Reaction gas cooling device

Abstract

The utility model belongs to the technical field of chemical production equipment, and relates to a reaction gas cooling device which comprises a circulating water condenser, the circulating water condenser is connected with a gas inlet pipeline, an exhaust pipeline, a circulating cold water pipe and a circulating hot water pipe, and the circulating hot water pipe is connected with a liquid separation tank; an inlet of the liquid separation tank is connected with the circulating hot water pipe through a liquid inlet pipeline, a liquid outlet of the liquid separation tank is connected with the circulating hot water pipe through a circulating water pipe, and a gas outlet of the liquid separation tank is connected with the compressor through a reaction gas pipe; the joint of the liquid inlet pipeline and the circulating hot water pipe is close to the circulating water condenser, and the joint of the circulating water pipe and the circulating hot water pipe is far away from the circulating water condenser. The utility model has the advantages that leaked media can be separated from circulating water, shutdown caused by leakage is avoided, and the quality of the circulating water can be kept.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production equipment, and relates to a reaction gas cooling device, which is particularly suitable for solving the leakage problem of the circulating water heat exchanger of the reaction gas in the MTO device. Background Art

[0002] When the MTO (olefin separation) device operates, high-temperature reaction gas will be generated. Usually, a cooling device is designed to cool down the reaction gas, and a circulating water condenser is commonly used. However, the circulating water condenser will have a leakage problem during use.

[0003] The leakage of the circulating water heat exchanger is an important factor affecting the quality of the circulating water in the refining and chemical enterprises. It is very important to analyze the reasons for the internal leakage and find solutions. This is because, after the process medium leaks, it is easy to form an oil film on the surface of the tube wall of the heat exchange equipment, thus affecting the heat transfer and cooling effect of the equipment. In addition, the leaked medium combines with the suspended solids in the circulating water to form dirt, especially in the parts where the water flow is slower, the dirt deposition is the most. The heat transfer coefficients of dirt and scale are much lower than that of the metal tube, reducing the heat transfer efficiency of the heat exchange equipment, not only affecting the normal operation of the device, but also greatly increasing the energy consumption of the device.

[0004] In the initial stage of leakage, the circulating water system only shows a rapid increase in turbidity and COD, sometimes accompanied by peculiar smell and an increase in oil content. After the leakage lasts for a long time, the leaked medium will be consumed by microorganisms, and bacteria will multiply rapidly. The metabolites of bacteria and the sediment adhered to them form more harmful biological slime. This is because, where the biological slime adheres, it will become the site of under-deposit corrosion, eventually causing the equipment to corrode and perforate, resulting in the leakage of the process medium and polluting the circulating water of the system, causing great harm to the circulating water system. On the other hand, due to the limited discharge of industrial water, the polluted circulating water or the water that still cannot be discharged in time after sterilization treatment, and the leakage source cannot be treated in time, a vicious cycle is formed, posing a great threat to the long-term safe operation of the heat exchange equipment.

[0005] Therefore, how to deal with the leakage of the circulating water condenser has become an urgent problem to be solved. Summary of the Utility Model

[0006] A reaction gas cooling device provided by the utility model can separate the leaked medium from the circulating water, avoid shutdown caused by leakage, and maintain the quality of the circulating water.

[0007] The technical solution of the present utility model includes: a reaction gas cooling device, which includes a circulating water condenser. The circulating water condenser is connected with an intake pipe, an exhaust pipe, a circulating cold water pipe and a circulating hot water pipe. The circulating hot water pipe is connected with a liquid separation tank. The inlet of the liquid separation tank is connected with the circulating hot water pipe through a liquid inlet pipe. The liquid outlet of the liquid separation tank is connected with the circulating hot water pipe through a circulating water pipe. The gas outlet of the liquid separation tank is connected with a compressor through a reaction gas pipe. The connection between the liquid inlet pipe and the circulating hot water pipe is close to the circulating water condenser, and the connection between the circulating water pipe and the circulating hot water pipe is far from the circulating water condenser.

[0008] Preferably, the liquid separation tank is provided with a first pressure gauge, the compressor is provided with a second pressure gauge, the reaction gas pipe is provided with a pressure control valve. The pressure value of the first pressure gauge is greater than the pressure value of the second pressure gauge, and the pressure control valve is in an open state.

[0009] Preferably, the opening degree of the pressure control valve is positively correlated with the pressure value of the first pressure gauge.

[0010] Preferably, the liquid separation tank is provided with a liquid level gauge, the circulating water pipe is provided with a liquid return valve. When the liquid level value of the liquid level gauge is higher than the set value, the liquid return valve is in an open state.

[0011] Preferably, the liquid inlet pipe is provided with a liquid extraction valve. When the liquid return valve is in an open state, the opening degree of the liquid extraction valve decreases.

[0012] Preferably, the reaction gas pipe is connected to the top of the liquid separation tank, the circulating water pipe is connected to the upper part of the liquid separation tank, and the liquid inlet pipe is connected to the lower part of the liquid separation tank.

[0013] Preferably, the liquid inlet pipe is connected to the lower part on one side of the liquid separation tank, and the circulating water pipe is connected to the upper part on the other side of the liquid separation tank.

[0014] The beneficial effects of the present utility model are as follows: By designing the liquid separation tank, the circulating hot water leaking after cooling the reaction gas is introduced into the liquid separation tank. The circulating water and the light hydrocarbons leaked and mixed into it are separated in the liquid separation tank. The separated light hydrocarbons enter the compressor through the reaction gas pipe, and the separated circulating water enters the circulating hot water pipe through the circulating water pipe to participate in the cooling cycle again. After being separated from the light hydrocarbons, the quality of the circulating water can be guaranteed, and the problems of low heat exchange efficiency and pipeline corrosion and shutdown caused by the leakage of the circulating water condenser can also be avoided. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the attached drawings required for description in the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can be obtained based on these attached drawings.

[0016] Figure 1 It is a schematic diagram of the embodiment.

[0017] Among them:

[0018] 1. Circulating water condenser, 11. Intake pipeline, 12. Exhaust pipeline, 13. Circulating cold water pipe, 14. Circulating hot water pipe, 2. Liquid separation tank, 21. Liquid inlet pipeline, 22. Circulating water pipe, 23. Reaction gas pipe, 3. Liquid extraction valve, 4. Pressure control valve. Specific embodiments

[0019] In order to enable those in the technical field to better understand the solution of the present utility model, the following further elaborates on the present utility model in conjunction with the attached drawings and specific embodiments.

[0020] In this article, terms such as "upper, lower, left, right, inner, outer" are established based on the positional relationship shown in the attached drawings. Depending on the different attached drawings, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as an absolute limitation on the protection scope; moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components. In addition, in the embodiments of the present utility model, "above", "below", etc. include the number itself.

[0021] The reaction gas cooling device of this embodiment is mainly used to solve various problems caused by the leakage of the circulating water condenser during the cooling of the reaction gas generated in the MTO device. When the circulating water condenser leaks, if the leaking circulating water condenser is directly replaced, generally, a shutdown and maintenance method is required to replace the heat exchange tube bundle or heat exchanger, but the maintenance period is long, and the shutdown and maintenance affect the overall production capacity.

[0022] Aiming at the above defects, the reaction gas cooling device provided in this embodiment can still maintain the water quality of the circulating water without shutdown and maintenance even when the circulating water condenser leaks, avoiding problems such as low heat exchange efficiency, increased energy consumption, and corrosion of pipelines caused by water quality pollution due to leakage.

[0023] Refer to Figure 1, the reaction gas cooling device of this embodiment includes a circulating water condenser 1, which is connected with an intake pipe 11, an exhaust pipe 12, a circulating cold water pipe 13 and a circulating hot water pipe 14. During production, the high-temperature reaction gas generated enters the circulating water condenser 1 from the intake pipe 11. At the same time, the low-temperature circulating water for cooling and reducing the temperature of the high-temperature reaction gas enters the circulating water condenser 1 from the circulating cold water pipe 13. After the two exchange heat in the circulating water condenser 1, the cooled reaction gas is discharged from the exhaust pipe 12 and enters the subsequent process equipment. The high-temperature circulating water that has been heated after heat exchange is discharged from the circulating hot water pipe 14, and after being cooled, it enters the circulating water condenser 1 again as low-temperature circulating water from the circulating cold water pipe 13 to cool the reaction gas, and so on in a cycle.

[0024] The circulating hot water pipe 14 is connected with a liquid separation tank 2. In this embodiment, the liquid separation tank 2 can achieve gas-liquid separation. For the specific structure, reference can be made to the common gas-liquid separator structure, which will not be elaborated here. The inlet of the liquid separation tank 2 is connected with the circulating hot water pipe 14 through a liquid inlet pipe 21. The liquid outlet of the liquid separation tank 2 is connected with the circulating hot water pipe 14 through a circulating water pipe 22. The gas outlet of the liquid separation tank 2 is connected with a compressor (not shown in the figure) through a reaction gas pipe 23. Among them, the connection between the liquid inlet pipe 21 and the circulating hot water pipe 14 is close to the circulating water condenser 1, and the connection between the circulating water pipe 22 and the circulating hot water pipe 14 is far from the circulating water condenser 1.

[0025] By designing the liquid separation tank 2, when the circulating water condenser 1 leaks, the reaction gas (such as light hydrocarbons) will mix into the circulating water and be discharged from the circulating hot water pipe 14 along with the circulating water. At this time, at the place where the circulating hot water pipe 14 is close to the circulating water condenser 1, that is, at the circulating hot water outlet of the circulating water condenser 1, the liquid inlet pipe 21 is designed to be connected to it. The circulating water mixed with light hydrocarbons due to leakage is introduced into the liquid separation tank 2 through the liquid inlet pipe. After the gaseous light hydrocarbons and the liquid-phase circulating water are separated in the liquid separation tank 2, the gaseous light hydrocarbons are discharged into the compressor through the reaction gas pipe 23, and after being mixed with other reaction gases, they enter the subsequent process equipment. The liquid-phase mixed water is discharged into the circulating hot water pipe 14 through the circulating water pipe 22, mixed with the circulating water for cooling, and then enters the circulating water condenser 1 again in the form of low-temperature circulating water to participate in the cooling of the reaction gas. In this way, by using the liquid separation tank 2, even if the circulating water condenser 1 leaks during the cooling of the reaction gas, there is no need to stop the machine, and the separation of the circulating water and the leaked reaction gas can be achieved, the water quality of the circulating water can be maintained, and problems such as reduced heat exchange efficiency and pipeline corrosion caused by leakage can be avoided.

[0026] In this embodiment, a first pressure gauge (not shown in the figure) is provided in the liquid separation tank 2 to monitor the pressure inside the liquid separation tank 2, a second pressure gauge (not shown in the figure) is provided in the compressor to monitor the pressure of the compressor, and a pressure control valve 4 is provided in the reaction gas pipe 23. When the pressure value of the first pressure gauge is greater than the pressure value of the second pressure gauge, it can be considered that more reaction gas has accumulated and separated in the liquid separation tank 2 at this time. The pressure control valve 4 is controlled to be in an open state, and the reaction gas separated in the liquid separation tank 2 is discharged to the compressor. And because the air pressure in the liquid separation tank 2 is already higher than that of the compressor, driven by the self-pressure of the gas, it can flow from the liquid separation tank 2 to the compressor, saving the power consumed by external force drive and reducing the energy consumption of this cooling device.

[0027] Specifically, the opening degree of the pressure control valve 4 is designed to be positively correlated with the pressure value of the first pressure gauge, that is, when the pressure in the liquid separation tank 2 is greater, the opening degree of the pressure control valve 4 is increased, thereby increasing the discharged reaction gas volume and improving the exhaust efficiency.

[0028] In this embodiment, a liquid level gauge (not shown in the figure) is provided in the liquid separation tank 2, and a liquid return valve is provided in the circulating water pipe 22. When the liquid level value of the liquid level gauge is higher than the set value, specifically, this set value can be determined by oneself according to experience, and this embodiment does not make specific restrictions here. This set value can indicate that more liquid-phase circulating water has accumulated and separated in the liquid separation tank 2. At this time, the liquid return valve is controlled to be in an open state, and the circulating water that has been separated from light hydrocarbons and has no leakage and pollution is led to the circulating hot water pipe 14 through the circulating water pipe 22.

[0029] Specifically, a liquid extraction valve 3 is provided in the liquid inlet pipe 21. When the liquid return valve is in an open state, the opening degree of the liquid extraction valve 3 is reduced. In this way, when designing to discharge the separated circulating water outward, the amount of leaked circulating water entering the liquid separation tank 2 is reduced, avoiding the leaked circulating water that enters from being directly discharged from the circulating water pipe 22 without sufficient separation, and improving the quality maintenance of the circulating water quality.

[0030] Refer to Figure 1 , the reaction gas pipe 23 is connected to the top of the liquid separation tank 2, the circulating water pipe 22 is connected to the upper part of the liquid separation tank 2, and the liquid inlet pipe 21 is connected to the lower part of the liquid separation tank 2. In this way, using the characteristics that the gas phase is on the upper part and the liquid phase is on the lower part, and cooperating with setting the reaction gas pipe 23 at the top and the circulating water pipe 22 at the upper part, it is beneficial for the separated reaction gas and circulating water to be discharged. Specifically, the liquid inlet pipe 21 is connected to the lower part on one side of the liquid separation tank 2, and the circulating water pipe 22 is connected to the upper part on the other side of the liquid separation tank 2. In this way, the inlet of the leaked circulating water and the outlet of the separated circulating water are arranged on both sides of the tank body of the separation tank 2, which is beneficial to improving the gas-liquid separation effect.

[0031] In the case where the embodiments are not contradictory, at least part of the technical solutions in the embodiments can be recombined to form the substantial technical solution of the utility model. Of course, the embodiments can also be referenced or included in each other. In addition, it should be noted that the adaptive adjustments and modifications made by those skilled in the art when recombining the technical means recorded in the embodiments will also fall within the protection scope of the utility model.

[0032] The technical principle of the present invention is described above in combination with specific implementations, but it should be noted that the above descriptions are only for explaining the principle of the present invention and cannot be interpreted in any way as a specific limitation on the protection scope of the present invention. Based on the explanation here, technicians in this field can think of other specific implementations or equivalent replacements of the present invention without creative work, and they will fall within the protection scope of the present invention.

Claims

1. A reaction gas cooling device, comprising a circulating water condenser (1), the circulating water condenser (1) being connected with an intake pipe (11), an exhaust pipe (12), a circulating cold water pipe (13) and a circulating hot water pipe (14), characterized in that: The circulating hot water pipe (14) is connected to a liquid separation tank (2); The inlet of the liquid separation tank (2) is connected to the circulating hot water pipe (14) through a liquid inlet pipe (21), the liquid outlet of the liquid separation tank (2) is connected to the circulating hot water pipe (14) through a circulating water pipe (22), and the gas outlet of the liquid separation tank (2) is connected to a compressor through a reaction gas pipe (23); The connection between the liquid inlet pipe (21) and the circulating hot water pipe (14) is close to the circulating water condenser (1), and the connection between the circulating water pipe (22) and the circulating hot water pipe (14) is far from the circulating water condenser (1).

2. The reaction gas cooling device according to claim 1, wherein: The liquid separation tank (2) is provided with a first pressure gauge, the compressor is provided with a second pressure gauge, the reaction gas pipe (23) is provided with a pressure control valve (4), the pressure value of the first pressure gauge is greater than the pressure value of the second pressure gauge, and the pressure control valve (4) is in an open state.

3. The reaction gas cooling device according to claim 2, wherein: The opening degree of the pressure control valve (4) is positively correlated with the pressure value of the first pressure gauge.

4. The reaction gas cooling device according to claim 1, wherein: The liquid separation tank (2) is provided with a liquid level gauge, the circulating water pipe (22) is provided with a liquid return valve, the liquid level value of the liquid level gauge is higher than the set value, and the liquid return valve is in an open state.

5. The reaction gas cooling device according to claim 4, characterized in that: The liquid inlet pipe (21) is provided with a liquid extraction valve (3), and when the liquid return valve is in an open state, the opening degree of the liquid extraction valve (3) decreases.

6. The reaction gas cooling device according to claim 1, characterized in that: The reaction gas pipe (23) is connected to the top of the liquid separation tank (2), the circulating water pipe (22) is connected to the upper part of the liquid separation tank (2), and the liquid inlet pipe (21) is connected to the lower part of the liquid separation tank (2).

7. The reaction gas cooling device according to claim 6, characterized in that: The liquid inlet pipe (21) is connected to the lower part of one side of the liquid separation tank (2), and the circulating water pipe (22) is connected to the upper part of the other side of the liquid separation tank (2).

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