Automatic temperature control system for chlor-alkali plant in north

Abstract

The utility model provides an automatic temperature control system for a northern chlor-alkali plant. The automatic temperature control system comprises a heat exchanger, a steam inlet adjusting valve is arranged at the front end of the heat exchanger, a heat supply main pipe temperature detector and a heat supply main valve are sequentially connected to the upper position of the rear end, and a condensate water return pipe is connected to the lower position of the rear end; the rear end of the heat supply main valve is connected with a heat supply branch. The heat supply branch comprises a heat supply branch pipe adjusting valve and a plant heat exchange device which are sequentially arranged. The plant heat exchange device is connected with the upper end of the hot water tank through a heat supply water return main pipe; the rear end of the hot water tank is sequentially connected with a water tank temperature monitor, a hot water pump and a hot water pump outlet pressure monitor; two branch pipelines are arranged behind the hot water pump outlet pressure monitor, one branch pipeline is connected with the heat exchanger through a valve, and the other branch pipeline is a hot water extraction pipe. The automatic temperature control system can be operated according to outdoor air temperature so as to meet different temperature requirements of various plants, manpower is saved, automatic temperature control and automatic operation of the plants are achieved, and automation and intellectualization are promoted.

Description

Technical Field

[0001] The utility model relates to the field of temperature control of northern factories, in particular to an automatic temperature control system of northern chlor-alkali factories. Background Art

[0002] With the rapid development of modern industry, chemical plants are developing more and more in various places. The temperature control requirements of chemical industry plants are usually set according to production needs and relevant national standards, and are generally maintained between 15℃ and 28℃. However, it is cold in the north in winter, with outdoor temperatures reaching -20℃ to -30℃, and low indoor temperatures, which have an impact on production equipment, pipelines, product quality, and employee working environment. At present, the traditional heating method basically relies on manual experience to adjust the heating system. Inexperience causes excessive temperature, waste of steam, and thus waste of resources. Utility Model Content

[0003] In view of the above technical problems, in order to solve the problems of manpower waste and resource waste caused by personnel controlling the heating system, the utility model provides an automatic temperature control system for a northern chlor-alkali plant, including a heat exchanger; a steam inlet regulating valve is provided at the front end of the heat exchanger, and the upper rear end is connected in sequence to a heating main pipe temperature detector and a heating main valve, and the lower rear end is connected to a condensate return pipe; a heating branch is connected to the rear end of the heating main valve, and the heating branch includes a heating branch pipe regulating valve and a plant heat exchanger arranged in sequence; an outlet pipeline of the plant heat exchanger is connected to the upper end of a hot water tank via a heating return main pipe, a pipeline is provided above the hot water tank and is connected to the condensate return pipe, and a water tank temperature monitor, a hot water pump and a hot water pump outlet pressure monitor are connected to the rear end of the hot water tank in sequence; two branch pipelines are arranged behind the hot water pump outlet pressure monitor, one branch pipeline is connected to the heat exchanger via valve 1, and the other branch pipeline is a hot water extraction pipe.

[0004] Furthermore, a primary water supply pipe and a drain pipe are provided above the hot water tank; the hot water tank is also equipped with a water tank liquid level monitor.

[0005] Furthermore, the heat exchanger uses steam as a heat source to heat the hot water.

[0006] Furthermore, an outdoor temperature detection system and an indoor temperature detection system are provided. The outdoor temperature detection system is interlocked with the steam inlet regulating valve, and the indoor temperature detection system is interlocked with the heating branch pipe regulating valve. The outdoor temperature detection system and the indoor temperature detection system are respectively used to monitor the outdoor and indoor temperatures in real time, and set the temperature according to demand to start the automatic temperature control program.

[0007] Furthermore, the heating main temperature detector is provided with a regulation interlock with the steam inlet regulating valve.

[0008] Furthermore, the hot water pump uses a variable frequency motor to adjust the operating efficiency, and the frequency of the hot water pump is comprehensively controlled by a water tank level monitor and a hot water pump outlet pressure monitor.

[0009] Furthermore, a temperature is set for the outdoor temperature detection system. When the outdoor temperature detected by the outdoor temperature detection system is ≤ the set temperature, the temperature control system starts to operate; when the outdoor temperature is ≥ the set temperature, the temperature control system stops operating.

[0010] Furthermore, the temperature is set for the indoor temperature detection system, and the temperature is controlled by utilizing the opening of the heating branch pipe regulating valve.

[0011] Furthermore, the rear end of the main heating valve can be connected to multiple parallel heating branches, on which heating branch regulating valves and plant heat exchange devices are arranged in sequence, and the ends of the multiple heating branches are connected to the heating return water main.

[0012] The beneficial effects of the utility model are that it can operate the automatic temperature control system according to the outdoor temperature to meet the different temperature requirements of each factory building, save manpower, avoid experience-based adjustment and control, effectively solve the waste of steam, realize automatic temperature control and automated operation of the factory building, and promote automation and intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of the automatic temperature control system of the Northern Chlor-Alkali Plant.

[0014] Figure 2 System working principle diagram of the utility model.

[0015] Explanation of the markings in the figure: outdoor temperature detection system 1, indoor temperature detection system 2, indoor temperature detection system 1 2´, indoor temperature detection system 2 2´´, steam inlet regulating valve 3, heat exchanger 4, condensate return pipe 5, heating main pipe temperature detector 6, heating main valve 7, heating branch pipe regulating valve 8, heating branch pipe regulating valve 1 8´, heating branch pipe regulating valve 2 8´´, plant heat exchange device 9, plant heat exchange device 1 9´, plant heat exchange device 2 9´´, heating return water main pipe 10, hot water tank 11, hot water pump 12, hot water pump outlet pressure monitor 13, water tank temperature monitor 14, water tank liquid level monitor 15, initial water supply pipe 16, vent pipe 17, hot water extraction pipe 18, valve 1 19, valve 2 20. DETAILED DESCRIPTION

[0016] The implementation scheme of the utility model will be described in detail below in conjunction with examples. The following examples are only used to illustrate the utility model and should not be regarded as limiting the scope of the utility model.

[0017] Example 1

[0018] A northern chlor-alkali plant automatic temperature control system comprises a heat exchanger 4; a steam inlet regulating valve 3 is provided at the front end of the heat exchanger 4, and a heat supply main pipe temperature detector 6 and a heat supply main valve 7 are connected in sequence at the upper rear end, and a condensate return pipe 5 is connected at the lower rear end; a heat supply branch is connected to the rear end of the heat supply main valve 7, and the heat supply branch includes a heat supply branch pipe regulating valve 8 and a plant heat exchange device 9 which are arranged in sequence; an outlet pipeline of the plant heat exchange device 9 is connected to the upper end of a hot water tank 11 through a heat supply return main pipe 10, a pipeline is provided above the hot water tank 11 and is connected to the condensate return pipe 5, and a water tank temperature monitor 14, a hot water pump 12 and a hot water pump outlet pressure monitor 13 are connected to the rear end of the hot water tank 11 in sequence; two branch pipelines are arranged behind the hot water pump outlet pressure monitor 13, one branch pipeline is connected to the heat exchanger 4 through a valve 19, and the other branch pipeline is a hot water extraction pipe 18.

[0019] Furthermore, a primary water supply pipe 16 and a drain pipe 17 are provided above the hot water tank 11 ; the hot water tank 11 is also equipped with a water tank liquid level monitor 15 .

[0020] Furthermore, the heat exchanger 4 uses steam as a heat source to heat the hot water.

[0021] Furthermore, an outdoor temperature detection system 1 and an indoor temperature detection system 2 are provided. The outdoor temperature detection system 1 is interlocked with the steam inlet regulating valve 3, and the indoor temperature detection system 2 is interlocked with the heating branch pipe regulating valve 8; the outdoor temperature detection system 1 and the indoor temperature detection system 2 are respectively used to monitor the outdoor and indoor temperatures in real time, and set the temperature according to demand to start the automatic temperature control program.

[0022] Furthermore, the heating main temperature detector 6 and the steam inlet regulating valve 3 are provided with a regulating interlock.

[0023] Furthermore, the hot water pump 12 uses a variable frequency motor to adjust the operating efficiency, and the frequency of the hot water pump 12 is comprehensively controlled by the water tank level monitor 15 and the hot water pump outlet pressure monitor 13.

[0024] Furthermore, a temperature is set for the outdoor temperature detection system 1. When the outdoor temperature detected by the outdoor temperature detection system 1 is ≤ the set temperature, the temperature control system starts to operate; when the outdoor temperature is ≥ the set temperature, the temperature control system stops operating.

[0025] Furthermore, the temperature of the indoor temperature detection system 2 is set, and the temperature is controlled by utilizing the opening of the heating branch pipe regulating valve 8 .

[0026] Furthermore, the rear end of the heating main valve 7 can be connected to multiple parallel heating branches, on which heating branch regulating valves and plant heat exchange devices are provided in sequence, and the ends of the multiple heating branches are connected to the heating return water main 10.

[0027] Example 2

[0028] This embodiment uses Figure 1 Taking the three parallel heating branches as an example, the principle of the automatic temperature control system of the northern chlor-alkali plant is described:

[0029] During operation, the water tank level monitor 15 confirms that the liquid level of the hot water tank 11 is at a normal level. When the outdoor temperature detection system 1 detects that the outdoor temperature is ≤ 0°C (the temperature setting is open and the temperature can be defined by the user), valve one 19 is opened, valve two 20 is closed, the heating main valve 7, the heating branch pipe regulating valve 8, the heating branch pipe regulating valve one 8', and the heating branch pipe regulating valve two 8'' are opened, the hot water pump 12 starts to run, and the water supply circulation loop is unblocked. The steam inlet regulating valve 3 is opened, and the opening of the steam inlet regulating valve 3 is PID controlled by the heating main pipe temperature detector 6 to maintain the water temperature at 55°C (the temperature setting is open and the temperature can be defined by yourself); the opening of the heating branch pipe regulating valve 8, the heating branch pipe regulating valve 1 8', and the heating branch pipe regulating valve 2 8'' are PID controlled by the indoor temperature detection system 2, the indoor temperature detection system 1 2', and the indoor temperature detection system 2 2'' in each plant respectively, so that the temperature of each plant is maintained at 25°C (the temperature setting is open and the temperature can be defined by yourself); the frequency of the hot water pump 12 is PID controlled by the water tank level monitor 15 and the hot water pump outlet pressure monitor 13. Steam enters the heat exchanger 4 through the steam inlet regulating valve 3, and the steam exchanges heat with the water from the hot water tank 11. The hot water after heat exchange enters the plant heat exchange device 9, the plant heat exchange device 1 9', and the plant heat exchange device 2 9'' to realize the plant heat exchange; the steam condensed in the heat exchanger 4 flows into the hot water tank 11 through the condensate return pipe 5.

[0030] When the water tank level monitor 15 detects that the liquid level of the hot water tank 11 is lower than the set liquid level, water is added to the hot water tank 11 to the set liquid level through the initial water supply pipe 16; when the liquid level is higher than the set liquid level, valve 20 is opened, and hot water is extracted to the set liquid level through the hot water extraction pipe 18.

[0031] When the outdoor temperature detection system 1 detects that the outdoor temperature is ≥10℃ (the temperature setting is open and the temperature can be defined by yourself), the heat exchange system stops running, the steam regulating valve 3 slowly closes, the main heating valve 7, the heating branch pipe regulating valve 8, the heating branch pipe regulating valve one 8´, the heating branch pipe regulating valve two 8´´, and the hot water pump 12 are closed, and the system stops running.

[0032] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. The automatic temperature control system of the northern chlor-alkali plant is characterized by: The invention comprises a heat exchanger (4); a steam inlet regulating valve (3) is provided at the front end of the heat exchanger (4); a heat supply main pipe temperature detector (6) and a heat supply main valve (7) are connected in sequence at the upper end of the rear end; a condensate return pipe (5) is connected at the lower end of the rear end; a heat supply branch is connected at the rear end of the heat supply main valve (7); the heat supply branch includes a heat supply branch pipe regulating valve (8) and a plant heat exchange device (9) arranged in sequence; an outlet pipe of the plant heat exchange device (9) is connected to the upper end of a hot water tank (11) via a heat supply return main pipe (10); a pipe is provided above the hot water tank (11) and is connected to the condensate return pipe (5); a water tank temperature monitor (14), a hot water pump (12) and a hot water pump outlet pressure monitor (13) are connected in sequence at the rear end of the hot water tank (11); two branch pipes are arranged behind the hot water pump outlet pressure monitor (13); one branch pipe is connected to the heat exchanger (4) via a valve 1 (19), and the other branch pipe is a hot water extraction pipe (18).

2. The automatic temperature control system for northern chlor-alkali plant according to claim 1 is characterized in that: An initial water supply pipe (16) and a drain pipe (17) are also provided above the hot water tank (11); the hot water tank (11) is also equipped with a water tank liquid level monitor (15).

3. The automatic temperature control system for northern chlor-alkali plant according to claim 1 is characterized in that: The heat exchanger (4) uses steam as a heat source to heat the hot water.

4. The automatic temperature control system for northern chlor-alkali plant according to claim 1 is characterized in that: An outdoor temperature detection system (1) and an indoor temperature detection system (2) are also provided. The outdoor temperature detection system (1) is interlocked with the steam inlet regulating valve (3), and the indoor temperature detection system (2) is interlocked with the heating branch pipe regulating valve (8). The outdoor temperature detection system (1) and the indoor temperature detection system (2) are used to monitor the outdoor and indoor temperatures in real time, respectively, and set the temperature according to demand to start the automatic temperature control program.

5. The automatic temperature control system for northern chlor-alkali plant according to claim 1 is characterized in that: The heating main pipe temperature detector (6) and the steam inlet regulating valve (3) are provided with a regulating interlock.

6. The automatic temperature control system for northern chlor-alkali plant according to claim 1 is characterized in that: The hot water pump (12) uses a variable frequency motor to adjust the operating efficiency, and the frequency of the hot water pump (12) is comprehensively controlled by a water tank liquid level monitor (15) and a hot water pump outlet pressure monitor (13).

7. The automatic temperature control system for northern chlor-alkali plant according to claim 4 is characterized in that: The outdoor temperature detection system (1) sets a temperature. When the outdoor temperature detected by the outdoor temperature detection system (1) is ≤ the set temperature, the temperature control system starts to operate; when the outdoor temperature is ≥ the set temperature, the temperature control system stops operating.

8. The automatic temperature control system for northern chlor-alkali plant according to claim 4 is characterized in that: The temperature of the indoor temperature detection system (2) is set, and the temperature is controlled by adjusting the opening of the heating branch pipe regulating valve (8).

9. The automatic temperature control system for northern chlor-alkali plant according to any one of claims 1 to 8, characterized in that: The rear end of the main heating valve (7) can be connected to a plurality of parallel heating branches, on which heating branch regulating valves and plant heat exchange devices are arranged in sequence, and the ends of the plurality of heating branches are connected to the heating return water main (10).

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