Chloroethylene converter exhaust heat recovery system

Abstract

The utility model discloses a vinyl chloride converter exhaust heat recovery system, it includes hot water tower, condenser, production water inlet pipeline, production outlet pipeline, the steam export of hot water tower is connected with the shell side import pipeline of condenser, and the shell side export of condenser is connected with the outlet pipeline of hot water tower, and production water inlet pipeline is connected with the tube side import pipeline of condenser, and the tube side export of condenser is connected with production outlet pipeline, the flowmeter is equipped with production water inlet pipeline, and the pipeline between the steam export of hot water tower and the shell side import of condenser is connected with first venting pipeline, and first venting pipeline is equipped with first venting valve, and condenser is equipped with second venting pipeline, and second venting pipeline is equipped with second venting valve, and second venting pipeline communicates with the shell side of condenser.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically to a waste heat recovery system for exhaust steam from a vinyl chloride converter. Background Technology

[0002] The vinyl chloride conversion process involves the reaction of hydrogen chloride and acetylene in a converter to produce vinyl chloride. This reaction is exothermic. Heat is transferred through hot water at around 95°C. The transferred hot water exists as a steam-water mixture. After steam-water separation, the hot water enters the conversion system for recycling. Uncondensed steam is vented through the top of the hot water tower (pressure 3-10 kPa, exhaust steam flow rate approximately 4 t / h). In winter, when the exhaust steam emits white smoke, some condensate will fall due to the low ambient temperature, affecting the surrounding environment. The heat from the steam discharged from the top of the hot water tower has recovery value. Direct discharge would cause ice to form around the equipment in winter, posing a risk of falls and wasting energy. Utility Model Content

[0003] The purpose of this invention is to provide a waste heat recovery system for the exhaust steam of a vinyl chloride converter.

[0004] This utility model is implemented by the following technical solution: a waste heat recovery system for vinyl chloride converter exhaust steam, which includes a hot water tower, a condenser, a production water inlet pipeline, and a production water outlet pipeline; The steam outlet of the hot water tower is connected to the shell-side inlet pipeline of the condenser, the shell-side outlet of the condenser is connected to the water outlet pipeline of the hot water tower, the production water inlet pipeline is connected to the tube-side inlet pipeline of the condenser, and the tube-side outlet of the condenser is connected to the production water outlet pipeline. The production water inlet pipeline is equipped with a flow meter, and a first vent pipeline is connected between the steam outlet of the hot water tower and the shell-side inlet of the condenser. The first vent pipeline is equipped with a first vent valve. The condenser is provided with a second vent line, the second vent line is provided with a second vent valve, and the second vent line is connected to the shell side of the condenser.

[0005] Furthermore, a maintenance pipeline is connected between the production water inlet pipeline and the production water outlet pipeline.

[0006] Furthermore, the outlet of the hot water tower is connected to an outlet pipeline, which is connected to the heating heat exchanger pipeline and the vinyl chloride distillation heating pipeline, respectively.

[0007] Furthermore, the inlet of the hot water tower is connected to the first water supply pipeline.

[0008] Furthermore, the outlet water pipeline is connected to a second water supply pipeline. The advantages of this utility model are: by sending the steam and hot water discharged from the converter to the condenser for heat exchange and condensation with the production water, the closed-loop recovery of steam condensate is achieved, reducing the exhaust steam emissions of the hot water tower in the vinyl chloride synthesis process, and achieving the dual goals of energy saving, emission reduction and cost reduction and efficiency improvement. It can not only help enterprises achieve the goal of eliminating white smoke, but also eliminate the hidden danger of safety accidents caused by the freezing of condensate around the first-phase hot water tower in winter. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the system of this utility model; In the diagram: 1. Hot water tower; 2. Condenser; 3. Production water inlet pipeline; 4. Production water outlet pipeline; 5. Outlet pipeline; 6. Flow meter; 7. First vent pipeline; 8. First vent valve; 9. Second vent pipeline; 10. Maintenance pipeline; 11. Heating heat exchanger pipeline; 12. Vinyl chloride distillation heating pipeline; 13. First water supply pipeline; 14. Second water supply pipeline; 15. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] like Figure 1 As shown, the waste heat recovery system of the vinyl chloride converter includes a hot water tower 1, a condenser 2, a production water inlet pipeline 3, and a production water outlet pipeline 4. The steam outlet of hot water tower 1 is connected to the shell-side inlet pipeline of condenser 2, and the shell-side outlet of condenser 2 is connected to the water outlet pipeline 5 of hot water tower 1. Condensate is sent to the water outlet pipeline 5. The production water inlet pipeline 3 is connected to the tube-side inlet pipeline of condenser 2, and the tube-side outlet of condenser 2 is connected to the production water outlet pipeline 4. The steam discharged from the top of hot water tower 1 exchanges heat with the production water in condenser 2, raising the temperature of the production water from 15 degrees to 40 degrees, which meets the temperature requirements of the production water.

[0013] The production water inlet pipeline 3 is equipped with a flow meter 6. A first vent pipeline 7 is connected between the steam outlet of the hot water tower 1 and the shell-side inlet of the condenser 2. The first vent pipeline 7 is equipped with a first vent valve 8. The flow meter 6 is used to detect the production water volume. When the production water volume decreases, if the decrease causes an increase in exhaust steam, the first vent valve 8 is opened, and the excess steam is vented through the first vent pipeline 7 and vented from the top of the hot water tower 1.

[0014] The condenser 2 is equipped with a second vent line 9, and the second vent line 9 is equipped with a second vent valve 10. The second vent line 9 is connected to the shell side of the condenser 2. When the second vent valve 10 is opened, if non-condensable gas is generated after the condenser 2 heats up, it will be discharged directly through the second vent line 9.

[0015] A maintenance pipeline 11 connects the production water inlet pipeline 3 and the production water outlet pipeline 4. When the condenser 2 is under maintenance, the first vent valve 8 is opened, and the steam of the hot water tower 1 is vented through the first vent pipeline 7. At the same time, the production water inlet pipeline 3 is sent to the production water outlet pipeline 4 through the maintenance pipeline 11, temporarily bypassing the condenser 2. After the condenser 2 is under maintenance, it will resume normal operation.

[0016] The outlet of hot water tower 1 is connected to water outlet pipeline 5, which is connected to heating heat exchanger pipeline 12 and vinyl chloride distillation heating pipeline 13 respectively. After the exothermic reaction of the converter is transferred through hot water, the hot water is sent to hot water tower 1. Therefore, the water temperature of hot water tower 1 is relatively high. This part of the hot water is used to heat the heating heat exchanger and the vinyl chloride distillation process, making full use of the heat.

[0017] The inlet of the hot water tower 1 is connected to the first water supply line 14, and the outlet line 5 is connected to the second water supply line 15, which serves as supplementary water for production.

[0018] By sending the steam and hot water discharged from the converter to the condenser 2 for heat exchange and condensation with the production water, the closed-loop recovery of steam condensate is achieved, reducing the exhaust steam emissions of the hot water tower 1 in the vinyl chloride synthesis process. This achieves the dual goals of energy conservation, emission reduction, cost reduction and efficiency improvement, further realizing energy conservation and consumption reduction. It can not only help enterprises achieve the goal of eliminating white smoke, but also eliminate the potential safety hazards caused by the freezing of condensate around the first-phase hot water tower 1 in winter.

[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery system for vinyl chloride converter exhaust steam, characterized in that, It includes a hot water tower, a condenser, a production water inlet pipeline, and a production water outlet pipeline; The steam outlet of the hot water tower is connected to the shell-side inlet pipeline of the condenser, the shell-side outlet of the condenser is connected to the water outlet pipeline of the hot water tower, the production water inlet pipeline is connected to the tube-side inlet pipeline of the condenser, and the tube-side outlet of the condenser is connected to the production water outlet pipeline. The production water inlet pipeline is equipped with a flow meter, and a first vent pipeline is connected between the steam outlet of the hot water tower and the shell-side inlet of the condenser. The first vent pipeline is equipped with a first vent valve. The condenser is provided with a second vent line, the second vent line is provided with a second vent valve, and the second vent line is connected to the shell side of the condenser.

2. The waste heat recovery system for vinyl chloride converter exhaust steam according to claim 1, characterized in that, A maintenance pipeline is connected between the production water inlet pipeline and the production water outlet pipeline.

3. The waste heat recovery system for vinyl chloride converter exhaust steam according to claim 2, characterized in that, The outlet of the hot water tower is connected to an outlet pipeline, which is connected to the heating heat exchanger pipeline and the vinyl chloride distillation heating pipeline, respectively.

4. The waste heat recovery system for vinyl chloride converter exhaust steam according to claim 3, characterized in that, The inlet of the hot water tower is connected to the first water supply pipeline.

5. The waste heat recovery system for vinyl chloride converter exhaust steam according to claim 4, characterized in that, The outlet water pipeline is connected to a second water supply pipeline.

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