Material heat tracing control system in production process of vinylene carbonate

Abstract

The utility model belongs to the technical field of production of vinylene carbonate, and particularly relates to a material heat tracing control system in the production process of vinylene carbonate. Comprising a low-temperature condensate tank, a high-temperature condensate tank, a first heat tracing area and a second heat tracing area. The high-temperature condensate tank is used for storing steam condensate and heating the steam condensate, a liquid outlet of the high-temperature condensate tank is connected with the high-temperature condensate conveying pipeline, the high-temperature condensate conveying pipeline is connected with the first heat tracing area and the low-temperature condensate tank through two branch high-temperature pipelines, and the high-temperature condensate conveying pipeline is connected with a water return connector of the high-temperature condensate tank through a return line I; a liquid outlet of the low-temperature condensate tank is connected with the low-temperature condensate conveying pipeline, the low-temperature condensate conveying pipeline is connected with the second heat tracing area, and the low-temperature liquid supply main pipeline is connected with a water return connector of the low-temperature condensate tank through a return line II. Automatic control operation is achieved, manual adjustment is not needed, alarms are arranged on the liquid level, the temperature and the pressure, and after the alarms are triggered, operators can handle the alarms in time.

Description

Technical Field

[0001] The utility model belongs to the technical field of vinylene carbonate production, and particularly relates to a material heat tracing control system in the vinylene carbonate production process. Background Art

[0002] Vinyl carbonate (VC) is an organic substance that can be used as a new organic film-forming additive and overcharge protection additive for lithium-ion batteries. It has good high and low temperature performance and anti-flatulence function, and can improve the capacity and cycle life of the battery. At present, it is difficult for the existing vinyl carbonate preparation equipment to meet the synchronous control of temperature and pressure. In the production process of vinyl carbonate, due to the unstable nature of the material, high-temperature heating often occurs, causing the material to react, affecting the yield and product quality, or the temperature is too low, resulting in poor material fluidity, or even crystallization and solidification, making it impossible to circulate. At the same time, the process requires the use of corrosion-resistant enamel equipment, which has pressure restrictions on heating. Therefore, there is an urgent need for a material heating control system for the vinyl carbonate production process to meet the process temperature control requirements. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a material heating control system for the vinylene carbonate production process to solve the problems of high temperature heating in existing equipment causing material reaction, affecting yield and product quality, and too low temperature causing material fluidity to deteriorate, or even crystallization and solidification, making it impossible to circulate.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a material heating control system for the vinylene carbonate production process, comprising a low-temperature condensate tank, a high-temperature condensate tank, a first heating area and a second heating area;

[0006] The high-temperature condensate tank is used to store and heat steam condensate. The liquid outlet of the high-temperature condensate tank is connected to the high-temperature condensate delivery pipeline. The high-temperature condensate delivery pipeline is respectively connected to the first heating area and the low-temperature condensate tank through two branch high-temperature pipelines. The high-temperature condensate delivery pipeline is connected to the return water interface of the high-temperature condensate tank through the return line I.

[0007] The liquid outlet of the cryogenic condensate tank is connected to the cryogenic condensate delivery pipeline, the cryogenic condensate delivery pipeline is connected to the second heating area, and the cryogenic liquid supply main pipeline is connected to the return water interface of the cryogenic condensate tank through the return line II.

[0008] The first heating area includes a high-temperature and low-pressure heating area, a precise temperature control heating area and a high-temperature and high-pressure heating area arranged in parallel, wherein a mixing unit is provided at the front end of the precise temperature control heating area, and the mixing unit is connected to the low-temperature condensate tank; the high-temperature steam condensate of the high-temperature condensate tank and the low-temperature steam condensate of the low-temperature condensate tank are mixed by the mixing unit to reach a set temperature and then enter the precise temperature control heating area;

[0009] The high-temperature and low-pressure heating area, the precise temperature-controlled heating area and the high-temperature and high-pressure heating area are respectively connected to the high-temperature condensate tank through three return water pipelines to form a circulation pipeline; each return water pipeline is provided with a heating return water thermometer.

[0010] The mixing unit includes a mixer and a temperature-controlled buffer tank connected in sequence. A high-temperature condensate control valve and a low-temperature condensate control valve are respectively provided on the pipelines connecting the mixer with the high-temperature condensate tank and the low-temperature condensate tank. A mixing outlet thermometer is provided at the outlet of the mixer, a temperature-controlled buffer tank middle thermometer is provided on the temperature-controlled buffer tank, and a temperature-controlled buffer tank outlet pipeline thermometer is provided at the outlet of the temperature-controlled buffer tank. The flow rates of high and low-temperature steam condensates are respectively controlled by the high-temperature condensate control valve and the low-temperature condensate control valve.

[0011] A pressure reducing valve, a pressure gauge and a flow meter II are provided in sequence on the branch high-temperature pipeline connected to the high-temperature, low-pressure heating area, and the pressure reducing valve is used to control the pressure and flow of the high-temperature condensate entering the high-temperature, low-pressure heating area.

[0012] The high-temperature condensate tank is provided with an S-shaped steam coil, the S-shaped steam coil is provided with a plurality of air outlets, the S-shaped steam coil is connected to an external steam pipeline, the S-shaped steam coil heats the condensate with steam, and a steam regulating valve is provided on the external steam pipeline;

[0013] The high-temperature condensate tank is provided with a high-temperature condensate tank thermometer, and the high-temperature condensate tank thermometer is used to detect the temperature inside the high-temperature condensate tank.

[0014] The high-temperature condensate tank is provided with a double liquid level gauge, which is used to detect the liquid level in the high-temperature condensate tank; a regulating valve III is provided on the branch high-temperature pipeline between the high-temperature condensate tank and the low-temperature condensate tank; when the liquid level in the high-temperature condensate tank reaches the upper limit height, the regulating valve III is automatically triggered to open, and the steam condensate in the high-temperature condensate tank is discharged into the low-temperature condensate tank.

[0015] The high-temperature condensate delivery pipeline is provided with a high-temperature condensate pump, an inlet cut-off valve I and a flow meter I in sequence. The inlet cut-off valve I is arranged between two branch high-temperature pipelines for switching the two branch high-temperature pipelines.

[0016] The low-temperature condensate tank is connected to the recovery interface of the high-temperature condensate tank through a low-temperature condensate return pipeline, and a regulating valve II is arranged on the low-temperature condensate return pipeline.

[0017] The second heating zone includes a low temperature heating zone;

[0018] A low-temperature condensate pump, an inlet cut-off valve II and a flow meter VI are sequentially arranged on the low-temperature condensate transport pipeline. The low-temperature heating area is connected to the low-temperature condensate tank, the high-temperature condensate tank and the external procurement line through three low-temperature heating area recovery pipelines, and regulating valves are arranged on the three low-temperature heating area recovery pipelines.

[0019] The low-temperature condensate tank is provided with a double liquid level gauge III, a double liquid level gauge VI and a low-temperature condensate tank thermometer.

[0020] The advantages and beneficial effects of the utility model are as follows: the utility model provides a material heating control system for the vinylene carbonate production process, which performs segmented control on different heating areas, so that the heating temperature and pressure of the high-temperature heating area and the low-temperature heating area are stabilized within the range of process requirements, and can realize automatic control operation without manual adjustment. Alarms are set for the liquid level, temperature and pressure. After the alarm is triggered, the operator can handle it in time, thereby improving product quality and material fluidity and reducing production costs.

[0021] The utility model is designed with four heating working conditions, namely high temperature and high pressure heating area, high temperature and low pressure heating area, precise temperature control heating area, and low temperature heating area. The temperature requirements of each section are different, and the temperature is controlled separately, so the heating system can meet the synchronous control of temperature and pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model is a structural schematic diagram of a material heating control system in a vinylene carbonate production process.

[0023] In the figure: 1-water supply line regulating valve, 2-inlet pipeline thermometer, 3-double liquid level gauge Ⅰ, 4-double liquid level gauge Ⅱ, 5-high temperature condensate tank thermometer, 6-steam regulating valve, 7-S-type steam coil, 8-flow meter Ⅰ, 9-warm pump cross line Ⅰ, 10-warm pump cross line Ⅱ, 11-inlet cut-off valve Ⅰ, 12-return line Ⅰ, 13-high temperature condensate pump Ⅰ, 14-high temperature condensate pump Ⅱ, 15-pressure reducing valve, 16-pressure gauge, 17-flow meter Ⅱ, 18-heating return water thermometer Ⅰ, 19-high temperature condensate control valve, 20-mixing outlet thermometer, 21-mixer, 22-low temperature condensate control valve, 23-temperature control buffer tank middle thermometer, 24-temperature control buffer tank, 25-temperature control buffer tank outlet pipeline thermometer, 26-heating return water thermometer Ⅱ, 27-flow meter Ⅲ, 28-heating return water thermometer Ⅲ, 29-regulating valve Ⅰ, 30-regulating valve Ⅱ, 31-regulating valve Ⅲ, 32-double liquid level gauge Ⅲ, 33-low temperature condensate tank thermometer, 34-return line Ⅱ, 35-low temperature condensate tank, 36-double liquid level gauge Ⅵ, 37-regulating valve Ⅵ, 38-low temperature condensate pump Ⅰ, 39-low temperature condensate pump Ⅱ, 40-warming pump cross line Ⅲ, 41-warming pump cross line Ⅵ, 4 2-Inlet cut-off valve II, 43-Flowmeter VI, 44-Heating return water thermometer VI, 45-Flowmeter V, 46-Regulating valve V, 47-Regulating valve IV, 48-High temperature condensate tank, 49-Steam condensate line, 50-Water replenishment line, 51-External procurement line, 52-High temperature and low pressure heating area, 53-Precision temperature control heating area, 54-High temperature and high pressure heating area, 55-Low temperature heating area. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See also Figure 1 As shown, the utility model provides a material heating control system for the vinylene carbonate production process, including a low-temperature condensate tank 35, a high-temperature condensate tank 48, a first heating area and a second heating area, wherein the liquid inlet of the high-temperature condensate tank 48 is connected to the steam condensate line 49 and the water replenishment line 50, and the high-temperature condensate tank 48 is used to store and heat the steam condensate. The liquid outlet of the high-temperature condensate tank 48 is connected to the high-temperature condensate delivery pipeline, and the high-temperature condensate delivery pipeline is respectively connected to the first heating area and the low-temperature condensate tank 35 through two branch high-temperature pipelines, and the high-temperature condensate delivery pipeline is connected to the high-temperature condensate return water interface of the high-temperature condensate tank 48 through the return line Ⅰ12; the liquid outlet of the low-temperature condensate tank 35 is connected to the low-temperature condensate delivery pipeline, and the low-temperature condensate delivery pipeline is connected to the second heating area, and the low-temperature liquid supply main pipeline is connected to the low-temperature condensate return water interface of the low-temperature condensate tank 35 through the return line Ⅱ34.

[0026] See also Figure 1As shown, in the embodiment of the utility model, an S-shaped steam coil 7 is provided in the high-temperature condensate tank 48, a plurality of air outlets are provided on the S-shaped steam coil 7, the S-shaped steam coil 7 is connected to an external steam pipeline, the S-shaped steam coil 7 heats the condensate water by steam, a steam regulating valve 6 is provided on the external steam pipeline, and the flow rate of the steam is regulated by the steam regulating valve 6; a high-temperature condensate tank thermometer 5 is provided on the high-temperature condensate tank 48, and the high-temperature condensate tank thermometer 5 is used to detect the temperature inside the high-temperature condensate tank 48.

[0027] Specifically, the S-shaped steam coil 7 is fixed at a position 400mm away from the bottom of the tank, and a φ10mm air outlet hole is opened every 50mm on the coil. Furthermore, the bottom and side of the high-temperature condensate tank 48 are respectively provided with a double liquid level gauge I3 and a double liquid level gauge II4, which are used to detect the high and low limit liquid levels at different positions in the high-temperature condensate tank 48. A regulating valve III31 is provided on the branch high-temperature pipeline between the high-temperature condensate tank 48 and the low-temperature condensate tank 35; when the liquid level in the high-temperature condensate tank 48 reaches the upper limit height, the regulating valve III31 is automatically triggered to open, and the steam condensate in the high-temperature condensate tank 48 is discharged into the low-temperature condensate tank 35. The upper limit height of this embodiment is 70% of the tank height.

[0028] Furthermore, a liquid inlet line thermometer 2 is provided on the steam condensate line 49, and the temperature of the feed line and the temperature in the high-temperature condensate tank 48 are monitored by the liquid inlet line thermometer 2 and the high-temperature condensate tank thermometer 5. The fluctuation of the workshop system can be checked in advance through the pipeline temperature. If the fluctuation range is too large, it is possible to timely check whether there is a problem with the workshop steam heater, and at the same time, be prepared for manual intervention in the condensate control system. A water supply line regulating valve 1 is provided on the water supply line 50, and the water supply amount is controlled by the water supply line regulating valve 1.

[0029] In the embodiment of the utility model, a high-temperature condensate pump, an inlet shut-off valve Ⅰ11 and a flowmeter Ⅰ8 are sequentially arranged on the high-temperature condensate delivery pipeline. The inlet shut-off valve Ⅰ11 is arranged between two branch high-temperature pipelines for switching the two branch high-temperature pipelines. The high-temperature condensate pump includes a high-temperature condensate pump Ⅰ13 and a high-temperature condensate pump Ⅱ14 arranged in parallel. The outlets of the high-temperature condensate pump Ⅰ13 and the high-temperature condensate pump Ⅱ14 are both provided with a one-way valve, and the two one-way valves are respectively provided with a warm pump crossover line Ⅰ9 and a warm pump crossover line Ⅱ10, the purpose of which is to open in winter to prevent the standby pump from freezing and cracking. The outlets of the high-temperature condensate pump Ⅰ13 and the high-temperature condensate pump Ⅱ14 are connected to the return line Ⅰ12, which can directly return the high-temperature condensate to the high-temperature condensate tank 48. The function of the return line Ⅰ12 is that because the heating area is large, a 100m / h, 100m head condensate pump is used. When debugging and putting into use the exhaust of the heating pipeline, it needs to be put into use in groups. If the flow rate is too low in the early stage, the return line Ⅰ12 is opened to prevent the pump from being blocked.

[0030] In an embodiment of the utility model, the first heating area includes a high-temperature and low-pressure heating area 52, a precise temperature control heating area 53 and a high-temperature and high-pressure heating area 54 arranged in parallel, wherein a mixing unit is provided at the front end of the precise temperature control heating area 53, and the mixing unit is connected to the low-temperature condensate tank 35; the high-temperature steam condensate of the high-temperature condensate tank 48 and the low-temperature steam condensate of the low-temperature condensate tank 35 are mixed by the mixing unit to reach the set temperature and then enter the precise temperature control heating area 53; the high-temperature and low-pressure heating area 52, the precise temperature control heating area 53 and the high-temperature and high-pressure heating area 54 are respectively connected to the high-temperature condensate tank 48 through three return water pipelines to form a circulation pipeline; each return water pipeline is provided with a heating return water thermometer. Specifically, a heating return water thermometer Ⅰ18 is provided on the return water pipe of the high-temperature and low-pressure heating area 52, a heating return water thermometer Ⅱ26 and a flow meter Ⅲ27 are provided on the return water pipe of the precision temperature control heating area 53, and a heating return water thermometer Ⅲ28 and a regulating valve Ⅰ29 are provided on the return water pipe of the high-temperature and high-pressure heating area 54.

[0031] In an embodiment of the utility model, a branch high-temperature pipeline connected to the high-temperature, low-pressure heating area 52 is provided with a pressure reducing valve 15, a pressure gauge 16 and a flow meter II 17 in sequence, and the pressure reducing valve 15 is used to control the pressure and flow of the high-temperature condensate entering the high-temperature, low-pressure heating area 52.

[0032] In an embodiment of the utility model, the mixing unit includes a mixer 21 and a temperature-controlled buffer tank 24 connected in sequence, and a high-temperature condensate control valve 19 and a low-temperature condensate control valve 22 are respectively provided on the pipelines connecting the mixer 21 with the high-temperature condensate tank 48 and the low-temperature condensate tank 35. A mixing outlet thermometer 20 is provided at the outlet of the mixer 21, a temperature-controlled buffer tank middle thermometer 23 is provided on the temperature-controlled buffer tank 24, and a temperature-controlled buffer tank outlet pipeline thermometer 25 is provided at the outlet of the temperature-controlled buffer tank 24. The flow rates of high and low-temperature steam condensates are respectively controlled by the high-temperature condensate control valve 19 and the low-temperature condensate control valve 22.

[0033] In the embodiment of the utility model, a dual liquid level gauge III32, a dual liquid level gauge VI36 and a cryogenic condensate tank thermometer 33 are provided on the cryogenic condensate tank 35, wherein the dual liquid level gauge III32 is arranged on the top of the cryogenic condensate tank 35, and the dual liquid level gauge VI36 is arranged on the side of the cryogenic condensate tank 35. The high and low limit liquid levels at different positions of the cryogenic condensate tank 35 are respectively detected by the dual liquid level gauge III32 and the dual liquid level gauge VI36, and the cryogenic condensate tank thermometer 33 is used to detect the internal temperature of the cryogenic condensate tank 35. A cryogenic condensate pump, an inlet shut-off valve II 42 and a flow meter VI 43 are provided in sequence on the cryogenic condensate transport pipeline connected to the cryogenic condensate tank 35. The cryogenic condensate pump comprises a cryogenic condensate pump I 38 and a cryogenic condensate pump II 39 arranged in parallel. The outlets of the cryogenic condensate pump I 38 and the cryogenic condensate pump II 39 are both provided with a one-way valve. A warm pump jumper III 40 and a warm pump jumper VI 41 are respectively provided at the two one-way valves, which are opened in winter to prevent the standby pump from freezing and cracking.

[0034] Furthermore, the low temperature condensate tank 35 is connected to the recovery interface of the high temperature condensate tank 48 through a low temperature condensate return pipeline, and a regulating valve II 30 is provided on the low temperature condensate return pipeline. A regulating valve III 31 is provided on the branch high temperature pipeline connected to the low temperature condensate tank 35.

[0035] Furthermore, the second heating area includes a low-temperature heating area 55; a heating return water thermometer VI 44 is provided on the terminal pipeline of the low-temperature heating area 55, and the low-temperature heating area 55 is respectively connected to the low-temperature condensate tank 35, the high-temperature condensate tank 48 and the external procurement line 51 through three low-temperature heating area recovery pipelines, and regulating valves are provided on the three low-temperature heating area recovery pipelines. Specifically, a regulating valve VI 37 is provided on the low-temperature heating area recovery pipeline connected to the low-temperature condensate tank 35, a flow meter V 45 and a regulating valve V 46 are provided on the low-temperature heating area recovery pipeline connected to the external procurement line 51, and a regulating valve IV 47 is provided on the low-temperature heating area recovery pipeline connected to the high-temperature condensate tank 48.

[0036] The utility model provides a material heat tracing control system for the vinylene carbonate production process, and its working principle is:

[0037] Steam condensate is used as the workshop heating circulation fluid. Steam condensate directly enters the high-temperature condensate tank 48 through the steam condensate line 49. The feed pipeline temperature and the tank temperature are monitored. The fluctuation of the workshop system can be checked in advance through the feed pipeline temperature. If the fluctuation is too large, the workshop steam heater can be checked in time to see if there is a problem, and the condensate control system can be manually intervened. The S-shaped steam coil 7 is set in the high-temperature condensate tank 48 so that the steam directly heats the condensate. The temperature in the high-temperature condensate tank 48 is automatically controlled by the steam regulating valve 6 on the side of the high-temperature condensate tank 48, and the temperature is set to 70 degrees. The function of the water supply line regulating valve 1 on the water supply line 50 is to appropriately reduce the temperature in the high-temperature condensate tank 48 by water supply in the early stage of the test run, when the heating system is debugged or because the system heat loss is too small, and the condensate is transported to the downstream equipment and pipelines by the high-temperature condensate pump I13 and the high-temperature condensate pump II14.

[0038] The first heating area includes the high-temperature and low-pressure heating area 52, the precise temperature control heating area 53 and the high-temperature and high-pressure heating area 54 arranged in parallel. In the high-temperature and low-pressure heating area 52, due to the need for pressure reduction of low-pressure equipment such as enamel, the pressure is lower than 0.3Mpa after the pressure reduction through the pressure reducing valve 15. The pressure gauge 16 and the flow meter II 17 are installed after the pressure reducing valve 15. The purpose of the pressure gauge 16 is to ensure the pressure reduction effect and prevent damage to the equipment. The function of the flow meter II 17 is to ensure that the flow is within a reasonable range. Because there are many pipelines in the rear heating station, each branch needs to use a manual valve to adjust the opening and limit the flow to ensure that each branch has a heating effect. If the flow is abnormal, it is necessary to find out the cause. The heating return water thermometer I 18 on the return water pipeline of the high-temperature and low-pressure heating area 52 ensures that this temperature point is above 60 degrees, and monitors the overall heating of low-pressure equipment and pipelines to meet the production process requirements.

[0039] When entering the precise temperature control and heating area 53, the high and low temperature steam condensates are firstly allowed to enter the mixer 21 at the same time through the high temperature condensate control valve 19 and the low temperature condensate control valve 22, and then enter the temperature control buffer tank 24. An exhaust valve is arranged on the top of the temperature control buffer tank 24, which is used for exhaust in the early stage. After the steam condensate comes out of the buffer tank 24, it goes to the precise temperature control and heating area 53. A mixed outlet thermometer 20 is arranged behind the mixer 21. The high temperature condensate control valve 19 and the low temperature condensate control valve 22 adopt the split range control mode, so that the temperature after mixing is set to 50 degrees. Through the middle thermometer 23 of the temperature control buffer tank and the outlet pipeline thermometer 25 of the temperature control buffer tank, it is ensured that the value difference of the three thermometers is very small, so as to meet the heating demand. The heating return water thermometer II 26 and flowmeter III 27 provided on the return water pipeline of the precise temperature control and heating area 53 are used to monitor the operation and troubleshoot possible problems.

[0040] While meeting the heating temperature and pressure requirements, the high-temperature and high-pressure heating area 54 is responsible for balancing the liquid level control of the high-temperature condensate tank due to its large heating area. One way returns to the high-temperature condensate tank 48 through the regulating valve Ⅰ29 on the return water pipeline of the high-temperature and high-pressure heating area 54, and the other way goes to the low-temperature condensate tank 35 through the regulating valve Ⅱ30 provided on the low-temperature condensate return water pipeline. The two-way control valve also adopts the split-range control form. The return water pipeline of the high-temperature and high-pressure heating area 54 is provided with a heating return water thermometer Ⅲ28 to monitor the operation status, ensure the stability of the total heating flow, and guarantee the heating effect.

[0041] The outlets of the high-temperature condensate pumps I13 and II14 are connected directly to the low-temperature condensate tank 35 through the regulating valve III31. When the liquid level of the high-temperature condensate tank 48 reaches 70% high alarm, the regulating valve III31 is automatically triggered to adjust, so as to quickly reduce the liquid level and ensure the safe operation of the system.

[0042] The main function of the low-temperature condensate tank 35 is to meet the use of the low-temperature heating area. The low-temperature condensate tank thermometer 33 is used to monitor the condensate temperature. This tank has no pressure and precise temperature control requirements. After the low-temperature condensate passes through the low-temperature heating area 55, it returns to the low-temperature condensate tank 35 through the regulating valve VI 37 and sends the circulating liquid out through the regulating valve V 46. The split-range control form is also adopted to meet the balance of the low-temperature condensate tank liquid level requirements. The function of the flow meter V 45 is to count the amount of condensate sent out and monitor the operation of the system. The low-temperature condensate returns to the high-temperature condensate tank 48 through the regulating valve IV 47. The function of this regulating valve IV 47 is to control the heat balance of the entire heating system. When the amount of steam condensate is too low or the system heat loss is too large, causing the temperature of the low-temperature condensate tank 35 to be lower than 30 degrees, open this regulating valve IV 47 to make the high and low condensate tank temperatures complement each other, and indirectly control the temperature of the low-temperature condensate tank 35 through the steam heating of the high-temperature condensate tank 48. The warm pump crossover line Ⅰ9, warm pump crossover line Ⅱ10, warm pump crossover line Ⅲ40 and warm pump crossover line Ⅵ41 are set at the outlet check valve of each condensate pump. The purpose is to open it in winter to prevent the standby pump from freezing and cracking. The high-temperature condensate pump outlet is set with a return line Ⅰ12 that directly returns to the high-temperature condensate tank 48, and the low-temperature condensate pump outlet is set with a return line Ⅱ34 that directly returns to the low-temperature condensate tank 35. The purpose is that the heating area is large and 100m 3 / h, 100m head condensate pump, when debugging and putting into use, it needs to be put into use in groups when exhausting the heating pipeline. The flow rate is too low in the early stage, so open this return line to prevent the pump from being blocked. Both high and low temperature condensate tanks use dual liquid level gauges for display. When controlling, the two liquid level gauges can be switched. The purpose is that this control system is highly dependent on the accuracy of the liquid level gauge to prevent the system from being unable to operate due to an inaccurate liquid level gauge. If the liquid level gauge is found to be abnormal, it will be directly switched to the standby, and the abnormal liquid level gauge will be repaired as soon as possible. This control system is set to stop the condensate pump when the liquid level of the condensate tank is low, and close the inlet cut-off valve Ⅰ11 and the inlet cut-off valve Ⅱ42 to prevent the condensate pump from idling.

[0043] The utility model provides a material heat tracing control system for vinylene carbonate production process, which can realize automatic control operation without manual adjustment, and is provided with alarms for liquid level, temperature and pressure. After the alarm is triggered, the operator can handle it in time.

[0044] The above description is only an implementation method of the utility model and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A material heat tracing control system for vinylene carbonate production process, characterized in that: It includes a low-temperature condensate tank (35), a high-temperature condensate tank (48), a first heating area, and a second heating area; The high-temperature condensate tank (48) is used to store and heat steam condensate. The liquid outlet of the high-temperature condensate tank (48) is connected to a high-temperature condensate delivery pipeline. The high-temperature condensate delivery pipeline is respectively connected to the first heating area and the low-temperature condensate tank (35) through two branch high-temperature pipelines. The high-temperature condensate delivery pipeline is connected to the return water interface of the high-temperature condensate tank (48) through a return line I (12). The liquid outlet of the low-temperature condensate tank (35) is connected to the low-temperature condensate delivery pipeline, the low-temperature condensate delivery pipeline is connected to the second heating area, and the low-temperature liquid supply main pipeline is connected to the return water interface of the low-temperature condensate tank (35) through the return line II (34).

2. The material heat tracing control system for vinylene carbonate production process according to claim 1, characterized in that: The first heating area comprises a high-temperature and low-pressure heating area (52), a precise temperature control heating area (53) and a high-temperature and high-pressure heating area (54) arranged in parallel, wherein a mixing unit is provided at the front end of the precise temperature control heating area (53), and the mixing unit is connected to the low-temperature condensate tank (35); the high-temperature steam condensate of the high-temperature condensate tank (48) and the low-temperature steam condensate of the low-temperature condensate tank (35) are mixed by the mixing unit to reach a set temperature and then enter the precise temperature control heating area (53); The high-temperature and low-pressure heating area (52), the precise temperature-controlled heating area (53) and the high-temperature and high-pressure heating area (54) are respectively connected to the high-temperature condensate tank (48) via three return water pipelines to form a circulation pipeline; each return water pipeline is provided with a heating return water thermometer.

3. The material heat tracing control system for vinylene carbonate production process according to claim 2, characterized in that: The mixing unit comprises a mixer (21) and a temperature control buffer tank (24) connected in sequence; a high-temperature condensate control valve (19) and a low-temperature condensate control valve (22) are respectively provided on the pipelines connecting the mixer (21) with the high-temperature condensate tank (48) and the low-temperature condensate tank (35); a mixing outlet thermometer (20) is provided at the outlet of the mixer (21); a temperature control buffer tank middle thermometer (23) is provided on the temperature control buffer tank (24); and a temperature control buffer tank outlet pipeline thermometer (25) is provided at the outlet of the temperature control buffer tank (24); and the flow rates of high-temperature and low-temperature steam condensate are respectively controlled by the high-temperature condensate control valve (19) and the low-temperature condensate control valve (22).

4. The material heat tracing control system for vinylene carbonate production process according to claim 2, characterized in that: A pressure reducing valve (15), a pressure gauge (16) and a flow meter II (17) are provided in sequence on a branch high-temperature pipeline connected to the high-temperature low-pressure heating area (52). The pressure reducing valve (15) is used to control the pressure and flow of the high-temperature condensate entering the high-temperature low-pressure heating area (52).

5. The material heat tracing control system for vinylene carbonate production process according to claim 1, characterized in that: The high-temperature condensate tank (48) is provided with an S-shaped steam coil (7), the S-shaped steam coil (7) is provided with a plurality of air outlet holes, the S-shaped steam coil (7) is connected to an external steam pipeline, the S-shaped steam coil (7) heats the condensate with steam, and the external steam pipeline is provided with a steam regulating valve (6); The high-temperature condensate tank (48) is provided with a high-temperature condensate tank thermometer (5), and the high-temperature condensate tank thermometer (5) is used to detect the temperature inside the high-temperature condensate tank (48).

6. The material heat tracing control system for vinylene carbonate production process according to claim 1, characterized in that: The high-temperature condensate tank (48) is provided with a double liquid level gauge, which is used to detect the liquid level in the high-temperature condensate tank (48); a regulating valve III (31) is provided on the branch high-temperature pipeline between the high-temperature condensate tank (48) and the low-temperature condensate tank (35); when the liquid level in the high-temperature condensate tank (48) reaches an upper limit height, the regulating valve III (31) is automatically triggered to open, and the steam condensate in the high-temperature condensate tank (48) is discharged into the low-temperature condensate tank (35).

7. The material heat tracing control system for vinylene carbonate production process according to claim 1, characterized in that: The high-temperature condensate delivery pipeline is provided with a high-temperature condensate pump, an inlet cut-off valve I (11) and a flow meter I (8) in sequence. The inlet cut-off valve I (11) is arranged between two branch high-temperature pipelines and is used for switching the two branch high-temperature pipelines.

8. The material heat tracing control system for vinylene carbonate production process according to claim 1, characterized in that: The low-temperature condensate tank (35) is connected to the recovery interface of the high-temperature condensate tank (48) via a low-temperature condensate return pipeline, and a regulating valve II (30) is provided on the low-temperature condensate return pipeline.

9. The material heat tracing control system for vinylene carbonate production process according to claim 1, characterized in that: The second heating zone includes a low temperature heating zone (55); The low-temperature condensate delivery pipeline is provided with a low-temperature condensate pump, an inlet shut-off valve II (42) and a flow meter VI (43) in sequence. The low-temperature heating area (55) is connected to the low-temperature condensate tank (35), the high-temperature condensate tank (48) and the external collection line (51) respectively through three low-temperature heating area recovery pipelines. The three low-temperature heating area recovery pipelines are all provided with regulating valves.

10. The material heat tracing control system for vinylene carbonate production process according to claim 1, characterized in that: The low-temperature condensate tank (35) is provided with a double liquid level gauge III (32), a double liquid level gauge VI (36) and a low-temperature condensate tank thermometer (33).

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