Water washing system for high-temperature carbon dioxide

Abstract

The utility model discloses a high-temperature carbon dioxide washing system which comprises a compressor, a high-pressure washing tower, a cooler and a gas-liquid separator, a carbon dioxide inlet pipeline is connected to the high-pressure water washing tower after passing through the compressor, the upper part of the high-pressure water washing tower is connected with a carbon dioxide outlet pipe and a spray head connected with a water inlet of the water washing tower, and a spray water collecting tank is arranged at the lower part of the high-pressure water washing tower; a water outlet of the spray water collecting tank is connected to the cooler through a water washing tower water outlet pipe; a mesh layer sieve plate is arranged in the middle of the interior of the high-pressure water washing tower; the mesh layer sieve plate comprises an upper mesh plate, a lower mesh plate and an inclined mesh plate fixed between the upper mesh plate and the lower mesh plate. According to the utility model, impurities carried by carbon dioxide gas can be fully washed and removed; spraying water and separated water can be recycled for multiple times through heat exchange, and resources are saved.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a water-washing high-temperature carbon dioxide system. Background Art

[0002] Carbon dioxide feed gas contains a variety of impurities, such as water, light hydrocarbons, methanol, sulfur, and more. However, cryogenic distillation and impurity removal equipment is not suitable for carbon dioxide feedstocks with high impurity content. The operating environment temperature is generally around -20 degrees Celsius, requiring large amounts of cooling and energy consumption. Therefore, the carbon dioxide impurity removal process needs to be developed and optimized. After the carbon dioxide is pressurized by the compressor, the gas temperature is very high, generally not less than 140°C. Before the carbon dioxide gas enters the adsorption dryer, it needs to be cooled to ensure that the adsorption dryer inlet temperature does not exceed 40°C.

[0003] Existing industrial carbon dioxide gas treatment methods are complex and difficult to control. They cannot efficiently dehydrate and remove impurities, consume a lot of energy, and are not environmentally friendly. Utility Model Content

[0004] The utility model aims to provide a water-washing system for high-temperature carbon dioxide, which can effectively remove impurities from high-temperature carbon dioxide and save resources.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0006] A water-washed high-temperature carbon dioxide system includes a compressor, a high-pressure water washing tower, a cooler, and a gas-liquid separator;

[0007] A spray head connected to the water inlet of the high-pressure water washing tower is provided in the high-pressure water washing tower. A spray water collecting tank is provided at the lower part of the high-pressure water washing tower. The outlet of the spray water collecting tank is connected to the cooler through the water outlet pipe of the water washing tower.

[0008] A mesh layer sieve plate is provided in the middle of the high-pressure water washing tower; the mesh layer sieve plate comprises an upper mesh plate, a lower mesh plate and an inclined mesh plate fixed between the upper mesh plate and the lower mesh plate;

[0009] The carbon dioxide inlet pipeline after the compressor is connected to the air inlet provided at the lower part of the high-pressure water washing tower, and the air outlet is provided at the upper part of the high-pressure water washing tower, and a gas-liquid separator is provided at the air outlet; the gas-liquid separator has two outlets, which are respectively connected to the gas separation pipeline and the liquid separation pipeline, wherein the gas separation pipeline is the carbon dioxide outlet pipe, and the liquid separation pipeline is connected to the cooler;

[0010] A heat exchange pipeline is provided inside the cooler, and the heat exchange pipeline has a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange pipeline is used to exchange heat with the water outlet pipe of the water washing tower and the liquid separation pipeline; the water outlet pipe of the water washing tower and the liquid separation pipeline are merged and connected to the water inlet pipe of the water washing tower connected to the water inlet of the water washing tower after passing through the cooler.

[0011] To optimize the above technical solutions, specific measures taken also include:

[0012] The inclined mesh plates have an inclination angle of 30°-60°, and the inclined mesh plates are connected end to end in sequence in a cavity formed between the upper mesh plate and the lower mesh plate.

[0013] When there are two or more layers of mesh layer sieve plates, the mesh layer sieve plates are arranged at intervals in the upper and lower parts.

[0014] The gas-liquid separator is provided with a liquid level switch and an automatic drain valve.

[0015] The heat exchange medium inlet is provided with a solenoid valve and an expansion valve, and the heat exchange medium outlet is provided with a temperature sensing package.

[0016] Furthermore, the heat exchange medium outlet of the cooler is connected to the water inlet pipeline of the water washing tower through a pipeline.

[0017] An electromagnetic flow meter and a pressure transmitter are provided on the water inlet pipeline of the water washing tower.

[0018] Furthermore, the heat exchange medium outlet of the cooler is connected to a water tank through another pipeline, and the water tank is provided with a water outlet and a valve.

[0019] The heat exchange medium outlet of the cooler is connected to the water washing tower outlet pipe connected to the water inlet of the water washing tower after passing through the cooler through a pipeline, and a solenoid valve is provided on the pipeline before the merger.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In the utility model, carbon dioxide gas is compressed by a compressor and then enters a high-pressure water washing tower for cooling and dehydration. The high-pressure water washing tower can remove hydrocarbon substances in the carbon dioxide gas; the hydrocarbons in the compressed high-pressure gas are washed with low-temperature water to form hydrates, which are then removed.

[0022] The high-pressure water washing tower is equipped with a mesh layer sieve plate with large mesh holes, which can make the carbon dioxide gas stay briefly, fully wash the impurities carried by the carbon dioxide gas, and effectively remove the impurities; the impurities are collected into the spray water collection tank along with the spray water, and are recycled again after heat exchange, saving resources.

[0023] The high-pressure water scrubber is connected to a cooler to cool the water used for carbon dioxide washing. Refrigerant is used as the cooling medium, and heat exchange is performed through the cooler to cool the washing water, ensuring that the outlet water temperature remains within a certain temperature range. A solenoid valve and expansion valve are installed at the refrigerant inlet, and a temperature-sensing package is installed at the refrigerant outlet. The expansion valve opening is automatically adjusted based on changes in pressure and temperature, thereby controlling the refrigerant flow.

[0024] The gas-liquid separator configured at the gas outlet can discharge the precipitated liquid water in time. The separated liquid water can also be recycled after heat exchange, saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 : The structural diagram of the water-washing high-temperature carbon dioxide system of the present invention.

[0026] Figure 2 : Schematic diagram of the mesh plate structure of the upper mesh plate, the lower mesh plate and the inclined mesh plate.

[0027] In the figure: 1- compressor, 2- high-pressure water scrubber, 3- cooler, 4- gas-liquid separator, 5- spray water collection tank, 6- upper mesh plate, 7- lower mesh plate, 8- inclined mesh plate, 9- water storage tank, 10- water scrubber inlet pipe, 11- heat exchange medium inlet, 12- heat exchange medium outlet, 13- water scrubber outlet pipe, 14- liquid separation pipeline, 15- gas separation pipeline. DETAILED DESCRIPTION

[0028] The above contents of the present invention are further described in detail below in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments. All technologies implemented based on the above contents of the present invention belong to the scope of the present invention.

[0029] The utility model provides a water-washing high-temperature carbon dioxide system, such as Figure 1 As shown, it includes a compressor 1, a high-pressure water washing tower 2, a cooler 3 and a gas-liquid separator 4;

[0030] The mesh layer sieve plate is provided in the middle of the high-pressure water washing tower 2; the mesh layer sieve plate includes an upper mesh plate 6, a lower mesh plate 7 and an inclined mesh plate 8 fixed between the upper mesh plate 6 and the lower mesh plate 7. The mesh plate structure is as follows Figure 2 In the embodiment, the mesh layer sieve plate can make the carbon dioxide gas stay briefly, fully wash the impurities carried by the carbon dioxide gas, and effectively remove the impurities; the impurities are collected into the spray water collection tank 5 along with the spray water, and are recycled after heat exchange, saving resources.

[0031] The inclined mesh plates 8 have an inclination angle of 30°-60° and are connected end to end in the cavity formed between the upper mesh plate 6 and the lower mesh plate 7. When there are two or more mesh layer sieve plates, the mesh layer sieve plates are arranged at intervals in the upper and lower layers.

[0032] The carbon dioxide inlet pipeline after passing through the compressor 1 is connected to the lower air inlet of the high-pressure water scrubber 2, and the upper air outlet of the high-pressure water scrubber 2 is connected to the carbon dioxide outlet pipe, where a gas-liquid separator 4 is also provided; a spray head connected to the water inlet of the water scrubber is provided in the high-pressure water scrubber, and a spray water collection tank 5 is provided at the lower part of the high-pressure water scrubber 2; the water outlet of the spray water collection tank 5 is connected to the cooler 3 through the water scrubber outlet pipe 13;

[0033] The outlets of the gas-liquid separator 4 are respectively a gas separation pipeline 15 and a liquid separation pipeline 14, and the liquid separation pipeline 14 enters the cooler 3. The gas-liquid separator 4 configured at the gas outlet can discharge the precipitated liquid water in time, and the liquid water can be recycled and reused after heat exchange, saving resources.

[0034] A heat exchange pipeline is provided inside the cooler 3 , and the heat exchange pipeline has a heat exchange medium inlet 11 and a heat exchange medium outlet 12 ; the heat exchange pipeline is used to exchange heat with the water washing tower outlet pipe 13 and the liquid separation pipeline 14 .

[0035] In the embodiment, the gas-liquid separator 4 is equipped with an automatic drain valve, which is provided with a liquid level switch for draining water and sealing gas to prevent carbon dioxide gas from being discharged, and to reduce noise caused by drainage.

[0036] The water washing tower outlet pipe 13 passes through the cooler 3 and is connected to the water washing tower water inlet pipe 10 connected to the water washing tower water inlet. The water washing tower water inlet pipe 10 is provided with a water pump, and a check valve, a pressure gauge and a temperature measuring device are provided after the water pump.

[0037] In the present invention, cooler 3 cools the water used for carbon dioxide washing to form low-temperature water. Using a refrigerant as the cooling medium, heat exchange is performed through cooler 3 to ensure that the outlet water temperature remains within a certain temperature range. After passing through the cooler, the water scrubber outlet pipe 13 and the liquid separation pipe 14 are combined and connected to the water scrubber inlet pipe 10 connected to the water scrubber water inlet.

[0038] The heat exchange medium outlet 12 of the cooler 3 is merged with the water inlet pipeline 10 of the water washing tower through a pipeline, and a solenoid valve is provided on the pipeline before the merger.

[0039] The heat exchange medium outlet 12 of the cooler 3 is connected to the water tank 9 through another pipeline, and a solenoid valve is provided on the pipeline; the water tank 9 is provided with a water outlet and a valve.

[0040] By switching the two pipelines, it is selected whether the heat exchange medium is combined with other liquids to enter the high-pressure water washing tower 2.

[0041] In the embodiment, an electromagnetic flowmeter and a pressure transmitter are further provided on the water inlet pipe 10 of the water washing tower.

[0042] In the embodiment, a solenoid valve and an expansion valve are provided at the heat exchange medium inlet 11, and a temperature sensing package is provided at the heat exchange medium outlet 12. The opening of the expansion valve is automatically adjusted by changes in pressure and temperature, thereby controlling the flow of the refrigerant.

[0043] The working process of this utility model is as follows:

[0044] The carbon dioxide gas to be treated is compressed into high-pressure gas by compressor 1 and enters high-pressure water scrubber 2. High-pressure water scrubber 2 retains and washes the carbon dioxide gas through spraying and mesh layer sieve plates to wash away impurities and cool the carbon dioxide gas. The carbon dioxide gas at the outlet undergoes gas-liquid separation treatment; the liquid generated by the gas-liquid separation treatment and the accumulated water generated by spraying at the bottom of the water scrubber can be connected back to the high-pressure water scrubber 2 for repeated use after heat exchange through cooler 3.

[0045] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent replacement and improvement made by any technician familiar with the profession to the above embodiment without departing from the scope of the technical solution of the present invention and based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A water-washed high-temperature carbon dioxide system, characterized by: Including compressor, high-pressure water scrubber, cooler and gas-liquid separator; A spray head connected to the water inlet of the high-pressure water washing tower is provided in the high-pressure water washing tower. A spray water collecting tank is provided at the lower part of the high-pressure water washing tower. The outlet of the spray water collecting tank is connected to the cooler through the water outlet pipe of the water washing tower. A mesh layer sieve plate is provided in the middle of the high-pressure water washing tower; the mesh layer sieve plate comprises an upper mesh plate, a lower mesh plate and an inclined mesh plate fixed between the upper mesh plate and the lower mesh plate; The carbon dioxide inlet pipeline after the compressor is connected to the air inlet provided at the lower part of the high-pressure water washing tower, and the air outlet is provided at the upper part of the high-pressure water washing tower, and a gas-liquid separator is provided at the air outlet; the gas-liquid separator has two outlets, which are respectively connected to the gas separation pipeline and the liquid separation pipeline, wherein the gas separation pipeline is the carbon dioxide outlet pipe, and the liquid separation pipeline is connected to the cooler; A heat exchange pipeline is provided inside the cooler, and the heat exchange pipeline has a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange pipeline is used to exchange heat with the water outlet pipe of the water washing tower and the liquid separation pipeline; the water outlet pipe of the water washing tower and the liquid separation pipeline are merged and connected to the water inlet pipe of the water washing tower connected to the water inlet of the water washing tower after passing through the cooler.

2. The water-washed high-temperature carbon dioxide system according to claim 1, characterized in that: The inclined mesh plates have an inclination angle of 30°-60°, and the inclined mesh plates are connected end to end in sequence in a cavity formed between the upper mesh plate and the lower mesh plate.

3. The water-washed high-temperature carbon dioxide system according to claim 1, characterized in that: When there are two or more layers of mesh layer sieve plates, the mesh layer sieve plates are arranged at intervals in the upper and lower parts.

4. The water-washed high-temperature carbon dioxide system according to claim 1, characterized in that: The gas-liquid separator is provided with a liquid level switch and an automatic drain valve.

5. The water-washed high-temperature carbon dioxide system according to claim 1, characterized in that: The heat exchange medium inlet is provided with a solenoid valve and an expansion valve, and the heat exchange medium outlet is provided with a temperature sensing package.

6. The water-washed high-temperature carbon dioxide system according to claim 1, characterized in that: The heat exchange medium outlet of the cooler is connected to the water inlet pipeline of the water washing tower through a pipeline.

7. The water-washed high-temperature carbon dioxide system according to claim 1 or 6, characterized in that: An electromagnetic flow meter and a pressure transmitter are provided on the water inlet pipeline of the water washing tower.

8. The water-washed high-temperature carbon dioxide system according to claim 1, characterized in that: The heat exchange medium outlet of the cooler is connected to a water storage tank through another pipeline, and the water storage tank is provided with a water outlet and a valve.

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