Condensing steam type generator set heat supply system
By introducing reheating and cooling sections and pressure matchers into the condenser generator set to coordinate the two steam sources, the problems of large workloads of heating transformation and unstable parameters are solved, and a flexible adjustment and cost-effective heating system is realized. Meet the steam needs of hot users.
Patent Information
- Application Number
- CN202420960892.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-06
AI Technical Summary
The existing heating transformation method of condenser generator sets has problems such as large transformation workload, high costs or unstable heating parameters, which is difficult to meet the steam needs of hot users.
A condensing generator set heating system is adopted, including a steam turbine, a reheating and cooling section and a pressure matcher. It is connected to the medium-pressure cylinder and three-stage steam extraction of the steam turbine through the reheating and cooling section, and the two steam channels are coordinated by using a pressure matcher. The source meets the steam parameter needs of the hot user and is controlled through the steam extraction pipeline.
It has achieved small transformation workload and good economicality, flexible adjustment of steam volume and steam extraction parameters, meets the requirements of heat users, and ensures the stability and safety of heating parameters.
Smart Images
Figure CN222208036U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric power cogeneration, in particular to a condensing generator set heating system. Background Art
[0002] Condensing steam generator sets generate electricity by burning coal to make boiler steam reach certain parameters. The main measure to achieve centralized heating is to transform large condensing steam generator sets into heat supply units. Pumping part of the steam from the generator sets to heat users can open up new profit growth points for power generation companies, and at the same time, it can also achieve energy saving and carbon reduction of the generator sets, and improve the economic efficiency of the generator sets.
[0003] A large generator set can meet the production steam needs of multiple heat user enterprises. At present, there are two main ways to transform condensing steam generator sets for heating:
[0004] One is to modify the flow structure of the steam turbine of the heating unit. Modifying the flow structure of the steam turbine requires redesigning the structure. The power plant can achieve the most reasonable steam extraction parameters based on the heat demand, while also ensuring the safe operation and thermal efficiency of the steam turbine. However, this heating modification method is expensive and takes too long.
[0005] The second is to maintain the flow structure of the steam turbine, only appropriately expand the heat recovery steam extraction holes, and use the surplus non-adjustable extraction steam for heating; this heating transformation method has the advantages of small transformation amount, low cost and short time, but the disadvantage is that it is limited by the distance between the stages of the steam turbine blades and the safe operation of the steam turbine, the expansion of the heat recovery steam extraction holes is limited, the heating steam extraction volume is small, and the extraction parameters (flow, pressure, temperature) change with the unit load, and the heating parameters of the thermal power plant are unstable. Utility Model Content
[0006] The utility model aims to overcome the above-mentioned problems and provide a condensing steam generator set heating system, which has small workload for generator set transformation, good economy, and steam volume and extraction parameters that meet the requirements of heat users.
[0007] The purpose of the utility model is achieved through the following technical solutions:
[0008] A heating system for a condensing generator set comprises a steam turbine, a reheat cold section and a pressure matcher; wherein the steam inlet of the reheat cold section is connected to the steam extraction port of the intermediate pressure cylinder of the steam turbine; the first steam inlet of the pressure matcher is connected to the reheat cold section through a steam extraction pipeline; the second steam inlet of the pressure matcher is connected to the three-stage steam extraction of the steam turbine; and the steam outlet of the pressure matcher is connected to a heat user.
[0009] The working principle of the above-mentioned condensing steam generator set heating system is:
[0010] The pressure matcher has two steam sources, one is the steam from the reheat cold section, which is connected to the intermediate pressure cylinder of the steam turbine, and the other is the three-stage steam extraction of the steam turbine, which is connected to the steam turbine. The steam parameters of the reheat cold section are lower than the heating parameters (i.e., the steam parameters that meet the needs of heat users), and the steam parameters of the three-stage steam extraction are higher than the heating parameters. After the two steam sources are coordinated with each other through the pressure matcher, the heating parameters are met, and the steam is supplied to the heat users after passing through the pressure matcher.
[0011] In a preferred embodiment of the utility model, the steam extraction pipeline is provided with a first electric isolation valve, a pneumatic check valve, a pneumatic regulating valve and its bypass, a desuperheater, a flow meter and a second electric isolation valve in sequence according to the steam flow direction. In the above structure, in order to prevent the steam turbine from overspeeding and water ingress, or to immediately isolate the connection between the generator set and the heat network when the power station boiler MFT (main fuel trip) or an accident occurs at the user end of the heat network, a pneumatic check valve and two electric isolation valves are provided on the steam extraction pipeline. The electric isolation valve is the primary protection of the generator set, and the pneumatic check valve is mainly used for steam turbine overspeed protection, and also serves as a secondary protection to prevent water ingress to the steam turbine; the pneumatic control valve mainly adjusts the pressure of the steam extraction, and the pneumatic control valves of the two generator sets coordinately control the steam pressure on the steam extraction pipeline at the same time (the steam pressure after the valve should take into account the influence of the pipeline resistance in different generator sets, and the pressure drop should be compensated and adjusted accordingly) to meet the needs of heat users; at the same time, the pneumatic control valve can also regulate the flow rate of steam, so that the steam flow rate after temperature reduction and pressure reduction varies within the range of 25 to 100 t / h.
[0012] Furthermore, the bypass of the pneumatic regulating valve uses a pipe with the same diameter and a pneumatic regulating valve of the same model, which are used for mutual maintenance and standby.
[0013] Preferably, manual isolation valves are provided at both the front and rear ends of the pneumatic control valve for isolating the pneumatic control valve during maintenance.
[0014] Preferably, the condensing steam generator set heating system also includes a power station boiler, a low-temperature reheater, a high-temperature reheater and a superheater arranged in the power station boiler; wherein the steam inlet of the low-temperature reheater is connected to the steam outlet of the reheating cold section, and the steam outlet of the low-temperature reheater is connected to the steam inlet of the high-temperature reheater; the steam outlet of the high-temperature reheater is connected to the low-pressure cylinder of the steam turbine through the reheating hot section; the steam outlet of the superheater is connected to the high-pressure cylinder of the steam turbine through the superheating pipe. In the above structure, the power station boiler is used to burn fuel to generate steam, and the steam enters the superheater and is heated to superheated steam. The superheated steam enters the high-pressure cylinder of the steam turbine through the superheating pipe to do work, driving the rotor of the steam turbine to rotate, and then driving the generator to rotate and generate electricity; the steam that has done work is extracted from the medium-pressure cylinder of the steam turbine, and enters the low-temperature reheater and the high-temperature reheater in the power station boiler through the reheating cold section for reheating, and the heated steam is transported through the reheating hot section and returns to the low-pressure cylinder of the steam turbine to do work.
[0015] Preferably, a steam extraction interface is provided on the reheat cold section, and the steam inlet of the steam extraction pipeline is connected to the steam extraction interface. In the above structure, the steam extraction interface is provided to facilitate the connection between the reheat cold section and the steam extraction pipeline. The steam coming out of the steam extraction port of the intermediate pressure cylinder of the steam turbine is divided into two paths after passing through the reheat cold section, one path enters the steam extraction pipeline from the steam extraction interface, and the other path enters the low-temperature reheater.
[0016] Preferably, a condensate pipe is provided between the steam turbine and the power station boiler. In the above structure, the steam that has done work in the steam turbine becomes condensate and flows back to the power station boiler through the condensate pipe for heating to generate steam, which is circulated repeatedly to improve the utilization rate of water.
[0017] Compared with the prior art, the utility model has the following beneficial effects:
[0018] 1. The condensing generator set heating system of the utility model realizes heating for heat users by leading out a steam extraction pipeline in the reheat cold section and connecting it to the first steam inlet of the pressure matcher, and connecting it to the second steam inlet of the pressure matcher through the three-stage steam extraction of the steam turbine. The transformation workload is small, the operation is flexible, the adjustment range is large, and the economy is good.
[0019] 2. In the heating system of the condensing generator set in the utility model, the pressure matcher has two steam sources, one is the steam of the reheat cold section, which is connected to the intermediate pressure cylinder of the steam turbine, and the other is the three-stage extraction steam of the steam turbine, which is connected to the steam turbine. After the two steam sources are coordinated with each other through the pressure matcher, the extraction parameters meet the requirements of the heat users, and the steam that meets the requirements is supplied to the heat users after passing through the pressure matcher.
[0020] 3. The condensing generator set heating system of the utility model not only utilizes the exhaust steam from the high-pressure cylinder and the low-pressure cylinder of the steam turbine for heating, but also utilizes heat recovery extraction steam for heating, that is, it realizes steam supply to heat users through two steam sources, and the steam volume is large, which can meet the requirements of heat users.
[0021] 4. The condensing generator set heating system of the utility model utilizes the power station boiler to generate more steam for external supply, and the extraction of steam does not affect the normal power generation of the generator set; by leading out a steam extraction pipeline in the reheating cold section, the steam extraction pipeline is easy to connect, avoiding the modification of the generator set, and the modification is simple and the workload is small. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 The utility model is a schematic diagram of the structure of a condensing steam generator set heating system.
[0023] Figure 2 The utility model is a schematic diagram of the working of a condensing steam generator set heating system. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described below in conjunction with embodiments and drawings, but the implementation methods of the utility model are not limited thereto.
[0025] See also Figure 1-Figure 2 This embodiment discloses a heating system for a condensing steam generator set, comprising a steam turbine 1, a reheat cold section 2 and a pressure matcher 3; wherein the steam inlet of the reheat cold section 2 is connected to the steam extraction port of the intermediate pressure cylinder of the steam turbine 1; the first steam inlet of the pressure matcher 3 is connected to the reheat cold section 2 through a steam extraction pipeline 4; the second steam inlet of the pressure matcher 3 is connected to the three-stage steam extraction 5 of the steam turbine 1; the steam outlet of the pressure matcher 3 is connected to a heat user 6.
[0026] See also Figure 1-Figure 2The steam extraction pipeline 4 is provided with a first electric isolation valve, a pneumatic check valve, a pneumatic regulating valve and its bypass, a desuperheater, a flow meter and a second electric isolation valve in sequence according to the steam flow direction. In the above structure, in order to prevent the steam turbine 1 from overspeeding and water ingress, or to immediately isolate the connection between the generator set and the heat network when the power station boiler 7MFT (main fuel trip) or an accident occurs at the heat network user end (i.e., the heat user 6 end), the steam extraction pipeline 4 is provided with a pneumatic check valve and two electric isolation valves (i.e., the first electric isolation valve and the second electric isolation valve). The electric isolation valve is the primary protection of the generator set, and the pneumatic check valve is mainly used for overspeed protection of the steam turbine 1, and also serves as a secondary protection to prevent water ingress of the steam turbine 1; the main function of the second electric isolation valve is to immediately isolate the connection between the generator set and the heat network when an accident occurs at the heat network user end. The pneumatic regulating valve mainly adjusts the extraction steam pressure. The pneumatic regulating valves of the two generating sets simultaneously coordinate the steam pressure on the extraction steam pipeline 4 (the steam pressure after the valve should take into account the influence of the pipeline resistance in different generating sets, and the pressure drop should be compensated and adjusted accordingly) to meet the needs of the heat user 6; at the same time, the pneumatic regulating valve can also regulate the steam flow rate so that the steam flow rate after cooling and pressure reduction varies within the range of 25 to 100 t / h.
[0027] The function of the desuperheater is to spray water to cool down the heating steam when it is overheated, so as to ensure normal heating parameters. The function of the flow meter is to calculate the weight of the heating steam, and use this as the basis to charge heating fees to heat users.
[0028] See also Figure 1-Figure 2 The generator set is composed of the steam turbine 1 and the generator. After the steam enters the steam turbine 1, it drives the rotor of the steam turbine 1 to rotate, driving the generator to move, thereby realizing power generation.
[0029] Furthermore, the bypass of the pneumatic regulating valve uses a pipe with the same diameter and a pneumatic regulating valve of the same model, which are used for mutual maintenance and standby. In the above structure, the pipe with the same diameter, that is, the pipe used in the bypass, has the same diameter as the steam extraction pipe 4.
[0030] Manual isolation valves are provided at both the front and rear ends of the pneumatic control valve for isolating the pneumatic control valve during maintenance.
[0031] See also Figure 1-Figure 2The heating system of the condensing steam generator set also includes a power station boiler 7, a low-temperature reheater 8, a high-temperature reheater 9 and a superheater 10 arranged in the power station boiler 7; wherein the steam inlet of the low-temperature reheater 8 is connected to the steam outlet of the reheating cold section 2, and the steam outlet of the low-temperature reheater 8 is connected to the steam inlet of the high-temperature reheater 9; the steam outlet of the high-temperature reheater 9 is connected to the low-pressure cylinder of the steam turbine 1 through the reheating hot section 11; the steam outlet of the superheater 10 is connected to the high-pressure cylinder of the steam turbine 1 through the superheating pipe 12. In the above structure, the power station boiler 7 is used to burn fuel to generate steam. The steam enters the superheater 10 and is heated into superheated steam. The superheated steam enters the high-pressure cylinder of the steam turbine 1 through the superheating pipe 12 to perform work, driving the rotor of the steam turbine 1 to rotate, and then driving the generator to rotate and generate electricity; the steam that has done work is extracted from the medium-pressure cylinder of the steam turbine 1, enters the low-temperature reheater 8 and the high-temperature reheater 9 in the power station boiler 7 through the reheating cold section 2 for reheating, and the heated steam is transported through the reheating hot section 11 and returns to the low-pressure cylinder of the steam turbine 1 to perform work.
[0032] See also Figure 1-Figure 2 The reheat cold section 2 is provided with a steam extraction interface 13, and the steam inlet of the steam extraction pipeline 4 is connected to the steam extraction interface 13. In the above structure, the steam extraction interface 13 is provided to facilitate the communication between the reheat cold section 2 and the steam extraction pipeline 4. The steam coming out of the steam extraction port of the intermediate pressure cylinder of the steam turbine 1 is divided into two paths after passing through the reheat cold section 2, one path enters the steam extraction pipeline 4 from the steam extraction interface 13, and the other path enters the low-temperature reheater 8.
[0033] See also Figure 1-Figure 2 A condensate pipe 14 is provided between the steam turbine 1 and the power plant boiler 7. In the above structure, the steam that has done work in the steam turbine 1 becomes condensed water and flows back to the power plant boiler 7 through the condensate pipe 14 for heating to generate steam, which is circulated repeatedly to improve the utilization rate of water. The steam that has done work in the steam turbine 1 enters the condenser to cool, and after forming condensed water, it flows back to the power plant boiler 7 through the condensate pipe 14, that is, the condensate pipe 14 is connected to the outlet of the condenser.
[0034] See also Figure 1-Figure 2 In this embodiment, the steam supply parameters should be able to reach the steam parameters required at the steam extraction interface 13 when the steam turbine load is 150% or above; the steam extraction parameters should be as close to the steam usage parameters as possible to avoid high energy and low usage.
[0035] See also Figure 1-Figure 2 The working principle of the above condensing steam generator heating system is:
[0036] The pressure matcher 3 has two steam sources, one is the steam of the reheat cold section 2, which is connected to the intermediate pressure cylinder of the steam turbine 1, and the other is the three-stage extraction steam 5 of the steam turbine 1. The interface of the three-stage extraction steam 5 is on the steam turbine 1. The steam parameters of the reheat cold section 2 are lower than the heating parameters (that is, the steam parameters that meet the use of the heat user 6), and the steam parameters of the three-stage extraction steam 5 are higher than the heating parameters. After the two steam sources are coordinated with each other through the pressure matcher 3, the heating parameters are met, and the steam is supplied to the heat user 6 after passing through the pressure matcher 3.
[0037] The above is a preferred implementation mode of the present invention, but the implementation mode of the present invention is not limited by the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.
Claims
1. A condensing steam generator set heating system, characterized in that: It includes a steam turbine, a reheat cold section and a pressure matcher; wherein the steam inlet of the reheat cold section is connected to the steam extraction port of the intermediate pressure cylinder of the steam turbine; the first steam inlet of the pressure matcher is connected to the reheat cold section through an extraction pipe; the second steam inlet of the pressure matcher is connected to the three-stage extraction of the steam turbine; the steam outlet of the pressure matcher is connected to a heat user.
2. A condensing steam generator set heating system according to claim 1, characterized in that: The steam extraction pipeline is provided with a first electric isolation valve, a pneumatic check valve, a pneumatic regulating valve and its bypass, a desuperheater, a flow meter and a second electric isolation valve in sequence according to the steam flow direction.
3. A condensing steam generator set heating system according to claim 2, characterized in that: Manual isolation valves are provided at both the front and rear ends of the pneumatic regulating valve.
4. A condensing steam generator set heating system according to claim 1, characterized in that: The heating system of the condensing steam generator set also includes a power station boiler, a low-temperature reheater, a high-temperature reheater and a superheater arranged in the power station boiler; wherein the steam inlet of the low-temperature reheater is connected to the steam outlet of the reheating cold section, and the steam outlet of the low-temperature reheater is connected to the steam inlet of the high-temperature reheater; the steam outlet of the high-temperature reheater is connected to the low-pressure cylinder of the steam turbine through the reheating hot section; the steam outlet of the superheater is connected to the high-pressure cylinder of the steam turbine through the superheating pipe.
5. A condensing steam generator set heating system according to claim 1, characterized in that: A steam extraction interface is provided on the reheat cold section, and the steam inlet of the steam extraction pipeline is connected to the steam extraction interface.
6. A condensing steam generator set heating system according to claim 4, characterized in that: A condensate pipe is provided between the steam turbine and the power station boiler.