Ethylene carbonate secondary steam recovery device

Abstract

The utility model relates to an ethylene carbonate secondary steam recovery device. According to the technical scheme, a reboiler is arranged at the bottom of an ethylene carbonate rectifying tower, an inlet of the reboiler is connected with a primary steam pipeline, an outlet of the reboiler is connected with a steam discharge pipeline, the tail end of the steam discharge pipeline is connected to a secondary steam buffer tank, and the bottom of the secondary steam buffer tank is connected with a condensed hot water storage tank through a pipeline. A liquid level meter is installed in an inner cavity of the condensed hot water storage tank, the lower end of the condensed hot water storage tank is connected to the multi-stage hot water heat exchanger through a pipeline and a condensed water conveying pump, and the output end of the multi-stage hot water heat exchanger is connected to the top of the condensed hot water storage tank through a pipeline. The device has the beneficial effects that secondary steam enters the secondary steam buffer tank, and condensed hot water enters the condensed hot water storage tank; and then the steam condensate is pumped into the multi-stage hot water heat exchanger for heat exchange, so that the steam condensate is recycled, a large amount of steam heat energy is recovered, the energy consumption of enterprise production is reduced, and the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to an auxiliary device for preparing ethylene carbonate, in particular to a secondary steam recovery device for ethylene carbonate. Background Art

[0002] Ethylene carbonate is an organic chemical raw material with excellent performance. In recent years, high-purity ethylene carbonate has been mainly used in the electrolyte of lithium-ion batteries. With the rapid development of lithium-ion batteries, the amount of ethylene carbonate solvent is increasing, and the development prospects are broad. At present, the commonly used preparation method is: ethylene oxide and carbon dioxide addition reaction to prepare ethylene carbonate. In the production process of ethylene carbonate equipment, a large amount of steam is required in the distillation production and production insulation process. The recovery rate of steam on site is low, which wastes a lot of heat energy and reduces economic benefits. Utility Model Content

[0003] The purpose of the utility model is to provide a secondary steam recovery device for ethylene carbonate in view of the above-mentioned defects in the prior art, so as to recycle and recycle the steam in the distillation production and production insulation process, recover a large amount of steam heat energy, reduce the energy consumption of enterprise production, and improve economic benefits.

[0004] The utility model discloses a ethylene carbonate secondary steam recovery device, and its technical scheme is as follows: it comprises an ethylene carbonate distillation tower (T001), a secondary steam buffer tank (V103), a condensation hot water storage tank (V104), a multi-stage hot water heat exchanger (E151) and a condensation water delivery pump, wherein a reboiler (13) is provided at the bottom of the ethylene carbonate distillation tower (T001), the inlet of the reboiler (13) is connected to a primary steam pipeline, the outlet of the reboiler (13) is connected to a steam exhaust pipeline (14), and the steam exhaust pipeline The end of the line (14) is connected to the secondary steam buffer tank (V103), the bottom of the secondary steam buffer tank (V103) is connected to the condensation hot water storage tank (V104) through a pipeline, the inner cavity of the condensation hot water storage tank (V104) is installed with a liquid level gauge (4), the lower end of the condensation hot water storage tank (V104) is connected to the multi-stage hot water heat exchanger (E151) through a pipeline and a condensate delivery pump, and the output end of the multi-stage hot water heat exchanger (E151) is connected to the top of the condensation hot water storage tank (V104) through a pipeline.

[0005] Preferably, the condensate delivery pump comprises a first condensate delivery pump (P106A), a second condensate delivery pump (P106B), and a third condensate delivery pump (P106C), wherein a first condensate delivery pump controller (1) is installed on one side of the first condensate delivery pump (P106A), a second condensate delivery pump controller (2) is installed on one side of the second condensate delivery pump (P106B), and a third condensate delivery pump controller (3) is installed on one side of the third condensate delivery pump (P106C).

[0006] Preferably, the first condensate delivery pump controller (1) is connected to the liquid level gauge (4) in the condensate hot water storage tank (V104) via a signal line (5), the second condensate delivery pump controller (2) is connected to the liquid level gauge (4) in the condensate hot water storage tank (V104) via a signal line (5), and the third condensate delivery pump controller (3) is connected to the liquid level gauge (4) in the condensate hot water storage tank (V104) via a signal line (5).

[0007] Preferably, the above-mentioned multi-stage hot water heat exchanger (E151) adopts three-stage heat exchange, and a first control valve (6), a second control valve (7) and a third control valve (8) are respectively installed on the corresponding connecting pipelines.

[0008] Preferably, a secondary steam circulation control valve (11) is installed on the steam discharge pipeline (14) connected to the outlet of the reboiler (13), and a tee is installed on the steam discharge pipeline and connected to the secondary steam discharge control valve (12).

[0009] Preferably, a hot water recovery pipeline (15) is connected to the steam discharge pipeline (14) close to the condensation hot water storage tank (V104), and the hot water recovery pipeline (15) is connected to an external hot water recovery storage tank (V105).

[0010] Preferably, a hot water pipe control valve (9) is installed on the steam discharge pipeline (14) close to the condensation hot water storage tank (V104), and a recovery pipe hot water control valve (10) is installed on the recovery hot water pipeline (15).

[0011] The beneficial effects of the utility model are as follows: after the primary steam passes through the reboiler of the distillation tower, the steam is decompressed and becomes secondary steam, the secondary steam enters the secondary steam buffer tank through the steam discharge pipeline, and the hot water enters the condensation hot water storage tank after condensation; the condensation hot water is then pumped into the multi-stage hot water heat exchanger for heat exchange through the condensation water delivery pump, thereby realizing the recycling of steam condensate, reusing and recycling the steam in the distillation production and production insulation process, recycling a large amount of steam thermal energy, reducing the energy consumption of enterprise production, and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a structural schematic diagram of embodiment 1 of the utility model;

[0013] Figure 2 It is a structural schematic diagram of embodiment 2 of the utility model;

[0014] In the above figure: ethylene carbonate distillation tower T001, secondary steam buffer tank V103, condensation hot water storage tank V104, external recovery hot water storage tank V105, first condensate delivery pump P106A, second condensate delivery pump P106B, third condensate delivery pump P106C, multi-stage hot water heat exchanger E151, first condensate delivery pump controller 1, second condensate delivery pump controller 2, third condensate delivery pump controller 3, liquid level meter 4, signal line 5, first control valve 6, second control valve 7, third control valve 8, hot water pipe control valve 9, recovery pipe hot water control valve 10, secondary steam circulation control valve 11, secondary steam external discharge control valve 12, reboiler 13, steam discharge pipeline 14, recovery hot water pipeline 15. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0016] Example 1, reference Figure 1 The utility model mentions a ethylene carbonate secondary steam recovery device, comprising an ethylene carbonate distillation tower T001, a secondary steam buffer tank V103, a condensation hot water storage tank V104, a multi-stage hot water heat exchanger E151 and a condensation water delivery pump. A reboiler 13 is provided at the bottom of the ethylene carbonate distillation tower T001, the inlet of the reboiler 13 is connected to a primary steam pipeline, the outlet of the reboiler 13 is connected to a steam exhaust pipeline 14, the end of the steam exhaust pipeline 14 is connected to the secondary steam buffer tank V103, the bottom of the secondary steam buffer tank V103 is connected to the condensation hot water storage tank V104 through a pipeline, a liquid level gauge 4 is installed in the inner cavity of the condensation hot water storage tank V104, the lower end of the condensation hot water storage tank V104 is connected to the multi-stage hot water heat exchanger E151 through a pipeline and a condensation water delivery pump, and the output end of the multi-stage hot water heat exchanger E151 is connected to the top of the condensation hot water storage tank V104 through a pipeline.

[0017] Among them, the above-mentioned condensate delivery pump includes a first condensate delivery pump P106A, a second condensate delivery pump P106B, and a third condensate delivery pump P106C. The first condensate delivery pump controller 1 is installed on one side of the first condensate delivery pump P106A, the second condensate delivery pump controller 2 is installed on one side of the second condensate delivery pump P106B, and the third condensate delivery pump controller 3 is installed on one side of the third condensate delivery pump P106C.

[0018] The above-mentioned multi-stage hot water heat exchanger E151 adopts three-stage heat exchange, and the first control valve 6, the second control valve 7 and the third control valve 8 are respectively installed on the corresponding connecting pipelines.

[0019] A secondary steam circulation control valve 11 is installed on the steam discharge pipeline 14 connected to the outlet of the above-mentioned reboiler 13, and a tee is installed on the steam discharge pipeline and connected to a secondary steam discharge control valve 12.

[0020] A hot water recovery pipeline 15 is connected to the steam discharge pipeline 14 near the condensation hot water storage tank V104, and the hot water recovery pipeline 15 is connected to the external hot water recovery storage tank V105.

[0021] A hot water pipe control valve 9 is installed on the steam discharge pipeline 14 close to the condensation hot water storage tank V104, and a recovery pipe hot water control valve 10 is installed on the recovery hot water pipeline 15.

[0022] When the utility model is used, after the primary steam passes through the reboiler of the distillation tower, the steam is decompressed to become secondary steam, and the secondary steam enters the secondary steam buffer tank V103 through the steam discharge pipeline 14, and the hot water enters the condensed hot water storage tank V104 after condensation; and then the condensed hot water is pumped into the multi-stage hot water heat exchanger E151 for heat exchange through the condensate delivery pump, thereby realizing the recycling of steam condensate, and reusing and recycling the steam in the distillation production and production insulation process, recycling a large amount of steam thermal energy, reducing the energy consumption of enterprise production, and improving economic benefits.

[0023] In addition, the hot water recovered from the production insulation process can be sent to the external hot water storage tank V105, and then recycled through the hot water pipeline 15. Moreover, the secondary steam can be opened according to the needs of the workshop. The secondary steam discharge control valve 12 is opened, and the secondary steam circulation control valve 11 is closed to introduce the secondary steam to other places in the workshop where it is needed, which also makes full use of the thermal energy of the secondary steam.

[0024] The advantages of the utility model are: first, energy saving and emission reduction: by recycling the secondary steam, steam condensate, etc. of the distillation tower, the energy consumption of the device can be reduced, and carbon emissions can be indirectly reduced; second, production costs can be reduced: after recycling the steam of the device, the production cost of the device can be reduced, and the competitiveness of the device products can be improved.

[0025] Example 2, reference Figure 2The utility model mentions a ethylene carbonate secondary steam recovery device, comprising an ethylene carbonate distillation tower T001, a secondary steam buffer tank V103, a condensation hot water storage tank V104, a multi-stage hot water heat exchanger E151 and a condensation water delivery pump. A reboiler 13 is provided at the bottom of the ethylene carbonate distillation tower T001, the inlet of the reboiler 13 is connected to a primary steam pipeline, the outlet of the reboiler 13 is connected to a steam exhaust pipeline 14, the end of the steam exhaust pipeline 14 is connected to the secondary steam buffer tank V103, the bottom of the secondary steam buffer tank V103 is connected to the condensation hot water storage tank V104 through a pipeline, a liquid level gauge 4 is installed in the inner cavity of the condensation hot water storage tank V104, the lower end of the condensation hot water storage tank V104 is connected to the multi-stage hot water heat exchanger E151 through a pipeline and a condensation water delivery pump, and the output end of the multi-stage hot water heat exchanger E151 is connected to the top of the condensation hot water storage tank V104 through a pipeline.

[0026] The difference from Example 1 is:

[0027] The first condensate delivery pump controller 1 mentioned in this embodiment is connected to the liquid level gauge 4 in the condensation hot water storage tank V104 through a signal line 5, the second condensate delivery pump controller 2 is connected to the liquid level gauge 4 in the condensation hot water storage tank V104 through a signal line 5, and the third condensate delivery pump controller 3 is connected to the liquid level gauge 4 in the condensation hot water storage tank V104 through a signal line 5. The water level of the condensation hot water storage tank V104 can be judged according to the situation of the liquid level gauge 4, and then the first condensate delivery pump controller 1, the second condensate delivery pump controller 2 or the third condensate delivery pump controller 3 can be controlled to be turned on or off, thereby realizing flexible control of the liquid level.

[0028] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent transformation based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. An ethylene carbonate secondary vapor recovery device, characterized in that: Including carbonic acid An ethylene carbonate distillation tower (T001), a secondary steam buffer tank (V103), a condensation hot water storage tank (V104), a multi-stage hot water heat exchanger (E151) and a condensation water delivery pump. The bottom of the ethylene carbonate distillation tower (T001) is provided with a reboiler (13), the inlet of the reboiler (13) is connected to a primary steam pipeline, the outlet of the reboiler (13) is connected to a steam exhaust pipeline (14), and the end of the steam exhaust pipeline (14) is connected to the secondary steam buffer tank. Tank (V103), the bottom of the secondary steam buffer tank (V103) is connected to the condensation hot water storage tank (V104) through a pipeline, the inner cavity of the condensation hot water storage tank (V104) is installed with a liquid level gauge (4), the lower end of the condensation hot water storage tank (V104) is connected to the multi-stage hot water heat exchanger (E151) through a pipeline and a condensate delivery pump, and the output end of the multi-stage hot water heat exchanger (E151) is connected to the top of the condensation hot water storage tank (V104) through a pipeline.

2. The ethylene carbonate secondary vapor recovery device according to claim 1, characterized in that: The condensate delivery pump comprises a first condensate delivery pump (P106A), a second condensate delivery pump (P106B), and a third condensate delivery pump (P106C). A first condensate delivery pump controller (1) is installed on one side of the first condensate delivery pump (P106A), a second condensate delivery pump controller (2) is installed on one side of the second condensate delivery pump (P106B), and a third condensate delivery pump controller (3) is installed on one side of the third condensate delivery pump (P106C).

3. The ethylene carbonate secondary steam recovery device according to claim 2, characterized in that: The first condensate delivery pump controller (1) is connected to the liquid level gauge (4) in the condensate hot water storage tank (V104) via a signal line (5), the second condensate delivery pump controller (2) is connected to the liquid level gauge (4) in the condensate hot water storage tank (V104) via a signal line (5), and the third condensate delivery pump controller (3) is connected to the liquid level gauge (4) in the condensate hot water storage tank (V104) via a signal line (5).

4. The ethylene carbonate secondary vapor recovery device according to claim 3, characterized in that: The multi-stage hot water heat exchanger (E151) adopts three-stage heat exchange, and a first control valve (6), a second control valve (7) and a third control valve (8) are respectively installed on the corresponding connecting pipelines.

5. The ethylene carbonate secondary vapor recovery device according to claim 4, characterized in that: A secondary steam circulation control valve (11) is installed on the steam discharge pipeline (14) connected to the outlet of the reboiler (13), and a tee is installed on the steam discharge pipeline and connected to the secondary steam discharge control valve (12).

6. The ethylene carbonate secondary steam recovery device according to claim 5, characterized in that: A hot water recovery pipeline (15) is connected to a steam discharge pipeline (14) close to the condensation hot water storage tank (V104), and the hot water recovery pipeline (15) is connected to an external hot water recovery storage tank (V105).

7. The ethylene carbonate secondary vapor recovery device according to claim 6, characterized in that: A hot water pipe control valve (9) is installed on the steam discharge pipeline (14) close to the condensation hot water storage tank (V104), and a recovery pipe hot water control valve (10) is installed on the recovery hot water pipeline (15).

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