CN212800255U - Blast furnace gas adsorption desulfurization device - Google Patents
Blast furnace gas adsorption desulfurization device Download PDFInfo
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- CN212800255U CN212800255U CN202020386097.5U CN202020386097U CN212800255U CN 212800255 U CN212800255 U CN 212800255U CN 202020386097 U CN202020386097 U CN 202020386097U CN 212800255 U CN212800255 U CN 212800255U
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Abstract
The utility model relates to a blast furnace gas adsorbs desulfurated device. The device include gravity dust remover, dry process sack cleaner, TRT excess pressure power generation facility, pressure regulating valves, adsorb smart desulfurizing tower, adsorb and set up gas uniform distributor, heat exchanger, conveying fan, each valves and connecting tube in the smart desulfurizing tower. Solves the problems that the catalyst is easy to lose effectiveness, the investment cost is higher and the sulfide removing effect is unstable when the blast furnace gas is purified by using the current catalytic hydrolysis or catalytic hydrogenolysis organic sulfur removing process route.
Description
Technical Field
The utility model relates to a device for absorbing and desulfurizing blast furnace gas, in particular to a device for removing COS and CS in the blast furnace gas2And H2And S.
Background
At present, blast furnace gas is used as a combustible byproduct generated by blast furnace iron making, and can be conveyed to various gas users in a factory, and more conventional gas users are blast furnace hot blast stoves, sintering, gas boilers and the like. The blast furnace gas mainly comprises 20-25 percent of CO and N2(50-55%), and CO2(23-25%). Meanwhile, the content of a small amount of sulfide in the blast furnace gas is about 20-50mg/Nm3Inorganic sulfide of hydrogen sulfide H2S, and a content of about 140-170mg/Nm3The organic sulfide carbonyl sulfide COS, and other trace inorganic Sulfur (SO)2) And organic sulfur (CS)2) And the like. About 200mg/Nm3The total sulfur content of the sulfur is sent to a gas user for combustion, and SO in the flue gas2The content cannot meet the existing discharge standard of the user terminal. At present, the mature flue gas desulfurization technology is end treatment, but a set of desulfurization equipment needs to be put into each blast furnace gas end user, so that the total investment is large, and the total maintenance and operation cost is high. Therefore, the front-end treatment reduces the sulfide in the fuel gas, so that the fuel gas is cleaner, and simultaneously, the investment of a desulfurization device required by the tail end treatment of each gas user is saved.
In the prior front-end desulfurization technology of blast furnace gas, inorganic sulfur (mainly H) is removed2S) technology is mature, the exploration of a processing route for removing organic sulfur follows the technical scheme of coke oven gas desulfurization and purification, namely organic sulfur COS is catalyzed to hydrolyze or is catalyzed to hydrogenolysis to generate H2S, then the converted H is put into2S removal, the chemical equation is as follows: COS + H2O＝H2S+CO2Or COS + H2＝H2And (4) S + CO. But the components and the contents of the components of the blast furnace gas and the coke oven gasThe purification effect of the blast furnace gas by using the technical scheme of coke oven gas desulfurization is not ideal and the cost is too high. Either the occupation of water by the catalyst during catalytic hydrolysis or the need for hydrogen addition during catalytic hydrogenolysis makes this route less feasible. The catalyst has harsh use environment, and is easy to be poisoned or inactivated in the use process, thereby being ineffective. Therefore, the removal of the organic sulfur COS in the blast furnace gas becomes a technical difficulty in the purification of the blast furnace gas.
SUMMERY OF THE UTILITY MODEL
The utility model solves the technical problem of purifying blast furnace gas for the end gas users. The utility model provides a novel blast furnace gas sulfide adsorption and removal device, in particular to a blast furnace gas organic sulfur COS adsorption and removal device. Solves the problems that the catalyst is easy to lose effectiveness, the investment cost is higher and the sulfide removing effect is unstable when the blast furnace gas is purified by using a catalytic hydrolysis or catalytic hydrogenolysis organic sulfur removing route at present.
The blast furnace gas of the utility model is discharged from the top of the blast furnace, and sequentially passes through the gravity dust collector, the dry cloth bag dust collector and the TRT (blast furnace top gas recovery turbine) residual pressure power generation device. At the outlet of the TRT excess pressure power generation device, the excess pressure is introduced into an adsorption fine desulfurization tower. After the high-sulfur capacity hydrophobic molecular sieve adsorbent layer in the adsorption fine desulfurization tower is fully contacted with the high-sulfur capacity hydrophobic molecular sieve adsorbent layer, the sulfide content in the blast furnace gas subjected to adsorption fine desulfurization can reach that the total sulfur is less than 25mg/Nm3. Through the purification scheme can convey blast furnace gas after adsorption and fine desulfurization to each terminal gas user, under the condition of no need of terminal emission flue gas desulfurization treatment device, the atmosphere pollutant (SO) of the state to the operation device of the terminal gas user in the related factory is reached2) Emission standard, i.e. less than 35mg/Nm3Or less than 50mg/Nm3。
For realizing the sulfide removal, the utility model provides a following scheme:
a blast furnace gas adsorption desulfurization device comprises a gravity dust collector, a dry-method bag-type dust collector, a TRT (blast furnace gas recovery turbine) excess pressure power generation device, a pressure regulating valve bank, an adsorption fine desulfurization tower, a heat exchanger, a conveying fan, valve banks and connecting pipelines;
the number of the adsorption fine desulfurization towers is 4, the adsorption fine desulfurization towers are divided into 2 groups (I group and II group), each group comprises 2 groups (tower IA, tower IB, tower IIA and tower IIB), and the working modes of the adsorption fine desulfurization towers are that one group is in an adsorption state and the other group is in a thermal desorption state.
The inlet of the adsorption fine desulfurization tower (tower IA, tower IB, tower IIA and tower IIB) contains a gas uniform distributor, and optionally, the gas uniform distributor selects a guide plate distributed at the gas inlet of the low-pressure blast furnace at the bottom of the tower. The low-pressure coal gas enters the tower from the bottom of each tower, is uniformly distributed into the fine desulfurization tower through the guide plates, and passes through the adsorbent packing layer.
When the tower set is in the adsorption fine desulfurization working state, the air inlet mode is from bottom to top.
The adsorbent packing layer in the tower set is divided into two layers, namely an upper layer and a lower layer, and the coal gas passes through the adsorbent packing layer from bottom to top after passing through the guide plate through an inlet below the tower set. Preferably, the main component of the lower layer of the packing layer is a molecular sieve, and the main component of the upper layer of the packing layer is modified activated alumina.
The desulfurizing agent filler used for desulfurizing in the tower is one or a combination of a plurality of molecular sieves, activated alumina and zeolite.
Preferably, the desulfurizer filler is at least one of 3A type molecular sieve, 4A type molecular sieve, 5A type molecular sieve, 13X type molecular sieve, RK-29HP molecular sieve, RK-29II molecular sieve, SG-731 activated alumina, RK-33 molecular sieve and AZ-300 conforming molecular sieve.
The utility model discloses used fan is the main fan that needs the explanation, and preferably, this fan is for carrying the fan. In order to realize the utility model, the utility model is not limited to the conveying fan described herein.
Besides the pressure regulating valve set, optionally, the other valve sets are flow control valves or other valve sets capable of cutting off the material flow channel and enabling the material flow channel to be in the same row.
The utility model discloses a blast furnace gas adsorbs the desulfurization: comprises the steps of absorbing, removing and adsorbing (purifying) sulfide of blast furnace gas and thermal desorption.
The adsorption (purification) comprises the following steps:
1.) blast furnace raw gas is discharged from the top of the blast furnace, enters a gravity dust collector to remove large particle dust, is discharged from the gravity dust collector, enters a dry bag dust collector to remove smaller particle dust, and forms blast furnace gas;
2.) the blast furnace gas is discharged by a dry-method bag-type dust collector, enters a TRT (blast furnace top gas recovery turbine) excess pressure generating device and a pressure regulating valve bank, and forms low-pressure blast furnace gas after excess pressure is utilized;
3.) the low-pressure blast furnace gas enters an adsorption fine desulfurization working tower group I, enters a tower IA and a tower IB for adsorption fine desulfurization to form clean blast furnace gas;
4.) when the sulfur capacity of the adsorbents in the tower IA and the tower IB in the working tower group I is saturated, the working tower group I enters a thermal desorption state, the low-pressure blast furnace gas is cut into the adsorption fine desulfurization working tower group II and enters the tower IIA and the tower IIB for adsorption fine desulfurization to form clean blast furnace gas;
5.) when the sulfur capacity of the adsorbing agents in the tower IIA and the tower IIB in the working tower group II is saturated, the working tower group II enters a thermal desorption state, the low-pressure blast furnace gas is cut into the adsorption fine desulfurization working tower group I after thermal desorption and cooling again, the low-pressure blast furnace gas enters the tower IA and the tower IB for adsorption fine desulfurization to form clean blast furnace gas, and the steps 3) -5.) are repeated;
6.) one part of the clean blast furnace gas is shunted for thermal decomposition and absorption, and the rest clean blast furnace gas is conveyed to gas users in the plant area.
The thermal desorption comprises the following steps:
a.) a part of gas is divided from the clean blast furnace gas to form pyrolysis absorption gas, the divided pyrolysis absorption gas is introduced into a heat exchanger through a conveying fan, and the product thermal desorption clean gas heated by steam enters a tower group I or a tower group II in a thermal desorption state and does not enter a corresponding tower group II or a tower group I in a working state;
b.) thermally desorbing the clean coal gas by using a tower group I or a tower group II in a thermal desorption state, thermally desorbing the adsorbing material, and removing the adsorbed sulfide (COS and H) from the tower group2S、CS2) Mixing, and discharging to tower IA, IB or tower IIA, IIB to form desorption product gas;
c.) optionally, the desorbed product gas is sent to a combustion gas section of an existing end flue gas desulfurization unit of the plant for use.
The desorbed product gas is not only conveyed to a sintering section of an existing tail end flue gas desulfurization device in a factory area for use, but also can be conveyed to other gas users provided with the tail end flue gas desulfurization devices for use.
Each valve bank comprises a pressure regulating valve bank and an associated flow limiting valve.
In the above-mentioned steps 3.) to 6.) and steps a.) to c.), the control of the relevant flow-limiting valves is carried out for the alternate cyclic use of the column group I and the column group II. When the tower group I carries out adsorption and fine desulfurization work, the valve group for controlling the gas to enter the tower group I for fine desulfurization and adsorption is opened, the valve group for controlling the gas to enter the tower group I for thermal desorption is closed, the valve group for controlling the gas to enter the tower group II for fine desulfurization and adsorption is closed, the valve group for controlling the gas to enter the tower group II for thermal desorption is opened, the low-pressure blast furnace gas is purified by the tower group I to form clean blast furnace gas, one part of the clean blast furnace gas is shunted to form thermal desorption gas, the rest clean blast furnace gas is conveyed to plant area gas users, and the thermal desorption gas enters the tower group II in a thermal desorption state to form thermal desorption product gas.
Further, when the steps 3) to 6) are performed in a circulating manner, the tower group I enters a thermal desorption state after saturated adsorption, the valve group for controlling the gas to enter the tower group I for thermal desorption is opened, the valve group for controlling the gas to enter the tower group I for fine desulfurization and adsorption is closed, meanwhile, the tower group II enters an adsorption fine desulfurization working state, the valve for controlling the gas to enter the tower group II for fine desulfurization and adsorption is opened, the valve for controlling the gas to enter the tower group II for thermal desorption is closed, the low-pressure blast furnace gas forms clean blast furnace gas after being purified by the tower group II, one part of the low-pressure blast furnace gas is shunted to form gas for thermal desorption, and the rest of the clean blast furnace gas is conveyed to plant gas users. And the coal gas for thermal desorption enters the tower group I for thermal desorption and is discharged to form thermal desorption product coal gas.
When the tower set is in a thermal desorption state, preferably, clean coal gas enters the tower from a desorption gas inlet at the upper end of the tower and above the adsorbent packing layer, the packing layer is heated, the adsorbent slowly releases sulfides attached to the adsorbent, and the sulfides are discharged from an outlet at the lower end of the tower and below the adsorbent packing layer to form thermal desorption product coal gas.
And the thermal desorption product gas enters each gas user in the plant area, and preferably enters a sintering section.
In the above cycle, the tower set in the thermal desorption state is divided into two stages, wherein the first stage is thermal desorption of the adsorbent, and the second stage is cooling of the adsorbent after thermal desorption.
Optionally, the valve group in the above step is a flow limiting valve.
And furthermore, the flow limiting valve group on each tower group is divided into an adsorption fine desulfurization working valve group and a thermal desorption valve group, and when the adsorption fine desulfurization working valve group of the tower group is opened, the thermal desorption valve group is closed. And closing the adsorption fine desulfurization working valve group of the other tower group, and opening the thermal desorption valve group. After the sulfur capacity of the current adsorption fine desulfurization working tower group is saturated, the valve group in the original opening state is closed, the valve group in the closing state is opened, and the valve group is circulated and continuously used.
After the thermal desorption of the thermal desorption tower group, a certain cooling time is needed to cool the adsorbent.
In the blast furnace gas sulfide adsorption and removal system, the optimal temperature of the low-pressure blast furnace gas is 20-120 ℃.
When the tower set is in the thermal desorption state, the heat exchanger preferably heats the clean thermal desorption coal gas after being divided to 180-280 ℃.
In the low-pressure blast furnace gas, the amount of the particles contained in the blast furnace gas is required to be less than 5mg/Nm3。
The utility model has the advantages that:
compared with the prior application of removing H by catalytic hydrolysis COS and spraying alkali liquor2S, the device for removing sulfides is simple, the temperature reduction and temperature rise after the dust removal of the blast furnace gas are eliminated, and the tail end of the device for spraying alkali and removing H is eliminated2The alkali liquor system and the reaction container required by S are more efficientAnd removing sulfides in the blast furnace gas.
The desorption product gas of the utility model contains COS and H2S and other sulfides are properly treated in the sintering section of the steel plant in operation because the corresponding flue gas desulfurization treatment is matched with the sintering section of the steel plant in operation, the sulfides subjected to thermal desorption are not subjected to over standard discharge after combustion, and the tail end SO does not need to be added2The purification treatment, the original flue gas desulfurization treatment device can reach the atmosphere pollutant SO set by the state for the sintering machine2And (4) emission standard. Compared with the prior stage that the original blast furnace gas and the conversion product H need to be removed again at the hydrolysis tail end2And S, a section of flow is omitted, so that the investment is saved while the whole purification system is simplified.
The utility model discloses carry out the absorption desulfurization behind TRT excess pressure power generation facility, avoided the blast furnace gas depressurization treatment, do not have the value of utilization that the loss blast furnace gas itself has. The low-pressure blast furnace gas after the TRT residual pressure power generation device enters an adsorption fine desulfurization working tower group, thereby providing greater feasibility for technically improving the production line which is put into operation and additionally arranging fine desulfurization equipment.
The utility model discloses use the clean coal gas of the fractional product after the desulfurization purifies, use the heat exchanger to assist steam heating back, let in and adsorb the tower of saturation and carry out thermal desorption. The purified coal gas is circularly used without specially heating air and nitrogen, and the adsorption fine desulfurization work and the desorption thermal desorption are alternately carried out between the tower group I and the tower group II of the adsorption fine desulfurization tower, so that the blast furnace gas fine desulfurization is efficiently completed without excessive additional equipment and additional investment.
The utility model discloses use the physical adsorption technique, adsorb the sulphide among the desorption blast furnace gas, especially desorption COS avoids the produced catalyst deactivation of the sulphur removal through chemical reaction and the too high problem of cost.
In order to ensure that the desulfurized blast furnace gas reaches the national atmospheric pollutants (SO) of the devices operated by the related end gas users after being combusted at the gas user ends2) The total sulfide content in the purified blast furnace gas is required to be lower than 30mg/Nm according to the emission standard3. The blast furnace gas is introduced into a dust removing device and a TRT deviceThe fine desulfurization adsorption device can effectively adsorb sulfide in the device, and blast furnace gas treated by the device can be conveyed to each end gas user, SO that SO can be controlled2And (4) discharging the amount.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
the intended major equipment and logistics channels are identified as follows:
a first material flow channel 1, a second material flow channel 2, a third material flow channel 3, a fourth material flow channel 4, a fifth material flow channel 5, a sixth material flow channel 6, a seventh material flow channel 7, an eighth material flow channel 8, a ninth material flow channel 9, a steam pipeline 10, a blast furnace 11, a gravity dust collector 12, a dry bag dust collector 13, a TRT residual pressure power generation device 14, a conveying fan 15, a heat exchanger 16, a first flow control valve 17, a second flow control valve 18, a tower group I19, a tower IA20, a tower IB21, a tower group II22, a tower IIA23, a tower IIB24, a third flow control valve 25, a fourth flow control valve 26, a fifth flow control valve 27, a sixth flow control valve 28, a seventh flow control valve 29, an eighth flow control valve 30 and a pressure regulating valve group 31.
Detailed Description
Referring to fig. 1, the utility model discloses a blast furnace gas adsorbs desulphurization unit, blast furnace gas is discharged by 11 tops of blast furnace, get into gravity dust remover 12 and detach the large granule dust, gravity dust remover 12 discharges the back, get into dry process sack cleaner 13, detach less granule dust, get into TRT excess pressure power generation facility 14 and pressure regulating valves 31 after discharging, form low pressure blast furnace gas after the excess pressure utilizes, low pressure blast furnace gas gets into adsorbs the fine desulfurization in adsorbing fine desulfurization work tower group I19, form clean blast furnace gas, carry to factory gas user.
The operation is carried out according to the steps, when the sulfur capacity of the adsorbent in the working tower group I19 is saturated, the working tower group I19 enters a thermal desorption state, the low-pressure blast furnace gas is switched into the adsorption fine desulfurization working tower group II22 for adsorption fine desulfurization to form clean blast furnace gas, the clean blast furnace gas is conveyed to plant gas users, when the sulfur capacity of the adsorbent in the working tower group II22 is saturated, the working tower group II22 enters a thermal desorption state, the low-pressure blast furnace gas is switched into the adsorption fine desulfurization working tower group I19 which is cooled by thermal desorption again for purification to form clean blast furnace gas, and the steps are repeated.
And (4) operating according to the steps, shunting one part of the clean blast furnace gas for pyrolysis and suction, and conveying the rest clean blast furnace gas to plant gas users.
And in the tower group thermal desorption state, a part of gas is separated from the clean blast furnace gas to form thermal desorption gas, the thermal desorption gas is introduced into a heat exchanger 16 through a conveying fan 15, the product thermal desorption clean gas heated by steam enters the tower group I19 or the tower group II22 in the thermal desorption state, and does not enter the corresponding tower group II22 or the tower group I19 in the working state.
The tower group I19 and the tower group II22 comprise 4 adsorption fine desulfurization towers which are divided into 2 groups (i.e. the tower group I19 and the tower group II22), each group comprises 2 adsorption fine desulfurization towers (i.e. the tower IA20, the tower IB21, the tower IIA23 and the tower IIB24), and the working modes of the adsorption fine desulfurization towers are that one group is in an adsorption state and the other group is in a thermal desorption state.
The inlet of the adsorption fine desulfurization tower (tower IA20, tower IB21, tower IIA23 and tower IIB24) comprises a gas distributor, and optionally, the gas distributor adopts guide plates which are uniformly distributed at the bottom of the tower and are arranged at the gas inlet of the low-pressure blast furnace. The low-pressure coal gas enters the tower from the bottom of each tower, is uniformly distributed into the fine desulfurization tower through the guide plates, and passes through the adsorbent packing layer.
The adsorption fine desulfurization tower is characterized in that in the working state, the gas inlet mode is from bottom to top, namely, the gas passes through the guide plate through the inlet below the tower group, then passes through the adsorbent packing layer and passes through the (adsorbent) packing layers from bottom to top.
The main component of the lower layer of the adsorbent packing layer is a molecular sieve, and the main component of the upper layer of the packing layer is modified activated alumina.
And a thermal desorption step, namely thermally desorbing the clean thermal desorption gas by using a tower group I19 or a tower group II22 in a thermal desorption state, mixing the adsorbed material with the sulfide (COS, H2S and CS2) removed from the tower group, and discharging the gas out of the towers IA, IB20 and 21 or the towers IIA, IIB23 and 24 to form desorption product gas.
And desorbing the product gas, wherein the desorbed product gas is sent to a gas burning working section provided with a tail end flue gas desulfurization device in a plant area for use.
In the thermal desorption state, clean coal gas enters the tower from the upper end of the tower and a desorption gas inlet positioned above the adsorbent packing layer, the (adsorbent) packing layer is heated, the adsorbent slowly releases sulfide attached to the adsorbent, and the sulfide is discharged from an outlet positioned at the lower end of the tower and below the adsorbent packing layer to form thermal desorption product coal gas.
The tower group in thermal desorption state is divided into two stages, wherein the first stage is thermal desorption of the adsorbent, and the second stage is cooling of the adsorbent after thermal desorption.
The desulfurizer packing component used for removing sulfide in the tower group is one or a combination of a plurality of molecular sieves, active alumina and zeolite.
The desulfurizer filler is at least one of a 3A type molecular sieve, a 4A type molecular sieve, a 5A type molecular sieve, a 13X type molecular sieve, a RK-29HP molecular sieve, a RK-29II molecular sieve, SG-731 activated alumina, a RK-33 molecular sieve and an AZ-300 conforming molecular sieve.
Specifically, the blast furnace gas adsorption desulfurization device comprises a gravity dust collector 12, a dry bag dust collector 13, a TRT (blast furnace top pressure recovery turbine) residual pressure power generation device 14, a pressure regulating valve group 31, an adsorption fine desulfurization tower, a heat exchanger 16, a conveying fan 15, valve groups and connecting pipelines;
the number of the adsorption fine desulfurization towers is 4, and the adsorption fine desulfurization towers are divided into a tower group I19 and a tower group II222, the tower group I19 comprises a tower IA20 and a tower IB21 which are juxtaposed, the tower group II22 comprises a tower IIA23 and a tower IIB24 which are juxtaposed, and the operation modes of the adsorption fine desulfurization towers are that one group is in an adsorption state, and the other group is in a thermal desorption state; when the tower set is in the working state of adsorption fine desulfurization, the gas inlet mode is from bottom to top;
the valve group comprises a first flow control valve 17, a second flow control valve 18, a third flow control valve 25, a fourth flow control valve 26, a fifth flow control valve 27, a sixth flow control valve 28, a seventh flow control valve 29 and an eighth flow control valve 30;
the connecting pipelines comprise a first material flow channel 1, a second material flow channel 2, a third material flow channel 3, a fourth material flow channel 4, a fifth material flow channel 5, a sixth material flow channel 6, a seventh material flow channel 7, an eighth material flow channel 8, a ninth material flow channel 9 and a steam pipeline 10;
the inlet of the adsorption fine desulfurization tower comprises a gas uniform distributor, an adsorbent packing layer is arranged in the adsorption fine desulfurization tower, and the adsorbent packing layer in the tower set is divided into two layers, namely an upper layer and a lower layer;
the output end of the blast furnace 11 is sequentially provided with a first material flow channel 1, a gravity dust collector 12, a second material flow channel 2, a dry-method bag-type dust collector 13 and a third material flow channel 3, and the output end of the third material flow channel 3 is provided with a pressure regulating valve group 31 and a TRT (blast furnace top gas recovery turbine) residual pressure power generation device 14 in parallel; the pressure regulating valve group 31 and the output end of the TRT residual pressure power generation device 14 are connected with a fourth material flow channel 4, the output end of the fourth material flow channel 4 is connected with a tower group I19 and a tower group II22 in parallel, the input end of the tower group I19 is provided with a first flow control valve 17, the input end of the tower group II22 is provided with a third flow control valve 25, the output ends of the tower group I19 and the tower group II22 are respectively provided with a first channel and a second channel, the first channels of the tower group I19 and the tower group II22 are connected to a seventh material flow channel 7, the second channels of the tower group I19 and the tower group II22 are connected to a fifth material flow channel 5, the output ends of the first channels of the tower group I19 and the tower group II22 are respectively provided with a fifth flow control valve 27 and a seventh flow control valve 29, the output ends of the tower group I19 and the second channels of the tower group II22 are respectively provided with a second flow control valve 18 and a fourth flow control valve 26, the output ends of the tower group I19 and the tower group II22 are respectively provided with a third channel 19, the output end, An eighth flow control valve 30; the output end of the seventh material flow channel 7 is provided with a heat exchanger 16; a ninth material flow channel 9 is arranged at the output end of the fifth material flow channel 5, a sixth material flow channel 6 is arranged between the heat exchanger 16 and the input end of the ninth material flow channel 9, and a conveying fan 15 is arranged on the sixth material flow channel 6; the steam pipeline 10 is arranged on a heat exchanger 16.
Furthermore, the desulfurizer packing component used for removing sulfides in the absorption fine desulfurization tower is one or a combination of a plurality of molecular sieves, active alumina and zeolite.
Still further, the desulfurizer filler is at least one of 3A type molecular sieve, 4A type molecular sieve, 5A type molecular sieve, 13X type molecular sieve, RK-29HP molecular sieve, RK-29II molecular sieve, SG-731 activated alumina, RK-33 molecular sieve and AZ-300 conforming molecular sieve.
Furthermore, the gas uniform distributor is a guide plate distributed at a low-pressure blast furnace gas inlet at the bottom of the adsorption fine desulfurization tower.
The utility model discloses the use of device:
A) the blast furnace gas is discharged from the top of the blast furnace 11, enters a gravity dust collector 12 to remove large-particle dust, enters a dry-method bag dust collector 13 after being discharged from the gravity dust collector 12 to remove smaller-particle dust, enters a TRT excess pressure power generation device 14 and a pressure regulating valve group 31 after being discharged, forms low-pressure blast furnace gas after excess pressure utilization, enters an adsorption fine desulfurization working tower group I19 to be subjected to adsorption fine desulfurization to form clean blast furnace gas, and is conveyed to plant gas users;
B) the step A) is operated, when the sulfur capacity of the adsorbent in the working tower group I19 is saturated, the working tower group I19 enters a thermal desorption state, the low-pressure blast furnace gas is switched into the adsorption fine desulfurization working tower group II22 to be adsorbed and fine desulfurized to form clean blast furnace gas, the clean blast furnace gas is conveyed to plant gas users, when the sulfur capacity of the adsorbent in the working tower group II22 is saturated, the working tower group II22 enters a thermal desorption state, the low-pressure blast furnace gas is switched into the adsorption fine desulfurization working tower group I19 which is cooled by thermal desorption again to be purified to form clean blast furnace gas, and the steps are repeated in this way;
operating according to the steps A) and B), shunting part of the clean blast furnace gas for pyrolysis and suction, and conveying the rest clean blast furnace gas to plant gas users; in the tower group thermal desorption state, a part of gas is separated from clean blast furnace gas to form thermal desorption gas, the thermal desorption gas is introduced into a heat exchanger 16 through a conveying fan 15, and the product thermal desorption clean gas heated by steam enters a tower group I19 or a tower group II22 in the thermal desorption state and does not enter a corresponding tower group II22 or a tower group I19 in the working state; the tower group I19 and the tower group II22 comprise 4 adsorption fine desulfurization towers which are divided into a tower group I19 and a tower group II222, the tower group I19 comprises a tower IA20 and a tower IB21, the tower group II22 comprises a tower IIA23 and a tower IIB24, and the adsorption fine desulfurization towers work in a mode that one tower is in an adsorption state and the other tower is in a thermal desorption state.
Further, the adsorption state comprises the following steps:
1.) blast furnace raw gas is discharged from the top of the blast furnace, enters a gravity dust collector 12 to remove large-particle dust, is discharged from the gravity dust collector 12, enters a dry bag dust collector 13 to remove smaller-particle dust, and forms blast furnace gas;
2.) the blast furnace gas is discharged from the dry-method bag-type dust collector 13, enters the TRT excess pressure generating device 14 and the pressure regulating valve bank 31, and forms low-pressure blast furnace gas after excess pressure is utilized;
3.) the low-pressure blast furnace gas enters an adsorption fine desulfurization working tower group I19, enters a tower IA20 and a tower IB21 for adsorption fine desulfurization to form clean blast furnace gas;
4.) when the sulfur capacity of the adsorbents in the tower IA20 and the tower IB21 in the working tower group I19 is saturated, the working tower group I19 enters a thermal desorption state, the low-pressure blast furnace gas is switched into the adsorption fine desulfurization working tower group II22, and enters the tower IIA23 and the tower IIB24 for adsorption fine desulfurization to form clean blast furnace gas;
5.) when the sulfur capacity of the adsorbents in the tower IIA23 and the tower IIB24 in the working tower group II22 is saturated, the working tower group II22 enters a thermal desorption state, the low-pressure blast furnace gas is cut into the adsorption fine desulfurization working tower group I19 after thermal desorption cooling again, the low-pressure blast furnace gas enters the tower IA20 and the tower IB21 for adsorption fine desulfurization to form clean blast furnace gas, and the steps 3) -5.) are repeated;
6.) one part of the clean blast furnace gas is shunted for thermal decomposition and absorption, and the rest clean blast furnace gas is conveyed to gas users in the plant area.
Further, the thermal desorption comprises the following steps:
a.) a part of gas is separated from the clean blast furnace gas to form pyrolysis absorption gas, the separated pyrolysis absorption gas is introduced into a heat exchanger 16 through a conveying fan 15, the product thermal desorption clean gas heated by steam enters a tower group I19 or a tower group II22 in a thermal desorption state, and does not enter a corresponding tower group II22 or a corresponding tower group I19 in a working state;
b.) thermally desorbing the clean coal gas by using a tower group I19 or a tower group II22 in a thermal desorption state, mixing the adsorbed material with the sulfide removed and adsorbed in the tower group after thermally desorbing the adsorbed material, and discharging the gas out of the towers IA, IB20 and 21 or IIA, IIB23 and 24 to form desorption product coal gas;
and further, the desorbed product gas is sent to a combustion gas section of an existing tail-end flue gas desulfurization device in the plant area for use.
The following embodiments are provided to explain the present disclosure without limiting the scope and mode of use of the disclosure. The following embodiments are not the only implementations of the present invention. The technical personnel who are familiar with the field can properly modify the flow, replace the universal equipment and have non-innovative changes within the protection scope of the invention.
The flow and features of the present invention will be described with reference to the embodiments and the accompanying drawings. The following example is an example of an implementation.
As shown in the attached figure 1, the utility model provides a pair of blast furnace gas adsorbs desulfurated device, the device include that blast furnace gas is discharged the back through 11 tops of blast furnace by first commodity circulation passageway 1, gets into gravity dust remover 12, and the coarse dust removal of formation gets into dry process sack cleaner 13 by second commodity circulation passageway 2, forms to third commodity circulation passageway 3 after removing dust, and particulate matter content is for being less than 5mg/Nm3. The third material flow channel 3 is coordinately controlled by the pressure regulating valve group, part of the third material flow channel is used for surplus pressure by the TRT surplus pressure generating device 14, and part of the third material flow channel is formed to the fourth material flow channel 4 by the pressure regulating valve group 31. Before entering the desulfurization tower group I19 or the tower group II22, the temperature of the fourth material flow channel 4 is 25 ℃, and the total content of sulfide is 160-220mg/Nm3In which the majority of the sulfides are organic sulfides COS and inorganic sulfides H2The S form exists.
As shown in the attached figure 1, the tower group I19 and the tower group II22 both have two states, namely an adsorption fine desulfurization working state and a thermal desorption state. And the tower group in the adsorption fine desulfurization working state adsorbs and desulfurizes the fourth material flow channel 4 of the blast furnace gas until the adsorbent is saturated. The tower set in the thermal desorption state is divided into two stages, wherein the first stage is thermal desorption of the adsorbent, and the second stage is cooling of the adsorbent after the thermal desorption.
As shown in the attached figure 1, the tower group I19 and the tower group II22 work alternately and are divided into the following two working conditions:
in case 1, the column group I19 is in the above-mentioned adsorption fine desulfurization operation state, and the column group II22 is in the above-mentioned adsorbent thermal desorption state. The seventh, eighth, first, and second flow control valves 29, 30, 17, and 18 of the valve block are opened, and the third, fourth, fifth, and sixth flow control valves 25, 26, 27, and 28 of the valve block are closed. The fourth material flow passage 4 passes through a first flow control valve 17, is adsorbed, refined, desulfurized and purified by a tower group I19 and passes through a second flow control valve 18 to form a fifth material flow passage 5 of clean coal gas. A part of the fifth material flow channel 5 is branched into a sixth material flow channel 6, and the sixth material flow channel 6 enters a tower group II22 for thermal desorption after being heated; the rest part is shunted to a ninth material flow channel 9, and the ninth material flow channel 9 is sent to the gas users in the plant area. The sixth material flow channel 6 is led into a heat exchanger 16 by a conveying fan 15, steam enters the heat exchanger 16 for assisting heating through a steam pipeline 10, clean coal gas heated to 180-fold temperature and 280 ℃ enters a tower group II22 through a seventh material flow channel 7 through a seventh flow control valve 29 to thermally desorb the adsorbent and is discharged through an eighth flow control valve 30, and an eighth material flow channel 8 is formed and sent to a plant area sintering section for use.
In case 2, the column group II22 is in the above-mentioned adsorption fine desulfurization operation state, and the column group I19 is in the above-mentioned adsorbent thermal desorption state. The valve block third, fourth, fifth, and sixth flow control valves 25, 26, 27, and 28 are opened, and the valve block seventh, eighth, first, and second flow control valves 29, 30, 17, and 18 are closed. The fourth material flow passage 4 passes through a third flow control valve 25, is adsorbed, refined, desulfurized and purified by a tower group II22 and passes through a fourth flow control valve 26 to form clean coal gas which is sent to a fifth material flow passage 5. A part of the fifth material flow channel 5 is branched into a sixth material flow channel 6, and the sixth material flow channel 6 enters a tower group I19 for thermal desorption after being heated; the rest part is shunted to a ninth material flow channel 9, and the ninth material flow channel 9 is sent to the gas users in the plant area. The sixth material flow channel 6 is led into a heat exchanger 16 by a conveying fan 15, steam enters the heat exchanger 16 for assisting heating through a steam pipeline 10, clean coal gas heated to 180-fold temperature and 280 ℃ enters a tower group I19 for thermally desorbing the adsorbent through a seventh material flow channel 7 through a fifth flow control valve 27 and is discharged through a sixth flow control valve 28, and an eighth material flow channel 8 is formed and sent to a plant area sintering section for use.
Case 1 above, when column I19 is saturated with adsorbent, the process switches to case 2. When case 2 tower group II22 is saturated with adsorption, the procedure switches to case 1. The two conditions are circularly carried out, and the continuous operation of the adsorption fine desulfurization production line is realized.
The above-mentioned eighth material flow channel 8 is sent to the sintering section of the existing end flue gas desulfurization device in the plant area for use.
The adsorption fine desulfurization tower, namely, the tower IA20 and the tower IB21 of the tower group I19 in case 1; case 2- -column IIA23 and column IIB24 of column group II22, the desulfurizer filler for desulfidation in the column is one or a combination of several of molecular sieve, activated alumina and zeolite.
When the tower set is in the adsorption fine desulfurization working state, namely the case 1, namely the tower set I19; case 2- -column group II22, the inlet pattern was from bottom to top.
Referring to fig. 1, the adsorbent packing layer in the tower set is divided into two layers, an upper layer and a lower layer, when the tower set is in an adsorption fine desulfurization working state, coal gas passes through the guide plate through an inlet below the tower set, then passes through the adsorbent packing layer, and then passes through the (adsorbent) packing layers from bottom to top. Preferably, the main component of the lower layer of the packing layer is a molecular sieve, and the main component of the upper layer of the packing layer is modified activated alumina.
In the adsorption fine desulfurization tower IA20, the tower IB21, the tower IIA22 and the tower IIB24, the desulfurizer filler for removing sulfides in the tower is one or a combination of a plurality of molecular sieves, active alumina and zeolite, and further, the lower component of the (adsorbent) filler layer is mainly the molecular sieve, and also contains the active alumina and the zeolite; the upper layer of the packing layer mainly comprises modified active alumina, molecular sieve and zeolite.
Still further, the desulfurizer filler is at least one of 3A type molecular sieve, 4A type molecular sieve, 5A type molecular sieve, 13X type molecular sieve, RK-29HP molecular sieve, RK-29II molecular sieve, SG-731 activated alumina, RK-33 molecular sieve and AZ-300 conforming molecular sieve.
When the tower set is in a thermal desorption working state, clean coal gas enters the tower from a desorption gas inlet at the upper end of the tower and above the packing layer, the packing layer is heated, and the adsorbent slowly releases sulfide attached to the adsorbent. The sulfide is carried by the thermal desorption gas and is discharged from an outlet which is positioned at the lower end of the tower and below the adsorbent packing layer, and thermal desorption product gas is formed.
In summary, the prior art describes that the existing blast furnace gas desulfurization process is as follows: the carbonyl sulfide in the blast furnace gas is catalyzed, hydrolyzed or hydrogenolyzed into hydrogen sulfide, and then alkali liquor is sprayed to remove the hydrogen sulfide. The disadvantages of the process are as follows: the investment of repeatedly heating and cooling blast furnace gas, the investment of an alkali liquor system, the strict requirements of the catalyst on the content of water and carbon dioxide in the gas, the easy inactivation of the catalyst and the like. The utility model discloses a blast furnace gas adsorbs desulfurated device. The utility model discloses the structure is ingenious, include: dedusting blast furnace gas, utilizing residual pressure, adsorbing and desulfurizing in a tower, conveying clean gas to plant gas users, thermally desorbing an adsorbent in the tower, and conveying desorbed mixed gas to a workshop section of existing tail-end flue gas desulfurization equipment in a plant area for use. The utility model solves the problem of blast furnace gas desulfurization, in particular to the removal of carbonyl sulfide and the reduction of total sulfide to 25mg/Nm3The following. The problem that the sulfur dioxide emission in a blast furnace gas burning workshop section exceeds the standard is solved, and the investment of a plurality of flue gas desulfurization devices required in the original workshop section is saved.
Claims (4)
1. The utility model provides a device of blast furnace gas adsorption desulfurization which characterized in that: the system comprises a gravity dust collector (12), a dry-method bag-type dust collector (13), a TRT (blast furnace top gas recovery turbine) residual pressure power generation device (14), a pressure regulating valve bank (31), an adsorption fine desulfurization tower, a heat exchanger (16), a conveying fan (15), valve banks and connecting pipelines;
the adsorption fine desulfurization towers are 4 in number and are divided into a tower group I (19) and a tower group II (22)2, wherein the tower group I (19) comprises a tower IA (20) and a tower IB (21) which are juxtaposed, and the tower group II (22) comprises a tower IIA (23) and a tower IIB (24) which are juxtaposed;
the valve group comprises a first flow control valve (17), a second flow control valve (18), a third flow control valve (25), a fourth flow control valve (26), a fifth flow control valve (27), a sixth flow control valve (28), a seventh flow control valve (29) and an eighth flow control valve (30);
the connecting pipeline comprises a first material flow channel (1), a second material flow channel (2), a third material flow channel (3), a fourth material flow channel (4), a fifth material flow channel (5), a sixth material flow channel (6), a seventh material flow channel (7), an eighth material flow channel (8), a ninth material flow channel (9) and a steam pipeline (10);
the inlet of the adsorption fine desulfurization tower comprises a gas uniform distributor, and an adsorbent packing layer is arranged in the adsorption fine desulfurization tower;
the output end of the blast furnace (11) is sequentially provided with a first material flow channel (1), a gravity dust collector (12), a second material flow channel (2), a dry-method bag-type dust collector (13) and a third material flow channel (3), and the output end of the third material flow channel (3) is connected with a pressure regulating valve bank (31) and a TRT (blast furnace top pressure recovery turbine) residual pressure power generation device (14) in parallel; the pressure regulating valve group (31), the fourth material flow channel (4) is connected to TRT (Top pressure recovery turbine) residual pressure power generation device (14) output, the output of fourth material flow channel (4) is parallelly connected and is provided with tower group I (19), tower group II (22), the input of tower group I (19) sets up first flow control valve (17), the input of tower group II (22) sets up third flow control valve (25), tower group I (19), the output of tower group II (22) all sets up first, the second passageway, tower group I (19), the first passageway of tower group II (22) and to seventh material flow channel (7), tower group I (19), the second passageway of tower group II (22) and to fifth material flow channel (5), tower group I (19), the output of the first passageway of tower group II (22) is divided and is established fifth flow control valve (27), seventh flow control valve (29), tower group I (19), the output of the second passageway of tower group II (22) is divided and is established second flow control valve (18), The output ends of the tower group I (19) and the tower group II (22) are also provided with third channels, and the output ends of the third channels of the tower group I (19) and the tower group II (22) are respectively provided with a sixth flow control valve (28) and an eighth flow control valve (30); the output end of the seventh material flow channel (7) is provided with a heat exchanger (16); a ninth material flow channel (9) is arranged at the output end of the fifth material flow channel (5), a sixth material flow channel (6) is arranged between the heat exchanger (16) and the input end of the ninth material flow channel (9), and a conveying fan (15) is arranged on the sixth material flow channel (6); the steam pipeline (10) is arranged on the heat exchanger (16).
2. The apparatus for adsorptive desulfurization of blast furnace gas according to claim 1, wherein: the absorbent packing layer in the tower set of the absorption fine desulfurization tower is divided into two layers, namely an upper layer and a lower layer.
3. The apparatus for adsorptive desulfurization of blast furnace gas according to claim 2, characterized in that: the gas uniform distributor is a guide plate distributed at the low-pressure blast furnace gas inlet at the bottom of the adsorption fine desulfurization tower.
4. The apparatus for adsorptive desulfurization of blast furnace gas according to claim 1, wherein: the valve group is a flow limiting valve.
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