Hybrid heat supply control system of multi-steam-source heat supply steam pipe network

Abstract

The utility model provides a mixed heat supply control system of a multi-steam-source heat supply steam pipe network. The mixed heat supply control system comprises a first steam main pipeline, a second steam main pipeline, a water supply device and a controller. A first heat supply flow meter, a first heat supply temperature and pressure measuring instrument, a first water spraying temperature reducing device, a second heat supply flow meter, a first steam control valve set and a second heat supply temperature and pressure measuring instrument are sequentially arranged on the first steam main pipeline in the steam flowing direction. A third heat supply flow meter, a third heat supply temperature and pressure measuring instrument, a second water spraying and temperature reducing device, a fourth heat supply flow meter, a second steam control valve set and a fourth heat supply temperature and pressure measuring instrument are sequentially arranged on the second steam main pipeline in the steam flowing direction. The outlet end of the first steam main pipeline and the outlet end of the second steam main pipeline both lead to a user pipeline, and a mixed heat supply user side control valve is arranged on the user pipeline. According to the utility model, accurate mixing control of heat supply steam with various heat sources and different parameters is realized.

Description

Technical Field

[0001] The utility model relates to the field of heat network automation control, in particular to a mixed heating control system for a multi-steam source heating steam pipe network. Background Art

[0002] With the development of long-distance pipeline heating technology, the heating scope of thermal power plants has been continuously expanded, and the number of heat users has been continuously increasing, which has also put forward higher requirements for the safety, reliability and continuity of the heating pipeline network. The traditional thermal power plant heating units are mostly operated in a one-in-one-standby mode. Under abnormal circumstances such as failure or tripping of a single operating unit, the single heat source point and pipeline heating operation mode will inevitably lead to the shutdown of the heating pipeline network and the interruption of heating for heat users. At the very least, it will affect the normal production and life of heat users such as enterprises. At worst, it will lead to obstruction of medical treatment for people's livelihood heat users such as hospitals, resulting in livelihood or social problems. This is especially true for electronics, chip, and pharmaceutical manufacturing companies that have high requirements for thermal stability. Serious problems may lead to huge claims from heat users. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the embodiment of the present invention provides a multi-steam source heating steam pipe network mixed heating control system, which realizes the precise mixing control of multiple heat sources and heating steam with different parameters, and improves the safety and reliability of the pipe network heating. To achieve the above technical objectives, the technical solutions adopted by the embodiment of the present invention are:

[0004] The embodiment of the utility model provides a multi-steam source heating steam pipe network mixed heating control system, comprising a first steam main line, a second steam main line, a water supply device, and a controller;

[0005] A first heating flow meter, a first heating temperature and pressure measuring instrument, a first water spray cooling device, a second heating flow meter, a first steam control valve group, and a second heating temperature and pressure measuring instrument are sequentially provided on the first steam main line along the steam flow direction;

[0006] A third heating flow meter, a third heating temperature and pressure measuring instrument, a second water spray cooling device, a fourth heating flow meter, a second steam control valve group, and a fourth heating temperature and pressure measuring instrument are sequentially provided on the second steam main line along the steam flow direction;

[0007] The outlet ends of the first steam main line and the second steam main line both lead to the user pipeline, and a mixed heating user-end control valve is provided on the user pipeline;

[0008] The water supply device includes a water tank, a water tank inlet valve, a water tank return valve, a first water pump, and a second water pump; the water inlet of the water tank is connected to the water inlet pipe, and the water tank inlet valve is arranged on the water inlet pipe; the water outlet of the water tank is connected to the inlet ends of the first water pump and the second water pump through pipelines respectively; the pipelines at the inlet ends of the first water pump and the second water pump are respectively provided with isolation valves; the pipelines at the outlet ends of the first water pump and the second water pump are also respectively provided with isolation valves; the isolation valves at the outlet ends of the first water pump and the second water pump are both connected to the water supply main, and a water pressure and water temperature measuring instrument is provided on the water supply main; the water supply main is connected to the water inlet ends of the first water spray cooling device and the second water spray cooling device through the first water supply branch pipe and the second water supply branch pipe respectively; a first water volume control valve group is arranged on the first water supply branch pipe, and a second water volume control valve group is arranged on the second water supply branch pipe; the water supply main is also connected to the return water branch pipe, the end of the return water branch pipe is connected to the return water outlet of the water tank, and a water tank return valve is arranged at the end of the return water branch pipe;

[0009] The first steam control valve group, the second steam control valve group, the first water control valve group, the second water control valve group, the first water pump and the second water pump are all controlled by a controller.

[0010] Furthermore, the first steam control valve group includes two steam control valve groups, which are connected in parallel; each steam control valve group includes an electric control valve and isolation valves located at both ends of the electric control valve, wherein the electric control valve is controlled by a controller.

[0011] Furthermore, the second steam control valve group includes two steam control valve groups, which are connected in parallel; each steam control valve group includes an electric control valve and isolation valves located at both ends of the electric control valve, wherein the electric control valve is controlled by a controller.

[0012] Furthermore, the first water control valve group includes an electrically controlled valve and isolation valves located at both ends of the electrically controlled valve, wherein the electrically controlled valve is controlled by a controller.

[0013] Furthermore, the second water control valve group includes an electrically controlled valve and isolation valves located at both ends of the electrically controlled valve, wherein the electrically controlled valve is controlled by a controller.

[0014] Furthermore, a first steam trap group is provided on the first steam main line after the first water spray cooling device.

[0015] Furthermore, a second steam trap group is provided on the second steam main line after the second water spray cooling device.

[0016] Furthermore, the water tank is provided with a liquid level control device.

[0017] Furthermore, a drain valve is provided at the bottom of the water tank.

[0018] The beneficial effects of the technical solution provided by the embodiment of the utility model are:

[0019] 1) Dual steam sources and dual steam main lines are used for mixed heating, which greatly improves heating safety compared with single steam source.

[0020] 2) It can accurately adjust and control the mixed steam pressure of dual steam sources to improve the accuracy of heating control.

[0021] 3) The dual-path water spray cooling device is used to precisely control the steam temperature of the dual-path heat source mixed heating system, so that the steam temperature of the dual-path heat source mixed heating system can be reasonably matched with the user's required temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a hybrid heating control system in an embodiment of the present utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] like Figure 1 As shown, the embodiment of the present invention proposes a multi-steam source heating steam pipe network mixed heating control system, comprising a first steam main line 1, a second steam main line 2, a water supply device 3, and a controller 4;

[0025] On the first steam main line 1, a first heat supply flow meter 101, a first heat supply temperature and pressure measuring instrument 102, a first water spray cooling device 103, a second heat supply flow meter 104, a first steam control valve group 105, and a second heat supply temperature and pressure measuring instrument 106 are sequentially provided along the steam flow direction;

[0026] On the second main steam line 2, a third heat supply flow meter 201, a third heat supply temperature and pressure measuring instrument 202, a second water spray cooling device 203, a fourth heat supply flow meter 204, a second steam control valve group 205, and a fourth heat supply temperature and pressure measuring instrument 206 are sequentially provided along the steam flow direction;

[0027] The outlet ends of the first steam main line 1 and the second steam main line 2 are both connected to the user pipeline, and the user pipeline is provided with a mixed heating user end control valve 5;

[0028] The water supply device 3 includes a water tank 301, a water tank water inlet valve 302, a water tank return valve 303, a first water pump 304, and a second water pump 305; the water inlet of the water tank 301 is connected to the water inlet pipe, and the water tank water inlet valve 302 is provided on the water inlet pipe; the water outlet of the water tank 301 is connected to the inlet end of the first water pump 304 and the second water pump 305 through pipelines; the pipelines at the inlet end of the first water pump 304 and the second water pump 305 are respectively provided with isolation valves; the pipelines at the outlet end of the first water pump 304 and the second water pump 305 are also respectively provided with isolation valves; the outlet end of the first water pump 304 and the second water pump 305 The isolation valves are all connected to the water supply main 306, which is equipped with a water pressure and water temperature measuring instrument 307; the water supply main 306 is connected to the water inlet of the first water spray cooling device 103 and the second water spray cooling device 203 through the first water supply branch pipe and the second water supply branch pipe respectively; a first water flow control valve group 308 is provided on the first water supply branch pipe, and a second water flow control valve group 309 is provided on the second water supply branch pipe; the water supply main 306 is also connected to the return water branch pipe 310, the end of which is connected to the return water inlet of the water tank 301, and a water tank return valve 303 is provided at the end of the return water branch pipe 310;

[0029] The first steam control valve group 105 , the second steam control valve group 205 , the first water control valve group 308 , the second water control valve group 309 , the first water pump 304 and the second water pump 305 are all controlled by the controller 4 .

[0030] The multi-steam source heating steam pipeline mixed heating control system proposed in the embodiment of the present invention can realize dual-path heat source mixed heating and accurately adjust the mixed steam pressure of the dual-path heat sources; taking the first steam main line 1 as an example, the steam flow supplied by the heat source A can be monitored by the first heating flowmeter 101, and the steam flow in the first steam main line 1 can be monitored by the second heating flowmeter 104; the temperature and pressure of the steam supplied by the heat source A can be monitored by the first heating temperature and pressure measuring instrument 102, and the temperature and pressure of the steam output from the first steam main line 1 can be monitored by the second heating temperature and pressure measuring instrument 106; the controller 4 can control the opening of the first steam control valve group 105 and the second steam control valve group 205 according to the pressure of the steam output from the first steam main line 1 and the second steam main line 2 respectively, so as to realize accurate adjustment of the mixed steam pressure.

[0031] The multi-steam source heating steam pipeline mixed heating control system proposed in the embodiment of the present invention can also achieve a reasonable match between the steam temperature of the dual-path heat source mixed heating and the user's required temperature; by monitoring the temperature of the steam output by the first steam main line 1 and the temperature of the steam output by the second steam main line 2, the controller 4 can respectively control the opening of the first water control valve group 308 and the second water control valve group 309, thereby respectively adjusting the temperature of the steam output by the first steam main line 1 and the temperature of the steam output by the second steam main line 2, so as to achieve precise control of the steam temperature of the dual-path heat source mixed heating.

[0032] The controller 4 can also monitor the water temperature and water pressure of the cooling water of the water supply device 3 in real time. When the cooling water pressure is abnormal, an alarm is issued to remind maintenance personnel to inspect the water pump.

[0033] More preferably, the first steam control valve group 105 includes two groups of steam control valve groups, which are connected in parallel; each group of steam control valve groups includes an electric control valve and isolation valves located at both ends of the electric control valve, and the electric control valves are controlled by the controller 4; when the isolation valves at both ends of the electric control valve are closed, the electric control valve can be inspected or replaced; the purpose of setting up two groups of steam control valve groups is to improve reliability. When one group of steam control valve groups is in use, the other group of steam control valve groups is used as a backup and can replace the main steam control valve group at any time.

[0034] Similarly, the second steam control valve group 205 includes two steam control valve groups, which are connected in parallel; each steam control valve group includes an electric control valve and isolation valves located at both ends of the electric control valve, wherein the electric control valve is controlled by the controller 4.

[0035] More preferably, the first water control valve group 308 includes an electric control valve and isolation valves located at both ends of the electric control valve, wherein the electric control valve is controlled by the controller 4.

[0036] More preferably, the second water control valve group 309 includes an electrically controlled valve and isolation valves located at both ends of the electrically controlled valve, wherein the electrically controlled valve is controlled by the controller 4 .

[0037] More preferably, a first steam trap group 107 is provided on the first steam main line 1 after the first water spray cooling device 103 ; if a small amount of condensed water exists in the first steam main line 1 , it can be discharged through the first steam trap group 107 .

[0038] More preferably, a second steam trap group 207 is provided on the second steam main line 2 after the second water spray cooling device 203 ; if a small amount of condensed water exists in the second steam main line 2 , it can be discharged through the second steam trap group 207 .

[0039] More preferably, the water tank 301 is provided with a liquid level control device 311 to prevent the cooling water in the water tank 301 from overflowing.

[0040] More preferably, a drain valve 312 is provided at the bottom of the water tank 301 ; when not in use, the cooling water in the water tank 301 can be completely drained through the drain valve 312 .

[0041] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A multi-steam source heating steam pipe network mixed heating control system, characterized in that: It comprises a first main steam line (1), a second main steam line (2), a water supply device (3), and a controller (4); A first heat supply flow meter (101), a first heat supply temperature and pressure measuring instrument (102), a first water spray cooling device (103), a second heat supply flow meter (104), a first steam control valve group (105), and a second heat supply temperature and pressure measuring instrument (106) are sequentially provided on the first steam main line (1) along the steam flow direction; A third heat supply flow meter (201), a third heat supply temperature and pressure measuring instrument (202), a second water spray cooling device (203), a fourth heat supply flow meter (204), a second steam control valve group (205), and a fourth heat supply temperature and pressure measuring instrument (206) are sequentially provided on the second steam main line (2) along the steam flow direction; The outlet ends of the first steam main line (1) and the second steam main line (2) both lead to a user pipeline, and a mixed heating user-end control valve (5) is provided on the user pipeline; The water supply device (3) comprises a water tank (301), a water tank water inlet valve (302), a water tank return valve (303), a first water pump (304), and a second water pump (305); the water inlet of the water tank (301) is connected to a water inlet pipe, on which a water tank water inlet valve (302) is provided; the water outlet of the water tank (301) is connected to the inlet ends of the first water pump (304) and the second water pump (305) through pipelines; the pipelines at the inlet ends of the first water pump (304) and the second water pump (305) are respectively provided with isolation valves; the pipelines at the outlet ends of the first water pump (304) and the second water pump (305) are also respectively provided with isolation valves; the first water pump (304) and the second water pump (305) are respectively provided with isolation valves. The isolation valves at the outlet end are all connected to the water supply main (306), and a water pressure and water temperature measuring instrument (307) is provided on the water supply main (306); the water supply main (306) is connected to the water inlet ends of the first water spray cooling device (103) and the second water spray cooling device (203) through the first water supply branch pipe and the second water supply branch pipe respectively; a first water volume control valve group (308) is provided on the first water supply branch pipe, and a second water volume control valve group (309) is provided on the second water supply branch pipe; the water supply main (306) is also connected to the return water branch pipe (310), the end of the return water branch pipe (310) is connected to the return water port of the water tank (301), and a water tank return water valve (303) is provided at the end of the return water branch pipe (310); The first steam control valve group (105), the second steam control valve group (205), the first water control valve group (308), the second water control valve group (309), the first water pump (304) and the second water pump (305) are all controlled by a controller (4).

2. The multi-steam source heating steam pipe network mixed heating control system according to claim 1, characterized in that: The first steam control valve group (105) includes two steam control valve groups, which are connected in parallel; each steam control valve group includes an electric control valve and isolation valves located at both ends of the electric control valve, wherein the electric control valve is controlled by a controller (4).

3. The multi-steam source heating steam pipe network mixed heating control system according to claim 1, characterized in that: The second steam control valve group (205) includes two steam control valve groups, which are connected in parallel; each steam control valve group includes an electric control valve and isolation valves located at both ends of the electric control valve, wherein the electric control valve is controlled by a controller (4).

4. The multi-steam source heating steam pipe network mixed heating control system according to claim 1, characterized in that: The first water control valve group (308) includes an electric control valve and isolation valves located at both ends of the electric control valve, wherein the electric control valve is controlled by a controller (4).

5. The multi-steam source heating steam pipe network mixed heating control system according to claim 1, characterized in that: The second water control valve group (309) comprises an electric control valve and isolation valves located at both ends of the electric control valve, wherein the electric control valve is controlled by a controller (4).

6. The multi-steam source heating steam pipe network mixed heating control system according to claim 1, characterized in that: A first steam trap group (107) is provided on the first steam main line (1) after the first water spraying cooling device (103).

7. The multi-steam source heating steam pipe network mixed heating control system according to claim 1, characterized in that: A second steam trap group (207) is provided on the second steam main line (2) after the second water spray cooling device (203).

8. The multi-steam source heating steam pipe network mixed heating control system according to claim 1, characterized in that: The water tank (301) is provided with a liquid level control device (311).

9. The multi-steam source heating steam pipe network mixed heating control system according to claim 1, characterized in that: A drain valve (312) is provided at the bottom of the water tank (301).

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