Coal chemical synthesis gas-water separation device

Abstract

The utility model discloses a coal chemical synthesis gas-water separation device. A gasification furnace is connected with a water scrubber, the water scrubber is connected with a conversion separator, a coal gas preheater is arranged at the bottom of the conversion separator, the coal gas preheater is connected with a detoxification tank through a pipeline, the detoxification tank is connected with a conversion furnace, and the conversion furnace is connected with a gas storage tank through a pipeline. According to the utility model, the water separation space is increased by heightening the tower body of the water scrubber, the conversion separator is arranged for gas-water separation, the steam tracing pipeline is arranged on the pipeline in front of the conversion separator, and the gas preheater is arranged at the outlet of the conversion separator for reducing condensate water; a gas guide pipe is arranged at the bottom of the conversion furnace to keep gas flow to avoid formation of dead space and condensed water, and the purpose of preventing water from entering a catalyst layer is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal chemical conversion, and in particular relates to a coal chemical synthesis gas-water separation device. Background Art

[0002] Coal chemical process generally includes coal gasification, carbon monoxide conversion, coal gas purification and product gas synthesis. In these processes, gasification water scrubbers are often set up to wash and remove dust from the gas before entering the subsequent conversion and purification steps. Carbon monoxide conversion is the core process of coal chemical process, which often requires the use of catalysts to convert CO in the raw gas into CO2 to avoid poisoning. At the same time, CO reacts with excess water vapor in the raw gas to generate an equal volume of H2, thereby increasing production. Therefore, the performance and activity of the catalyst is one of the main factors directly affecting the efficiency of the coal chemical process.

[0003] At present, the commonly used conversion catalysts include iron-chromium high-temperature conversion catalysts, copper-zinc low-temperature conversion catalysts and cobalt-molybdenum sulfur-resistant conversion catalysts. Although they can catalyze the reaction of CO and a certain amount of water vapor to produce H2, when the raw gas contains too much water, it will cause water to enter the catalyst and affect its activity, causing the catalyst temperature to collapse and agglomerate. In severe cases, it will lead to complete deactivation of the catalyst and system shutdown; in addition, when water enters the catalyst, a dead space can be formed at the bottom of the catalyst, the gas does not flow and condensation water is formed. The corrosive substances contained in the condensation water will corrode the equipment, requiring shutdown and maintenance, which greatly affects production efficiency. Summary of the invention

[0004] In view of the above technical problems, the utility model provides a coal chemical synthesis gas water separation device, which increases the space for water separation by raising the tower body of the water washing tower, arranges a conversion separator for gas-water separation, and arranges a steam heating pipeline on the pipeline in front of the conversion separator, and a gas preheater at the outlet of the conversion separator to reduce condensed water, and an air guide pipe is arranged at the bottom of the conversion furnace to maintain gas flow to avoid the formation of dead space and condensed water, thereby achieving the purpose of preventing water from entering the catalyst layer.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a coal chemical synthesis gas water separation device, the gasification furnace is connected to the water washing tower, the water washing tower is connected to the conversion separator, a gas preheater is provided at the bottom of the conversion separator, the gas preheater is connected to the detoxification tank pipeline, the detoxification tank is connected to the conversion furnace, and the conversion furnace is connected to the gas storage tank pipeline.

[0006] Preferably, a tower tray is provided in the water washing tower.

[0007] Further preferably, the tower tray has 5-7 layers, and the layer spacing of the tower tray is 700-900 mm.

[0008] More preferably, the tower tray has 7 layers, and the distance between the tower tray layers is 900 mm.

[0009] Preferably, a first liquid level gauge and a second liquid level gauge are provided on the upper portion of the conversion separator.

[0010] Preferably, the conversion separator is connected to a stripping tower pipeline, and the stripping tower is connected to a gasifier pipeline.

[0011] Further preferably, a regulating valve is provided on the pipeline between the water washing tower and the conversion separator; and a lifting pump is provided on the pipeline between the stripping tower and the gasifier.

[0012] Preferably, a catalyst layer is provided in the conversion furnace, and an air guide pipe is provided at the bottom.

[0013] More preferably, the catalyst is a catalyst.

[0014] Preferably, a first steam heating pipeline is provided on the pipeline between the gasifier and the water scrubber, and a second steam heating pipeline is provided on the pipeline between the water scrubber and the conversion separator.

[0015] The beneficial effects of the utility model are:

[0016] 1. The tower body of the water scrubber is raised, the number of internal tower plates is increased to 7 layers, and the interlayer spacing is increased to 900mm. The raw gas is deeply cooled, washed and dusted, while increasing the space for water separation, reducing the moisture carried in the raw gas coming out of the water scrubber.

[0017] 2. Steam heating pipes are installed on the pipes between the gasifier and the water scrubber and on the pipes between the water scrubber and the conversion separator to reduce the heat loss of the raw gas and the generation of condensed water.

[0018] 3. A gas preheater is installed at the outlet of the conversion separator to heat the converted gas to a gas dew point temperature of 20°C or above at the pressure to avoid the generation of condensed water, thereby preventing it from entering the conversion furnace and causing water to enter the catalyst layer and affect its activity.

[0019] 4. An air duct is provided at the bottom of the conversion furnace to ensure that the air at the bottom of the conversion furnace remains in a flowing state, avoid the formation of condensed water due to the existence of dead space, prevent corrosion to the conversion furnace, and reduce the maintenance frequency.

[0020] 5. A regulating valve is installed on the pipeline at the inlet of the conversion separator, which can adjust the amount of gas-water mixture entering it, thereby regulating the liquid level of the separator, and the liquid level in the conversion separator is monitored in real time by two liquid level gauges to avoid liquid level distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 11 is a schematic diagram of the structure of the utility model, in which 1 is a gasifier, 2 is a water washing tower, 3 is a gas preheater, 4 is a first liquid level gauge, 5 is a conversion separator, 6 is a stripping tower, 7 is a detoxification tank, 8 is a conversion furnace, 9 is a second liquid level gauge, 10 is a catalyst layer, 11 is a tower plate, 12 is an air guide pipe, 13 is a lifting pump, 14 is a gas storage tank, 15 is a first steam heating pipeline, 16 is a second steam heating pipeline, and 17 is a regulating valve. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further explained below in conjunction with the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of the utility model and should not be understood as limiting the utility model. The protection scope of the utility model shall be based on the content recorded in the claims. Any modification or replacement made by a person skilled in the art to the technical solution of the utility model without creative work shall fall within the protection scope of the utility model.

[0023] Example 1

[0024] like Figure 1 As shown, a coal chemical synthesis gas water separation device, the gasifier 1 is connected to the bottom of the water scrubber 2, the raw gas generated by the gasifier 1 is transported to the water scrubber 2 for cooling, washing and dust removal; the upper part of the water scrubber 2 is connected to the conversion separator 5, the gas-water mixture coming out of the water scrubber 2 is separated to reduce the water content; the bottom of the conversion separator 5 is provided with a gas preheater 3, the gas is heated to a leak point temperature of more than 20°C under pressure to avoid the formation of condensed water; the gas preheater 3 is connected to the detoxification tank 7 pipeline, the detoxification tank 7 is connected to the conversion furnace 8, the conversion furnace 8 is connected to the gas storage tank 14 pipeline, the gas is first detoxified, and then converted in the conversion furnace 8, the gas obtained after the conversion reaction is temporarily stored in the gas storage tank 14, and then discharged in batches.

[0025] Preferably, the water washing tower 2 is a plate-type water washing tower, which is provided with a tower plate 11. After the raw gas generated in the gasification furnace enters the water washing tower 2, it passes through each layer of the tower plate 11 from bottom to top in sequence under the push of the pressure difference and is discharged from the top of the tower, thereby achieving deep washing and dust removal of the raw gas.

[0026] Further preferably, the tower tray 11 has 5-7 layers, and the interlayer spacing of the tower tray 11 is 700-900 mm, so as to increase the space for water separation.

[0027] More preferably, the tower tray 11 has 7 layers, and the layer spacing of the tower tray 11 is 900 mm.

[0028] Preferably, a first liquid level gauge 4 and a second liquid level gauge 9 are provided on the upper portion of the conversion separator 5 to monitor the liquid level in the conversion separator 5 in real time to avoid liquid level distortion.

[0029] Preferably, the conversion separator 5 is connected to the stripping tower 6 by a pipeline, and the stripping tower 6 is connected to the gasifier 1 by a pipeline, and the liquid separated by the conversion separator 5 is sent to the stripping tower 6 for gasification, and then returned to the gasifier 1 for recycling.

[0030] Further preferably, a regulating valve 17 is provided on the pipeline between the water washing tower 2 and the conversion separator 5 to adjust the amount of the gas-water mixture entering the conversion separator 5; a lifting pump 13 is provided on the pipeline between the stripping tower 6 and the gasifier 1 to send the liquid separated by the stripping tower 6 into the stripping tower 6 for gasification.

[0031] Preferably, a catalyst layer 10 is provided in the conversion furnace 8 to catalyze the conversion reaction, and an air guide pipe 12 is provided at the bottom to keep the gas at the bottom of the conversion furnace 8 in a flowing state to avoid the existence of dead space and the formation of condensed water.

[0032] More preferably, the catalyst is a catalyst.

[0033] Preferably, a first steam heating pipeline 15 is provided on the pipeline between the gasifier 1 and the water scrubber 2, and a second steam heating pipeline 16 is provided on the pipeline between the water scrubber 2 and the conversion separator 5, so as to insulate the raw gas, reduce the heat loss of the raw gas and reduce the generation of condensed water.

Claims

1. A coal chemical synthesis gas water separation device, characterized in that: The gasifier (1) is connected to a water scrubber (2), the water scrubber (2) is connected to a conversion separator (5), a gas preheater (3) is provided at the bottom of the conversion separator (5), the gas preheater (3) is connected to a detoxification tank (7) via a pipeline, the detoxification tank (7) is connected to a conversion furnace (8), and the conversion furnace (8) is connected to a gas storage tank (14) via a pipeline.

2. A coal chemical synthesis gas water separation device according to claim 1, characterized in that: The water washing tower (2) is provided with a tower tray (11).

3. A coal chemical synthesis gas water separation device according to claim 2, characterized in that: The tower tray (11) has 5 to 7 layers, and the layer spacing of the tower tray (11) is 700 to 900 mm.

4. A coal chemical synthesis gas water separation device according to claim 1, characterized in that: A first liquid level gauge (4) and a second liquid level gauge (9) are provided on the upper portion of the conversion separator (5).

5. A coal chemical synthesis gas water separation device according to claim 1 or 4, characterized in that: The conversion separator (5) is connected to the stripping tower (6) through a pipeline, and the stripping tower (6) is connected to the gasifier (1) through a pipeline.

6. A coal chemical synthesis gas water separation device according to claim 5, characterized in that: A regulating valve (17) is provided on the pipeline between the water washing tower (2) and the conversion separator (5); and a lifting pump (13) is provided on the pipeline between the stripping tower (6) and the gasifier (1).

7. The coal chemical synthesis gas water separation device according to claim 1, characterized in that: A catalyst layer (10) is provided in the shift furnace (8), and an air guide pipe (12) is provided at the bottom.

8. The coal chemical synthesis gas water separation device according to claim 1, characterized in that: A first steam tracing pipeline (15) is provided on the pipeline between the gasifier (1) and the water scrubber (2), and a second steam tracing pipeline (16) is provided on the pipeline between the water scrubber (2) and the conversion separator (5).

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