Heating pressure matching control system for power plant
By using interconnected steam pipelines and high-pressure steam injection to induced low-pressure auxiliary steam, the problem of insufficient heating pressure and flow rate during the power plant's heating process was solved, thereby increasing steam pressure and enhancing flow adaptability, thus improving the system's economy and operating efficiency.
Patent Information
- Application Number
- CN202520145462.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-01-22
AI Technical Summary
There are problems with insufficient heating pressure and flow during the heating process of power plants. In particular, the heating pressure at the end users often fails to meet the requirements, and the auxiliary steam flow cannot meet the demand. The problem is more pronounced when the unit is under low load.
By drawing steam through interconnected pipelines and injecting high-pressure steam at high speed to entice low-pressure auxiliary steam, the high-pressure cold reheat steam and low-pressure auxiliary steam are mixed in a pressure matching device using the Laval gas injection principle, thereby increasing the mixed steam pressure to meet user needs.
It effectively increases the initial steam pressure and flow rate of the heating main pipe, adapts to different flow rate changes, improves the economic benefits and operating efficiency of the system, and meets the growing heating demand of heat users.
Smart Images
Figure CN223869301U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power plant heating pressure control technology, specifically a power plant heating pressure matching control system. Background Technology
[0002] Currently, the two existing thermal power generating units face the following two major problems in the heating process:
[0003] 1. Insufficient heating pressure: In the initial stage of heating, the auxiliary steam of the second unit is used to supply steam to the heating main pipe. However, as the number of heating users in the park increases and the heating pipeline is extended, there is pressure loss in the heating pipeline, and the heating pressure of the end users often does not meet the requirements.
[0004] 2. Insufficient heating flow: As the amount of steam used by heat users continues to increase, the heating steam flow has increased from 20-30 tons to 50-80 tons. The heating flow of the auxiliary steam header cannot meet the demand, especially when the unit is under low load and the auxiliary steam pressure is low, the problem becomes more prominent.
[0005] Therefore, in order to solve the above problems, our company has developed a power plant heating pressure matching control system. It solves the existing technical problem of pressure loss and the fact that the heating pressure of the end heat users often does not meet the requirements by drawing steam through interconnected pipelines. In addition, this application uses high-pressure steam to inject low-pressure auxiliary steam at high speed, so that the pressure of the mixed steam is increased to meet the user's needs. Utility Model Content
[0006] The purpose of this utility model is to address the above-mentioned problems by providing a power plant heating pressure matching control system. This system, which uses a steam interconnection pipeline, solves the existing technical problem of pressure loss and insufficient heating pressure for end-users. Furthermore, this application uses high-pressure steam to inject low-pressure auxiliary steam at high speed, thereby increasing the mixed steam pressure to meet user requirements.
[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0008] A pressure matching control system for power plant heating includes a first electric actuator, a pressure matching device connected to the side of the first electric actuator, a first pipeline and a first control valve arranged on the side of the pressure matching device away from the first electric actuator, a desuperheater arranged on the side of the first pipeline, a second pipeline arranged on the side of the desuperheater, the pressure matching device including a receiving chamber, an adjusting screw arranged in the receiving chamber, a working steam inlet and a support seat arranged on the outside of the receiving chamber near the first electric actuator, a first mixing section and a first diffusion section arranged on the side of the receiving chamber, a mixed steam outlet arranged on the side of the first diffusion section, the mixed steam outlet being connected to the first pipeline through a connecting end, a plurality of low-pressure steam inlets arranged on the upper part of the receiving chamber, the first mixing section and the first diffusion section, and a fourth pipeline arranged on the low-pressure steam inlets.
[0009] As a further improvement to the above scheme, the top of the working steam inlet is connected to a fifth pipeline via a fourth control valve, and a second pressure gauge and a second temperature gauge are installed on the fifth pipeline.
[0010] As a further improvement to the above scheme, a third control valve is installed between the fourth pipeline and the low-pressure steam inlet, and a first temperature gauge and a first pressure gauge are installed on the fourth pipeline.
[0011] As a further improvement to the above solution, the desuperheater includes an outer protective tube, a second mixing section and a second diffusion section are provided inside the outer protective tube, a desuperheating water nozzle is provided on the side of the second mixing section, and a pressure-stabilizing water supply valve and a second electric actuator are provided above the desuperheating water nozzle.
[0012] As a further improvement to the above scheme, a desuperheating water inlet is provided on the side between the pressure-stabilizing water supply valve and the second electric actuator. The desuperheating water inlet is connected in sequence to the gate valve, the sixth pipeline and the sixth control valve.
[0013] As a further improvement to the above scheme, a shut-off valve, a safety valve, a third thermometer, a third pressure gauge, and a fifth control valve are sequentially installed on the steam discharge pipe.
[0014] As a further improvement to the above solution, the shut-off valve and the safety valve are electrically connected to the DCS, and the DCS is electrically connected to the second electric actuator and the first electric actuator.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by drawing steam through the interconnected steam pipeline, the technical problem of pressure loss and insufficient heating pressure for end users is solved. In addition, this application applies the Laval gas injection principle, which uses high-pressure steam to inject low-pressure auxiliary steam at high speed, thereby increasing the pressure of the mixed steam to meet the user's needs.
[0016] 1. Increase the initial steam pressure and flow rate of the heating header: By mixing high-pressure cold reheat steam with low-pressure auxiliary steam in the pressure matching device, the initial steam pressure and flow rate of the heating header are effectively increased, which meets the growing heat demand of heat users and solves the problems of insufficient heating pressure and insufficient heating flow rate for end heat users.
[0017] 2. Improve system economic efficiency: In the design of gas distribution, try to increase the pressure difference between the driving inlet steam and the suction steam, and reduce the pressure difference between the suction steam and the mixed outlet steam, thereby increasing the suction steam volume of the pressure matching device, increasing the utilization rate of low-pressure steam, and making the system operation more economical and efficient.
[0018] 3. Strong adaptability to flow rate changes: The pressure matching device can uniformly control the pressure and flow rate of the device, and can be used when the user's steam flow rate changes greatly (30%-100%). It has strong adaptability and can better meet the heat user's heat demand under different working conditions.
[0019] 4. High operating efficiency: In actual operation, the closer the pressure matching device is to the rated parameters, the higher the efficiency. By reasonably adjusting the ratio of each parameter, the energy-saving benefits of the matching device can be fully utilized, and the operating efficiency of the entire heating system can be improved. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the main structure of this utility model.
[0021] Figure 2 This is a partially enlarged schematic diagram of the pressure matching device of this utility model.
[0022] Figure 3 This is a partially enlarged schematic diagram of the desuperheater of this utility model.
[0023] The text labels in the diagram represent: 1. First electric actuator; 2. Pressure matching device; 3. First pipeline; 4. First control valve; 5. Desuperheater; 6. Second pipeline; 201. Support base; 202. Adjusting screw; 203. Receiving chamber; 204. First mixing section; 205. First diffusion section; 206. Mixed steam outlet; 207. Connection end; 208. Low-pressure steam inlet; 209. Fourth pipeline; 210. First pressure gauge; 211. First temperature gauge; 212. Third control valve; 213. Fourth control valve; 214. Fifth pipe; 215, Second pressure gauge; 216, Second temperature gauge; 217, Working steam inlet; 501, Desuperheating water nozzle; 502, Second mixing section; 503, Outer protective pipe; 504, Second diffuser section; 505, Steam discharge pipe; 506, Fifth control valve; 507, Third pressure gauge; 508, Third temperature gauge; 509, Safety valve; 510, Gate valve; 511, Sixth control valve; 512, Sixth pipe; 513, Gate valve; 514, Desuperheating water inlet; 515, Second electric actuator; 516, Pressure stabilizing water supply valve. Detailed Implementation
[0024] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to the embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.
[0025] like Figures 1-3As shown, the specific solution of this embodiment is as follows: a power plant heating pressure matching control system includes a first electric actuator 1, a pressure matching device 2 connected to the side of the first electric actuator 1, a first pipe 3 and a first control valve 4 arranged on the side of the pressure matching device 2 away from the first electric actuator 1, a desuperheater 5 arranged on the side of the first pipe 3, a second pipe 6 arranged on the side of the desuperheater 5, the pressure matching device 2 includes a receiving chamber 203, an adjusting screw 202 arranged in the receiving chamber 203, a working steam inlet 217 and a support base 201 arranged on the outside of the receiving chamber 203 near the first electric actuator 1, a first mixing section 204 and a first diffusion section 205 arranged on the side of the receiving chamber 203, a mixed steam outlet 206 arranged on the side of the first diffusion section 205, the mixed steam outlet 206 is connected to the first pipe 3 through a connecting end 207, a plurality of low-pressure steam inlets 208 are arranged on the upper part of the receiving chamber 203, the first mixing section 204 and the first diffusion section 205, and a fourth pipe 209 is arranged on the low-pressure steam inlets 208.
[0026] like Figure 1 As shown, in a preferred embodiment of the above, the top of the working steam inlet 217 is connected to the fifth pipe 214 via the fourth control valve 213, and the fifth pipe 214 is equipped with a second pressure gauge 215 and a second temperature gauge 216.
[0027] like Figure 1 As shown, in a preferred embodiment of the above, a third control valve 212 is provided between the fourth pipe 209 and the low-pressure steam inlet 208, and a first temperature gauge 211 and a first pressure gauge 210 are provided on the fourth pipe 209.
[0028] like Figure 1 As shown, in a preferred embodiment of the above, the desuperheater 5 includes an outer protective tube 503, a second mixing section 502 and a second diffusion section 504 are provided inside the outer protective tube 503, a desuperheating water nozzle 501 is provided on the side of the second mixing section 502, and a pressure stabilizing water supply valve 516 and a second electric actuator 515 are provided above the desuperheating water nozzle 501.
[0029] like Figure 1 As shown, in a preferred embodiment, a desuperheating water inlet 514 is provided on the side between the pressure-stabilizing water supply valve 516 and the second electric actuator 515. The desuperheating water inlet 514 is connected in sequence to the gate valve 513, the sixth pipeline 512 and the sixth control valve 511.
[0030] like Figure 1 As shown, in a preferred embodiment of the above, a shut-off valve 510, a safety valve 509, a third temperature gauge 508, a third pressure gauge 507 and a fifth control valve 506 are sequentially arranged on the steam discharge pipe 505.
[0031] like Figure 1As shown, in a preferred embodiment of the above, the shut-off valve 510 and the safety valve 509 are electrically connected to the DCS, and the DCS is electrically connected to the second electric actuator 515 and the first electric actuator 1.
[0032] The specific working principle of this utility model is as follows:
[0033] High-pressure steam enters the receiving chamber 203 through the working steam inlet 217. The fourth control valve 213 regulates the flow rate of the high-pressure steam to ensure that the pressure and temperature are within a predetermined range, monitored by the second pressure gauge 215 and the second temperature gauge 216. Low-pressure steam enters the pressure matching device 2 through the low-pressure steam inlet 208. The third control valve 212 regulates the flow rate of the low-pressure steam to ensure that the pressure and temperature are within a predetermined range, monitored by the first pressure gauge 210 and the first temperature gauge 211. The high-pressure steam mixes with the low-pressure steam in the first mixing section 204. The mixed steam diffuses in the first diffusion section 205 to increase the pressure. The mixed steam passes through the side of the mixed steam outlet 206 and the connecting end 207 to the first pipe 3. The mixed steam enters the second mixing section 502 of the desuperheater 5. Desuperheating water is injected through the desuperheating water nozzle 501 to mix with the steam. The pressure stabilizing water supply valve 516 and the second electric actuator 515 control the flow rate of the desuperheating water to ensure that the steam temperature is within a predetermined range. The mixed steam diffuses in the second diffusion section 504, further regulating its temperature. The regulated steam is then discharged through the steam discharge pipe 505. The shut-off valve 510 and safety valve 509 ensure safe system operation. The third temperature gauge 508 and the third pressure gauge 507 monitor the pressure and temperature of the discharged steam; the fifth control valve 506 regulates the flow rate of the discharged steam. During system control, the DCS system centrally controls the first electric actuator 1, the second electric actuator 515, the shut-off valve 510, and the safety valve 509 to ensure stable operation of the entire system.
[0034] It should be noted that, in this document, the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.
Claims
1. A power plant heating pressure matching control system, characterized in that, The system includes a first electric actuator (1), a pressure matching device (2) connected to the side of the first electric actuator (1), a first pipe (3) and a first control valve (4) provided on the side of the pressure matching device (2) away from the first electric actuator (1), a desuperheater (5) provided on the side of the first pipe (3), a second pipe (6) provided on the side of the desuperheater (5), the pressure matching device (2) includes a receiving chamber (203), an adjusting screw (202) provided in the receiving chamber (203), and working steam provided on the outside of the receiving chamber (203) near the first electric actuator (1). An inlet (217) and a support base (201) are provided. A first mixing section (204) and a first diffusion section (205) are provided on the side of the receiving chamber (203). A mixed steam outlet (206) is provided on the side of the first diffusion section (205). The side of the mixed steam outlet (206) is connected to a first pipe (3) through a connecting end (207). Multiple low-pressure steam inlets (208) are provided on the upper part of the receiving chamber (203), the first mixing section (204) and the first diffusion section (205). A fourth pipe (209) is provided on the low-pressure steam inlet (208).
2. The power plant heating pressure matching control system according to claim 1, characterized in that, The top of the working steam inlet (217) is connected to the fifth pipe (214) via the fourth control valve (213), and the fifth pipe (214) is equipped with a second pressure gauge (215) and a second temperature gauge (216).
3. A power plant heating pressure matching control system according to claim 1, characterized in that, A third control valve (212) is provided between the fourth pipe (209) and the low-pressure steam inlet (208), and a first thermometer (211) and a first pressure gauge (210) are provided on the fourth pipe (209).
4. A power plant heating pressure matching control system according to claim 1, characterized in that, The desuperheater (5) includes an outer protective tube (503), a second mixing section (502) and a second diffusion section (504) are provided inside the outer protective tube (503), a desuperheating water nozzle (501) is provided on the side of the second mixing section (502), and a pressure stabilizing water supply valve (516) and a second electric actuator (515) are provided above the desuperheating water nozzle (501).
5. A power plant heating pressure matching control system according to claim 4, characterized in that, A desuperheating water inlet (514) is provided on the side between the pressure-stabilizing water supply valve (516) and the second electric actuator (515). The desuperheating water inlet (514) is connected in sequence to the gate valve (513), the sixth pipeline (512) and the sixth control valve (511).
6. A power plant heating pressure matching control system according to claim 1, characterized in that, The steam discharge pipe (505) is sequentially equipped with a shut-off valve (510), a safety valve (509), a third thermometer (508), a third pressure gauge (507), and a fifth control valve (506).
7. A power plant heating pressure matching control system according to claim 6, characterized in that, The shut-off valve (510) and safety valve (509) are electrically connected to the DCS, and the DCS is electrically connected to the second electric actuator (515) and the first electric actuator (1).