution of the environment avoided, and is suitable for extensively promoting the use of.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Wherein, 1-coke-oven coal tracheae, 2-purification gas exit, 3-NaOH washing section, 4-gas exit, 5-gas entry, 6-doctor solution entrance, 7-rich solution exports, and 8-sulphur ammonium exports, and 9-acid gas exports, 10-offgas outlet.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment:
Fig. 1 is the process flow sheet being applicable to the desulfurizing and purifying system of coke-oven gas that the present embodiment relates to, and is specifically summarized as follows:
This purification system is primarily of the first cold tower, electrical tar precipitator, precooling tower, Ammonia removing machine, gas change heater, final cooling tower, the thionizer that are connected successively and wash benzene tower composition, first cold tower is connected on coke-oven coal tracheae 1, benzene tower is provided with purification gas exit 2 washing, thionizer connects the regenerator column that promising thionizer provides doctor solution.As shown in Figure 1, the epimere of thionizer is provided with NaOH washing section 3, and thionizer top is provided with and the gas exit 4 washed benzene tower and be connected, and thionizer hypomere is provided with the gas entry 5 be connected with final cooling tower, the doctor solution entrance 6 be connected with regenerator column and rich solution and exports 7.
When practical application, first coke-oven gas delivers to just cold tower by coke-oven coal tracheae 1, through electrical tar precipitator tar removing, precooling tower delivers to Ammonia removing machine after being cooled to 60 ~ 80 DEG C, except the coal gas after ammonia sends into gas change heater and final cooling tower successively, gas temperature can be down to less than 30 DEG C, then thionizer hypomere is sent into by gas entry 5, because the doctor solution entrance 6 of thionizer is connected with regenerator column respectively with rich solution outlet 7, therefore, the coal gas sending into thionizer hypomere is washed by doctor solution, the washings formed exports 7 by rich solution again and delivers to regenerator column, after regenerator column regeneration, send into thionizer by doctor solution entrance 6 be again used as doctor solution use, send into the coal gas of thionizer hypomere after doctor solution washing, be stripped of the H in coal gas
2s, HCN, CO
2deng sour gas, and then through the NaOH washing section 3 of thionizer epimere, wash benzene tower with being delivered to by gas exit 4 after the NaOH solution washing of 5%, in the coal gas after thionizer, hydrogen sulfide content is down to 0.02g/m
3, prussic acid is down to 0.1g/m
3, gas change heater controls gas temperature to 40 ~ 50 DEG C, and wash benzene tower except the purification coal gas after naphthalene and deliver to user by purifying gas exit 2, the desulfurizing and purifying rate of system can reach 98%.
In above-mentioned application process, can replace as follows:
1) also container for storing liquid is connected with connecting on the pipeline that regenerator column and doctor solution entrance 6, regenerator column and rich solution export 7, as shown in Figure 1, before system overhaul, feed liquid in thionizer and regenerator column is delivered to container for storing liquid and is sealed up for safekeeping by available pump, after having overhauled, again by the feed liquid in container for storing liquid with being pumped to regenerator column, after system is driven, feed liquid is delivered to thionizer and is started desulfurization process after regeneration.In actual mechanical process, be convenient to system maintenance and overhaul of the equipments.
2) Ammonia removing machine adopts the Spray Saturator being provided with sulphur ammonium outlet 8, in actual industrial process, Spray Saturator comes from sulphur ammonium production section, coal gas sends into the Spray Saturator of ammonium sulfate workshop section, spray with the circulating mother liquor containing free acid amount (sulfuric acid) 3.5 ~ 45% in Spray Saturator, circulating mother liquor forms sulphur ammonium after absorbing the ammonia in coal gas, through Spray Saturator except ammonia quantity in the coal gas after ammonia is generally less than 0.05g/m
3.
3) between electrical tar precipitator and precooling tower, gas blower is connected with, coal gas after tar removing is sent into precooling tower by gas blower and is carried out cooling process, gas blower can reduce the temperature of coal gas on the one hand, the water content of coal gas can also be reduced on the other hand, can improve the subsequent purification efficiency of coal gas to a certain extent, practical effect is good.
4) be provided with Cross unit, the washings of regenerator column to thionizer regenerates, the sour gas H of precipitation
2s, HCN, CO
2send Deng by the acid gas outlet 9 on regenerator column, then through vacuum pumping to Cross unit, the offgas outlet 10 of this Cross unit is connected with coke-oven coal tracheae 1 again.When reality uses, elemental sulfur in sour gas can remove by Cross unit, for the production of sulphur, the field such as medicine, chemical industry is can be used for after sulphur recovery, deviate from the gas tail gas after elemental sulfur and deliver to coke-oven coal tracheae 1 by offgas outlet 10, the temperature of coke-oven gas can be reduced on the one hand, can purify tail gas at this on the other hand, reduce secondary pollution, improve the purification efficiency of coke-oven gas.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (6)
1. be applicable to the desulfurizing and purifying system of coke-oven gas, it is characterized in that: described purification process system comprises connected successively first cold tower, electrical tar precipitator, precooling tower, Ammonia removing machine, gas change heater, final cooling tower, thionizer and washes benzene tower, first cold tower is connected on coke-oven coal tracheae (1), benzene tower is provided with purification gas exit (2) washing, thionizer connects the regenerator column that promising thionizer provides doctor solution.
2. the purification process system of coke-oven gas according to claim 1, it is characterized in that: the epimere of described thionizer is provided with NaOH washing section (3), thionizer top is provided with and the gas exit (4) washed benzene tower and be connected, and thionizer hypomere is provided with the gas entry (5) be connected with final cooling tower, the doctor solution entrance (6) be connected with regenerator column and rich solution and exports (7).
3. the purification process system of coke-oven gas according to claim 2, is characterized in that: on the pipeline connecting regenerator column and doctor solution entrance (6), regenerator column and rich solution and export (7), be connected with container for storing liquid.
4. the purification process system of coke-oven gas according to claim 1, is characterized in that: described Ammonia removing machine is for being provided with the Spray Saturator of sulphur ammonium outlet (8).
5. the purification process system of coke-oven gas according to claim 1, is characterized in that: between described electrical tar precipitator and precooling tower, be connected with gas blower.
6. the purification process system of coke-oven gas according to claims 1 to 5, it is characterized in that: on described regenerator column, be provided with acid gas outlet (9), this acid gas outlet (9) is connected with Cross unit, and the offgas outlet (10) of Cross unit is connected with coke-oven coal tracheae (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510978067.7A CN105505480A (en) | 2015-12-23 | 2015-12-23 | Desulfurization purification system applicable to coke oven gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510978067.7A CN105505480A (en) | 2015-12-23 | 2015-12-23 | Desulfurization purification system applicable to coke oven gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763436A (en) * | 2017-11-30 | 2018-03-06 | 北京首钢国际工程技术有限公司 | A kind of coking desulfurization regenerator exhaust treatment system pipeline |
| CN111167286A (en) * | 2020-01-10 | 2020-05-19 | 安徽金禾实业股份有限公司 | Pressure swing adsorption decarbonization and vent gas desulfurization device and method |
| GB2593986A (en) * | 2020-04-09 | 2021-10-13 | Velocys Tech Ltd | Process |
| CN115261085A (en) * | 2022-08-01 | 2022-11-01 | 北京中冶和坤天冕工程技术有限公司 | Coke oven gas purification method |
| US11717812B2 (en) | 2020-10-13 | 2023-08-08 | Velocys Technologies Ltd | Catalyst |
-
2015
- 2015-12-23 CN CN201510978067.7A patent/CN105505480A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763436A (en) * | 2017-11-30 | 2018-03-06 | 北京首钢国际工程技术有限公司 | A kind of coking desulfurization regenerator exhaust treatment system pipeline |
| CN111167286A (en) * | 2020-01-10 | 2020-05-19 | 安徽金禾实业股份有限公司 | Pressure swing adsorption decarbonization and vent gas desulfurization device and method |
| GB2593986A (en) * | 2020-04-09 | 2021-10-13 | Velocys Tech Ltd | Process |
| GB2593939A (en) * | 2020-04-09 | 2021-10-13 | Velocys Tech Limited | Process |
| WO2021204708A1 (en) | 2020-04-09 | 2021-10-14 | Velocys Technologies Limited | Process for producing synthetic fuel |
| GB2593939B (en) * | 2020-04-09 | 2022-04-27 | Velocys Tech Limited | Manufacture of a synthetic fuel |
| GB2593986B (en) * | 2020-04-09 | 2023-02-15 | Velocys Tech Ltd | Manufacture of synthetic fuels |
| US11618860B2 (en) | 2020-04-09 | 2023-04-04 | Velocys Technologies Ltd. | Manufacture of a synthetic fuel |
| US11905478B2 (en) | 2020-04-09 | 2024-02-20 | Velocys Technologies Ltd. | Process for producing a synthetic fuel |
| US11717812B2 (en) | 2020-10-13 | 2023-08-08 | Velocys Technologies Ltd | Catalyst |
| CN115261085A (en) * | 2022-08-01 | 2022-11-01 | 北京中冶和坤天冕工程技术有限公司 | Coke oven gas purification method |
| CN115261085B (en) * | 2022-08-01 | 2023-09-01 | 北京中冶和坤天冕工程技术有限公司 | Coke oven gas purifying method |
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