阅读说明：本技术 一种能实现高炉煤气全硫脱除的湿法反应器 (Wet reactor capable of realizing total sulfur removal of blast furnace gas ) 是由 李鹏飞 朱晓华 朱迎新 刘瑱 王博如 程正霖 于 2020-08-03 设计创作，主要内容包括：本发明涉及一种能实现高炉煤气全硫脱除的湿法反应器,所述反应器中采用三层喷入的方式实现吸收液与煤气充分接触,提高物料利用率和硫脱除率。脱硫废液通过循环水泵直接返回反应器,提高碱液利用率。反应器下方设置水封装置(31),防止煤气泄漏,保证安全运行。运行过程中根据水封液位调整喷淋水量,根据出口H<Sub>2</Sub>S浓度调整喷碱量,根据脱硫废液密度调整排液量,把催化水解塔出口的高炉煤气直接引入反应器,实现了高炉煤气中含硫物质的脱除,从源头解决SO<Sub>2</Sub>超标问题,同时HCl的协同脱除在一定程度上控制了煤气管道腐蚀问题。(The invention relates to a wet reactor capable of realizing total sulfur removal of blast furnace gas, wherein a three-layer spraying mode is adopted in the reactor to realize full contact of absorption liquid and the gas, so that the material utilization rate and the sulfur removal rate are improved. The desulfurization waste liquid directly returns to the reactor through a circulating water pump, so that the utilization rate of the alkali liquor is improved. A water seal device (31) is arranged below the reactor to prevent gas leakage and ensure safe operation. The spraying water quantity is adjusted according to the water seal liquid level in the operation process and according to the outlet H 2 Adjusting the concentration of S, adjusting the alkali spraying amount according to the density of the desulfurization waste liquid, directly introducing the blast furnace gas at the outlet of the catalytic hydrolysis tower into a reactor, realizing the removal of sulfur-containing substances in the blast furnace gas, and solving the problem of SO from the source 2 The problem of exceeding standard is solved, and meanwhile, the corrosion problem of the gas pipeline is controlled to a certain extent by the synergistic removal of HCl.)

1. The wet reactor for removing the total sulfur from blast furnace gas is preferably one for removing the hydrogen sulfide (H) from blast furnace gas₂S), sulfur dioxide (SO)₂) A wet reactor for the removal of iso-sulphur species and for the synergistic removal of hydrogen chloride (HCl), characterized in that the wet reactor comprises a shell (7); a water seal device (31), an air flow uniform device (2), a circulating water spray device (4), an alkali liquor spray device (6), a demister (8) and a washing water spray device (10) are sequentially arranged in the shell (7) from bottom to top; the blast furnace gas inlet (1) is connected with the outer side surface of the shell (7), is positioned between the water seal device (31) and the airflow homogenizing device (2), and is usedIntroducing blast furnace gas into the shell (7); the blast furnace gas outlet (11) is arranged at the top end of the shell (7) and is positioned above the flushing water spraying device (10); a waste liquid outlet (16), a circulating water outlet (15), a circulating water inlet (14), an alkali liquor inlet (13) and a washing water inlet (12) are sequentially arranged on the side surface of the shell (7) from bottom to top; the circulating water outlet (15) is arranged above the water sealing device (31), and the waste liquid outlet (16) is arranged at the lower part of the water sealing device (31); the flushing water spray device (10) is connected with a process water tank (23) through a flushing water inlet (12) and is used for supplying water from the process water tank (23); the alkali liquor spraying device (6) is connected with an alkali liquor storage tank (24) through an alkali liquor inlet (13) and is used for supplying an absorbent from the alkali liquor storage tank (24); the circulating water outlet (15) is connected with the circulating water inlet (14) and is used for directly returning part of waste liquid at the bottom of the shell (7) to the reactor through the circulating water inlet (14) and the circulating water spraying device (4) so as to participate in the reaction process again.

2. A wet reactor according to claim 1, characterized in that the waste liquid discharge (16) is connected to a waste water treatment system by a liquid discharge pump (22), periodically discharging the waste liquid at the bottom of the shell (7).

3. A wet reactor according to one of claims 1-2, characterized in that the shell (7) comprises a large lower shell and a small upper shell, the small upper shell being located in the upper part of the large lower shell, the demister (8) and the flushing water spray (10) being arranged inside the small upper shell, the flushing water inlet (12) being arranged on the side of the small upper shell; the blast furnace gas outlet (11) is arranged at the top end of the upper small shell.

4. A wet process reactor according to one of claims 1 to 3, characterized in that the gas flow homogenizing device (2) is located above the blast furnace gas inlet (1), the gas homogenizing device (2) having a plurality of gas grids, adjacent two gas grids being angularly offset from each other.

5. A wet process reactor according to one of claims 1 to 4, characterized in that the demister (8) is a PP wire mesh demister, which is internally filled with a Phi 38mm pall ring packing.

6. Wet reactor according to one of claims 1 to 5, characterized in that the water seal (31) is provided with a density meter and a liquid level monitor, and the bottom of the housing (7) is provided with an emergency water outlet (17).

7. The wet process reactor according to one of claims 1 to 6, wherein the top of the shell (7) is provided with a blast furnace gas outlet (11) which is connected with a blow-off valve (25) and a dehydrator (18) in sequence, the dehydrator (18) is a high-efficiency cyclone plate dehydrator, and the mechanical water content of the gas at the outlet of the dehydrator can reach 7g/Nm³The following.

8. A wet process reactor according to any one of claims 1 to 7, characterized in that the circulating water spray means (4), the lye spray means (6) and the rinsing water spray means (10) each comprise a plurality of spray manifolds arranged radially along the cross-section of the reactor, on which spray manifolds a plurality of nozzles are arranged, ensuring that the full spray coverage of the nozzles covers the entire cross-section, with the spray direction all downwards. The nozzle type is preferably a solid cone nozzle.

9. A wet process reactor according to any one of claims 1 to 8, characterized in that a circulating water spray device (4) is installed above the blast furnace gas inlet (1) to form a first water spray layer, a lye spray device (6) is installed above the first water spray layer to form a second alkali spray layer, a demister (8) is installed above the second alkali spray layer, and a flushing water spray device (10) is installed above the demister (8) to form a third water flush layer. Preferably, a water supply pump (19) and a washing water valve (30) are arranged on a pipeline of the washing water inlet (12) connected with the process water tank (23); wherein the flushing water valve (30) is arranged between the flushing water inlet (12) and the water supply pump (19). Preferably, a pipeline for connecting the alkali liquor inlet (13) with the alkali liquor storage tank (24) is provided with an alkali liquor pipeline cut-off valve (27) and an alkali liquor pump (20), wherein the alkali liquor pipeline cut-off valve (27) is arranged between the alkali liquor inlet (13) and the alkali liquor pump (20). Preferably, the circulating water outlet (15) is connected with the circulating water inlet (14) through a circulating water pump (21); the pipeline that circulating water entry (14) was connected in circulating water export (15) still is provided with circulating water pipeline trip valve (29), and wherein, circulating water pipeline trip valve (29) are installed between circulating water entry (14) and circulating water pump (21). Preferably, a bypass is led out from a pipeline between the flushing water valve (30) and the water feeding pump (19), the bypass is provided with an alkali liquor bypass and a circulating water bypass, and the alkali liquor bypass is connected to an alkali liquor pipeline cut-off valve (27) through an alkali liquor pipeline bypass valve (26) and then used for flushing a nozzle of the alkali liquor spraying device (6) by using water in the process water tank (23); the circulating water bypass is connected with a circulating water pipeline stop valve (29) through a circulating water pipeline bypass valve (28) and then used for flushing a nozzle of the circulating water spraying device (4) by using water in the process water tank (23).

10. A method for operating a wet reactor according to any one of claims 1 to 9, characterized in that it comprises the following steps:

(1) in the initial stage of equipment operation, firstly, a washing water valve (30) and an alkali liquor pipeline cut-off valve (27) are opened, a water feed pump (19) and an alkali liquor pump (20) are started to inject water and main absorbent into the whole reactor through a washing water spraying device (10) and an alkali liquor spraying device (6), the water feed pump (19) and the washing water valve (30) are closed after the operation is stable, and water in a process water tank (23) does not enter the reactor through the washing water spraying device (10); opening a circulating water pipeline cut-off valve (29), starting a circulating water pump (21) and directly returning part of waste liquid at the bottom of the shell (7) to the reactor through a circulating water inlet (14) and a circulating water spraying device (4) so as to participate in the reaction process again;

(2) when the system normally operates, the alkali liquor pipeline cut-off valve (27) and the circulating water pipeline cut-off valve (29) are normally opened, the flushing water valve (30), the alkali liquor pipeline bypass valve (26) and the circulating water pipeline bypass valve (28) are normally closed, and the alkali liquor spraying device (6) is communicated with the alkali liquor storage tank (24) through an alkali liquor inlet (13) and used for supplying an absorbent from the alkali liquor storage tank (24) and adjusting the flow of the alkali liquor according to the sulfur concentration in the gas at the outlet of the desulfurizing tower; the circulating water outlet (15) is connected with the circulating water inlet (14) through a circulating water pump (21), and part of waste liquid directly returns to the reactor to participate in the reaction process again, so that the utilization rate of alkali liquor is improved; when the system needs water supplement or the demister (8) needs cleaning, a washing water valve (30) is opened, and water in the process water tank (23) enters the reactor through a washing water spraying device (10); when the nozzle of the alkali liquor spraying device (6) needs to be washed, closing the alkali liquor pipeline cut-off valve (27), opening the alkali liquor pipeline bypass valve (26), and washing the nozzle of the alkali liquor spraying device (6) by using water in the process water tank (23); when the nozzles of the circulating water spray device (4) need to be washed, the circulating water pipeline stop valve (29) is closed, and the circulating water pipeline bypass valve (28) is opened, so that the nozzles of the circulating water spray device (4) are washed by water in the process water tank (23).

Technical Field

The invention relates to a wet reactor capable of realizing total sulfur removal of blast furnace gas, in particular to a wet reactor capable of realizing H in blast furnace gas₂S、SO₂A wet reactor for removing sulfur-containing substances and removing HCl in a synergic manner, belonging to the pollutant control technology in the technical field of environmental protection engineering.

Background

The blast furnace gas is used as the combustible gas with the maximum output of the steel enterprises, and the statistical output is up to 700-. The existing blast furnace gas purification and subsequent application mainly adopts bag type dust removal to remove particulate matters, and the particulate matters are sent to user units such as a blast furnace hot blast stove, a steel rolling heating furnace, gas power generation and the like to be used as fuels after TRT residual pressure power generation, but the blast furnace gas still contains harmful substances such as sulfur, chlorine and the like. With the promulgation of the opinion about the promotion of the ultra-low emission in the steel industry, the steel industry formally enters the 'ultra-low emission' era, and users of blast furnace hot blast stoves, steel rolling heating furnaces, gas power generation and the like all require the burning of tail gas SO₂The ultra-low emission limit is reached, and the prior blast furnace gas purification process can not meet the requirement of SO₂And (5) controlling the requirements.

The current technical route mainly comprises source control and tail end treatment after combustion, if a tail end treatment mode is adopted, desulfurization facilities need to be arranged at multiple points, and meanwhile, the waste gas amount after gas combustion is large, and the scale of treatment facilities is enlarged; if a source control mode is adopted, centralized treatment can be realized, and the treated gas amount is only about 60% of the flue gas amount after combustion, so that the total investment is low, the total occupied area is small, the operation cost is low, and the management is convenient. Meanwhile, the source management promotes the service life and the combustion efficiency of the pipe network. The method implements the total sulfur removal of the blast furnace gas, reduces the sulfur content in the gas, can greatly reduce the pressure of the tail end treatment, and even saves tail end treatment facilities.

Blast furnace gas total sulfur removal is a new technical development direction, at present, a single organic sulfur hydrolysis technology and a dry adsorption removal technology are more, and a blast furnace gas dechlorination technology has related application examples, but no reports or engineering cases of the blast furnace gas total sulfur removal technology exist, so the blast furnace gas total sulfur removal technology still belongs to a front-edge exploration stage.

Disclosure of Invention

The invention aims to provide a wet reactor capable of realizing total sulfur removal of blast furnace gas, preferably a wet reactor capable of realizing H in blast furnace gas₂S、SO₂And the removal of sulfur-containing substances and the synergistic removal of HCl in the wet reactor, so as to solve the technical problems.

In order to solve the technical problems, the invention provides a wet reactor capable of realizing total sulfur removal of blast furnace gas, preferably a wet reactor capable of realizing total sulfur removal of blast furnace gas, namely a wet reactor capable of realizing hydrogen sulfide (H) in blast furnace gas₂S), sulfur dioxide (SO)₂) A wet reactor for the removal of sulfur-containing substances and the synergistic removal of hydrogen chloride (HCl), the wet reactor comprising a shell (7); a water seal device (31), an air flow uniform device (2), a circulating water spray device (4), an alkali liquor spray device (6), a demister (8) and a washing water spray device (10) are sequentially arranged in the shell (7) from bottom to top; the blast furnace gas inlet (1) is connected with the outer side surface of the shell (7), is positioned between the water seal device (31) and the airflow homogenizing device (2), and is used for introducing blast furnace gas into the shell (7); the blast furnace gas outlet (11) is arranged at the top end of the shell (7) and is positioned above the flushing water spraying device (10); a waste liquid outlet (16), a circulating water outlet (15), a circulating water inlet (14), an alkali liquor inlet (13) and a washing water inlet (12) are sequentially arranged on the side surface of the shell (7) from bottom to top; the circulating water outlet (15) is arranged above the water sealing device (31), and the waste liquid outlet (16) is arranged at the lower part of the water sealing device (31); the flushing water spray device (10) is connected with a process water tank (23) through a flushing water inlet (12) and is used for supplying water from the process water tank (23); the alkali liquor spraying device (6) is connected with an alkali liquor storage tank (24) through an alkali liquor inlet (13) and is used for supplying an absorbent from the alkali liquor storage tank (24); the circulating water outlet (15) is connected with the circulating water inlet (14) through a circulating water pump (21) and used for connecting the shell(7) Part of waste liquid at the bottom is directly returned to the reactor through a circulating water inlet (14) and a circulating water spraying device (4) to participate in the reaction process again.

Wherein the waste liquid discharge port (16) is connected to a waste water treatment system through a liquid discharge pump (22), and the waste liquid at the bottom of the shell (7) is discharged periodically.

The shell (7) comprises a large lower shell and a small upper shell, the small upper shell is positioned at the upper part of the large lower shell, a demister (8) and a washing water spraying device (10) are arranged inside the small upper shell, and a washing water inlet (12) is arranged on the side surface of the small upper shell; the blast furnace gas outlet (11) is arranged at the top end of the upper small shell.

The gas flow uniformizing device (2) is positioned above the blast furnace gas inlet (1), the gas uniformizing device (2) is provided with a plurality of layers of gas grids, and a certain angle is staggered between two adjacent layers of gas grids. Wherein, the demister (8) is a PP wire mesh demister, and phi 38mm pall ring packing is filled inside the demister. Wherein, a densimeter and a liquid level monitor are arranged in the water seal device (31), and an emergency water outlet (17) is arranged at the bottom end of the shell (7). Wherein, the top of the shell (7) is provided with a blast furnace gas outlet (11), the outlet is sequentially connected with a bleeding valve (25) and a dehydrator (18), the dehydrator (18) is a high-efficiency rotational flow plate dehydrator, and the mechanical water content of the gas at the outlet of the dehydrator can reach 7g/Nm³The following.

Wherein, circulating water spray set (4), alkali lye spray set (6) and sparge water spray set (10) all include along the radial a plurality of spray branch pipes that arrange of reactor section, arrange a plurality of nozzles on the spray branch pipe, guarantee that whole nozzle spray range covers whole cross-section, the injection direction is whole downwards. The nozzle type is preferably a solid cone nozzle.

Wherein, install circulating water spray set (4) above blast furnace gas entry (1) in order to constitute the first layer and spout the water layer, set up alkali lye spray set (6) in order to constitute the second layer and spout alkali layer above the first layer and spout alkali layer, spout alkali layer top at the second layer and set up defroster (8), set up above defroster (8) and wash water spray set (10) in order to constitute the third layer and wash the water layer.

Wherein, a water supply pump (19) and a flushing water valve (30) are arranged on a pipeline of the flushing water inlet (12) connected with the process water tank (23); wherein the flushing water valve (30) is arranged between the flushing water inlet (12) and the water supply pump (19).

Wherein, be provided with alkali liquor pipeline trip valve (27) and lye pump (20) on the pipeline that alkali liquor entry (13) are connected alkali liquor storage tank (24), wherein, alkali liquor pipeline trip valve (27) are installed between alkali liquor entry (13) and lye pump (20).

Wherein, still be provided with circulating water pipeline trip valve (29) on the pipeline that circulating water entry (14) is connected in circulating water export (15), and wherein, circulating water pipeline trip valve (29) are installed between circulating water entry (14) and circulating water pump (21).

Wherein, a bypass is led out from the pipeline between the flushing water valve (30) and the water feeding pump (19), the bypass is provided with an alkali liquor bypass and a circulating water bypass, and the alkali liquor bypass is connected to the back of an alkali liquor pipeline cut-off valve (27) through an alkali liquor pipeline bypass valve (26) and is used for flushing the nozzle of the alkali liquor spraying device (6) by using water in the process water tank (23); the circulating water bypass is connected with a circulating water pipeline stop valve (29) through a circulating water pipeline bypass valve (28) and then used for flushing a nozzle of the circulating water spraying device (4) by using water in the process water tank (23).

The invention also provides a method for operating a wet reactor as described, comprising the following steps:

(1) in the initial stage of equipment operation, firstly, a washing water valve (30) and an alkali liquor pipeline cut-off valve (27) are opened, a water feed pump (19) and an alkali liquor pump (20) are started to inject water and main absorbent into the whole reactor through a washing water spraying device (10) and an alkali liquor spraying device (6), the water feed pump (19) and the washing water valve (30) are closed after the operation is stable, and water in a process water tank (23) does not enter the reactor through the washing water spraying device (10); opening a circulating water pipeline cut-off valve (29), starting a circulating water pump (21) and directly returning part of waste liquid at the bottom of the shell (7) to the reactor through a circulating water inlet (14) and a circulating water spraying device (4) so as to participate in the reaction process again;

(2) when the system normally operates, the alkali liquor pipeline cut-off valve (27) and the circulating water pipeline cut-off valve (29) are normally opened, the flushing water valve (30), the alkali liquor pipeline bypass valve (26) and the circulating water pipeline bypass valve (28) are normally closed, and the alkali liquor spraying device (6) is communicated with the alkali liquor storage tank (24) through an alkali liquor inlet (13) and used for supplying an absorbent from the alkali liquor storage tank (24) and adjusting the flow of the alkali liquor according to the sulfur concentration in the gas at the outlet of the desulfurizing tower; the circulating water outlet (15) is connected with the circulating water inlet (14) through a circulating water pump (21), and part of waste liquid directly returns to the reactor to participate in the reaction process again, so that the utilization rate of alkali liquor is improved; when the system needs water supplement or the demister (8) needs cleaning, a washing water valve (30) is opened, and water in the process water tank (23) enters the reactor through a washing water spraying device (10); when the nozzle of the alkali liquor spraying device (6) needs to be washed, closing the alkali liquor pipeline cut-off valve (27), opening the alkali liquor pipeline bypass valve (26), and washing the nozzle of the alkali liquor spraying device (6) by using water in the process water tank (23); when the nozzles of the circulating water spray device (4) need to be washed, the circulating water pipeline stop valve (29) is closed, and the circulating water pipeline bypass valve (28) is opened, so that the nozzles of the circulating water spray device (4) are washed by water in the process water tank (23).

Preferably, the wet reactor comprises a shell, and the shell is internally provided with a water seal device, a blast furnace gas inlet, an airflow homogenizing device, a circulating water spraying device, an alkali liquor spraying device, a demister, a flushing water spraying device and a blast furnace gas outlet which are sequentially arranged from bottom to top; the side surface of the wet process reactor shell is sequentially provided with a waste liquid outlet, a circulating water inlet, an alkali liquor inlet and a washing water inlet from bottom to top; a washing water inlet is connected with a process water tank through a water feeding pump and is supplied with water by the water tank; the alkali liquor inlet is connected with an alkali liquor storage tank through an alkali liquor pump, and an absorbent is supplied to the alkali liquor storage tank; the circulating water outlet is connected with the circulating water inlet through a circulating water pump, and part of waste liquid directly returns to the reactor to participate in the reaction process again; the waste liquid discharge port is connected to a waste water treatment system through a liquid discharge pump, and the waste liquid is discharged periodically.

Preferably, the reactor comprises a blast furnace gas inlet positioned at the lower part of the shell, the gas flow homogenizing device is positioned above the gas inlet, the gas homogenizing device comprises a plurality of layers of gas grids, and the adjacent two layers of gas grids are staggered by a set angle.

Preferably, the specific arrangement mode of the circulating water spraying device, the alkali liquor spraying device and the washing water spraying device is as shown in figure 2, the number of the needed nozzles is calculated according to the diameter of the reactor, the spraying angle and the spraying distance of the nozzles, the spraying branch pipes are radially arranged along the section of the reactor, a certain number of nozzles are arranged on the branch pipes, a dotted line circle in figure 2 is the spraying range of a single nozzle, the spraying range of all the nozzles is ensured to cover the whole section, and the spraying direction is downward.

Preferably, the demister is positioned at the upper part of the reactor and is a PP wire mesh demister, phi 38 pall ring packing is filled in the demister, and after the demister preliminarily removes water, the mechanical water content in the coal gas can reach 20-30 g/Nm³。

Preferably, the top of the shell is provided with a blast furnace gas outlet which is sequentially connected with a blow-off valve and a dehydrator, the dehydrator is a high-efficiency spiral-flow plate dehydrator, and the mechanical water content of the gas at the outlet of the dehydrator can reach 7g/Nm³The grid-connection requirement is satisfied as follows.

Preferably, the bottom of the reactor is provided with a water seal device, so that gas leakage is prevented, and safe operation is ensured; meanwhile, the water seal device is used for receiving reaction waste liquid, a densimeter and a liquid level monitor are arranged in the water seal device, and an emergency water outlet is formed in the bottom end of the water seal device.

Preferably wherein, install first layer circulating water spray set (water spray layer) more than the coal gas entry, set up second floor alkali lye spray set (spraying alkali layer) above the water spray layer, set up the defroster spraying alkali layer top, set up the third layer above the defroster and wash water spray set (wash the water layer), adopt the mode that the three-layer was spouted and can realize that absorption liquid and coal gas fully contact, improve material utilization and desulfurization rate. The nozzle type is preferably a solid cone nozzle.

Preferably, the flushing water inlet is connected with the process water tank through a water feeding pump, and water is supplied by the water tank; the water supply pump is closed after the system runs stably, and the water supply pump is started only when the system needs water supplement or the demister, the alkali liquor nozzle and the circulating water nozzle need to be washed.

Preferably, the alkali liquor inlet is connected with an alkali liquor storage tank through an alkali liquor pump, the alkali liquor storage tank is used for supplying an absorbent, and the flow of the alkali liquor is adjusted according to the sulfur concentration in the coal gas at the outlet of the desulfurizing tower.

Preferably, the circulating water outlet is connected with the circulating water inlet through a circulating water pump, and part of waste liquid directly returns to the reactor to participate in the reaction process again, so that the utilization rate of the alkali liquor is improved.

The principle of the invention is that blast furnace gas at the outlet of the catalytic hydrolysis tower is directly introduced into a reactor, and water and alkali liquor in the reactor absorb H in the gas₂S、SO₂And HCl and other acidic gases, and the treated clean gas is discharged from the reactor and is merged into a pipe network. The reactor adopts a three-layer spraying mode to realize the full contact of the absorption liquid and the coal gas, thereby improving the material utilization rate and the sulfur removal rate. The desulfurization waste liquid directly returns to the reactor through a circulating water pump, so that the utilization rate of the alkali liquor is improved. The spraying water quantity is adjusted according to the water seal liquid level in the operation process and according to the outlet H₂The concentration of S is adjusted to spray alkali amount, the liquid discharge amount is adjusted according to the density of the desulfurization waste liquid, the removal of sulfur-containing substances in blast furnace gas is realized, and SO is solved from the source₂The problem of exceeding standard is solved, and meanwhile, the corrosion problem of the gas pipeline is controlled to a certain extent by the synergistic removal of HCl.

The invention has the beneficial effects that: the reactor adopts a three-layer spraying mode to realize the full contact of the absorption liquid and the coal gas, thereby improving the material utilization rate and the sulfur removal rate. The desulfurization waste liquid directly returns to the reactor through a circulating water pump, so that the utilization rate of the alkali liquor is improved. A water seal device (31) is arranged below the reactor to prevent gas leakage and ensure safe operation. The spraying water quantity is adjusted according to the water seal liquid level in the operation process and according to the outlet H₂Adjusting the concentration of S, adjusting the alkali spraying amount according to the density of the desulfurization waste liquid, directly introducing the blast furnace gas at the outlet of the catalytic hydrolysis tower into a reactor, realizing the removal of sulfur-containing substances in the blast furnace gas, and solving the problem of SO from the source₂The problem of exceeding standard is solved, and meanwhile, the corrosion problem of the gas pipeline is controlled to a certain extent by the synergistic removal of HCl. The invention provides a method for simultaneously realizing H in blast furnace gas₂S、SO₂A wet reactor for HCl and other acid gas removal. The reactor has simple structure, low cost and low maintenance cost, and solves the SO from the source₂The problem of exceeding standard is solved, meanwhile, the problem of corrosion of the gas pipeline is controlled to a certain extent by the synergistic removal of HCl, the reliability is good, the operation is stable, and the pollutant control cost is reduced.

Drawings

FIG. 1 is a schematic structural view of a wet reactor according to the present invention;

FIG. 2 is a nozzle layout for each spray level;

the labels in the figure are: 1-blast furnace gas inlet, 2-airflow homogenizing device, 3-circulating water nozzle, 4-circulating water spraying device, 5-alkali liquor nozzle, 6-alkali liquor spraying device, 7-reactor shell, 8-demister, 9-flushing water nozzle, 10-flushing water spraying device, 11-blast furnace gas outlet, 12-flushing water inlet, 13-alkali liquor inlet, 14-circulating water inlet, 15-circulating water outlet, 16-waste liquor outlet, 17-emergency water outlet, 18-dehydrator, 19-water feeding pump, 20-alkali liquor pump, 21-circulating water pump, 22-liquid discharging pump, 23-process water tank, 24-alkali liquor storage tank, 25-bleeding valve, 26-flushing water to alkali liquor pipeline bypass valve, 27-an alkali liquor pipeline cut-off valve, 28-a bypass valve of flushing water to a circulating water pipeline, 29-a circulating water pipeline cut-off valve, 30-a flushing water valve, 31-a water seal device, 32-a single circulating water (alkali liquor) nozzle injection range and 33-a single flushing water nozzle injection range.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

As shown in FIG. 1, a wet reactor capable of realizing total sulfur removal of blast furnace gas, preferably a wet reactor capable of realizing H in blast furnace gas₂S、SO₂The wet reactor for removing sulfur-containing substances and removing HCl in a synergistic manner comprises a shell 7, wherein the shell 7 is internally provided with a water seal device 31, a blast furnace gas inlet 1, an airflow homogenizing device 2, a circulating water spraying device 4, an alkali liquor spraying device 6, a demister 8, a flushing water spraying device 10 and a blast furnace gas outlet 11 which are sequentially arranged from bottom to top; a waste liquid outlet 16, a circulating water outlet 15, a circulating water inlet 14, an alkali liquor inlet 13 and a washing water inlet 12 are sequentially arranged on the side surface of the wet reactor shell 7 from bottom to top; the washing water inlet 12 is connected with a process water tank 23 through a water feeding pump 19 and is supplied with water by the water tank; the alkali liquor inlet 13 is communicated with the alkali liquor pump 20The alkali liquor storage tank 24 is connected and is used for supplying an absorbent; the circulating water outlet 15 is connected with the circulating water inlet 14 through a circulating water pump 21, and part of waste liquid directly returns to the reactor to participate in the reaction process again; the waste liquid discharge port 16 is connected to a waste water treatment system by a liquid discharge pump 22, and periodically discharges waste liquid. The main absorbent in the alkali liquor storage tank 24 is a sodium hydroxide (NaOH) solution with the mass fraction of 20% -32%, preferably, the molar ratio of the sodium hydroxide (NaOH) to the pollutants is controlled to be 1.0-2.0, so that the pollutants in the blast furnace gas can be efficiently removed. The water sealing is realized by the waste liquid at the bottom of the whole shell 7, so the water sealing device 31 comprises the waste liquid at the bottom, the waste liquid outlet 16 is positioned at the side surface of the shell 7 of the desulfurizing tower and is close to the lower part of the waste liquid at the bottom, and the specific position is shown in figure 1; the circulating water outlet 15 is located at the upper part of the whole water sealing device 31.

As shown in fig. 1, the reactor comprises a blast furnace gas inlet 1 positioned at the lower part of a shell 7, the gas flow uniformizing device 2 is positioned above the gas inlet, the gas uniformizing device comprises a plurality of layers of gas grids, and the adjacent two layers of gas grids are staggered by a set angle. The specific arrangement of the circulating water spray device 4, the alkali liquor spray device 6 and the flushing water spray device 10 is as shown in figure 2, the number of the needed nozzles is calculated according to the diameter of the reactor, the spray angle and the spray distance of the nozzles, spray branch pipes are radially arranged along the section of the reactor, a certain number of nozzles are arranged on the branch pipes, 32 and 33 in figure 2 are the spray range of a single nozzle, the spray range of all the nozzles is ensured to cover the whole section, and the spray direction is all downward. The demister 7 is positioned at the upper part of the reactor and is a PP wire mesh demister, phi 38 (unit is mm) pall ring packing is filled inside the demister, and after the demister removes water preliminarily, the mechanical water content in the coal gas can reach 20-30 g/Nm³。

As shown in figure 1, the top of the reactor shell 7 is provided with a blast furnace gas outlet 11, the outlet is sequentially connected with a blow-off valve 25 and a dehydrator 18, the dehydrator 18 is a high-efficiency rotational flow plate dehydrator, and the mechanical water content of the gas at the outlet of the dehydrator can reach 7g/Nm³The grid-connection requirement is satisfied as follows. The water seal device 31 is arranged at the bottom of the reactor, so that gas leakage is prevented, and safe operation is ensured; meanwhile, the water seal device is used for receiving reaction waste liquid, is internally provided with a densimeter andthe liquid level monitor, because the water seal leans on whole bottom waste liquid to realize, the implication that is provided with densimeter and liquid level monitor in water seal arrangement 31 is that the waste liquid the inside sets up densimeter and liquid level monitor, and casing 7 bottom sets up urgent discharge outlet 17. Install first layer circulating water spray set (water spray layer) 4 above the coal gas entry, set up second floor alkali lye spray set (spout alkali layer) 6 above water spray layer 4, set up defroster 8 above spouting alkali layer 6, set up third layer sparge water spray set (wash water layer) 10 above defroster 8, adopt the mode that the three-layer was spouted in can realize that absorption liquid and coal gas fully contact, improve material utilization and desulfurization rate. The nozzle type is preferably a solid cone nozzle.

As shown in fig. 1, a flushing water valve 30 is arranged between a flushing water inlet 12 and a water feeding pump 19, an alkali liquor pipeline cut-off valve 27 is arranged between an alkali liquor inlet 13 and an alkali liquor pump 20, and a circulating water pipeline cut-off valve 29 is arranged between a circulating water inlet 14 and a circulating water pump 21; meanwhile, in order to meet the requirement of flushing the alkali liquor nozzle and the circulating water nozzle in the operation process, a bypass is led out on a pipeline between the flushing water valve 30 and the water feeding pump 19 and is respectively connected to the alkali liquor pipeline stop valve 27 and the circulating water pipeline stop valve 29, and a flushing water-to-alkali liquor pipeline bypass valve 26 and a flushing water-to-circulating water pipeline bypass valve 28 are installed on two bypass pipelines. The washing water inlet 12 is connected with a process water tank 23 through a water feeding pump 19 and is supplied with water by the water tank; in the initial stage of equipment operation, firstly, the flushing water valve 30 and the alkali liquor pipeline stop valve 27 are opened, the whole system is filled with water and main absorbent through the water feed pump 19 and the alkali liquor pump 20, the water feed pump 19 and the flushing water valve 30 are closed after the system is stably operated, the circulating water pipeline stop valve 29 is opened, and part of waste liquid directly returns to the desulfurizing tower to participate in the reaction process again. When the gas desulfurization tower is in normal operation, the alkali liquor pipeline stop valve 27 and the circulating water pipeline stop valve 29 are normally opened, the flushing water valve 30, the flushing water-to-alkali liquor pipeline bypass valve 26 and the flushing water-to-circulating water pipeline bypass valve 28 are normally closed, and the flow of the alkali liquor is adjusted according to the sulfur concentration in the gas at the outlet of the desulfurization tower. The circulating water outlet 15 is connected with the circulating water inlet 14 through a circulating water pump 21, and part of waste liquid directly returns to the reactor to participate in the reaction process again, so that the utilization rate of alkali liquor is improved. When the system needs to be supplemented with water or the demister 8 needs to be cleaned, the flushing water valve 30 is opened; when the alkali liquor nozzle needs to be washed, closing the alkali liquor pipeline cut-off valve 27, and opening the washing water to the alkali liquor pipeline bypass valve 26; when the circulating water nozzle needs to be flushed, the circulating water pipeline cut-off valve 29 is closed, and the flushing water is opened to the circulating water pipeline bypass valve 28.

The spraying water quantity is adjusted according to the water seal liquid level in the operation process and according to the outlet H₂The concentration of S is adjusted to spray alkali amount, the liquid discharge amount is adjusted according to the density of the desulfurization waste liquid, the removal of sulfur-containing substances in blast furnace gas is realized, and SO is solved from the source₂The problem of exceeding standard is solved, and meanwhile, the corrosion problem of the gas pipeline is controlled to a certain extent by the synergistic removal of HCl.

The gas grating 2, the circulating water spray head 3, the alkali liquor spray head 5, the washing water spray head 9, the demister 8 and the dehydrator 18 can all adopt the existing products sold in the market. Therefore, the blast furnace gas total sulfur removal wet reactor provided by the invention has the advantages of simple structure, low manufacturing cost, low maintenance cost, few movable parts, difficulty in failure, high operation rate and the like, and reduces the pollutant control cost.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.