Tail gas treatment and emission device for polyether production

Abstract

The utility model relates to a tail gas treatment and discharge device for polyether production, which comprises a tail gas absorption tower and a water scrubber, and is technically characterized in that a plurality of tail gas absorption cavities are arranged in the tail gas absorption tower from top to bottom, and sewage output pipelines of the tail gas absorption cavities are intersected and connected with a water inlet pipeline at the top of a wastewater tank; a distributor is arranged in each tail gas absorption cavity, inlets of the distributors are connected with the tail gas condenser through door-shaped pipelines, a transition pipeline communicated with an inlet of the door-shaped pipeline on the upper portion is arranged on the side of the top of the tail gas absorption cavity on the lower portion, and the top of the tail gas absorption tower is connected with a gas-liquid separation tank through a first gas phase output pipeline. The top of the gas-liquid separation tank is connected with the tail gas absorption tank through a second gas phase output pipeline; the top of the tail gas absorption tank is connected with the water scrubber through a third gas phase output pipeline. The device is flexible and reliable to use, and the tail gas purification effect is remarkably improved through multiple treatment procedures.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment equipment for chemical product production, and particularly relates to an exhaust gas treatment and discharge device for polyether production. Background Technique

[0002] During the production process of polyether, tail gas is generated, and the tail gas contains harmful substances such as EO, PO, and other VOCs. Direct emission will cause harm to the environment. Therefore, tail gas treatment devices are often used for purification treatment.

[0003] For example, CN 219050881 U discloses an exhaust gas treatment and discharge device for polyether and surfactant production, which includes an alkali washing tower and an RCO tail gas treatment system connected to the alkali washing tower. It also includes a flame arrester and an activated carbon tank. The flame arrester is arranged on the side of the RCO tail gas treatment system away from the alkali washing tower, and the activated carbon tank is arranged on the other side of the flame arrester. In this device, the activated carbon tank is in a natural state, which is the standby state of the treatment facility, aiming to immediately treat the tail gas in case of emergencies. It is suitable for tail gas discharge conditions with uncertain discharge time and suddenness, so as to effectively purify the tail gas generated during the production of polyether and surfactant. However, there are still the following problems: it is not conducive to simultaneously treating tail gas from different directions and is not conducive to centralized treatment. Content of the Utility Model

[0004] The purpose of the utility model is to provide an exhaust gas treatment and discharge device for polyether production to solve the above problems, which has strong centralized treatment ability, is flexible and reliable in use, and significantly improves the tail gas purification effect through multiple treatment processes.

[0005] The technical solution of the utility model is as follows:

[0006] An exhaust gas treatment and discharge device for polyether production includes a tail gas absorption tower and a water washing tower. The technical key points are as follows: A plurality of tail gas absorption chambers are arranged in the tail gas absorption tower from top to bottom. A sewage output pipeline is arranged at the bottom of each tail gas absorption chamber. The ends of each sewage output pipeline converge and are connected to the top water inlet pipeline of the waste water tank. A distributor is arranged in each tail gas absorption chamber. The inlet of the distributor is connected to the gas phase outlet pipeline of the tail gas condenser through a U-shaped pipeline. The number of the tail gas condensers is equal to and corresponds to the number of the tail gas absorption chambers one by one. A transition pipeline is arranged on the side of the top of the lower tail gas absorption chamber and is communicated with the inlet of the U-shaped pipeline at the upper position. The top of the tail gas absorption tower is connected to the lower gas inlet of the gas-liquid separation tank through a first gas phase output pipeline. The top of the gas-liquid separation tank is connected to the lower gas inlet of the tail gas absorption tank through a second gas phase output pipeline. The top of the tail gas absorption tank is connected to the lower gas inlet of the water washing tower through a third gas phase output pipeline.

[0007] The above-mentioned tail gas treatment and emission device for polyether production. A packing layer is provided in the water washing tower. A demister is built inside the top of the water washing tower. A purified gas outlet is provided at the top of the water washing tower. A drain pipeline connected to the water washing circulation tank is provided at the bottom of the water washing tower. A first transfer pump is provided on the outlet pipeline of the water washing circulation tank. The outlet pipeline of the first transfer pump is inserted into the water washing tower above the packing layer and connected to a sprayer. The water washing circulation tank is provided with a first liquid level gauge.

[0008] The above-mentioned tail gas treatment and emission device for polyether production. Each of the tail gas absorption chambers is respectively provided with a second liquid level gauge, and the upper limit liquid level of the second liquid level gauge is lower than the high end of the corresponding U-shaped pipeline.

[0009] The above-mentioned tail gas treatment and emission device for polyether production. The waste water tank is provided with a third liquid level gauge. An overflow pipeline is further provided at the top of the waste water tank. A drain pipeline communicated with the overflow pipeline is provided at the bottom of the waste water tank. A second transfer pump is provided on the drain pipeline.

[0010] The above-mentioned tail gas treatment and emission device for polyether production. Each of the sewage output pipelines is respectively communicated with the industrial water supply pipeline for injecting water into each of the tail gas absorption chambers. Control valves are respectively provided on the sewage output pipeline, the industrial water supply pipeline and the top water inlet pipeline of the waste water tank.

[0011] The above-mentioned tail gas treatment and emission device for polyether production. Control valves are respectively provided on the gas phase outlet pipelines of each of the tail gas condensers.

[0012] The beneficial effects of the present utility model are:

[0013] 1. The tail gas from multiple directions and multiple workstations is absorbed by each of the tail gas condensers, and then sent into the corresponding tail gas absorption chambers in the tail gas absorption tower through each of the tail gas condensers. After being respectively absorbed and treated, it is collected through the U-shaped pipeline and the transition pipeline to the first gas phase output pipeline at the top of the tail gas absorption tower, and then enters the gas-liquid separation tank for gas-liquid separation. Then, the gas phase part successively enters the tail gas absorption tank and the water washing tower for multiple purification treatments, significantly improving the tail gas purification effect.

[0014] 2. The tail gas from different directions and different workstations is injected into the corresponding tail gas absorption chambers in the tail gas absorption tower for treatment as needed, and the treatment process is flexible and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] In the figure: 1. Tail gas condenser, 2. U-shaped pipeline, 3. Distributor, 4. Gas-liquid separation tank, 5. Second liquid level gauge, 6. Tail gas absorption tower, 7. Sewage output pipeline, 8. Water inlet pipeline, 9. Industrial water supply pipeline, 10. Waste water tank, 11. Third liquid level gauge, 12. Second delivery pump, 13. Overflow pipeline, 14. Transition pipeline, 15. Tail gas absorption tank, 16. Water washing tower, 17. Demister, 18. Packing layer, 19. Water washing circulation tank, 20. First liquid level gauge, 21. First delivery pump. Detailed implementation mode

[0017] The present utility model will be described in detail according to the attached drawings of the specification.

[0018] As Figure 1 shown, the tail gas treatment and emission device for polyether production includes a tail gas absorption tower 6 and a water washing tower 16.

[0019] Among them, there are 3 tail gas absorption chambers in the tail gas absorption tower 6 from top to bottom. A sewage output pipeline 7 is provided at the bottom of each tail gas absorption chamber. The ends of the sewage output pipelines 7 converge and are connected to the top water inlet pipeline 8 of the waste water tank 10. A distributor 3 is provided in each tail gas absorption chamber. The inlet of the distributor 3 is connected to the gas phase outlet pipeline of the tail gas condenser 1 through the U-shaped pipeline 2. The number of the tail gas condensers 1 is equal to and corresponds one by one to the number of the tail gas absorption chambers. A transition pipeline 14 communicating with the inlet of the U-shaped pipeline 2 above is provided on the side of the top of the lower tail gas absorption chamber. In this embodiment, each tail gas absorption chamber is respectively provided with a second liquid level gauge 5, and the upper limit liquid level of the second liquid level gauge 5 is lower than the high end of the corresponding U-shaped pipeline 2. The waste water tank 10 is provided with a third liquid level gauge 11. An overflow pipeline 13 is further provided at the top of the waste water tank 10. A drain pipeline communicating with the overflow pipeline 13 is provided at the bottom of the waste water tank 10, and a second delivery pump 12 is provided on the drain pipeline. Each sewage output pipeline 7 is respectively communicated with the industrial water supply pipeline 9 for injecting water into each tail gas absorption chamber. Control valves are respectively provided on the sewage output pipeline 7, the industrial water supply pipeline 9 and the top water inlet pipeline 8 of the waste water tank 10. Control valves are respectively provided on the gas phase outlet pipelines of each tail gas condenser 1.

[0020] The top of the tail gas absorption tower 6 is connected to the lower air inlet of the gas-liquid separation tank 4 through the first gas-phase output pipeline. The top of the gas-liquid separation tank 4 is connected to the lower air inlet of the tail gas absorption tank 15 through the second gas-phase output pipeline. The top of the tail gas absorption tank 15 is connected to the lower air inlet of the water washing tower 16 through the third gas-phase output pipeline. In this embodiment, a packing layer 18 is provided in the water washing tower 16. A demister 17 is built in at the top of the water washing tower 16. A purified gas outlet is provided at the top of the water washing tower 16. A drain pipeline connected to the water washing circulation tank 19 is provided at the bottom of the water washing tower 16. A first delivery pump 21 is provided on the outlet pipeline of the water washing circulation tank 19. The outlet pipeline of the first delivery pump 21 is inserted into the water washing tower above the packing layer 18 and is connected to a sprayer. The water washing circulation tank 19 is provided with a first liquid level gauge 20.

[0021] Working principle:

[0022] Industrial water is injected into each tail gas absorption chamber through the industrial water supply pipeline 9, and then the control valves on the respective sewage output pipelines 7, the industrial water supply pipeline 9, and the top water inlet pipeline 8 of the waste water tank are closed. When treating the tail gas, the multi-directional tail gas sequentially passes through the three tail gas condensers 1, the tail gas absorption chambers of the tail gas absorption tower 6, the gas-liquid separation tank 4, the tail gas absorption tank 15, and the water washing tower 16 for multiple purification treatments, and the purification effect is good.

[0023] The embodiments of the present invention have been described in detail above, but the above content is only the preferred embodiments of the present invention and cannot be considered as limiting the implementation scope of the present invention. All equal changes and improvements made within the scope of the present invention should still fall within the scope covered by this patent.

Claims

1. An exhaust gas treatment and emission device for polyether production, comprising an exhaust gas absorption tower and a water washing tower, characterized in that: The tail gas absorption tower is provided with a plurality of tail gas absorption chambers from top to bottom. Each tail gas absorption chamber is provided with a sewage output pipeline at the bottom. The ends of the sewage output pipelines converge and are connected to the top water inlet pipeline of the waste water tank. A distributor is provided in each tail gas absorption chamber. The inlet of the distributor is connected to the gas phase outlet pipeline of the tail gas condenser by a U-shaped pipeline. The number of the tail gas condensers is equal to and corresponds one by one to the number of the tail gas absorption chambers. A transition pipeline communicating with the inlet of the U-shaped pipeline above is provided on the side of the top of the lower tail gas absorption chamber. The top of the tail gas absorption tower is connected to the lower gas inlet of the gas-liquid separation tank by a first gas phase output pipeline. The top of the gas-liquid separation tank is connected to the lower gas inlet of the tail gas absorption tank by a second gas phase output pipeline. The top of the tail gas absorption tank is connected to the lower gas inlet of the water washing tower by a third gas phase output pipeline.

2. The tail gas treatment and emission device for polyether production according to claim 1, characterized in that: A packing layer is provided in the water washing tower. A demister is built in the top of the water washing tower. A purified gas outlet is provided at the top of the water washing tower. A drainage pipeline connected to the water washing circulation tank is provided at the bottom of the water washing tower. A first transfer pump is provided on the outlet pipeline of the water washing circulation tank. The outlet pipeline of the first transfer pump is inserted into the water washing tower above the packing layer and is connected to a sprayer. The water washing circulation tank is provided with a first liquid level gauge.

3. The tail gas treatment and emission device for polyether production according to claim 1, characterized in that: Each of the tail gas absorption chambers is respectively provided with a second liquid level gauge, and the upper limit liquid level of the second liquid level gauge is lower than the high end of the corresponding U-shaped pipeline.

4. The tail gas treatment and emission device for polyether production according to claim 1, characterized in that: The waste water tank is provided with a third liquid level gauge. An overflow pipeline is further provided at the top of the waste water tank. A drainage pipeline communicating with the overflow pipeline is provided at the bottom of the waste water tank. A second transfer pump is provided on the drainage pipeline.

5. The tail gas treatment and emission device for polyether production according to claim 1, characterized in that: Each of the sewage output pipelines is respectively communicated with an industrial water supply pipeline for injecting water into each tail gas absorption chamber. Control valves are respectively provided on the sewage output pipeline, the industrial water supply pipeline and the top water inlet pipeline of the waste water tank.

6. The tail gas treatment and emission device for polyether production according to claim 1, characterized in that: Control valves are respectively provided on the gas phase outlet pipelines of each of the tail gas condensers.

Images