Gas replacement system

Abstract

The utility model provides a coal gas replacement system. The coal gas replacement system comprises a first adsorption device, a second adsorption device, a mixing device, a heating device, an absorption device, a first gas source, a second gas source, a third gas source, a first clean coal gas pipeline and a second clean coal gas pipeline. The device has the beneficial effects that the desulfurized and purified clean gas can be used for carrying out thermal desorption on an adsorbent with saturated sulfur capacity, nitrogen and air mixed gas can also be used for carrying out thermal desorption, the adsorbent can be recycled and does not generate byproducts, the operation is simple, and the problems of catalyst deactivation and over-high cost are also avoided.

Description

Technical Field

[0001] The utility model relates to the field of metallurgy, in particular to coal gas fine desulfurization equipment, specifically a coal gas replacement system. Background Art

[0002] With increasingly stringent environmental protection requirements, in 2019, the Ministry of Ecology and Environment and five other ministries and commissions jointly issued the "Opinions on Promoting the Implementation of Ultra-low Emissions in the Steel Industry", which set more stringent requirements on the sulfur dioxide emission mass concentration in all links of steel production (the SO2 emission limit at the outlet of process systems such as hot blast furnaces and heat treatment furnaces is 50mg / m 3 The SO2 emission limit at the outlet of gas boiler is 35mg / m 3 ). Blast furnace gas desulfurization processes are mainly divided into two categories: source control and end-of-pipe control. The current mainstream desulfurization process is to build desulfurization facilities at the end of each process. Since each process is independent of each other, there are problems such as dispersed gas use, dispersed equipment, and dispersed management. In order to achieve ultra-low emission standards, it is necessary to build multiple sets of desulfurization facilities. The facilities are large in scale and the investment and operating costs are high. The shortcomings of end-of-pipe control are obvious, so blast furnace gas fine desulfurization technology is the general trend.

[0003] Sulfur in blast furnace gas mainly exists in the form of COS and H2S. Dry method and wet method are two commonly used blast furnace gas fine desulfurization processes. Wet desulfurization is to pass blast furnace gas through a hydrolysis device to convert organic sulfur into inorganic sulfur, and then use a spray tower to remove inorganic sulfur. During the operation of wet desulfurization, a large amount of wastewater will be generated, causing secondary pollution. When the sulfur content in the gas fluctuates greatly, it is necessary to manually adjust the amount of alkali solution, and the consumption of alkali solution is large, and the operating cost is high. Dry desulfurization is that blast furnace gas enters the hydrolysis tower after pretreatment to convert organic sulfur into inorganic sulfur, and then enters the adsorption tower. The adsorbent is used to adsorb and remove the hydrogen sulfide contained in the blast furnace gas itself and the hydrogen sulfide (H2S) produced by hydrolysis. No wastewater is generated during the operation of the dry desulfurization process. However, the existing dry desulfurization process has the problems of high device resistance, short service life of the adsorbent, and high operating cost. For example, Chinese patent CN215233228U discloses an automatic desulfurization device for hot blast furnace flue gas, in which the desulfurizer dry powder is ground and sprayed into the desulfurizer for desulfurization. The utilization rate of the desulfurizer is not high, resulting in impure desulfurization by-products, which affects the effective utilization of the by-products. In addition, a dust collector is required, which increases the system resistance and increases the power consumption and construction cost. Utility Model Content

[0004] The utility model aims to provide a coal gas replacement system, which aims to solve the technical problems in the prior art of short service life of the adsorbent, low use efficiency, large system resistance and high investment cost.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A gas replacement system comprises a first adsorption device, a second adsorption device, a heating device, a first gas source, a first clean gas pipeline, and a second clean gas pipeline;

[0007] The first adsorption device and the second adsorption device are respectively connected to an input pipeline, an output pipeline, a regeneration pipeline, and a delivery pipeline. The input pipeline is connected to the first gas source, the output pipeline is connected to the first clean coal gas pipeline, the regeneration pipeline is connected to the output pipeline, the heating device is connected to the regeneration pipeline, and the delivery pipeline is connected to the second clean coal gas pipeline. The input pipeline, the output pipeline, the regeneration pipeline, and the delivery pipeline are all provided with switch valve groups.

[0008] Further, the input pipeline includes a first pipeline and a second pipeline, the first adsorption device is connected to the first pipeline, a first switch valve group is provided in the first pipeline, the second adsorption device is connected to the second pipeline, a second switch valve group is provided in the second pipeline, and the first pipeline and the second pipeline are connected in parallel through a three-way device and then connected to the first gas source through a first parallel pipeline;

[0009] The output pipeline includes a third pipeline and a fourth pipeline, the first adsorption device is connected to the third pipeline, a third switch valve group is provided in the third pipeline, the second adsorption device is connected to the fourth pipeline, a fourth switch valve group is provided in the fourth pipeline, the third pipeline and the fourth pipeline are connected in parallel through a three-way device and then connected to the first clean gas pipeline through a second parallel pipeline;

[0010] The delivery pipeline includes a fifth pipeline and a sixth pipeline, the first adsorption device is connected to the fifth pipeline, a fifth switch valve group is provided in the fifth pipeline, the second adsorption device is connected to the sixth pipeline, a sixth switch valve group is provided in the sixth pipeline, the fifth pipeline and the sixth pipeline are connected in parallel through a three-way device and then connected to the second clean gas pipeline through a third parallel pipeline, and an exhaust switch valve group is provided in the third parallel pipeline;

[0011] The regeneration pipeline includes a seventh pipeline, an eighth pipeline, a regeneration branch and a heating pipeline. The first adsorption device is connected to the seventh pipeline, and a seventh switch valve group is arranged in the seventh pipeline. The second adsorption device is connected to the eighth pipeline, and an eighth switch valve group is arranged in the eighth pipeline. The seventh pipeline and the eighth pipeline are connected in parallel through a three-way device and then connected to the air outlet end of the heating device through a fourth parallel pipeline. The air inlet end of the heating device is connected to one end of the regeneration branch through the heating pipeline, and the other end of the regeneration branch is connected to the second parallel pipeline through a three-way device. A regeneration switch valve group is arranged in the regeneration branch, a first heating switch valve group is arranged in the heating pipeline, a second heating switch valve group is arranged in the fourth parallel pipeline, and the second heating switch valve group is arranged on a side close to the heating device.

[0012] Furthermore, it also includes an ammonia-air mixing system and an absorption system, the ammonia-air mixing system is connected to the regeneration pipeline, and the absorption system is connected to the transmission pipeline.

[0013] Further, the ammonia-air mixing system comprises an ammonia-air mixing device, a second gas source and a third gas source;

[0014] One air inlet end of the ammonia-air mixing device is connected to the second air source through a ninth pipeline, the other air inlet end of the ammonia-air mixing device is connected to the third air source through a tenth pipeline, the air outlet end of the ammonia-air mixing device is connected to one end of an eleventh pipeline, a ninth switch valve group is provided in the ninth pipeline, a tenth switch valve group is provided in the tenth pipeline, an eleventh switch valve group is provided in the eleventh pipeline, and the other end of the eleventh pipeline is connected to the other end of the heating pipeline and one end of the regeneration branch through a three-way device;

[0015] The absorption system comprises an alkali liquid absorption device, the air inlet end of the alkali liquid absorption device is connected to a twelfth pipeline, the air outlet end of the alkali liquid absorption device is connected to a thirteenth pipeline, a twelfth switch valve group is provided in the twelfth pipeline, a thirteenth switch valve group is provided in the thirteenth pipeline, the other end of the thirteenth pipeline is connected to the external atmosphere, and the other end of the twelfth pipeline is connected to the third parallel pipeline through a three-way device;

[0016] A first gas mixing pipeline and a second gas mixing pipeline are arranged between the third parallel pipeline and the fourth parallel pipeline, both ends of the first gas mixing pipeline and the second gas mixing pipeline are respectively connected to the third parallel pipeline and the fourth parallel pipeline through a three-way device, the connection end of the first gas mixing pipeline and the fourth parallel pipeline is close to the heating pipeline, and the connection end of the second gas mixing pipeline and the fourth parallel pipeline is far away from the heating pipeline, and a first gas mixing switch valve group is arranged on the fourth parallel pipeline, and the first gas mixing switch valve group is arranged between the first gas mixing pipeline and the second Between the connection end of the mixing gas pipeline and the fourth parallel pipeline, the connection end of the first mixing gas pipeline and the third parallel pipeline is far away from the second clean gas pipeline, and the connection end of the second mixing gas pipeline and the third parallel pipeline is close to the second clean gas pipeline. A second mixing gas switch valve group is arranged on the third parallel pipeline, and the second mixing gas switch valve group is arranged between the first mixing gas pipeline and the connection end of the second mixing gas pipeline and the third parallel pipeline. The first mixing gas pipeline is provided with a third mixing gas switch valve group, and the second mixing gas pipeline is provided with a fourth mixing gas switch valve group.

[0017] Furthermore, the first adsorption device and the second adsorption device are both adsorption towers, the heating device is an electric heater; and the first gas source is used to supply hydrolyzed blast furnace gas.

[0018] Furthermore, the heating range of the heating device is between 270°C and 290°C.

[0019] Furthermore, adsorbent is provided in both the first adsorption device and the second adsorption device.

[0020] Furthermore, the first pipeline and the fifth pipeline are connected in parallel with the first adsorption device through a three-way device, the third pipeline and the seventh pipeline are connected in parallel with the first adsorption device through a three-way device, the second pipeline and the sixth pipeline are connected in parallel with the second adsorption device through a three-way device, and the fourth pipeline and the eighth pipeline are connected in parallel with the second adsorption device through a three-way device.

[0021] Furthermore, the ammonia-air mixing device is a mixing tank, the alkali solution absorption device is an absorption tank, the second gas source is used to supply nitrogen, and the third gas source is used to supply compressed air.

[0022] Working principle:

[0023] The system is equipped with two adsorption towers, a mixing tank, a heater and an absorption tank, and controls the opening and closing of different pipelines through a switch valve group, thereby realizing different circuits, so that the two adsorption towers can switch between the adsorption state and the thermal desorption state, so that the adsorbent in the adsorption tower can be recycled repeatedly without generating additional by-products, thereby improving the service life of the adsorbent in the adsorption tower.

[0024] Compared with the prior art, the utility model has the following beneficial effects: the clean coal gas after desulfurization purification can be used to thermally desorb the sulfur-saturated adsorbent, or a nitrogen-air mixture can be used for thermal desorption; the adsorbent can be recycled repeatedly without producing by-products; the operation is simple, and the problems of catalyst deactivation and excessive cost are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a pipeline schematic diagram of Example 1 of a gas replacement system of the utility model.

[0026] Figure 2 It is a pipeline schematic diagram of Example 2 of a gas replacement system of the utility model.

[0027] Figure 3 The utility model is a schematic diagram of a working state of a gas replacement system.

[0028] Figure 4 This is another working state schematic diagram of a gas replacement system of the utility model.

[0029] Figure 5 The utility model is a schematic diagram of a clean coal gas thermal desorption circuit of a coal gas replacement system.

[0030] Figure 6 The utility model is a schematic diagram of a mixed gas thermal desorption circuit of a coal gas replacement system. DETAILED DESCRIPTION

[0031] Example 1

[0032] Figure 1 to Figure 6 In the figure, X indicates that the switch valve group in the pipeline is closed and the pipeline is in an open circuit state.

[0033] See also Figure 1 , the utility model provides a technical solution:

[0034] A gas replacement system includes a first adsorption tower 101, a second adsorption tower 102, an electric heater 103, a first gas source 201, a first clean gas pipeline 202, and a second clean gas pipeline 203;

[0035] The first adsorption tower 101 and the second adsorption tower 102 are each connected to an input pipeline, an output pipeline, a regeneration pipeline, and a delivery pipeline. The input pipeline is connected to the first gas source 201, the output pipeline is connected to the first clean gas pipeline 202, the regeneration pipeline is connected to the output pipeline, the electric heater 103 is connected to the regeneration pipeline, and the delivery pipeline is connected to the second clean gas pipeline 203. The input pipeline, the output pipeline, the regeneration pipeline, and the delivery pipeline are all provided with switch valve groups;

[0036] in,

[0037] The input pipeline includes a first pipeline 301 and a second pipeline 302, the first adsorption tower 101 is connected to the first pipeline 301, a first switch valve group 501 is provided in the first pipeline 301, the second adsorption tower 102 is connected to the second pipeline 302, a second switch valve group 502 is provided in the second pipeline 302, and the first pipeline 301 and the second pipeline 302 are connected in parallel through a three-way device and then connected to the first gas source 201 through a first parallel pipeline 401;

[0038] The output pipeline includes a third pipeline 303 and a fourth pipeline 304. The first adsorption tower 101 is connected to the third pipeline 303, and a third switch valve group 503 is provided in the third pipeline 303. The second adsorption tower 102 is connected to the fourth pipeline 304, and a fourth switch valve group 504 is provided in the fourth pipeline 304. The third pipeline 303 and the fourth pipeline 304 are connected in parallel through a three-way device and then connected to the first clean gas pipeline 202 through a second parallel pipeline 402.

[0039] The delivery pipeline includes a fifth pipeline 305 and a sixth pipeline 306. The first adsorption tower 101 is connected to the fifth pipeline 305, and a fifth switch valve group 505 is provided in the fifth pipeline 305. The second adsorption tower 102 is connected to the sixth pipeline 306, and a sixth switch valve group 506 is provided in the sixth pipeline 306. The fifth pipeline 305 and the sixth pipeline 306 are connected in parallel through a three-way device and then connected to the second clean gas pipeline 203 through a third parallel pipeline 403. An exhaust switch valve group 601 is provided in the third parallel pipeline 403.

[0040] The regeneration pipeline includes a seventh pipeline 307, an eighth pipeline 308, a regeneration branch 405 and a heating pipeline 406. The first adsorption tower 101 is connected to the seventh pipeline 307, and a seventh switch valve group 507 is provided in the seventh pipeline 307. The second adsorption tower 102 is connected to the eighth pipeline 308, and an eighth switch valve group 508 is provided in the eighth pipeline 308. The seventh pipeline 307 and the eighth pipeline 308 are connected in parallel through a three-way device and then connected to the outlet of the electric heater 103 through the fourth parallel pipeline 404. The two ends are connected, the air inlet end of the electric heater 103 is connected to one end of the regeneration branch 405 through the heating pipeline 406, the other end of the regeneration branch 405 is connected to the second parallel pipeline 402 through a three-way device, a regeneration switch valve group 602 is arranged in the regeneration branch 405, a first heating switch valve group 603 is arranged in the heating pipeline 406, a second heating switch valve group 604 is arranged in the fourth parallel pipeline 404, and the second heating switch valve group 604 is arranged on the side close to the electric heater 103.

[0041] Example 2

[0042] See also Figure 2 , Embodiment 2 differs from Embodiment 1 in that it further comprises an ammonia-air gas mixing system and an absorption system, the ammonia-air gas mixing system is connected to the regeneration pipeline, and the absorption system is connected to the delivery pipeline;

[0043] in,

[0044] The ammonia-air mixing system includes an ammonia-air mixing tank 104, a second gas source 204 and a third gas source 205;

[0045] One air inlet end of the ammonia-air mixing tank 104 is connected to the second air source 204 through the ninth pipeline 309, and the other air inlet end of the ammonia-air mixing tank 104 is connected to the third air source 205 through the tenth pipeline 310. The air outlet end of the ammonia-air mixing tank 104 is connected to one end of the eleventh pipeline 311. The ninth pipeline 309 is provided with a ninth switch valve group 509, the tenth pipeline 310 is provided with a tenth switch valve group 510, and the eleventh pipeline 311 is provided with an eleventh switch valve group 511. The other end of the eleventh pipeline 311 is connected to the other end of the heating pipeline 406 and one end of the regeneration branch 405 through a three-way device.

[0046] The absorption system includes an alkali liquid absorption tank 105, the air inlet end of the alkali liquid absorption tank 105 is connected to the twelfth pipeline 312, the air outlet end of the alkali liquid absorption tank 105 is connected to the thirteenth pipeline 313, the twelfth pipeline 312 is provided with a twelfth switch valve group 512, the thirteenth pipeline 313 is provided with a thirteenth switch valve group 513, the other end of the thirteenth pipeline 313 is connected to the external atmosphere, and the other end of the twelfth pipeline 312 is connected to the third parallel pipeline 403 through a three-way device;

[0047] A first gas mixing pipeline 407 and a second gas mixing pipeline 408 are arranged between the third parallel pipeline 403 and the fourth parallel pipeline 404. Both ends of the first gas mixing pipeline 407 and the second gas mixing pipeline 408 are connected to the third parallel pipeline 403 and the fourth parallel pipeline 404 through a three-way device. The connection end of the first gas mixing pipeline 407 and the fourth parallel pipeline 404 is close to the heating pipeline 406, and the connection end of the second gas mixing pipeline 408 and the fourth parallel pipeline 404 is far away from the heating pipeline 406. The fourth parallel pipeline 404 is provided with a first gas mixing switch valve group 605, which is arranged between the first gas mixing pipeline 407 and the second gas mixing pipeline. The first gas mixing pipeline 407 is connected to the third parallel pipeline 403, and the second gas mixing pipeline 408 is connected to the third parallel pipeline 403. The connecting end of the first gas mixing pipeline 407 and the third parallel pipeline 403 is far away from the second clean gas pipeline 203, and the connecting end of the second gas mixing pipeline 408 and the third parallel pipeline 403 is close to the second clean gas pipeline 203. The third parallel pipeline 403 is provided with a second gas mixing switch valve group 606, and the second gas mixing switch valve group 606 is arranged between the connecting ends of the first gas mixing pipeline 407 and the second gas mixing pipeline 408 and the third parallel pipeline 403. The first gas mixing pipeline 407 is provided with a third gas mixing switch valve group 607, and the second gas mixing pipeline 408 is provided with a fourth gas mixing switch valve group 608.

[0048] Example 3

[0049] The difference between Example 3 and the above-mentioned examples is that the first pipeline 301 and the fifth pipeline 305 are connected in parallel with the first adsorption tower 101 through a three-way device, the third pipeline 303 and the seventh pipeline 307 are connected in parallel with the first adsorption tower 101 through a three-way device, the second pipeline 302 and the sixth pipeline 306 are connected in parallel with the second adsorption tower 102 through a three-way device, and the fourth pipeline 304 and the eighth pipeline 308 are connected in parallel with the second adsorption tower 102 through a three-way device.

[0050] Furthermore, the first gas source 201 is used to supply the hydrolyzed blast furnace gas.

[0051] Furthermore, the heating range of the electric heater 103 is 270°C to 290°C.

[0052] Furthermore, adsorbent is disposed in both the first adsorption tower 101 and the second adsorption tower 102 .

[0053] Furthermore, the second gas source 204 is used to supply nitrogen, and the third gas source 205 is used to supply compressed air.

[0054] Specifically, the adsorption tower, ammonia-air mixing tank, electric heater, and alkali solution absorption tank are all mature products of the prior art, and those skilled in the art are well aware of them, so their specific structures will not be described in detail.

[0055] Specifically, the heating range of 270° C. to 290° C. of the electric heater 103 is a safe temperature after testing, which will not cause safety accidents and can improve the efficiency of thermal desorption.

[0056] Specifically, the electric heater 103 may be a cavity with a heating function, and the cavity is connected to the heating pipeline 406 and the fourth parallel pipeline 404 respectively.

[0057] Specifically, the adsorption tower is used to carry out adsorption and fine desulfurization of the blast furnace gas after hydrolysis, the ammonia-air mixing tank is used to mix nitrogen and compressed air, and the alkali solution absorption tank is used to absorb sulfur in the ammonia-air mixed gas after thermal desorption.

[0058] The working process of this embodiment:

[0059] In Example 1, the first adsorption tower 101 and the second adsorption tower 102 are operated in parallel, and the working method is as follows:

[0060] When the first adsorption tower 101 is in the adsorption working state, the second adsorption tower 102 is in the thermal desorption working state; when in the adsorption working state, the air intake method of the first adsorption tower 101 is from bottom to top, and when in the thermal desorption working state and using clean coal gas for thermal desorption, the air intake method of the second adsorption tower 102 is from top to bottom; the electric heater 103 is used to heat the clean coal gas to reach the required temperature for thermal desorption; the clean coal gas is heated by the electric heater 103 and then sent to the second adsorption tower 102 for thermal desorption, and the clean coal gas after thermal desorption is sent to the second clean coal gas pipeline 203.

[0061] In Example 1, clean coal gas desorption regeneration can be used, and the process includes the following steps:

[0062] The first gas source 201 is used to supply blast furnace gas after hydrolysis in the hydrolysis tower. The blast furnace gas enters the first adsorption tower 101 for adsorption and fine desulfurization to form clean gas. The clean gas enters the first clean gas pipeline 202 through the third pipeline 303. When the adsorbent in the second adsorption tower 102 reaches sulfur saturation, the regeneration switch valve group 602 is opened to take a portion of the clean gas after adsorption by the first adsorption tower 101. The clean gas is heated to 270°C~290°C in the electric heater 103 through the regeneration branch 405 and the heating pipeline 406, and then sent to the second adsorption tower 102 through the eighth pipeline 308, and the adsorbent is thermally desorbed. The clean gas after desorption is sent back to the second clean gas pipeline 203.

[0063] The switch valve groups on the first adsorption tower 101 and the second adsorption tower 102 are divided into an adsorption working switch valve group and a thermal desorption working switch valve group. When the adsorption working switch valve group of one tower is opened, the thermal desorption switch valve group of the tower is closed; the adsorption working switch valve group of the other tower is closed, and the thermal desorption switch valve group of the tower is opened. After the tower currently in the adsorption working state reaches sulfur saturation, the switch valve group that was originally in the open state is closed, and the switch valve group in the closed state is opened, and the cycle is used uninterruptedly. When used as a thermal desorption tower, it needs to be cooled for a period of time after the thermal desorption is completed to cool the adsorbent.

[0064] Specifically, Figure 3 As shown, the second switch valve group 502, the fourth switch valve group 504, the fifth switch valve group 505 and the seventh switch valve group 507 are closed, and the first switch valve group 501, the third switch valve group 503, the sixth switch valve group 506, and the eighth switch valve group 508 are opened, so that the first adsorption tower 101 is in the adsorption working state, and the second adsorption tower 102 enters the thermal desorption state;

[0065] like Figure 4 As shown, the second switch valve group 502, the fourth switch valve group 504, the fifth switch valve group 505 and the seventh switch valve group 507 are opened, and the first switch valve group 501, the third switch valve group 503, the sixth switch valve group 506 and the eighth switch valve group 508 are closed, so that the first adsorption tower 101 is in a thermal desorption working state, and the second adsorption tower 102 enters an adsorption state.

[0066] In Example 2, compared with Example 1, an ammonia-air mixing system and an absorption system are added. Example 2 can achieve the effect of thermal desorption using clean coal gas in Example 1 by controlling the switch. Figure 5 As shown, the ninth switch valve group 509, the tenth switch valve group 510, the eleventh switch valve group 511, the twelfth switch valve group 512, the third gas mixing switch valve group 607, and the fourth gas mixing switch valve group 608 are closed, and the exhaust switch valve group 601, the return gas switch valve group 602, the first gas mixing switch valve group 605, and the second gas mixing switch valve group 606 are opened.

[0067] Example 2: A nitrogen-air mixture can also be used for thermal desorption, as follows: Figure 6 As shown, the exhaust switch valve group 601, the return air switch valve group 602, the first gas mixing switch valve group 605, and the second gas mixing switch valve group 606 are closed, and the ninth switch valve group 509, the tenth switch valve group 510, the eleventh switch valve group 511, the twelfth switch valve group 512, the third gas mixing switch valve group 607, and the fourth gas mixing switch valve group 608 are opened;

[0068] The process includes the following steps:

[0069] When the first adsorption tower 101 is in the adsorption working state, the second adsorption tower 102 enters the thermal desorption state, and nitrogen and compressed air are respectively supplied through the second gas source 204 and the third gas source 205, and the nitrogen and compressed air are sent to the ammonia-air mixing tank 104 to form a mixed gas. After mixing, the mixed gas enters the electric heater 103 through the eleventh pipeline 311, and the mixed gas is heated to 270°C to 290°C in the electric heater 103, and then enters the tower from the bottom of the second adsorption tower 102 through the first mixed gas pipeline 407 and the sixth pipeline 306 for thermal desorption. The mixed gas after thermal desorption is discharged from the top of the second adsorption tower 102 through the eighth pipeline 308, the second mixed gas pipeline 408, the third parallel pipeline 403, and the twelfth pipeline 312 to the alkali liquid absorption tank 105, and the alkali liquid absorption tank 105 absorbs sulfur in the mixed gas, and the desulfurized mixed gas can be directly discharged into the atmosphere.

[0070] In the above operation steps, the first adsorption tower 101 and the second adsorption tower 102 can be alternately used by controlling the opening and closing of the related switch valve groups:

[0071] In the above operation steps, the clean coal gas / ammonia-air mixture should be heated to 270° C. to 290° C. when heated by the electric heater 103 .

[0072] Example 3 simplifies the pipeline connection by means of parallel pipelines. There is a purging step in the gas replacement process, which is used to clean impurities in each pipeline. This step can ensure that interconnected pipelines (parallel pipelines) or pipelines with different functions (transport pipelines) will not interfere with each other.

Claims

1. A gas replacement system, characterized in that: It comprises a first adsorption device (101), a second adsorption device (102), a heating device (103), a first gas source (201), a first clean coal gas pipeline (202), and a second clean coal gas pipeline (203); The first adsorption device (101) and the second adsorption device (102) are each connected to an input pipeline, an output pipeline, a regeneration pipeline, and a delivery pipeline; the input pipeline is connected to the first gas source (201); the output pipeline is connected to the first clean coal gas pipeline (202); the regeneration pipeline is connected to the output pipeline; the heating device (103) is connected to the regeneration pipeline; the delivery pipeline is connected to the second clean coal gas pipeline (203); and the input pipeline, the output pipeline, the regeneration pipeline, and the delivery pipeline are each provided with a switch valve group.

2. A gas replacement system according to claim 1, characterized in that: The input pipeline comprises a first pipeline (301) and a second pipeline (302); the first adsorption device (101) is connected to the first pipeline (301); a first switch valve group (501) is provided in the first pipeline (301); the second adsorption device (102) is connected to the second pipeline (302); a second switch valve group (502) is provided in the second pipeline (302); the first pipeline (301) and the second pipeline (302) are connected in parallel through a three-way device and then connected to the first gas source (201) through a first parallel pipeline (401); The output pipeline comprises a third pipeline (303) and a fourth pipeline (304); the first adsorption device (101) is connected to the third pipeline (303); a third switch valve group (503) is provided in the third pipeline (303); the second adsorption device (102) is connected to the fourth pipeline (304); a fourth switch valve group (504) is provided in the fourth pipeline (304); the third pipeline (303) and the fourth pipeline (304) are connected in parallel through a three-way device and then connected to the first clean coal gas pipeline (202) through a second parallel pipeline (402); The delivery pipeline comprises a fifth pipeline (305) and a sixth pipeline (306); the first adsorption device (101) is in communication with the fifth pipeline (305); a fifth switch valve group (505) is provided in the fifth pipeline (305); the second adsorption device (102) is in communication with the sixth pipeline (306); a sixth switch valve group (506) is provided in the sixth pipeline (306); the fifth pipeline (305) and the sixth pipeline (306) are connected in parallel through a three-way device and then connected to the second clean coal gas pipeline (203) through a third parallel pipeline (403); an exhaust switch valve group (601) is provided in the third parallel pipeline (403); The regeneration pipeline comprises a seventh pipeline (307), an eighth pipeline (308), a regeneration branch (405) and a heating pipeline (406); the first adsorption device (101) is connected to the seventh pipeline (307); a seventh switch valve group (507) is provided in the seventh pipeline (307); the second adsorption device (102) is connected to the eighth pipeline (308); an eighth switch valve group (508) is provided in the eighth pipeline (308); the seventh pipeline (307) and the eighth pipeline (308) are connected in parallel through a three-way device and then connected to the heating device (103) through a fourth parallel pipeline (404). ), the air inlet end of the heating device (103) is connected to one end of the regeneration branch (405) through the heating pipeline (406), the other end of the regeneration branch (405) is connected to the second parallel pipeline (402) through a three-way device, a regeneration switch valve group (602) is provided in the regeneration branch (405), a first heating switch valve group (603) is provided in the heating pipeline (406), a second heating switch valve group (604) is provided in the fourth parallel pipeline (404), and the second heating switch valve group (604) is provided on a side close to the heating device (103).

3. A gas replacement system according to claim 2, characterized in that: It also includes an ammonia-air mixing system and an absorption system. The ammonia-air mixing system is connected to the regeneration pipeline, and the absorption system is connected to the transmission pipeline.

4. A gas replacement system according to claim 3, characterized in that: The ammonia-air mixing system comprises an ammonia-air mixing device (104), a second gas source (204) and a third gas source (205); One air inlet end of the ammonia-air mixing device (104) is connected to the second air source (204) via a ninth pipeline (309), the other air inlet end of the ammonia-air mixing device (104) is connected to the third air source (205) via a tenth pipeline (310), the air outlet end of the ammonia-air mixing device (104) is connected to one end of an eleventh pipeline (311), a ninth switch valve group (509) is provided in the ninth pipeline (309), a tenth switch valve group (510) is provided in the tenth pipeline (310), an eleventh switch valve group (511) is provided in the eleventh pipeline (311), and the other end of the eleventh pipeline (311) is connected to the other end of the heating pipeline (406) and one end of the regeneration branch (405) via a three-way device; The absorption system comprises an alkali liquid absorption device (105), the air inlet end of the alkali liquid absorption device (105) is connected to a twelfth pipeline (312), the air outlet end of the alkali liquid absorption device (105) is connected to a thirteenth pipeline (313), a twelfth switch valve group (512) is provided in the twelfth pipeline (312), a thirteenth switch valve group (513) is provided in the thirteenth pipeline (313), the other end of the thirteenth pipeline (313) is connected to the external atmosphere, and the other end of the twelfth pipeline (312) is connected to the third parallel pipeline (403) through a three-way device; A first gas mixing pipeline (407) and a second gas mixing pipeline (408) are arranged between the third parallel pipeline (403) and the fourth parallel pipeline (404); both ends of the first gas mixing pipeline (407) and the second gas mixing pipeline (408) are connected to the third parallel pipeline (403) and the fourth parallel pipeline (404) through a three-way device; the connection end between the first gas mixing pipeline (407) and the fourth parallel pipeline (404) is close to the heating pipeline (406); the connection end between the second gas mixing pipeline (408) and the fourth parallel pipeline (404) is far away from the heating pipeline (406); the fourth parallel pipeline (404) is provided with a first gas mixing switch valve group (605); the first gas mixing switch valve group (605) is arranged between the first gas mixing pipeline (407) and the second The connection end between the gas mixing pipeline (408) and the fourth parallel pipeline (404) is far away from the second clean coal gas pipeline (203), and the connection end between the second gas mixing pipeline (408) and the third parallel pipeline (403) is close to the second clean coal gas pipeline (203). The third parallel pipeline (403) is provided with a second gas mixing switch valve group (606). The second gas mixing switch valve group (606) is provided between the first gas mixing pipeline (407) and the connection end between the second gas mixing pipeline (408) and the third parallel pipeline (403). The first gas mixing pipeline (407) is provided with a third gas mixing switch valve group (607), and the second gas mixing pipeline (408) is provided with a fourth gas mixing switch valve group (608).

5. A gas replacement system according to claim 1, characterized in that: The first adsorption device (101) and the second adsorption device (102) are both adsorption towers, the heating device (103) is an electric heater; and the first gas source (201) is used to supply hydrolyzed blast furnace gas.

6. A gas replacement system according to claim 1, characterized in that: The heating range of the heating device (103) is 270°C to 290°C.

7. A gas replacement system according to claim 1, characterized in that: Adsorbent is disposed in both the first adsorption device (101) and the second adsorption device (102).

8. A gas replacement system according to claim 2, characterized in that: The first pipeline (301) and the fifth pipeline (305) are connected in parallel through a three-way device and are connected to the first adsorption device (101); the third pipeline (303) and the seventh pipeline (307) are connected in parallel through a three-way device and are connected to the first adsorption device (101); the second pipeline (302) and the sixth pipeline (306) are connected in parallel through a three-way device and are connected to the second adsorption device (102); the fourth pipeline (304) and the eighth pipeline (308) are connected in parallel through a three-way device and are connected to the second adsorption device (102).

9. A gas replacement system according to claim 4, characterized in that: The ammonia-air mixing device (104) is a mixing tank, the alkali solution absorption device (105) is an absorption tank, the second gas source (204) is used to supply nitrogen, and the third gas source (205) is used to supply compressed air.

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