Vacuumizing device for epichlorohydrin production

Abstract

The utility model relates to the technical field of epichlorohydrin production, in particular to a vacuumizing device for epichlorohydrin production, which comprises a gas-water separation tank and a vacuum pump unit, the gas-water separation tank is provided with a tank body water inlet and a tank body water outlet, the tank body water inlet is communicated with a vacuumizing pipe, and the tank body water outlet is communicated with a circulating water supply pipe; the vacuum pump unit comprises a plurality of water-ring vacuum pumps which are arranged in parallel; a pump body extraction opening of each water-ring vacuum pump is communicated with a vacuum interface of the heating tower for producing the epichlorohydrin; according to the utility model, the water outlets of the plurality of water ring vacuum pumps are communicated with the water filtering branch pipes through the same circulating water discharging pipe, and the filtering device is arranged, so that the occupied area of equipment is reduced, and the problem of blockage caused by polymer accumulation is solved; due to the design of a liquid seal structure and a vacuum liquid seal pipe of the gas-water separation tank, the problem of air suck-back when a vacuum pump breaks down is solved, and the risk of fire in the tower is reduced.

Description

Technical Field

[0001] This utility model relates to the field of epichlorohydrin production technology, and in particular to a vacuum device for epichlorohydrin production. Background Technology

[0002] In the production of epichlorohydrin, multiple heating towers need to be evacuated. Because epichlorohydrin is flammable and has a low flash point, the heating towers must be isolated from oxygen. Traditional vacuum systems control the negative pressure inside the towers using one-way valves; however, if these one-way valves malfunction, air may be drawn back into the tower, posing a fire risk and significant safety hazard.

[0003] Furthermore, in traditional systems, each water ring vacuum pump is equipped with an independent gas-liquid separator and level gauge. When multiple vacuum pumps operate simultaneously, these devices occupy a significant amount of space, resulting in resource waste. If a shared gas-liquid separator is used, the polymer generated by a single pump drawing negative pressure is prone to accumulate in the shared separator, increasing the risk of blockage in the vacuum system. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a vacuum pumping device for epichlorohydrin production, which aims to improve space utilization, reduce the risk of blockage in the vacuum system, and solve the problem of fire inside the tower caused by damage to the one-way valve, in order to address the shortcomings of the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A vacuum pumping device for epichlorohydrin production, characterized by:

[0007] It includes a gas-water separator and a vacuum pump unit. The gas-water separator is equipped with a tank inlet and a tank outlet. The tank inlet is connected to a vacuum pipe, and the tank outlet is connected to a circulating water supply pipe.

[0008] The vacuum pump unit includes multiple water ring vacuum pumps connected in parallel. Each water ring vacuum pump is equipped with a pump body suction port, a pump body exhaust port, a pump body water inlet, and a pump body drain port. The pump body suction port of each water ring vacuum pump is connected to the vacuum interface of the heating tower used for epichlorohydrin production. The pump body exhaust port of each water ring vacuum pump is connected to the vacuum pipe. The pump body water inlet of each water ring vacuum pump is connected to the circulating water supply pipe.

[0009] The gas-liquid separator is also equipped with a tank water inlet and a tank water filter. The tank water inlet is connected to an external water supply system, and the tank water filter is connected to the circulating water supply pipe through a filter branch pipe.

[0010] Each water ring vacuum pump's pump body drain port is connected to the filter branch pipe via the same circulating drain pipe, and a filter device is installed on the filter branch pipe to remove impurities from the circulating water.

[0011] The technical problem to be solved by this utility model can be further achieved through the following steps: the filtration device includes a first filter and a second filter arranged in series along the liquid flow direction on the water filter branch pipe, and a flow regulating valve and a circulating water supply pump are also provided on the water filter branch pipe between the first filter and the second filter.

[0012] The technical problem to be solved by this utility model can be further achieved through the following steps: a cooling device is also provided on the circulating water supply pipe, the cooling device includes two circulating coolers connected in parallel, and each circulating cooler is connected to an external circulating cooling water system.

[0013] The technical problem to be solved by this utility model can be further achieved through the following steps: the tank inlet and tank water supply outlet are located at the upper part of the gas-water separator, and the tank outlet and tank filter outlet are located at the bottom of the gas-water separator.

[0014] The technical problem to be solved by this utility model can be further achieved through the following steps: the top of the gas-water separator is also provided with a tank liquid seal, the tank liquid seal is connected to a vacuum liquid seal pipe, the vacuum liquid seal pipe is connected to the vacuum interface of each epichlorohydrin production heating tower, and the pipe opening of the vacuum liquid seal pipe is located below the liquid level of the gas-water separator, so as to prevent air backflow through liquid seal when the vacuum pump fails.

[0015] The technical problem to be solved by this utility model can be further achieved through the following steps: the circulating water supply pipe is connected to the external water supply system, and a flow meter and a shut-off valve are also installed on the path connecting the circulating water supply pipe to each water ring vacuum pump.

[0016] The technical problem to be solved by this utility model can be further achieved through the following steps: the top of the gas-water separator is provided with a tail gas outlet, the bottom of the gas-water separator is provided with a wastewater outlet, the tail gas outlet is connected to an external tail gas treatment system, the wastewater outlet is connected to an external wastewater treatment system through a wastewater discharge pipe, and a wastewater drainage pump is installed on the wastewater discharge pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: By connecting the drain ports of multiple water ring vacuum pumps to the filter branch pipe through the same circulating drain pipe and installing a filter device, not only is the equipment floor space reduced and the space is made more efficient, but the blockage problem caused by polymer accumulation in the shared gas-liquid separator is also effectively solved. At the same time, the liquid seal structure of the gas-liquid separator and the design of the vacuum liquid seal pipe solve the problem of air backflow caused by vacuum problems in vacuum equipment involving flammable liquids, significantly reducing the risk of fire inside the tower. The overall device has a reasonable structure, is safe and reliable in operation, and is suitable for the vacuuming requirements in epichlorohydrin production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] In the diagram: 1-Gas-water separator; 2-Tank inlet; 3-Tank outlet; 4-Vacuum pipe; 5-Circulating water supply pipe; 6-Water ring vacuum pump; 7-Pump exhaust port; 8-Pump exhaust port; 9-Pump inlet; 10-Pump drain port; 11-Tank water inlet; 12-Tank filter port; 13-Filter branch pipe; 14-Circulating drain pipe; 15-First filter; 16-Second filter; 17-Flow regulating valve; 18-Circulating water supply pump; 19-Circulating cooler; 20-Vacuum liquid seal pipe; 21-Flow meter; 22-Stop valve; 23-Tail gas outlet; 24-Wastewater outlet; 25-Wastewater drainage pump. Detailed Implementation

[0020] The specific technical solutions of this utility model are further described below to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0022] Please refer to Figure 1 A vacuuming device for epichlorohydrin production includes a gas-liquid separator 1 and a vacuum pump unit. The gas-liquid separator 1 is provided with a tank inlet 2 and a tank outlet 3. The tank inlet 2 is connected to a vacuuming pipe 4, and the tank outlet 3 is connected to a circulating water supply pipe 5.

[0023] The vacuum pump unit includes multiple water ring vacuum pumps 6 connected in parallel. Each water ring vacuum pump 6 is equipped with a pump body suction port 7, a pump body exhaust port 8, a pump body water inlet 9, and a pump body drain port 10. The pump body suction port 7 of each water ring vacuum pump 6 is connected to the vacuum interface of the heating tower used for epichlorohydrin production. The pump body exhaust port 8 of each water ring vacuum pump 6 is connected to the vacuum pipe 4. The pump body water inlet 9 of each water ring vacuum pump 6 is connected to the circulating water supply pipe 5.

[0024] In this embodiment, the heating tower for epichlorohydrin production specifically includes a primary distillation tower, a rectification tower, a cyclization A tower, and a cyclization B tower. A total of seven water ring vacuum pumps 6 are provided, two of which are connected to the primary distillation tower, two of which are connected to the rectification tower, and the remaining three are connected to the cyclization A tower and the cyclization B tower.

[0025] The gas-liquid separator 1 is also provided with a tank water inlet 11 and a tank water filter 12. The tank water inlet 11 is connected to an external water supply system to replenish circulating water in the tank. The tank water filter 12 is connected to the circulating water supply pipe 5 through a filter branch pipe 13. Valves are installed on both the circulating water supply pipe 5 and the filter branch pipe 13 to control the opening and closing of the above-mentioned pipes when needed.

[0026] Each water ring vacuum pump 6 has its pump body drain port 10 connected to the filter branch pipe 13 via the same circulating drain pipe 14. A filter device for removing impurities from the circulating water is installed on the filter branch pipe 13. With this configuration, the internal circulating water of the water ring vacuum pump 6 flows out through the pump body drain port 10 and into the filter branch pipe via the circulating drain pipe 14. After being filtered by the filter device, it re-enters the circulating water supply pipe 5.

[0027] In the above structure, the filtration device includes a first filter 15 and a second filter 16 arranged in series along the liquid flow direction on the water filter branch pipe 13. A flow regulating valve 17 and a circulating water pump 18 are also provided on the water filter branch pipe 13 between the first filter 15 and the second filter 16. The two-stage filtration structure effectively enhances the filtration effect. The circulating water pump 18 provides power for the circulating water, and the flow regulating valve 17 controls the overall flow rate.

[0028] Since the pumping performance of the water ring vacuum pump 6 is greatly affected by the working water temperature, when the water pressure reaches the saturation pressure corresponding to the temperature, the water will vaporize, and the suction chamber of the water ring vacuum pump 6 will be filled with vaporized water vapor, losing its pumping capacity. Therefore, a cooling device is also provided on the circulating water supply pipe 5. The cooling device includes two circulating coolers 19 connected in parallel. Each circulating cooler 19 is connected to an external circulating cooling water system to maintain the circulating water temperature between 15° and 20°.

[0029] To further optimize the layout, the tank inlet 2 and tank water supply inlet 11 are located at the upper part of the gas-water separator 1, and the tank outlet 3 and tank filter outlet 12 are located at the bottom of the gas-water separator 1.

[0030] To prevent air backflow and subsequent fire inside the tower in case of vacuum pump failure, the top of the gas-liquid separator 1 is equipped with a liquid seal port (not directly shown in the figure, but can be understood as related to the vacuum liquid seal pipe based on the description). The liquid seal port is connected to a vacuum liquid seal pipe 20, which is connected to the vacuum interface of each epichlorohydrin production heating tower. The opening of the vacuum liquid seal pipe 20 is located below the liquid level of the gas-liquid separator 1 to prevent air backflow through the liquid seal in case of vacuum pump failure.

[0031] To facilitate water replenishment for the water ring vacuum pump 6, the circulating water supply pipe 5 is connected to an external water supply system. A flow meter 21 and a shut-off valve 22 are also installed on the path connecting the circulating water supply pipe 5 to each water ring vacuum pump 6.

[0032] The top of the gas-water separator 1 is also provided with a tail gas outlet 23, and the bottom of the gas-water separator 1 is also provided with a wastewater outlet 24. The tail gas outlet 23 is connected to an external tail gas treatment system, and the wastewater outlet 24 is connected to an external wastewater treatment system through a wastewater discharge pipe. A wastewater drainage pump 25 is also installed on the wastewater discharge pipe.

[0033] Working Principle: This utility model discloses a vacuuming device for epichlorohydrin production. In operation, circulating water is first injected into the gas-liquid separator 1 through an external water supply system, ensuring the water level covers the opening of the vacuum liquid seal pipe 20 to form a liquid seal and prevent air backflow. After starting the water ring vacuum pump 6, the circulating water flows out from the outlet 3 of the gas-liquid separator 1, enters the pump inlet 9 of each water ring vacuum pump 6 via the circulating water supply pipe 5, forming a water ring and initiating vacuuming operations. During vacuuming, gas from the heating tower is drawn into the water ring vacuum pump 6 through the pump body exhaust port 7, and then discharged into the gas-liquid separator 1 through the pump body exhaust port 8 and the vacuuming pipe 4. After mixing with the circulating water, some gas dissolves in the water, while undissolved gas is discharged from the tail gas outlet 23 and enters the external tail gas treatment system. After gas-liquid separation within the gas-liquid separator 1, the circulating water flows out from the tank body filter port 12 and enters the filtration device via the filter branch pipe 13. The filtered circulating water re-enters the circulating water supply pipe 5 through the circulating water supply pump 18 and flow regulating valve 17, returning to the water ring vacuum pump 6 to form a closed-loop circulation. The cooling device controls the circulating water temperature between 15°C and 20°C through the circulating cooler 19 to ensure the stable pumping performance of the water ring vacuum pump 6. After the circulating water has been used for a period of time, the wastewater is discharged into the external wastewater treatment system through the wastewater discharge port 24 and the wastewater discharge pipe to ensure that the water quality meets the requirements.

[0034] This invention effectively solves the problems of low space utilization, easy system blockage, and air backflow leading to fire in traditional vacuum devices by optimizing the circulating water system, adding a filtration device and a cooling device, and designing a liquid seal structure, thus significantly improving the safety and efficiency of epichlorohydrin production.

[0035] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A vacuum pumping device for epichlorohydrin production, characterized in that: It includes a gas-water separator and a vacuum pump unit. The gas-water separator is equipped with a tank inlet and a tank outlet. The tank inlet is connected to a vacuum pipe, and the tank outlet is connected to a circulating water supply pipe. The vacuum pump unit includes multiple water ring vacuum pumps connected in parallel. Each water ring vacuum pump is equipped with a pump body suction port, a pump body exhaust port, a pump body water inlet, and a pump body drain port. The pump body suction port of each water ring vacuum pump is connected to the vacuum interface of the heating tower used for epichlorohydrin production. The pump body exhaust port of each water ring vacuum pump is connected to the vacuum pipe. The pump body water inlet of each water ring vacuum pump is connected to the circulating water supply pipe. The gas-liquid separator is also equipped with a tank water inlet and a tank water filter. The tank water inlet is connected to an external water supply system, and the tank water filter is connected to the circulating water supply pipe through a filter branch pipe. Each water ring vacuum pump's pump body drain port is connected to the filter branch pipe via the same circulating drain pipe, and a filter device is installed on the filter branch pipe to remove impurities from the circulating water.

2. The vacuuming device for the production of epichlorohydrin according to claim 1, characterized in that: The filtration device includes a first filter and a second filter connected in series along the liquid flow direction on a water filter branch pipe. A flow regulating valve and a circulating water supply pump are also installed on the water filter branch pipe between the first filter and the second filter.

3. The vacuuming device for the production of epichlorohydrin according to claim 1, characterized in that: The circulating water supply pipe is also equipped with a cooling device, which includes two circulating coolers connected in parallel, each of which is connected to an external circulating cooling water system.

4. The vacuuming device for the production of epichlorohydrin according to claim 1, characterized in that: The tank inlet and tank makeup inlet are located at the top of the gas-liquid separator, and the tank outlet and tank filter outlet are located at the bottom of the gas-liquid separator.

5. The vacuuming device for the production of epichlorohydrin according to claim 4, characterized in that: The top of the gas-liquid separator is also provided with a liquid seal port, which is connected to a vacuum liquid seal pipe. The vacuum liquid seal pipe is connected to the vacuum interface of each epichlorohydrin production heating tower, and the pipe opening of the vacuum liquid seal pipe is located below the liquid level of the gas-liquid separator to prevent air backflow through the liquid seal in case of vacuum pump failure.

6. The vacuuming device for the production of epichlorohydrin according to claim 1, characterized in that: The circulating water supply pipe is connected to the external water supply system, and flow meters and shut-off valves are also installed on the path connecting the circulating water supply pipe to each water ring vacuum pump.

7. The vacuum pumping device for epichlorohydrin production according to claim 1, characterized in that: The gas-water separator is equipped with a tail gas outlet at the top and a wastewater outlet at the bottom. The tail gas outlet is connected to an external tail gas treatment system, and the wastewater outlet is connected to an external wastewater treatment system through a wastewater discharge pipe. A wastewater drainage pump is also installed on the wastewater discharge pipe.

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