CN210656829U - Blast furnace gas BKRP desulfurization system - Google Patents
Blast furnace gas BKRP desulfurization system Download PDFInfo
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- CN210656829U CN210656829U CN201921402562.3U CN201921402562U CN210656829U CN 210656829 U CN210656829 U CN 210656829U CN 201921402562 U CN201921402562 U CN 201921402562U CN 210656829 U CN210656829 U CN 210656829U
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Abstract
The utility model provides a blast furnace gas BKRP desulfurization system belongs to blast furnace gas desulfurization technical field. The system comprises an absorption tower, an oxidation regenerator, a rich liquid pump, a lean liquid pump, a liquid separating tank, a sulfur slurry pump, a blower, a sulfur cake storage tank, a medicament tank, a sulfur filtering system and an air distributor, wherein the lower part of the absorption tower is connected with the oxidation regenerator through the rich liquid pump, the upper part of the absorption tower is connected with the liquid separating tank, and lean liquid in the oxidation regenerator is conveyed to the upper part of the absorption tower through the lean liquid pump. And conveying the sulfur slurry in the oxidation regenerator to a sulfur filtering system through a sulfur slurry pump, returning filtrate of the sulfur filtering system to the oxidation regenerator, and conveying the sulfur cakes to a sulfur cake storage tank. The medicament is added into the oxidation regenerator through a medicament tank. The system effectively removes the total sulfur (including organic and inorganic sulfur) in the blast furnace gas, has small pressure drop of the whole system, does not influence downstream users, has simple process equipment and low investment and has higher economic advantage.
Description
Technical Field
The utility model relates to a blast furnace gas desulfurization technical field especially indicates a blast furnace gas BKRP desulfurization system.
Background
Blast furnace iron making is a main method of modern iron making and is an important link of steel production. The iron-smelting process is to charge iron-containing raw materials, fuel and other auxiliary raw materials into a blast furnace from the top of the furnace according to a certain proportion. Hot air is blown from the lower part of the furnace through a hot blast furnace, and carbon in the fuel and the blown hot air generate carbon monoxide and hydrogen at high temperature. The blast furnace gas mainly comprises 15% of carbon dioxide, 0.5% of methane, 25% of carbon monoxide, 1% of hydrogen, 58% of nitrogen and 800-1000 Kcal/Nm of heat value3. The sulfur components are mainly hydrogen sulfide and carbonyl sulfide and other sulfides.
In recent years, with the continuous optimization of blast furnace iron-making process, the common application of blast furnace gas dry bag dust removal and residual pressure turbine power generation devices (TRT or BPRT), the heat energy and the pressure energy of the blast furnace gas are fully recovered. The blast furnace gas is directly used as fuel for hot blast stove, coke oven, sintering, pelletizing, lime kiln, steel rolling heating furnace and other processes. The sulfur compounds after combustion will be converted into SO2And SO3Acid rain is formed, resulting in environmental pollution. With the strictness of environmental regulations, SO generated after the combustion of blast furnace gas is required at present2The content is less than 30mg/m3I.e. a sulphur content of less than 15mg/m3. The blast furnace gas has more utilization points, and if the treatment after combustion is carried out to meet the requirement of environmental protection and remove sulfur in the flue gas, a plurality of sets of desulfurization facilities need to be built, so that the investment is larger and the operation cost is high.
As in the Chinese patent: CN206927863U 'a system for removing hydrogen sulfide in coal gas', the system described in the patent is to introduce coal gas into an alkaline washing tower, and remove hydrogen sulfide in blast furnace coal gas through the action of alkaline washing, organic sulfur in coal gas can not be effectively removed, and the traditional desulfurization method can not treat organic sulfur.
As in the Chinese patent: CN109609202A, "a method for desulfurizing and purifying blast furnace gas", describes a method of using the temperature and pressure of blast furnace gas to perform organic sulfur conversion, hydrolyze carbonyl sulfide into hydrogen sulfide, and then remove sulfide in blast furnace gas. However, the pressure loss caused by the method is large, the TRT can reduce a large amount of generated energy every year, and no successful case exists at present.
Therefore, in view of the current situation, it is an urgent need to develop a process capable of simultaneously removing organic sulfur and inorganic sulfur in blast furnace gas and minimizing the influence on the original process.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a blast furnace gas BKRP desulfurization system.
The system comprises an absorption tower, an oxidation regenerator, a pregnant solution pump, a barren solution pump, a solution separating tank, a sulfur slurry pump, a blower, a sulfur cake storage tank, a medicament tank, a sulfur filtering system and an air distributor, wherein the lower part of the absorption tower is connected with the oxidation regenerator through the pregnant solution pump, the upper part of the absorption tower is connected with the solution separating tank, and barren solution in the oxidation regenerator is conveyed to the upper part of the absorption tower through the barren solution pump; and conveying the sulfur slurry in the oxidation regenerator to a sulfur filtering system through a sulfur slurry pump, returning filtrate of the sulfur filtering system to the oxidation regenerator, and conveying sulfur cakes of the sulfur filtering system to a sulfur cake storage tank.
Wherein, the gas that the knockout drum produced gets into the coal gas pipe network, and the liquid that produces returns the absorption tower.
An air distributor is arranged in the oxidation regenerator and is connected with an external blower.
The sulfur filtering system adopts a vacuum filter.
When the system stops running, the position of the air distributor is higher than the highest elevation of the liquid level in the oxidation regenerator, so that scaling is prevented.
And the air distributor is provided with flushing water, and when the air blower stops running, the flushing water flushes the pipeline of the air distributor.
The utility model discloses an above-mentioned technical scheme's beneficial effect as follows:
in the scheme, the total sulfur (including organic and inorganic) in the blast furnace gas can be effectively removed, the pressure drop of the whole system is small, downstream users are not affected, the process equipment is simple, the investment is low, and the economic advantage is high.
Drawings
Fig. 1 is a schematic structural view of the blast furnace gas BKRP desulfurization system of the present invention.
Wherein: 1-an absorption column; 2-an oxidation regenerator; 3-a liquid enrichment pump; 4-a barren liquor pump; 5-liquid separation tank; 6-slurry pump; 7-a blower; 8-sulfur cake storage tank; 9-a medicament can; 10-sulfur filtration system, 11-air distributor.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The utility model provides a blast furnace gas BKRP desulfurization system.
As shown in fig. 1, the system comprises an absorption tower 1, an oxidation regenerator 2, a rich liquor pump 3, a lean liquor pump 4, a liquor separation tank 5, a sulfur liquor pump 6, a blower 7, a sulfur cake storage tank 8, a medicament tank 9, a sulfur filtering system 10 and an air distributor 11, wherein the oxidation regenerator 2 is connected below the absorption tower 1 through the rich liquor pump 3, the liquor separation tank 5 is connected to the upper part of the absorption tower 1, and lean liquor in the oxidation regenerator 2 is conveyed to the upper part of the absorption tower 1 through the lean liquor pump 4; and the sulfur slurry in the oxidation regenerator 2 is conveyed to a sulfur filtering system 10 through a sulfur slurry pump 6, the filtrate of the sulfur filtering system 10 returns to the oxidation regenerator 2, and the sulfur cake of the sulfur filtering system 10 is conveyed to a sulfur cake storage tank 8.
Gas generated by the liquid separation tank 5 enters a gas pipe network, and generated liquid returns to the absorption tower 1.
An air distributor 11 is arranged in the oxidation regenerator 2, and the air distributor 11 is connected with an external blower 7.
The following description is given with reference to specific examples.
At present, aiming at the front-end desulfurization treatment of blast furnace gas, a small number of enterprises remove hydrogen sulfide gas in the gas by adding an alkaline washing tower after power generation and spraying sodium hydroxide solution. However, this process can only remove inorganic sulfur and, at the same time, leads to a reduction in the calorific value of the export gas, since the water content of the gas increases by alkaline scrubbing. With the stricter environmental protection, the emission requirements cannot be met only by removing inorganic sulfur. Therefore, the utility model discloses then develop a novel BKRP method blast furnace gas desulfurization process, increase one set of desulfurization system behind the TRT electricity generation, get rid of carbonyl sulphur and hydrogen sulfide simultaneously to do not influence the former technology of blast furnace gas.
In practical application, the sulfur filtration system 10 adopts a vacuum filter.
Blast furnace gas from TRT power generation enters from the lower part of an absorption tower 1 and is in countercurrent contact with a desulfurization solution (modified complex iron solution) in the absorption tower 1, sulfides in the gas phase are absorbed and removed by a liquid phase and are converted into sulfur, the purified blast furnace gas is separated from the top of the absorption tower 1 through a liquid separation tank 5, the gas enters a gas pipe network, and the liquid returns to the absorption tower 1; the rich liquor is pumped into the oxidation regenerator 2. In the oxidation regenerator 2, an oxidation regeneration area is arranged above the air distributor 11, a sulfur particle settling area is arranged below the air distributor 11, and sulfur particles are gradually enriched in an inverted cone at the bottom of the reactor to form sulfur slurry. The regenerated barren solution returns to the absorption tower 1 for recycling; and (3) pumping the sulfur slurry into a vacuum filter by using a pump, separating to obtain a sulfur cake and a filtrate, feeding the sulfur cake into a sulfur cake storage tank 8, and feeding the filtrate back to the oxidation regenerator 2. According to the consumption condition of the desulfurizer, fresh agent is added from the raw material liquid storage tank periodically and enters the oxidation regenerator 2. The pressure loss of the whole system is less than 3kPa, and the desulfurization rate is more than 75 percent.
The system is combined with the current blast furnace gas process flow in the iron and steel industry, the sulfur-containing substances in the blast furnace gas are intensively treated, the sulfur-containing substances in the blast furnace gas are solved from the source, the blast furnace gas of the iron and steel enterprise is deeply purified before entering downstream users for use, the problem that the smoke emission of the downstream users of the blast furnace gas in the industry exceeds the standard is solved, the technology reaches the industry leading level, and the system has higher advantages compared with tail end treatment.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides a blast furnace gas BKRP desulfurization system which characterized in that: the device comprises an absorption tower (1), an oxidation regenerator (2), a pregnant solution pump (3), a barren solution pump (4), a liquid separating tank (5), a sulfur slurry pump (6), an air blower (7), a sulfur cake storage tank (8), a medicament tank (9), a sulfur filtering system (10) and an air distributor (11), wherein the lower part of the absorption tower (1) is connected with the oxidation regenerator (2) through the pregnant solution pump (3), the upper part of the absorption tower (1) is connected with the liquid separating tank (5), and barren solution in the oxidation regenerator (2) is conveyed to the upper part of the absorption tower (1) through the barren solution pump (4); and the sulfur slurry in the oxidation regenerator (2) is conveyed to a sulfur filtering system (10) through a sulfur slurry pump (6), the filtrate of the sulfur filtering system (10) returns to the oxidation regenerator (2), and the sulfur cake of the sulfur filtering system (10) is conveyed to a sulfur cake storage tank (8).
2. The blast furnace gas BKRP desulfurization system of claim 1, characterized in that: and gas generated by the liquid separation tank (5) enters a gas pipe network, and generated liquid returns to the absorption tower (1).
3. The blast furnace gas BKRP desulfurization system of claim 1, characterized in that: an air distributor (11) is arranged in the oxidation regenerator (2), and the air distributor (11) is connected with an external blower (7).
4. The blast furnace gas BKRP desulfurization system of claim 1, characterized in that: the sulfur filtering system (10) adopts a vacuum filter.
5. The blast furnace gas BKRP desulfurization system of claim 1, characterized in that: when the system stops running, the air distributor (11) is positioned higher than the highest level of the liquid level in the oxidation regenerator (2).
6. The blast furnace gas BKRP desulfurization system of claim 1, characterized in that: and the air distributor (11) is provided with flushing water, and when the blower (7) stops running, the flushing water flushes the pipeline of the air distributor (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921402562.3U CN210656829U (en) | 2019-08-27 | 2019-08-27 | Blast furnace gas BKRP desulfurization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921402562.3U CN210656829U (en) | 2019-08-27 | 2019-08-27 | Blast furnace gas BKRP desulfurization system |
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| Publication Number | Publication Date |
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| CN210656829U true CN210656829U (en) | 2020-06-02 |
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| CN201921402562.3U Active CN210656829U (en) | 2019-08-27 | 2019-08-27 | Blast furnace gas BKRP desulfurization system |
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