Ice maker refrigeration integrated device for coal chemical industry production device

Abstract

The utility model belongs to the technical field of refrigeration integration of production devices in the coal chemical industry, and particularly relates to an ice maker refrigeration integration device for the production devices in the coal chemical industry, which provides cooling capacity for devices needing to be cooled in the production devices in the coal chemical industry in a centralized manner by arranging a centralized ice maker refrigeration device, so that the production process is simple and easy to operate; the energy consumption in the operation process is low, and the production cost is low; according to the utility model, the liquid ammonia flash tank and the liquid ammonia subcooler are arranged, so that the temperature of liquid ammonia is further reduced, and a lower temperature is provided for a subsequent cooling device; according to the utility model, the evaporative condenser is arranged, and compressed ammonia gas is cooled by using air in winter, so that the consumption of circulating water is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of integrated refrigeration technology for coal chemical production equipment, specifically an integrated refrigeration device for ice machines used in coal chemical production equipment. Background Technology

[0002] As a crucial pathway for the deep transformation and comprehensive utilization of coal resources, the coal chemical industry has achieved remarkable results in technological innovation and industrial chain extension in recent years. New coal chemical technologies, such as coal gasification, coal-to-oil, and coal-to-natural gas, have not only improved the utilization efficiency of coal resources but also reduced environmental pollution. Simultaneously, the synergistic effect of the upstream and downstream of the coal chemical industry chain is gradually emerging, forming a complete system from coal mining and processing to the sale of end products, enhancing the overall competitiveness of the industry. In the future, the development of the coal chemical industry will focus more on clean transformation and the circular economy. On the one hand, by deepening the integration with new energy technologies and carbon capture and storage technologies, low-carbon and efficient coal chemical production processes will be developed to reduce greenhouse gas emissions and achieve green development of coal resources. On the other hand, with the promotion of the circular economy concept, the coal chemical industry will strengthen the comprehensive utilization of by-products, such as the resource utilization of coal tar and coal gangue, building a circular economy system that couples multiple industries, including coal, electricity, chemicals, and building materials. Furthermore, with the adjustment of the national energy structure, the coal chemical industry will explore integration with renewable energy, hydrogen energy, and other emerging energy sources to achieve diversified energy supply and ensure national energy security.

[0003] However, the separation and purification of many substances in coal chemical production facilities need to be carried out in a low-temperature environment, requiring refrigeration equipment to provide cooling. For example, the shift gas and non-shift gas produced by coal gasification are desulfurized and decarbonized by methanol at low temperatures, and the exhaust gas from the top of the ethylene glycol distillation column is cooled, as are the methanol liquid from the methyl nitrite recovery unit, the distillation exhaust gas from the dimethyl carbonate recovery unit, and the exhaust gas from the top of the methanol dehydration section of the distillation column. Since each cooling unit is located separately, setting up refrigeration equipment separately would complicate the production process, and would also result in high energy consumption and high production costs during operation. Utility Model Content

[0004] Based on the existing technical problems, this utility model provides an integrated refrigeration device for ice machines in coal chemical production plants. This utility model integrates the low-temperature cooling devices of coal chemical enterprises and sets up a centralized refrigeration unit to provide cooling capacity, thereby simplifying the production process and reducing refrigeration energy consumption.

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

[0006] An integrated refrigeration device for a coal chemical production plant includes a compressor, a liquid ammonia buffer tank, a liquid ammonia flash evaporation tank, a liquid ammonia subcooler, a liquid ammonia evaporator, and a low-temperature methanol-ammonia washing and cooling device. Three compressors are connected in series: compressor a, compressor b, and compressor c. Gas-liquid separators a, b, and c are respectively installed on the inlet pipes of the three compressors. The liquid ammonia outlets of gas-liquid separators a, b, and c are connected to the liquid ammonia buffer tank via liquid ammonia pump a, b, c, and pipes, respectively. Coolers a, b, and c are respectively installed on the outlet pipes of the three compressors. Cooler c is connected to the inlet of the liquid ammonia buffer tank via a pipe, and the outlet of the liquid ammonia buffer tank is connected via a pipe. The liquid ammonia flash tank's inlet is connected to the inlet of gas-liquid separator b via a pipeline. The liquid ammonia outlet of the flash tank is divided into three paths via pipelines: the first path connects to the tube-side inlet of the liquid ammonia subcooler, the second path connects to the shell-side inlet of the subcooler, and the third path connects to the tube-side inlet of the liquid ammonia evaporator. The tube-side outlet of the subcooler connects to the liquid ammonia inlet of the low-temperature methanol washing ammonia cooling device via a pipeline. The shell-side inlet of the evaporator connects to the outlet of the ethylene glycol cooling device via a pipeline. The inlet of the ethylene glycol cooling device connects to the shell-side outlet of the evaporator. The shell-side outlet of the subcooler, the gas-liquid outlet of the low-temperature methanol washing ammonia cooling device, and the tube-side outlet of the evaporator are all connected to the inlet of gas-liquid separator a via pipelines.

[0007] Furthermore, the coolers a, b, and c are respectively equipped with parallel evaporative condensers a, b, and c.

[0008] Furthermore, an evaporative condenser d is installed on the pipe connecting the cooler c to the liquid ammonia buffer tank.

[0009] Furthermore, the tube-side outlet of the liquid ammonia subcooler is also connected to the tube-side inlet of the liquid ammonia evaporator via a pipeline.

[0010] Furthermore, the cooling medium of the ethylene glycol cooling device is ethylene glycol, and the ethylene glycol cooling device is an ethylene glycol distillation column top cooler and / or a methanol cooler of a methyl nitrite recovery unit and / or a dehydrogenation column top cooler of a dimethyl carbonate recovery unit and / or a dimethyl carbonate separation column top cooler and / or a methanol dehydration column top vent cooler.

[0011] Furthermore, the compressor is driven by an electric motor or a steam turbine.

[0012] Furthermore, the liquid ammonia buffer tank, cooler c, and evaporator condenser d are all equipped with non-condensable vapor discharge pipes. Beneficial effects

[0013] 1. This utility model provides centralized cooling to the cooling devices in coal chemical production facilities by setting up a centralized refrigeration device, which simplifies the production process, makes it easy to operate, and reduces energy consumption and production costs during operation.

[0014] 2. This utility model further reduces the temperature of liquid ammonia by setting up a liquid ammonia flash evaporation tank and a liquid ammonia subcooler, thereby providing a lower temperature for subsequent cooling devices.

[0015] 3. By setting up an evaporative condenser, this utility model uses air to cool compressed ammonia gas in winter, thereby reducing the consumption of circulating water. Attached Figure Description

[0016] Figure 1 Here is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram (b) of the structure of this utility model;

[0018] Figure 3 c is a schematic diagram of the structure of this utility model;

[0019] In the diagram: 1-Gas-liquid separator a; 2-Compressor a; 3-Cooler a; 4-Liquid ammonia pump a; 5-Gas-liquid separator b; 6-Compressor b; 7-Cooler b; 8-Liquid ammonia pump b; 9-Gas-liquid separator c; 10-Compressor c; 11-Cooler c; 12-Liquid ammonia pump c; 13-Evaporator-condenser d; 14-Liquid ammonia buffer tank; 15-Liquid ammonia flash evaporation tank; 16-Liquid ammonia subcooler; 17-Low-temperature methanol ammonia washing and cooling device; 18-Ethylene glycol cooling device. Detailed Implementation Example 1

[0020] Reference Figure 1To optimize the cooling requirements of equipment in coal chemical production processes and reduce operating energy consumption, this utility model provides an integrated refrigeration device for coal chemical production equipment, including a compressor, a liquid ammonia buffer tank 14, a liquid ammonia flash evaporation tank 15, a liquid ammonia subcooler 16, a liquid ammonia evaporator, and a low-temperature methanol washing ammonia cooling device 17. Three compressors are connected in series, and the compressors are driven by electric motors. The three compressors are compressor a2, compressor b6, and compressor c10. Gas-liquid separators a1, b5, and c9 are respectively installed on the inlet pipes of the three compressors to separate the liquid ammonia from the gaseous ammonia entering the three compressors. The liquid ammonia outlet of gas-liquid separator a1 and the gas-liquid separator c9 are connected to the gas-liquid separator. The liquid ammonia outlets of compressor b5 and gas-liquid separator c are connected to liquid ammonia buffer tank 14 via liquid ammonia pumps a4, b8, and c12, respectively, and pipelines. Coolers a3, b7, and c11 are installed on the outlet pipelines of the three compressors. Cooler c11 is connected to the inlet of liquid ammonia buffer tank 14 via a pipeline. The outlet of liquid ammonia buffer tank 14 is connected to the inlet of liquid ammonia flash tank 15 via a pipeline. The gaseous ammonia outlet of liquid ammonia flash tank 15 is connected to the inlet of gas-liquid separator b5 via a pipeline, allowing the liquid ammonia to flash and cool within the liquid ammonia flash tank 15. The flashed gaseous ammonia is sent to gas-liquid separator b5 for gas-liquid separation, and then enters compressor b6 for cyclic compression. The liquid ammonia outlet of liquid ammonia flash tank 15 is connected to the inlet of gas-liquid separator b6 via a pipeline. The system is divided into three paths. The first path connects to the tube-side inlet of the liquid ammonia subcooler via a pipeline. The second path connects to the shell-side inlet of the liquid ammonia subcooler 16 via a pipeline, where the liquid ammonia vaporizes and absorbs heat in the shell side, cooling the liquid ammonia in the tube side. The third path connects to the tube-side inlet of the liquid ammonia evaporator via a pipeline. The tube-side outlet of the liquid ammonia subcooler 16 is connected to the liquid ammonia inlet of the low-temperature methanol washing ammonia cooling device 17 via a pipeline, cooling the lean methanol, rich methanol, and semi-lean methanol in the low-temperature methanol washing device. The shell-side inlet of the liquid ammonia evaporator is connected to the outlet of the ethylene glycol cooling device 18 via a pipeline, and the inlet of the ethylene glycol cooling device 18 is connected to the shell-side outlet of the liquid ammonia evaporator via a pipeline. After the liquid ammonia cools the ethylene glycol, the ethylene glycol is then sent to the ethylene glycol cooling device 17. 8 serves as a cold source; the cooling medium of the ethylene glycol cooling device 18 is ethylene glycol, and the ethylene glycol cooling device 18 is a top cooler for the ethylene glycol distillation column and / or a methanol cooler for the methyl nitrite recovery unit and / or a top cooler for the dehydrogenation column of the dimethyl carbonate recovery unit and / or a top cooler for the dimethyl carbonate separation column and / or a top vent cooler for the methanol dehydration column; the shell-side outlet of the liquid ammonia subcooler 16, the gaseous ammonia outlet of the low-temperature methanol washing ammonia cooling device 17, and the tube-side outlet of the liquid ammonia evaporator are all connected to the inlet of the gas-liquid separator a1 through pipelines; so that the heat-absorbing and vaporized gaseous ammonia re-enters the compressor for compression and cyclic refrigeration; the liquid ammonia buffer tank, cooler c, and evaporator condenser d are all equipped with non-condensable vapor discharge pipes to discharge non-condensable gases in the system.

[0021] Reference Figure 2 The difference between Example 2 and Example 1 is that: an evaporator condenser d13 is installed on the pipe connecting the cooler c11 and the liquid ammonia buffer tank 14 to further reduce the temperature of the liquid ammonia. While meeting the cooling requirements of the low-temperature methanol washing ammonia cooling device 17 and the ethylene glycol cooling device 18, the circulation volume of liquid ammonia vaporization in the liquid ammonia flash tank 15 and the liquid ammonia subcooler 16 is reduced, thereby reducing the power consumption or steam consumption of the compressor drive.

[0022] Reference Figure 3 The difference between Example 3 and Example 2 is that the tube outlet of the liquid ammonia subcooler 16 is also connected to the tube inlet of the liquid ammonia evaporator through a pipe. A regulating valve is installed on the pipe connecting the tube outlet of the liquid ammonia subcooler 16 and the tube inlet of the liquid ammonia evaporator, so that the liquid ammonia subcooled by the liquid ammonia subcooler 16 can cool and lower the temperature of ethylene glycol, thereby flexibly adjusting the cooling requirements of the low-temperature methanol washing ammonia cooling device 17 and the ethylene glycol cooling device 18.

[0023] The difference between Example 4 and Example 1 is that: the coolers a3, b7, and c11 are respectively equipped with parallel evaporative condensers a, b, and c. In winter when the temperature is low, the compressed ammonia gas is cooled by air through the evaporative condensers.

[0024] The difference between Example 5 and Example 1 is that the driving device of the compressor is a steam turbine.

[0025] 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. An integrated refrigeration device for ice machines in coal chemical production plants, characterized in that: The system includes a compressor, a liquid ammonia buffer tank, a liquid ammonia flash evaporation tank, a liquid ammonia subcooler, a liquid ammonia evaporator, and a low-temperature methanol-ammonia washing and cooling device. Three compressors are connected in series: compressor a, compressor b, and compressor c. Gas-liquid separators a, b, and c are respectively installed on the inlet pipes of the three compressors. The liquid ammonia outlets of gas-liquid separators a, b, and c are connected to the liquid ammonia buffer tank via liquid ammonia pumps a, b, and c, and by pipelines, respectively. Coolers a, b, and c are respectively installed on the outlet pipes of the three compressors. Cooler c is connected to the inlet of the liquid ammonia buffer tank via a pipeline, and the outlet of the liquid ammonia buffer tank is connected to the inlet of the liquid ammonia flash evaporation tank via a pipeline. The gaseous ammonia outlet of the ammonia flash evaporator is connected to the inlet of gas-liquid separator b via a pipeline. The liquid ammonia outlet of the liquid ammonia flash evaporator is divided into three pipelines: the first pipeline connects to the tube-side inlet of the liquid ammonia subcooler, the second pipeline connects to the shell-side inlet of the liquid ammonia subcooler, and the third pipeline connects to the tube-side inlet of the liquid ammonia evaporator. The tube-side outlet of the liquid ammonia subcooler is connected to the liquid ammonia inlet of the low-temperature methanol washing ammonia cooling device via a pipeline. The shell-side inlet of the liquid ammonia evaporator is connected to the outlet of the ethylene glycol cooling device via a pipeline. The inlet of the ethylene glycol cooling device is connected to the shell-side outlet of the liquid ammonia evaporator via a pipeline. The shell-side outlet of the liquid ammonia subcooler, the gaseous ammonia outlet of the low-temperature methanol washing ammonia cooling device, and the tube-side outlet of the liquid ammonia evaporator are all connected to the inlet of gas-liquid separator a via pipelines.

2. The integrated refrigeration device for ice-making in coal chemical production facilities according to claim 1, characterized in that: The compressor is driven by an electric motor or a steam turbine.

3. The integrated refrigeration device for ice-making in coal chemical production facilities according to claim 1, characterized in that: The coolers a, b, and c are respectively equipped with parallel evaporator-condenser a, evaporator-condenser b, and evaporator-condenser c.

4. The integrated refrigeration device for ice-making in coal chemical production facilities according to claim 1, characterized in that: An evaporative condenser d is installed on the pipeline connecting the cooler c to the liquid ammonia buffer tank.

5. An integrated refrigeration device for ice-making in coal chemical production facilities according to any one of claims 1-4, characterized in that: The tube-side outlet of the liquid ammonia subcooler is also connected to the tube-side inlet of the liquid ammonia evaporator via a pipeline.

6. The integrated refrigeration device for ice-making in coal chemical production plants according to claim 5, characterized in that: The cooling medium of the ethylene glycol cooling device is ethylene glycol, and the ethylene glycol cooling device is an ethylene glycol distillation column top cooler and / or a methanol cooler of a methyl nitrite recovery unit and / or a dehydrogenation column top cooler of a dimethyl carbonate recovery unit and / or a dimethyl carbonate separation column top cooler and / or a methanol dehydration column top vent cooler.

7. An integrated refrigeration device for ice-making in coal chemical production facilities according to claim 6, characterized in that: The liquid ammonia buffer tank, cooler c, and evaporator condenser d are all equipped with non-condensable vapor discharge pipes.

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