Device for purifying coal gasification high-pressure flash steam

Abstract

The utility model belongs to the technical field of coal gasification high-pressure flash steam purification, and particularly relates to a coal gasification high-pressure flash steam purification device. The purification section is arranged above the heat exchange section of the hot water tower, high-pressure flash steam subjected to heat exchange with grey water is washed and purified, ammonium salt and ash in the high-pressure flash steam are removed, meanwhile, the flushing device is arranged on the cooler, the tube pass of the cooler is flushed, and the heat exchange efficiency is improved. Ammonium salt and ash attached to the inner wall of the cooler tube pass are flushed, so that the cooler tube pass can be efficiently prevented from being blocked; and the cooled high-pressure flash steam is subjected to gas-liquid separation, so that ammonium salt, ash and moisture in the high-pressure flash steam are greatly reduced, the high-pressure flash steam is purified and fed into a compressor, and the load and damage frequency of the compressor are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of coal gasification high-pressure flash steam purification technology, specifically a device for coal gasification high-pressure flash steam purification. Background Technology

[0002] Coal-water slurry gasification technology, as one of the core technologies of the coal chemical industry, converts the organic matter in coal into combustible gases through high temperature, high pressure, and the action of catalysts, offering significant advantages such as high efficiency, environmental friendliness, and energy conservation. Currently, this technology has become an indispensable clean energy technology for industries such as power, chemicals, and metallurgy. my country has reached the international advanced level in the research and application of coal-water slurry gasifiers, successfully achieving large-scale industrial production, improving the utilization efficiency of coal resources, and reducing environmental pollution.

[0003] However, in large-scale industrial production, the syngas scrubbing tower of a coal-water slurry gasification unit generates a large amount of high-temperature, high-pressure black water. This black water contains a large amount of syngas and a small amount of toxic and harmful gases, which need to be desorbed by a high-pressure flash evaporation unit. The desorbed gas is called high-pressure flash vapor. Because of its high temperature, the main components of high-pressure flash vapor are carbon monoxide and hydrogen. It needs to recover heat in a hot water tower before being sent to downstream non-conversion units for efficient utilization. However, the high-pressure flash vapor exiting the hot water tower contains ammonium salts, ash, and has a high water content, which can easily clog equipment and damage compressors. The high water content also increases the compressor load, hindering its pressurization and delivery to downstream non-conversion units. When equipment is clogged, the high-pressure flash vapor is sent to a flare for incineration, resulting in resource waste. Utility Model Content

[0004] Based on the existing technical problems, this utility model provides a device for purifying high-pressure flash steam from coal gasification. This utility model results in low temperature of high-pressure flash steam flowing out of the hot water tower, with less ash, ammonia, and water content, making it less likely to clog equipment and reducing the load on the compressor. At the same time, it ensures stable operation of the coal-water slurry gasification device and avoids resource waste caused by burning high-pressure flash steam.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A device for purifying high-pressure flash steam from coal gasification includes a hot water tower, a cooler, and a gas-liquid separator. The high-pressure flash steam inlet of the hot water tower is connected to the outlet of the high-pressure flash steam generator via a high-pressure flash steam pipeline. The high-pressure flash steam outlet of the hot water tower is connected to the cooler via a pipeline. The high-pressure flash steam outlet of the cooler is connected to the gas-liquid separator via a pipeline. The high-pressure flash steam outlet of the gas-liquid separator is connected to the compressor inlet via a pipeline.

[0007] Furthermore, the hot water tower is equipped with a purification section and a heat exchange section, with the purification section positioned above the heat exchange section.

[0008] Furthermore, packing material is installed in both the purification section and the heat exchange section of the hot water tower.

[0009] Furthermore, a purified water circulation inlet is provided above the purification section, and a purified water collection device is provided below the packing material of the purification section. The purified water collection device is connected to the purified water circulation buffer tank through a pipeline. The outlet of the purified water circulation buffer tank is connected to the inlet of the purified water circulation pump through a pipeline. The outlet of the purified water circulation pump is connected to the purified water circulation inlet above the purification section through a pipeline. An ash water inlet is provided between the purified water collection device of the hot water tower and the heat exchange section, and an ash water outlet is provided at the bottom of the hot water tower. The outlet of the purified water circulation pump is also connected to the top of the packing material of the heat exchange section through a pipeline.

[0010] Furthermore, the cooler is a single-pass cooler, and the cooler is vertically arranged, with a flushing device installed above the tube side of the vertical cooler.

[0011] Furthermore, pressure sensors are installed on both the high-pressure flash steam inlet and outlet pipes of the cooler.

[0012] Furthermore, a purified water inlet and a purified water supply pipe are provided above the packing material of the hot water tower purification section. Beneficial effects

[0013] This invention features a purification section above the heat exchange section of a hot water tower. This section washes and purifies the high-pressure flash steam after heat exchange with ash water, removing ammonium salts and ash. Simultaneously, a flushing device is installed on the cooler to flush the tubes, removing ammonium salts and ash adhering to the inner walls of the tubes, thus effectively preventing tube blockage. The cooled high-pressure flash steam undergoes gas-liquid separation, significantly reducing the ammonium salts, ash, and moisture content. This purified high-pressure flash steam is then fed into the compressor, reducing the compressor's load and frequency of damage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] In the diagram: 1-Hot water tower; 2-Purification section; 3-Grey water pipe a; 4-Heat exchange section; 5-High-pressure flash steam pipe; 6-Grey water pipe b; 7-Purified water circulation buffer tank; 8-Purified water circulation pump; 9-Purified water collection device; 10-Cooler; 11-Flushing pipe; 12-Gas-liquid separator; 13-Compressor. Detailed Implementation Example 1

[0016] Reference Figure 1In order to ensure that the high-pressure flash steam of the coal chemical gasification unit can be smoothly and efficiently fed into the non-conversion unit for recycling, and to avoid equipment blockage and waste of high-pressure flash steam caused by venting and incineration, while reducing the load on compressor 13 and reducing production costs. This utility model provides a device for purifying high-pressure flash steam in coal gasification, including a hot water tower 1, a cooler 10, and a gas-liquid separator 12. The high-pressure flash steam inlet of the hot water tower 1 is connected to the outlet of the high-pressure flash steam separator via a high-pressure flash steam pipe 5. The high-pressure flash steam outlet of the hot water tower 1 is connected to the cooler 10 via a pipe. By lowering the temperature of the high-pressure flash steam, the saturated water in it condenses into liquid, facilitating subsequent separation processing. The cooler 10 employs a highly efficient cooling method to ensure stable and reliable cooling effect. The high-pressure flash steam outlet of the cooler 10 is connected to the gas-liquid separator 12 via a pipe, and the high-pressure flash steam outlet of the gas-liquid separator 12 is connected to the inlet of a compressor 13 via a pipe. The hot water tower 1 is equipped with a purification section 2 and a heat exchange section 4. The purification section 2 is located above the heat exchange section 4. The purification section 2 is filled with multiple layers of packing material. Ammonium salts and ash in the high-pressure flash steam are removed by washing with water, while simultaneously cooling the high-pressure flash steam. Both the purification section 2 and the heat exchange section 4 of the hot water tower 1 are filled with packing material. A high-pressure flash steam inlet is located below the packing material in the heat exchange section and connected to the high-pressure flash steam pipe 5. The bottom of the hot water tower 1 is equipped with... The grey water outlet is connected to grey water pipe b6; a purified water circulation inlet and a purified water makeup inlet are installed above the purification section 2, and the purified water makeup inlet is connected to the purified water makeup pipe; a purified water collection device 9 is installed below the packing of the purification section 2, and the purified water collection device 9 is connected to the purified water circulation buffer tank 7 through a pipe. The outlet of the purified water circulation buffer tank 7 is connected to the inlet of the purified water circulation pump 8 through a pipe, and the outlet of the purified water circulation pump 8 is connected to the purified water circulation inlet above the purification section 2 through a pipe. The purified water collection device 9 of the hot water tower 1 is connected to the heat exchange section 4. A grey water inlet is provided, which is connected to grey water pipe a3; the outlet of the purified water circulation pump 8 is also connected to the top of the heat exchange section packing through a pipe; the cooler 10 is a single-pass cooler 10, and the cooler 10 is vertically installed, with a flushing device connected to the flushing pipe 11 above the tube side of the vertical cooler 10; pressure sensors are installed on both the high-pressure flash steam inlet pipe and the outlet pipe of the cooler 10 to monitor the pressure difference between the high-pressure flash steam entering and leaving the cooler 10 in real time, so as to flush the cooler 10 in time and ensure the efficient operation of the cooler 10.

[0017] The working material of this utility model: Through the synergistic effect of multiple stages such as washing and purification, cooling and gas-liquid separation, this utility model can effectively remove ammonium salts, ash and moisture from high-pressure flash steam in coal gasification, improve the purification effect, and realize the efficient recovery and utilization of high-pressure flash steam resources. It ensures the stable operation of the high-pressure flash steam recovery device and avoids the waste of resources caused by the venting and burning of high-pressure flash steam due to equipment failure.

[0018] Modifications and variations made to this invention by those skilled in the art are all within the scope of the patent of this invention, and are not limited to the embodiments described.

Claims

1. A device for high pressure flash gas purification of coal gasification, characterized in that: The hot water tower, the cooler, and the gas-liquid separator are connected by high-pressure flash gas pipelines.

2. The device for purifying high-pressure flash gas of coal gasification according to claim 1, characterized in that: The purification section is arranged above the heat exchange section.

3. The device for purifying high pressure flash gas of coal gasification according to claim 1, characterized in that: Fillers are arranged in the purification section and the heat exchange section.

4. The device for purifying high-pressure flash gas of coal gasification according to any one of claims 1 to 3, characterized in that: A purified water circulation inlet is arranged above the purification section, and a purified water collecting device is arranged below the fillers in the purification section.

5. The device for purifying high pressure flash gas of coal gasification according to claim 4, characterized in that: The purified water collecting device is connected to a purified water circulation buffer tank by a pipeline.

6. The device for purifying high-pressure flash gas of coal gasification according to claim 5, characterized in that: The outlet of the purified water circulation buffer tank is connected to the inlet of a purified water circulation pump by a pipeline.

7. The device for purifying high pressure flash gas of coal gasification according to claim 5, characterized in that: The outlet of the purified water circulation pump is connected to the purified water circulation inlet above the purification section by a pipeline. A grey water inlet is arranged between the purified water collecting device and the heat exchange section in the hot water tower. The outlet of the purified water circulation pump is also connected to the space above the fillers in the heat exchange section by a pipeline. A pressure sensor is arranged on the high-pressure flash gas inlet pipeline and the outlet pipeline of the cooler.

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