CN211367498U - Blast furnace gas desulfurization and alkali spraying treatment system - Google Patents
Blast furnace gas desulfurization and alkali spraying treatment system Download PDFInfo
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- CN211367498U CN211367498U CN201922197642.6U CN201922197642U CN211367498U CN 211367498 U CN211367498 U CN 211367498U CN 201922197642 U CN201922197642 U CN 201922197642U CN 211367498 U CN211367498 U CN 211367498U
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Abstract
The utility model relates to a blast furnace gas desulfurization and alkali processing system spouts, including the heat exchanger, the heater, spout alkali tower and adsorption tower, the adsorption tower is filled with the purification medium, the air inlet of adsorption tower loops through blast furnace gas inlet branch pipe and blast furnace gas inlet main pipe and is connected with TRT, the gas outlet of adsorption tower loops through clean coal gas outlet branch pipe and is given vent to anger the person in charge with clean coal gas and be connected, the regeneration gas export of heater loops through regeneration desorption gas inlet main pipe and regeneration desorption gas inlet branch pipe and is connected with the gas outlet of adsorption tower, the regeneration gas entry of heater and the regeneration gas exit linkage of heat exchanger, the regeneration gas entry and the clean coal gas of heat exchanger are given vent to anger and are responsible for being connected, the air inlet of alkali tower is connected with the air inlet of adsorption tower, the gas outlet and the. The utility model solves the technical problem of poor gas purification effect in blast furnace gas.
Description
Technical Field
The utility model relates to a coal gas desulfurization technical field especially relates to a blast furnace gas desulfurization and alkali spraying treatment system.
Background
Blast furnace gas is a main byproduct generated in an iron-making process flow and is colorless and tasteless combustible gas. The theoretical combustion temperature is 1400-1500 ℃, and the ignition point is about 700 ℃. The blast furnace gas is characterized by low heat value (3300-4200 kJ/Nm)3) And the gas production is large, and the gas is easy to explode when being mixed with air. The main components of blast furnace gas are: 25 to 30 percent of CO; h21.5％～3.0％；CH40.2％～0.5％；N255％～60％；CO 29％～12％；O20.2％～0.4％。
In the last decade, with blast furnace gas dry processesThe common application of the bag-type dust removal and the blast furnace gas residual pressure turbine power generation device (TRT) fully recovers the pressure energy and the heat energy of the blast furnace gas. The blast furnace gas after pressure energy and heat energy are recovered by the residual pressure turbine power generation device is sent to users such as hot blast stoves, heating furnaces, coke ovens, boilers, sintering, pellets and the like to be used as fuel. After the blast furnace gas is combusted, sulfur in the discharged gas is mainly in the form of SO2The content is 45-185 mg/m3The exhaust is carried out after the purification reaches the standard, and the limit value of the particulate matter exhaust after the blast furnace gas combustion is 10mg/m along with the strict requirement of environmental protection3SO in gas2Emission limit of 35mg/m3Emission limit of nitrogen oxides of 50mg/m3. The traditional desulfurization method is to perform desulfurization on coal gas, mainly adopts the processes of a calcium method, a magnesium method, a sodium method, an ammonia method, an organic alkali method and the like, but compared with blast furnace gas, the volume of the combusted coal gas is increased, the temperature is high, the pressure is low, so that a coal gas desulfurization device is huge, the water consumption is high, circulating water needs to be treated separately, and the defects of high desulfurization cost, secondary pollution and the like are caused. The method for treating the blast furnace gas source is mainly to adopt the traditional wet scrubbing desulfurization after the residual pressure turbine power generation device, wherein H is2S、SO2Etc. are easy to be removed, and COS and CS in blast furnace gas2The SO in the gas after the combustion of the blast furnace gas is not easy to remove2The content is still out of limits. At present, most of the purification of the gas in the blast furnace gas, especially the removal of sulfides, has the defects of complex system structure, complex operation and control, poor purification effect and the like, and no economical and feasible method and equipment exist in the purification process of the blast furnace gas.
Aiming at the problem of poor purification effect of coal gas in blast furnace gas in the related art, no effective solution is provided at present.
Therefore, the inventor provides a blast furnace gas desulfurization and alkali spraying treatment system by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a blast furnace gas desulfurization and alkali spraying treatment system, purifying effect is good, has the advantage that structure and operation flow are simple, with low costs, no secondary pollution.
The purpose of the utility model can be realized by adopting the following technical scheme:
the utility model provides a blast furnace gas desulfurization and spout alkali processing system, blast furnace gas desulfurization and spout alkali processing system include heat exchanger, heater, spout alkali tower and a plurality of adsorption towers, wherein:
purifying media are filled in each adsorption tower, the air inlet of each adsorption tower is respectively connected with one end of a corresponding blast furnace gas inlet branch pipe, the other end of each blast furnace gas inlet branch pipe is connected with a blast furnace gas inlet main pipe, the blast furnace gas inlet main pipe is connected with a gas outlet of a TRT, the gas outlet of each adsorption tower is respectively connected with one end of a corresponding clean gas outlet branch pipe, and the other end of each clean gas outlet branch pipe is connected with the clean gas outlet main pipe;
a regenerated gas outlet of the heater is connected with one end of a regenerated desorption gas inlet main pipe, the other end of the regenerated desorption gas inlet main pipe is connected with one end of a plurality of regenerated desorption gas inlet branch pipes, the other end of each regenerated desorption gas inlet branch pipe is connected with a corresponding gas outlet of the adsorption tower, a regenerated gas inlet of the heater is connected with a regenerated gas outlet of the heat exchanger, a regenerated gas inlet of the heat exchanger is connected with one end of a first clean gas return pipe, the other end of the first clean gas return pipe is connected with the clean gas outlet main pipe, the first clean gas return pipe is connected with one end of a second clean gas return pipe, and the other end of the second clean gas return pipe is connected with the regenerated desorption gas inlet main pipe;
the gas inlet of the alkali spraying tower is connected with one end of a desorption and desorption gas outlet main pipe, the other end of the desorption and desorption gas outlet main pipe is connected with one end of a plurality of desorption and desorption gas outlet branch pipes, the other end of each desorption and desorption gas outlet branch pipe is connected with the corresponding gas inlet of the adsorption tower, the gas outlet of the alkali spraying tower is connected with one end of a third clean gas return pipe, and the other end of the third clean gas return pipe is connected with the blast furnace gas inlet main pipe.
In a preferred embodiment of the present invention, the blast furnace gas inlet branch pipe is provided with a first valve, and the clean gas outlet branch pipe is provided with a third valve.
In a preferred embodiment of the present invention, the fifth valve is disposed on the main pipe for the regeneration desorption gas inlet, the fourth valve is disposed on the branch pipe for the regeneration desorption gas inlet, and the eighth valve and the seventh valve are sequentially disposed on the first return pipe for clean gas between the main pipes for the clean gas outlet, and the sixth valve is disposed on the second return pipe for clean gas.
The utility model discloses an in a preferred embodiment, be provided with the regeneration gas fan on the first clean gas muffler, the regeneration gas fan is located the eighth valve with between the seventh valve, the second clean gas muffler is connected the eighth valve with on the first clean gas muffler between the regeneration gas fan.
The present invention provides a preferable embodiment, the desorption gas is provided with a ninth valve on the main pipe, the desorption gas is provided with a second valve on the branch pipe, and the third clean gas return pipe is provided with a tenth valve.
In a preferred embodiment of the present invention, the air inlet of the adsorption tower is located in the lower part of the adsorption tower, the air outlet of the adsorption tower is located in the top of the adsorption tower, and the purification medium is filled in the air inlet of the adsorption tower and between the air outlets of the adsorption tower.
In a preferred embodiment of the present invention, the blast furnace gas inlet main pipe is provided with a spray cooling device for reducing the temperature of the gas in the pipe.
In a preferred embodiment of the present invention, the heat exchanger is a steam heat exchanger.
In a preferred embodiment of the present invention, the heater is a constant temperature heater.
In a preferred embodiment of the present invention, the inside of the alkali spraying tower is provided with a water spraying layer, an alkali spraying layer and a water washing layer in sequence from bottom to top, wherein the water spraying layer is provided with the alkali spraying layer and the water washing layer is provided with a spraying device.
In a preferred embodiment of the present invention, the air inlet of the alkali spraying tower is disposed at the bottom of the alkali spraying tower, the air outlet of the alkali spraying tower is disposed at the top of the alkali spraying tower, the water spraying layer, the alkali spraying layer and the flushing layer are disposed between the air inlet of the alkali spraying tower and the air outlet of the alkali spraying tower.
In a preferred embodiment of the present invention, the bottom of the alkali spraying tower is provided with a waste water outlet, and the waste water outlet of the alkali spraying tower is connected to the salt extracting device.
In a preferred embodiment of the present invention, the purification medium is a hydrophobic microcrystalline material.
In a preferred embodiment of the present invention, the hydrophobic microcrystalline material is a zinc-modified ZSM-5 molecular sieve material or a copper-modified ZSM-5 molecular sieve material, and the silica-alumina ratio of the molecular sieve material is 150; and a ZSM-type molecular sieve adsorbent.
In a preferred embodiment of the present invention, at least one of the adsorption towers is a spare adsorption tower.
From the above, the utility model discloses a blast furnace gas desulfurization and alkali processing system's characteristics and advantage are: the purification medium is filled in the adsorption tower, and the impurities such as hydrogen sulfide, organic sulfur and the like in the blast furnace gas are adsorbed and removed through the purification medium, so that the influence of water contained in the blast furnace gas on sulfur removal is reduced, and the adsorption efficiency of sulfur-containing impurities is improved. The regenerated gas outlet of the heater is connected with the gas outlet of the adsorption tower, the regenerated gas inlet of the heater is connected with the regenerated gas outlet of the heat exchanger, the regenerated gas inlet of the heat exchanger is connected with the purified gas outlet main pipe, the gas inlet of the adsorption tower is connected with the gas inlet of the alkali spraying tower, the gas outlet of the alkali spraying tower is connected with the blast furnace gas inlet main pipe, the purified blast furnace gas in the purified gas outlet main pipe is used as the regenerated gas to enter the adsorption tower, the purification medium can be desorbed and regenerated under the heating action of the regenerated gas and can be used for in-situ catalytic conversion of organic sulfur into inorganic sulfurRegeneration gas and inorganic sulfur (mostly H)2S) desorption gas is mixed and is formed desorption gas and discharge to spraying the alkali tower in, through the spraying treatment of spraying the alkali tower, get rid of inorganic sulphur and solid-state impurity etc. in the desorption gas, carry the salt to the waste liquid and handle, the sulphur resource that contains in the blast furnace gas obtains fully retrieving, reaches the purpose to the high-efficient sulphur removal of blast furnace gas, the utility model discloses simple structure, sulphur removal convenient operation, the secondary pollution can be avoided to the energy saving. In addition, cooperate through heat exchanger and heater and heat the intensification and handle the regeneration gas, need not extra regulation and control and detect and can guarantee to heat the regeneration gas to predetermineeing the temperature, control the convenience, guarantee the abundant desorption of sulphide, organic sulphur can fully turn into inorganic sulphur to in desorption to the desorption gas, in order to guarantee to reach abundant desulfurization effect.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: is a structural schematic diagram of the blast furnace gas desulfurization and alkali spraying treatment system of the utility model.
The utility model provides a reference numeral:
1. an adsorption tower; 2. a blast furnace gas inlet main pipe;
201. a blast furnace gas inlet branch pipe; 3. A heat exchanger;
4. spraying an alkali tower; 401. Spraying a water layer;
402. spraying an alkali layer; 403. Washing the water layer;
5. a regeneration gas fan; 6. A spray cooling device;
7. a clean gas outlet main pipe; 701. A clean gas outlet branch pipe;
8. a main regenerative desorption gas inlet pipe; 801. A regeneration desorption gas inlet branch pipe;
9. desorbing desorption gas outlet main pipe; 901. A desorption gas outlet branch pipe;
10. a heater; 11. TRT;
12. a gas purifying user; 13. A salt extraction device;
14. a second clean gas return pipe; 15. A first clean gas return pipe;
16. a third clean gas return pipe; v1, first valve;
v2, second valve; v3, third valve;
v4, fourth valve; v5, fifth valve;
v6, sixth valve; v7, seventh valve;
v8, eighth valve; v9, ninth valve;
v10, tenth valve.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a blast furnace gas desulfurization and alkali spraying treatment system, this blast furnace gas desulfurization and alkali spraying treatment system include heat exchanger 3, heater 10, alkali spraying tower 4 and a plurality of adsorption towers 1, wherein: each adsorption tower 1 is internally provided with a packing layer filled with a purification medium, the air inlet of each adsorption tower 1 is respectively connected with one end of a corresponding blast furnace gas inlet branch pipe 201, the other end of each blast furnace gas inlet branch pipe 201 is connected with a blast furnace gas inlet main pipe 2, the blast furnace gas inlet main pipe 2 is connected with the gas outlet of a TRT (blast furnace gas residual pressure turbine power generation device) 11, the air outlet of each adsorption tower 1 is respectively connected with one end of a corresponding clean gas outlet branch pipe 701, the other end of each clean gas outlet branch pipe 701 is connected with a clean gas outlet main pipe 7, and the other end of the clean gas outlet main pipe 7 is connected with a clean gas user 12 in a subsequent section. The regeneration gas outlet of the heater 10 is connected with one end of a regeneration desorption gas inlet main pipe 8, the other end of the regeneration desorption gas inlet main pipe 8 is connected with one end of a plurality of regeneration desorption gas inlet branch pipes 801, the other end of each regeneration desorption gas inlet branch pipe 801 is connected with the corresponding gas outlet of the adsorption tower 1, the regeneration gas inlet of the heater 10 is connected with the regeneration gas outlet of the heat exchanger 3, the regeneration gas inlet of the heat exchanger 3 is connected with one end of a first clean gas return pipe 15 through a gas pipe, the other end of the first clean gas return pipe 15 is connected with a clean gas outlet main pipe 7, the first clean gas return pipe 15 is connected with one end of a second clean gas return pipe 14, and the other end of the second clean gas return pipe 14 is connected with the regeneration desorption gas inlet main pipe 8. The gas inlet of the alkali spraying tower 4 is connected with one end of the desorption and desorption gas outlet main pipe 9, the other end of the desorption and desorption gas outlet main pipe 9 is connected with one end of a plurality of desorption and desorption gas outlet branch pipes 901, the other end of each desorption and desorption gas outlet branch pipe 901 is connected with the corresponding gas inlet of the adsorption tower 1, the gas outlet of the alkali spraying tower 4 is connected with one end of a third clean gas return pipe 16, and the other end of the third clean gas return pipe 16 is connected with the blast furnace gas inlet main pipe 2.
The utility model discloses be filled with the purification medium in adsorption tower 1, adsorb impurity such as hydrogen sulfide and organic sulfur in the desorption blast furnace gas through the purification medium, reduce the influence of moisture in the blast furnace gas to the sulphur removal, improve the adsorption efficiency to containing sulphur impurity. A regenerated gas outlet of the heater 10 is connected with a gas outlet of the adsorption tower 1, a regenerated gas inlet of the heater 10 is connected with a regenerated gas outlet of the heat exchanger 3, a regenerated gas inlet of the heat exchanger 3 is connected with a purified gas outlet main pipe 7, a gas inlet of the adsorption tower 1 is connected with a gas inlet of the alkali spraying tower 4, a gas outlet of the alkali spraying tower 4 is connected with a blast furnace gas inlet main pipe 2, purified blast furnace gas in the purified gas outlet main pipe 7 is used as regenerated gas to enter the adsorption tower 1, a purification medium can be desorbed and regenerated under the heating action of the regenerated gas and can be used for in-situ catalytic conversion of organic sulfur into inorganic sulfur, the regenerated gas and the inorganic sulfur (most of H is H)2S) desorption gas is mixed and is formed desorption gas and discharge to spouting in the alkali tower 4, through the spray treatment of spouting alkali tower 4, gets rid of inorganic sulphur and solid-state impurity etc. in the desorption gas, carries the salt to the waste liquid and handles, and the sulphur resource that contains in the blast furnace gas obtains fully retrieving, reaches the purpose to the high-efficient sulphur removal of blast furnace gas, the utility model discloses simple structure, sulphur removal convenient operation, the energy saving can avoid secondary pollution. In addition, the heat exchanger 3 is matched with the heater 10 to heat and heat the regenerated gas, and no additional regulation is neededAnd detect and can guarantee to heat the regeneration gas to predetermineeing the temperature, control the convenience, can guarantee that hydrophobic type microcrystalline material adsorbed organic sulfur can fully turn into inorganic sulfur to in desorption to desorption gas, in order to guarantee to reach abundant desulfurization's effect.
Specifically, as shown in fig. 1, a first valve V1 is provided on the blast furnace gas inlet branch pipe 201, and a third valve V3 is provided on the clean gas outlet branch pipe 701. The main regeneration desorption gas inlet pipe 8 is provided with a fifth valve V5, the branch regeneration desorption gas inlet pipe 801 is provided with a fourth valve V4, the first clean gas return pipe 15 between the regeneration gas inlet of the heat exchanger 3 and the main clean gas outlet pipe 7 is sequentially provided with an eighth valve V8 and a seventh valve V7, and the second clean gas return pipe 14 is provided with a sixth valve V6. The first clean gas return pipe 15 is provided with a regenerated gas fan 5, the regenerated gas fan 5 is positioned between the eighth valve V8 and the seventh valve V7, and the second clean gas return pipe 14 is connected to the first clean gas return pipe 15 between the eighth valve V8 and the regenerated gas fan 5. The main desorption gas outlet pipe 9 is provided with a ninth valve V9, the branch desorption gas outlet pipe 901 is provided with a second valve V2, and the third clean gas return pipe 16 is provided with a tenth valve V10. The on-off of the corresponding pipeline is controlled by controlling the opening and closing states of the valves, so that the desulfurization of the blast furnace gas is completed.
Furthermore, a temperature detection device is arranged in the packing layer, the temperature of the purification medium can be detected in real time through the temperature detection device, and the temperature of the packing layer can be adjusted according to the requirement.
The temperature detecting device may be, but is not limited to, a temperature sensor.
Further, the inner diameter of the adsorption column 1 is 4m to 8 m.
In the utility model, the purifying medium is a hydrophobic microcrystal material.
Furthermore, the hydrophobic microcrystalline material can be made of a material containing at least one element of magnesium, calcium, strontium, yttrium, lanthanum, cerium, europium, iron, cobalt, nickel, copper, silver, zinc and the like; specifically, the hydrophobic microcrystalline material is selected from X-type molecular sieve, Y-type molecular sieve, A-type molecular sieve, ZSM-type molecular sieve and silkAt least one of mordenite, β type molecular sieve, MCM type molecular sieve and SAPO type molecular sieve, wherein the catalyst for converting organic sulfur into inorganic sulfur comprises Fe-Co-Mn-Mo-Ni catalyst, CO-K-Al2O3、ZrO2/TiO2At least one of catalysts; and in practical implementation, the amount of the catalyst can be reasonably set by a person skilled in the art according to the field operation requirement.
Furthermore, the hydrophobic microcrystalline material is made of a zinc-modified ZSM-5 molecular sieve material or a copper-modified ZSM-5 molecular sieve material, and the silicon-aluminum ratio of the molecular sieve material is 150; the hydrophobic microcrystalline material contains ZSM molecular sieve adsorbent, etc., and contains Co-Mo-Ni catalyst.
Specifically, as shown in fig. 1, an air inlet of the adsorption tower 1 is located at the lower part of the adsorption tower 1, an air outlet of the adsorption tower 1 is located at the top of the adsorption tower 1, a purification medium is filled between the air inlet of the adsorption tower 1 and the air outlet of the adsorption tower 1, blast furnace gas enters the adsorption tower 1 from the air inlet at the lower part of the adsorption tower 1 and passes through the purification medium from bottom to top, and after impurities such as hydrogen sulfide and organic sulfur in the blast furnace gas are sufficiently adsorbed by the purification medium, the obtained purified blast furnace gas is discharged through the air outlet at the top of the adsorption tower 1.
Further, as shown in fig. 1, a spray cooling device 6 for reducing the temperature of the gas in the blast furnace gas inlet main pipe 2 between the third clean gas return pipe 16 and the blast furnace gas inlet branch pipe 201 is provided. Before entering the adsorption tower 1, the blast furnace gas is cooled by the spray cooling device 6, so that the interior of the adsorption tower 1 is kept at a temperature with stronger adsorption capacity of a purification medium, and the optimal adsorption effect on impurities such as hydrogen sulfide, organic sulfur and the like is achieved.
Further, the spray cooling device 6 may be, but is not limited to, a plurality of atomization nozzles disposed on the blast furnace gas inlet main 2.
Further, the heat exchanger 3 is a steam heat exchanger, and the heater 10 is a constant temperature heater. In the process of heating the regenerated gas, firstly, the regenerated gas is preliminarily heated through a steam heat exchanger, the regenerated gas after preliminary heating enters a constant temperature heater for secondary heating, the constant temperature heater is adjusted to a constant temperature heating range of 160-350 ℃, the purification medium in the adsorption tower 1 can be ensured to be desorbed and regenerated, if the steam quantity introduced into the steam heat exchanger is small, the temperature of the regenerated gas after passing through the steam heat exchanger cannot reach the preset temperature, the secondary heating can be carried out through a heater 10, and the temperature of the regenerated gas can be ensured to reach 160-350 ℃; if the steam volume that lets in steam heat exchanger is too big, and the temperature of the regeneration gas behind the steam heat exchanger surpasss preset temperature, then the regeneration gas can play the effect of the temperature regulation of certain degree at the in-process through heater 10 to make the temperature of regeneration gas drop to 160 ~ 350 ℃ within range, guarantee that the desorption regeneration of purifying medium goes on smoothly.
Further, as shown in fig. 1, an air inlet of the alkali spraying tower 4 is arranged at the bottom of the alkali spraying tower 4, an air outlet of the alkali spraying tower 4 is arranged at the top of the alkali spraying tower 4, a water spraying layer 401, an alkali spraying layer 402 and a flushing water layer 403 are sequentially arranged between the air inlet of the alkali spraying tower 4 and the air outlet of the alkali spraying tower 4 from bottom to top, and the water spraying layer 401, the alkali spraying layer 402 and the flushing water layer 403 are all provided with a spraying device. The bottom of the alkali spraying tower 4 is provided with a waste water outlet, and the waste water outlet of the alkali spraying tower 4 is connected with a salt extraction device 13. The alkaline solution sprayed out through the water spraying layer 401 and the alkali spraying layer 402 and the H in the desorption gas2S and other inorganic sulfur impurities react, meanwhile, substances such as chlorine and metal ions in the desorption gas can be removed, and the generated salt-containing wastewater is conveyed to the salt extraction device 13.
Further, a dehydration device for removing mechanical water containing various ions is provided inside the alkali spray tower 4, and the dehydration device is located above the rinsing water layer 403.
Further, the spraying device may be, but is not limited to, a plurality of spray heads.
Further, the salt extraction device 13 may be, but is not limited to, an MVR (mechanical vapor recompression) salt extraction device.
Further, at least one of the adsorption columns 1 is a spare adsorption column.
The utility model discloses a basic operating principle does: the sulfur content of the TRT11 externally discharged blast furnace gas is 40-160 mg/m3Of inorganic sulfur (most of which are H)2S)The content is 10-50 mg/m3Organic sulfur content of 80-150 mg/m3The temperature of the blast furnace gas is reduced to 40-60 ℃ through a spray cooling device 6, and then the gas enters an adsorption tower 1 filled with hydrophobic microcrystalline material, wherein H in the blast furnace gas2S, etc. inorganic sulfur, COS and CS2The organic sulfur and other impurities are absorbed by the hydrophobic microcrystalline material in the absorption tower 1, and the sulfur content in the absorbed blast furnace gas is less than 20mg/m3And is conveyed to subsequent working sections for treatment through the main clean gas outlet pipe 7 and the branch clean gas outlet pipe 701 in sequence. Wherein, the quantity of adsorption tower 1 is more than or equal to 2, and at least 1 is reserve adsorption tower, and the hydrophobic type microcrystalline material that loads in adsorption tower 1 possesses stronger adsorption efficiency when the temperature is 20 ~ 80 ℃, and it can desorption regeneration at 160 ~ 350 ℃, and organic sulfur that is adsorbed is by normal position catalytic conversion inorganic sulfur during regeneration. And after the adsorption of all the adsorption towers 1 reaches the preset saturation threshold, starting the standby adsorption tower, and performing regeneration operation on the adsorption tower 1 with the adsorption reaching the saturation threshold. Wherein the regeneration operation is: the regeneration gas fan 5 extracts a small amount of clean blast furnace gas from the clean gas outlet main pipe 7, the clean blast furnace gas passes through the first clean gas return pipe 15 and then is subjected to double heating of the heat exchanger 3 and the heater 10 in sequence, the regeneration gas is heated to 160-350 ℃, and then the regeneration gas passes through the regeneration desorption gas inlet main pipe 8 and each regeneration desorption gas inlet branch pipe 801 in sequence and enters each adsorption tower 1. The regeneration process of the adsorption tower 1 is divided into three processes of temperature rise, heat preservation and cold blowing, the regeneration time of each adsorption tower 1 is about 60 hours, in the regeneration process, inorganic sulfur, impurities and the like adsorbed by the hydrophobic microcrystalline material are desorbed into desorption gas, and organic sulfur in the inorganic sulfur is converted into H2S and other inorganic sulfur are desorbed into desorption gas, the desorption gas mixed with the inorganic sulfur and impurities in the adsorption tower 1 is called desorption gas, and the desorption gas mainly contains H2S and impurities, the general regeneration process needs 1-5 days, preferably 3 days, desorption and desorption gas in the adsorption tower 1 sequentially passes through the desorption and desorption gas outlet branch pipe 901 and the desorption and desorption gas outlet main pipe 9 to enter the alkali spraying tower 4, and at the moment, a regeneration gas fan 5 extracts a large amount of clean blast furnace gas (coke oven gas or converter gas can also be adopted) from the clean gas outlet main pipe 7 and sequentially passes through the first clean gasThe air return pipe 15, the second clean gas air return pipe 14, the main regeneration desorption gas inlet pipe 8 and each branch regeneration desorption gas inlet pipe 801 enter each adsorption tower 1 for cold blowing, so that the temperature in the adsorption tower 1 is reduced to 20-80 ℃. The desorption gas entering the alkali spraying tower 4 is subjected to spray treatment, and H in the desorption gas is desorbed2S is absorbed and converted, meanwhile, chlorine, metal ions and other substances in the coal gas can be removed, part of mechanical water containing multiple ions is removed through a dehydration device, the mechanical water is discharged from an alkali spraying tower 4 to a blast furnace gas inlet main pipe 2 to be desulfurized again, spray water in the alkali spraying tower 4 naturally dissipates heat and can be reused after being collected, the pH value of condensate water in the alkali spraying tower 4 is detected in real time, the pH value is controlled to be 6.5-7.5, the addition amount of alkali liquor is adjusted through the detected pH value, and salt-containing wastewater in the alkali spraying tower 4 is discharged to a salt extracting device 13 to be subjected to salt extracting treatment.
The utility model discloses carry the desorption gas in the adsorption tower 1 to spraying alkali tower 4 in and carry out the concrete operation flow who sprays the processing and do:
350000Nm as shown in FIG. 13After the blast furnace gas is subjected to TRT power generation, the total sulfur content in the blast furnace gas is less than 200mg/m3In which H is2S content of 30%, COS and CS2The content of the dust is 70 percent, the pressure of the blast furnace gas is 12-16 kPa, and the dust content is less than 10mg/m3The gas temperature was about 90 ℃. At this time, the adsorption tower 1 located at the rearmost end serves as a spare adsorption tower, the first valve V1 and the third valve V3 of each of the other adsorption towers 1 are opened, the other valves are in a closed state, the blast furnace gas passes through the blast furnace gas inlet main pipe 2, each of the blast furnace gas inlet branch pipes 201, and the gas inlet of each of the adsorption towers 1 in order, and the blast furnace gas is cooled by the spray cooling device 6 before entering the adsorption towers 1, so that the temperature is reduced to about 60 ℃. When blast furnace gas passes through the packing layer in the adsorption tower 1, H2S, etc. inorganic sulfur and organic sulfur (COS and CS)2Etc.) and impurities are absorbed by the hydrophobic microcrystalline material, and the total sulfur content of the purified blast furnace gas is less than 20mg/m3The obtained purified blast furnace gas is discharged from the gas outlet of the adsorption tower 1 to the purified gas outlet branch pipes 701, and the purified gas outlet branch pipes 701 are collected to the purified gas outlet main pipe 7 and then conveyed to the rearAnd (5) cleaning the blast furnace gas section for subsequent treatment. After 3 days of operation, the first valve V1 and the third valve V3 of the spare adsorption tower are opened, the first valve V1 and the third valve V3 of the adsorption tower 1 positioned at the frontmost end are closed, the adsorption tower 1 positioned at the frontmost end is regenerated, meanwhile, the regenerated gas fan 5 is started, the seventh valve V7, the eighth valve V8, the fifth valve V5 and the fourth valve V4 corresponding to the adsorption tower 1 positioned at the frontmost end are opened, clean blast furnace gas in the blast furnace gas inlet main pipe 2 enters the regenerated gas fan 5, the gas amount is 3000Nm3And h, pressurizing the regenerated gas by a regenerated gas fan 5 by 10kPa, and heating the pressurized regenerated gas (namely the clean blast furnace gas) by a heat exchanger 3 and a heater 10 in sequence. The heated regeneration gas enters the adsorption tower 1 at the most front end through the regeneration desorption gas inlet main pipe 8, the regeneration desorption gas inlet branch pipe 801 and the gas outlet of the adsorption tower 1 at the most front end in sequence, when the regeneration desorption gas in the adsorption tower 1 passes through the packing layer, the packing layer is heated, the packing layer is provided with a temperature detection device, the change of the temperature of the packing layer can be detected in real time, when the temperature of the packing layer reaches 200 ℃, the heat is preserved, the temperature is maintained at 180-210 ℃, and at the moment, the H adsorbed by the hydrophobic microcrystalline material2S and other inorganic sulfur and organic sulfur are desorbed, the organic sulfur is converted into inorganic sulfur in situ during desorption, the inorganic sulfur is desorbed and then enters regenerated desorption gas to be called desorption gas, and the content of hydrogen sulfide in the desorption gas is 20g/m3And also contains a small amount of organic sulfur. The desorption gas in the adsorption tower 1 at the foremost end sequentially passes through the gas inlet of the adsorption tower 1, the desorption gas outlet branch pipe 901 and the desorption gas outlet main pipe 9 to enter the alkali spraying tower 4 and sequentially passes through the alkali spraying tower 4, the alkali spraying layer 402 and the flushing water layer 403, the water spraying layer 401 is used for cooling the desorption gas, and the alkali spraying layer 402 is used for removing H in the desorption gas2And S, absorbing hydrogen sulfide, chlorine and metal ions in the desorption gas through the alkali spraying tower 4, removing mechanical water through a dehydration device in the alkali spraying tower 4, and returning the desorption gas subjected to spraying and sulfur removal to the blast furnace gas inlet main pipe 2 through a third clean gas return pipe 16. The PH value of condensed water in the alkali spraying tower 4 is controlled to be 6.5-7.5, and salt-containing wastewater discharged from the alkali spraying tower 4 is conveyed to a salt extraction device13, salt extraction treatment is carried out. After the thermal desorption of the adsorption tower 1 located at the forefront was continued for 1 day, the adsorption tower 1 was cooled. And closing the eighth valve V8 and the fifth valve V5, and simultaneously opening the sixth valve V6, so that the purified blast furnace gas enters the adsorption tower 1 at the foremost end through the main regeneration desorption gas inlet pipe 8 and the branch regeneration desorption gas inlet pipe 801 to be cooled, and the next adsorption tower 1 can be regenerated after the cooling process is finished. When it is necessary to start the regeneration of the next adsorption tower 1, the sixth valve V6, the fourth valve V4 and the second valve V2 corresponding to the adsorption tower 1 located at the forefront are closed, the first valve V1 and the third valve V3 corresponding to the adsorption tower 1 located at the forefront are opened at the same time, the first valve V1 and the third valve V3 corresponding to the next adsorption tower 1 are closed, and the process of performing the desorption regeneration on the next adsorption tower 1 is the same as the above process.
The utility model discloses blast furnace gas desulfurization and alkali processing system's characteristics and advantage are:
firstly, the adsorption tower 1 in the blast furnace gas desulfurization and alkali spraying treatment system adsorbs and removes impurities such as hydrogen sulfide and organic sulfur in the blast furnace gas, reduces the influence of water in the blast furnace gas on sulfur removal, and improves the adsorption efficiency of sulfur-containing impurities.
And secondly, the clean blast furnace gas in the clean gas outlet main pipe 7 in the blast furnace gas desulfurization and alkali spraying treatment system is heated by the heat exchanger 3 and the heater 10 in sequence and then is introduced into the adsorption tower 1 as regenerated gas, so that the required regenerated gas amount is small, the sulfur concentration in desorption gas is high, the energy consumption is low, the working cost is reduced, and the system is suitable for popularization and use.
Thirdly, the blast furnace gas desulfurization and alkali spraying treatment system contains high concentration H2The desorption gas of S is conveyed to an alkali spraying tower 4 for spraying treatment to remove H therein2S, the obtained waste liquid is subjected to salt extraction treatment, the equipment structure is simple, the operation and the control are simple and convenient, the obtained blast furnace gas can be used up to the standard, the sulfur resource can be fully recovered, the energy is saved, and no secondary pollution is caused.
Fourthly, a water spraying layer 401, an alkali spraying layer 402 and a flushing water layer 403 are arranged inside the alkali spraying tower 4 in the blast furnace gas desulfurization and alkali spraying treatment system, and the gas-liquid mixing degree can be enhanced through a three-layer spraying structure, so that a better desulfurization effect is obtained.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (15)
1. The blast furnace gas desulfurization and alkali spraying treatment system is characterized by comprising a heat exchanger (3), a heater (10), an alkali spraying tower (4) and a plurality of adsorption towers (1), wherein:
purifying media are filled in each adsorption tower (1), the air inlet of each adsorption tower (1) is respectively connected with one end of a corresponding blast furnace gas inlet branch pipe (201), the other end of each blast furnace gas inlet branch pipe (201) is connected with a blast furnace gas inlet main pipe (2), the blast furnace gas inlet main pipe (2) is connected with a gas outlet of a TRT (11), the air outlet of each adsorption tower (1) is respectively connected with one end of a corresponding clean gas outlet branch pipe (701), and the other end of each clean gas outlet branch pipe (701) is connected with a clean gas outlet main pipe (7);
a regeneration gas outlet of the heater (10) is connected with one end of a regeneration desorption gas inlet main pipe (8), the other end of the main regeneration desorption gas inlet pipe (8) is connected with one end of a plurality of branch regeneration desorption gas inlet pipes (801), the other end of each branch regeneration desorption gas inlet pipe (801) is connected with the corresponding gas outlet of the adsorption tower (1), a regeneration gas inlet of the heater (10) is connected with a regeneration gas outlet of the heat exchanger (3), a regenerated gas inlet of the heat exchanger (3) is connected with one end of a first clean gas return pipe (15), the other end of the first clean gas return pipe (15) is connected with the clean gas outlet main pipe (7), the first clean gas return pipe (15) is connected with one end of the second clean gas return pipe (14), the other end of the second clean gas return pipe (14) is connected with the main regenerative desorption gas inlet pipe (8);
the gas inlet of the alkali spraying tower (4) is connected with one end of a desorption gas outlet main pipe (9), the other end of the desorption gas outlet main pipe (9) is connected with one end of a plurality of desorption gas outlet branch pipes (901), the other end of each desorption gas outlet branch pipe (901) is connected with the corresponding gas inlet of the adsorption tower (1), the gas outlet of the alkali spraying tower (4) is connected with one end of a third clean gas return pipe (16), and the other end of the third clean gas return pipe (16) is connected with the blast furnace gas inlet main pipe (2).
2. The blast furnace gas desulfurization and alkali-spraying treatment system according to claim 1, wherein a first valve (V1) is disposed on the blast furnace gas inlet branch pipe (201), and a third valve (V3) is disposed on the clean gas outlet branch pipe (701).
3. The blast furnace gas desulfurization and alkali injection treatment system according to claim 1, wherein a fifth valve (V5) is disposed on the main regeneration desorption gas inlet pipe (8), a fourth valve (V4) is disposed on the branch regeneration desorption gas inlet pipe (801), an eighth valve (V8) and a seventh valve (V7) are sequentially disposed on the first clean gas return pipe (15) between the regeneration gas inlet of the heat exchanger (3) and the main clean gas outlet pipe (7), and a sixth valve (V6) is disposed on the second clean gas return pipe (14).
4. The blast furnace gas desulfurization and alkali injection treatment system according to claim 3, wherein a regeneration gas fan (5) is provided on the first clean gas return pipe (15), the regeneration gas fan (5) is located between the eighth valve (V8) and the seventh valve (V7), and the second clean gas return pipe (14) is connected to the first clean gas return pipe (15) between the eighth valve (V8) and the regeneration gas fan (5).
5. The blast furnace gas desulfurization and alkali injection treatment system according to claim 1, wherein a ninth valve (V9) is provided on the main desorption gas outlet pipe (9), a second valve (V2) is provided on the branch desorption gas outlet pipe (901), and a tenth valve (V10) is provided on the third clean gas return pipe (16).
6. The blast furnace gas desulfurization and alkali injection treatment system according to claim 1, wherein the gas inlet of the adsorption tower (1) is located at the lower part of the adsorption tower (1), the gas outlet of the adsorption tower (1) is located at the top of the adsorption tower (1), and the purification medium is filled between the gas inlet of the adsorption tower (1) and the gas outlet of the adsorption tower (1).
7. The blast furnace gas desulfurization and alkali injection treatment system according to claim 1, wherein the blast furnace gas inlet main pipe (2) is provided with a spray cooling device (6) for reducing the temperature of the gas inside the pipe.
8. The blast furnace gas desulfurization and alkali injection treatment system according to claim 1, wherein the heat exchanger (3) is a steam heat exchanger.
9. The blast furnace gas desulfurization and alkali injection treatment system according to claim 1, characterized in that the heater (10) is a constant temperature heater.
10. The blast furnace gas desulfurization and soda injection treatment system according to claim 1, wherein a water injection layer (401), a soda injection layer (402), and a water flushing layer (403) are sequentially provided inside the soda injection tower (4) from bottom to top, and each of the water injection layer (401), the soda injection layer (402), and the water flushing layer (403) is provided with a spray device.
11. The blast furnace gas desulfurization and alkali injection treatment system according to claim 10, wherein the gas inlet of the alkali injection tower (4) is disposed at the bottom of the alkali injection tower (4), the gas outlet of the alkali injection tower (4) is disposed at the top of the alkali injection tower (4), and the water injection layer (401), the alkali injection layer (402), and the rinsing water layer (403) are located between the gas inlet of the alkali injection tower (4) and the gas outlet of the alkali injection tower (4).
12. The blast furnace gas desulfurization and soda injection treatment system according to claim 10, characterized in that a wastewater discharge port is provided at the bottom of the soda injection tower (4), and the wastewater discharge port of the soda injection tower (4) is connected to a salt extraction device (13).
13. The blast furnace gas desulfurization and alkali injection treatment system according to claim 1, wherein the purification medium is a hydrophobic microcrystalline material.
14. The blast furnace gas desulfurization and alkali-spraying treatment system according to claim 13, wherein the hydrophobic microcrystalline material is a zinc-modified ZSM-5 molecular sieve material or a copper-modified ZSM-5 molecular sieve material, and the silica-alumina ratio of the molecular sieve material is 150; and a ZSM-type molecular sieve adsorbent.
15. The blast furnace gas desulfurization and alkali injection treatment system according to claim 1, wherein at least one of the adsorption towers (1) is a spare adsorption tower.
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