CN114931849B - Split type sulphur carbon is wet process desorption device in coordination - Google Patents

Split type sulphur carbon is wet process desorption device in coordination Download PDF

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Publication number
CN114931849B
CN114931849B CN202210649940.8A CN202210649940A CN114931849B CN 114931849 B CN114931849 B CN 114931849B CN 202210649940 A CN202210649940 A CN 202210649940A CN 114931849 B CN114931849 B CN 114931849B
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tower
absorption
section
absorption liquid
pretreatment
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CN114931849A (en
Inventor
刘含笑
罗水源
赵琳
崔盈
周号
斯洪良
寿恬雨
王帅
刘美玲
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Zhejiang Feida Environmental Science and Technology Co Ltd
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Zhejiang Feida Environmental Science and Technology Co Ltd
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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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06—Spray cleaning
    • 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
    • B01D53/62—Carbon oxides
    • 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
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention provides a split sulfur-carbon synergistic wet removal device, which comprises a pretreatment section and SO 2 Absorbent recycling section, CO 2 Absorption section, CO 2 The analysis section is provided with a pretreatment tower, and the SO 2 The absorbent recycling section is provided with SO 2 Absorption tower, SO 2 Resolving and absorbent regenerating device and demisting tower, the CO 2 The absorption section is provided with CO 2 An absorption tower, the pretreatment tower and SO 2 Absorption tower, CO 2 The absorption tower and the demisting tower are sequentially arranged along the flue gas treatment direction, and the SO 2 The absorption tower is provided with a circulating spraying system, and the SO 2 An absorption liquid outlet of the absorption tower is connected into the demisting tower and SO 2 Analysis and absorbent regeneration device, the CO 2 The absorption liquid outlet of the absorption tower is connected with CO 2 Analysis section, CO 2 Adsorption of saturated absorption liquid into CO 2 And (5) regenerating and recycling the absorption liquid after the analysis in the analysis section. The device can realize the sulfur and carbon co-removal, occupies small area, has low cost and is more suitable for large-scale engineering popularization.

Description

Split type sulphur carbon is wet process desorption device in coordination
[ field of technology ]
The invention relates to the technical field of pollutant treatment, in particular to a split sulfur-carbon synergistic wet method removal device.
[ background Art ]
With the rapid development of the economy and society in China, the problems of energy and environment are increasingly highlighted. The energy pattern of China mainly using coal does not change greatly in a quite long period of time, and the flue gas generated by the coal-fired power plant contains various gaseous or solid pollutants such as SO 2 、NO x And particulate matter PM10 or PM2.5 having a particle diameter of less than 20 μm or 2.5 μm, etc., although CO 2 Treatment objects which have not been included in atmospheric pollutants, but are increasingly concerned due to their greenhouse effect, and power plants are the largest CO 2 One of the emissions sources is fixed. The existing cooperative removal equipment mostly adopts a mode of wet desulfurization, pretreatment and carbon capture, has complex process, high cost and large occupied area, and provides a split type sulfur-carbon cooperative wet removal device.
[ invention ]
The invention aims to solve the problems in the prior art, and provides a split type sulfur-carbon synergistic wet method removal device which can realize the synergistic removal of sulfur and carbon, and is small in occupied area, low in cost and more suitable for large-scale engineering popularization.
In order to achieve the aim, the invention provides a split sulfur-carbon synergistic wet method removing device, which comprises a pretreatment section and SO 2 Absorbent recycling section, CO 2 Absorption section, CO 2 The analysis section is provided with a pretreatment tower, and the SO 2 The absorbent recycling section is provided with SO 2 Absorption tower, SO 2 Resolving and absorbent regenerating device and demisting tower, the CO 2 The absorption section is provided with CO 2 An absorption tower, the pretreatment tower and SO 2 Absorption tower, CO 2 The absorption tower and the demisting tower are sequentially arranged along the flue gas treatment direction, and the SO 2 The absorption tower is provided with a circulating spraying system, and the SO 2 An absorption liquid outlet of the absorption tower is connected into the demisting tower and SO 2 Analysis and absorbent regeneration device, the CO 2 The absorption liquid outlet of the absorption tower is connected with CO 2 Analysis section, CO 2 Adsorption of saturated absorption liquid into CO 2 And (5) regenerating and recycling the absorption liquid after the analysis in the analysis section.
Preferably, the SO 2 The absorbent recycling section also comprises a first heat exchanger, a second delivery pump and a second heater, wherein the output end of the second delivery pump and SO 2 The absorption liquid outlet of the absorption tower is connected, the output end of the second conveying pump is divided into two paths, one path of output end is connected with the demisting tower after being connected with the first heat exchanger and the second heater, and the other path of output end is connected with SO 2 An analysis and absorbent regeneration device.
Preferably, the SO 2 Saturated absorption liquid output from the absorption tower passes through the SO 2 Resolving and recycling the SO by a resolving and absorbent regenerating device 2 Unsaturated absorption liquid output by the absorption tower passes through the first heat exchanger and the second heater and then is connected into the demisting tower, and the PH of the saturated absorption liquid is not more than 4.
Preferably, the SO 2 The absorbent recycling section further comprises a third conveying pump, a first heater and a water supplementing system connected with the demisting tower, wherein the input end of the third conveying pump is connected with the bottom of the demisting tower, and the output end of the third conveying pump is connected with the first heat exchanger and the first heater and then connected with the inlet of the circulating spraying system.
Preferably, the pretreatment section further comprises an alkali liquor spraying device and an alkali liquor recovery device, the alkali liquor spraying device is provided with a liquor supply box, the alkali liquor spraying device is used for pre-spraying alkali liquor in the pretreatment tower, the input end of the alkali liquor recovery device is connected with an absorption liquor outlet of the pretreatment tower, and the output end of the alkali liquor recovery device is connected with the alkali liquor spraying device.
Preferably, the alkali liquor recovery device comprises a first delivery pump, a flowmeter and a first recovery box provided with an alkali adding device, wherein the input end of the first recovery box is connected with the absorption liquid outlet of the pretreatment tower, and the output end of the first recovery box is connected with the alkali liquor spraying device through the first delivery pump and the flowmeter.
Preferably, the CO 2 The analysis section is provided with CO 2 A resolving tower for resolving CO 2 The absorption liquid of the absorption tower is connected with the second heat exchanger and then is connected with CO 2 The analytical towers are connected.
The invention has the beneficial effects that: the invention can economically and efficiently realize the integrated removal of sulfur and carbon and SO 2 And CO 2 The removal efficiency of the method can reach 99 percent and 90 percent respectively, and compared with the prior conventional complex process WFGD+CCUS, the method has compact arrangement, and the pretreatment device is arranged at SO 2 Before the absorption tower, the general ph value ranges of the sulfur-carbon absorption liquid system are respectively 4.5-7 and 7-9, the occupied area is small, and the sulfur-carbon absorption liquid system is more suitable for large-scale engineering popularization. The device is suitable for medium-high sulfur coal, the integrated removal system is difficult to ensure enough alkali liquor injection quantity, and when high sulfur coal is combusted and SO is generated 2 Concentration exceeds 5000mg/m 3 When in use, the split system can ensure SO 2 The absorption liquid of the absorption tower has enough spraying quantity and flue gas residence time, so that the synergistic removal efficiency can be ensured.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of a split sulfur-carbon synergistic wet removal device.
[ detailed description ] of the invention
Referring to FIG. 1, the invention relates to a split sulfur-carbon synergistic wet removal device, which comprises a pretreatment section 1 and SO 2 Absorbent recycling section 2, CO 2 Absorption section 3, CO 2 A resolving section 4, wherein the pretreatment section 1 is provided with a pretreatment tower 11, and the SO 2 The absorbent recycling section 2 is provided with SO 2 Absorption tower 21, SO 2 A desorbent and absorbent regeneration device 22 and a demister column 24, the CO 2 The absorption section 3 is provided with CO 2 An absorption tower 31, a pretreatment tower 11, SO 2 Absorption tower 21, CO 2 The absorption tower 31 and the demisting tower 24 are sequentially arranged along the flue gas treatment direction, and the SO 2 The absorption tower 21 is provided with a circulating spray system, and the SO 2 The absorption liquid outlet of the absorption tower 21 is connected to the defogging tower 24 and SO 2 A resolving and absorbent regeneration device 22, whichCO 2 The absorption liquid outlet of the absorption tower 31 is connected with CO 2 Analysis section 4, CO 2 Adsorption of saturated absorption liquid into CO 2 And (5) regenerating and recycling the absorption liquid after the analysis in the analysis section 4.
Further, the SO 2 The absorbent recycling section 2 also comprises a first heat exchanger 23, a second delivery pump 26 and a second heater 29, wherein the output end of the second delivery pump 26 is connected with SO 2 The absorption liquid outlet of the absorption tower 21 is connected, the output end of the second delivery pump 26 is divided into two paths, one path of output end is connected with the demisting tower 24 after being connected with the first heat exchanger 23 and the second heater 29, and the other path of output end is connected with SO 2 A desorption and absorbent regeneration device 22, which is the SO 2 The saturated absorption liquid outputted from the absorption tower 21 is passed through the SO 2 The desorption and absorbent regeneration device 22 is used for desorption and reuse, and the SO 2 The unsaturated absorption liquid output by the absorption tower 21 passes through the first heat exchanger 23 and the second heater 29 and then is connected into the demisting tower 24, and the PH of the saturated absorption liquid is not more than 4.
Still further, the SO 2 The absorbent recycling section 2 further comprises a third conveying pump 27, a first heater 28 and a water supplementing system 25 connected with the demisting tower 24, wherein the input end of the third conveying pump 27 is connected with the bottom of the demisting tower 24, and the output end of the third conveying pump 27 is connected with the first heat exchanger 23 and the first heater 28 and then connected with the inlet of the circulating spraying system.
Further, the pretreatment section 1 further comprises an alkali liquor spraying device and an alkali liquor recovery device, the alkali liquor spraying device is provided with a liquor supply box, the alkali liquor spraying device is used for pre-spraying alkali liquor in the pretreatment tower 11, the input end of the alkali liquor recovery device is connected with an absorption liquor outlet of the pretreatment tower 11, and the output end of the alkali liquor recovery device is connected with the alkali liquor spraying device. In this embodiment, the alkali liquor recovery device includes a first delivery pump 12, a flow meter 13, and a first recovery tank equipped with an alkali adding device, where an input end of the first recovery tank is connected to an absorption liquid outlet of the pretreatment tower 11, and an output end of the first recovery tank is connected to the alkali liquor spraying device through the first delivery pump 12 and the flow meter 13.
Further, the CO 2 ParseSection 4 is provided with CO 2 A desorption column 41 for CO 2 The absorption liquid of the absorption tower 31 is connected with the second heat exchanger 32 and then is connected with CO 2 The analytical column 41 is connected. CO 2 The absorption is exothermic and a PH meter and a flow divider are arranged in front of the second heat exchanger 32, when CO 2 When the PH of the absorption liquid in the absorption tower 31 is higher than 7, the diversion device cools the absorption liquid through the second heat exchanger 32 and returns the absorption liquid to CO 2 The absorption tower 31 is repeatedly sprayed; when the PH of the absorption liquid is lower than 7, the absorption liquid is input into CO by the flow dividing device 2 The resolved lean liquid enters the CO after being cooled by the second heat exchanger 32 in the resolving tower 41 2 The absorption tower 31 sprays.
In the present embodiment, the CO 2 The analysis section 4 also comprises an absorption liquid purifying device (arranged on the CO 2 The top end of the analytical column 41), a heating system 42, a compression purification device 43, CO 2 The desorption tower 41 is provided with a heating system and an absorption liquid purifying device, and rich liquid enters CO 2 After the desorption tower 41, the rich liquid is heated by a heating system 42 using steam as a heating medium to decompose CO 2 CO containing impurities after analysis 2 Preparation of industrial or food grade CO by cold drying and impurity removal and then entering a compression purification device 43 2 。
The working process of the invention comprises the following steps:
the alkali circulating liquid spraying device of the pretreatment section 1 pre-sprays alkali liquid in the pretreatment tower 11 and has SO (sulfur dioxide) function 2 And the dust removing function, the absorption liquid is recycled, and after the PH is lower than 3, the absorption liquid is subjected to alkali adding tempering through an alkali adding device and is recycled.
The pretreated flue gas enters SO 2 Absorber recycling section 2 desulphurizes, SO 2 The absorbent recycling section 2 contains inorganic ammonia SO 2 Absorption tower 21, saturated absorption liquid (pH is not more than 4) is subjected to SO 2 The resolving and absorbent regenerating device 22 resolves, recycles or directly prepares chemical fertilizer, the absorption liquid with PH more than 4 is connected into the demisting tower 24, the absorption liquid of the demisting tower 24 enters the circulating spraying system to SO after passing through the first heat exchanger 23 and the first heater 28 2 The absorption tower 21 is sprayed circularly.
The flue gas after desulfurization enters CO 2 The absorption section 3 is internally provided with organic ammonia CO 2 Absorber 31, cleaning of aerosol particles containing absorbentThe flue gas enters a demisting tower 24 for purification and then is emptied, and the collected ammonium salt aerosol enters SO along with the bottom liquid through a third conveying pump 27 2 The absorption tower 21 reacts; CO 2 Absorbing saturated absorption liquid into CO 2 The analysis tower 41 is used for regenerating and recycling the absorption liquid after analysis, and the absorption liquid is subjected to heating analysis and CO 2 Concentrating and purifying to obtain CO with concentration of 99.9% or higher 2 And (5) a product.
The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.

Claims (4)

1. A split sulfur-carbon cooperative wet method removing device is characterized in that: comprises a pretreatment section (1) and SO 2 Absorbent recycling section (2) and CO 2 Absorption section (3), CO 2 An analysis section (4), wherein the pretreatment section (1) is provided with a pretreatment tower (11), and the SO 2 The absorbent recycling section (2) is provided with SO 2 Absorption tower (21), SO 2 A desorption and absorbent regeneration device (22) and a demister column (24), the CO 2 The absorption section (3) is provided with CO 2 An absorption tower (31), the pretreatment tower (11), SO 2 Absorption tower (21), CO 2 The absorption tower (31) and the demisting tower (24) are sequentially arranged along the flue gas treatment direction, and the SO 2 The absorption tower (21) is provided with a circulating spray system, and the SO 2 An absorption liquid outlet of the absorption tower (21) is connected with a defogging tower (24) and SO 2 A desorption and absorbent regeneration device (22), the CO 2 An absorption liquid outlet of the absorption tower (31) is connected with CO 2 Analysis section (4) for converting CO 2 Adsorption of saturated absorption liquid into CO 2 The absorption liquid is regenerated and reused after the analysis in the analysis section (4); the SO 2 The absorbent recycling section (2) also comprises a first heat exchanger (23), a second delivery pump (26) and a second heater (29), wherein the output end of the second delivery pump (26) and SO 2 The absorption liquid outlet of the absorption tower (21) is connected, the output end of the second delivery pump (26) is divided into two paths, and one path of output end is connected with the first heat exchanger (23) and the second heater (29)Is connected with a demisting tower (24), and the other output end is connected with SO 2 An analysis and absorbent regeneration device (22); the SO 2 The saturated absorption liquid outputted from the absorption tower (21) passes through the SO 2 The SO is resolved and recycled by a resolving and absorbing agent regenerating device (22) 2 Unsaturated absorption liquid output by the absorption tower (21) passes through a first heat exchanger (23) and a second heater (29) and then is connected into a defogging tower (24), and the PH of the saturated absorption liquid is not more than 4; the SO 2 The absorbent recycling section (2) further comprises a third conveying pump (27), a first heater (28) and a water supplementing system (25) connected with the demisting tower (24), wherein the input end of the third conveying pump (27) is connected with the bottom of the demisting tower (24), and the output end of the third conveying pump (27) is connected with the first heat exchanger (23) and the first heater (28) and then connected with the inlet of the circulating spraying system.
2. The split sulfur-carbon synergistic wet removal device as claimed in claim 1, wherein: the pretreatment section (1) further comprises an alkali liquor spraying device and an alkali liquor recovery device, the alkali liquor spraying device is provided with a liquid supply box, the alkali liquor spraying device is used for pre-spraying alkali liquor in the pretreatment tower (11), the input end of the alkali liquor recovery device is connected with an absorption liquid outlet of the pretreatment tower (11), and the output end of the alkali liquor recovery device is connected with the alkali liquor spraying device.
3. The split sulfur-carbon synergistic wet removal device as claimed in claim 2, wherein: the alkali liquor recovery device comprises a first conveying pump (12), a flowmeter (13) and a first recovery box provided with an alkali adding device, wherein the input end of the first recovery box is connected with an absorption liquid outlet of the pretreatment tower (11), and the output end of the first recovery box is connected into the alkali liquor spraying device through the first conveying pump (12) and the flowmeter (13).
4. The split sulfur-carbon synergistic wet removal device as claimed in claim 1, wherein: the CO 2 The analysis section (4) is provided with CO 2 A desorption tower (41), the CO 2 The absorption liquid of the absorption tower (31) is connected with the second heat exchanger (32) and then is connected with CO 2 The analysis tower (41) is connected.
CN202210649940.8A 2022-06-09 2022-06-09 Split type sulphur carbon is wet process desorption device in coordination Active CN114931849B (en)

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CN102671531A (en) * 2012-05-18 2012-09-19 华北电力大学（保定） Method and device for absorbing fume pollutants by using ammonia water as absorbent
CN103203174A (en) * 2013-03-27 2013-07-17 华北电力大学（保定） Method for collecting SO2 and CO2 in flue gas from coal-fired power plant and producing chemical products
CN112221331A (en) * 2020-07-31 2021-01-15 扬州海通电子科技有限公司 SO that two-stage series connection multistage sprayed2Tail gas recovery and purification device and method thereof

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