A combined production system three-stage steam extraction heat supply device

Abstract

The utility model discloses a kind of cogeneration system three-stage steam extraction heat supply device, it is related to the field of cogeneration, including boiler, superheated steam pipe, steam turbine, first-stage air extraction unit, second-stage air extraction unit and three-stage air extraction unit, superheater is arranged in boiler, the gas outlet end of superheater is connected with the steam inlet of steam turbine by superheated steam pipe, pressure sensor one and temperature sensor one are installed on superheated steam pipe, the utility model directly extracts high-temperature steam from superheated steam pipe by first-stage air extraction unit, after high-temperature heat exchanger, it is supplied to industrial high-temperature heat equipment, avoid the waste of high-grade heat energy for low-grade heat demand;Second-stage air extraction unit obtains steam from steam turbine medium-temperature air extraction port, after heat exchange by medium-temperature heat exchanger, most of the demand of central heating pipe network can be satisfied;Three-stage air extraction unit extracts low-temperature steam, is specially used for life heating pipe network, realizes the accurate matching of steam grade and different heat scenes, significantly improves the comprehensive utilization efficiency of energy.

Description

Technical Field

[0001] This utility model belongs to the field of cogeneration, specifically relating to a three-stage steam extraction heating device for a cogeneration system. Background Technology

[0002] In the fields of energy utilization and industrial production, combined heat and power (CHP) systems are a highly efficient way to utilize energy. They can simultaneously produce electricity and heat, significantly improving the overall efficiency of energy utilization and reducing energy waste and environmental pollution compared to traditional separate production methods.

[0003] Traditional combined heat and power (CHP) systems have achieved, to some extent, the cascade utilization of energy. However, with the diversification of industrial heat consumption and the increasing demand for district heating, existing systems still face the following technical bottlenecks in terms of cascaded heat utilization, heating flexibility, and stability:

[0004] Insufficient matching of steam grade: Industrial high-temperature heat use (such as chemical and metallurgical industries) usually requires steam with higher parameters, while domestic heating requires low-temperature heat energy. Traditional systems have difficulty in achieving precise extraction and distribution of steam of different grades, resulting in waste of high-grade heat energy or insufficient supply of low-grade heat energy.

[0005] Poor heating stability: Medium and low temperature heating ends (such as centralized heating networks) are easily affected by fluctuations in heat load. Existing heat storage devices mostly operate independently and lack a dynamic linkage mechanism with the steam extraction system, resulting in unstable heating temperature or pressure.

[0006] Therefore, we propose a three-stage steam extraction heating device for a combined heat and power system to solve the above problems. Utility Model Content

[0007] In view of the shortcomings of existing cogeneration systems in terms of cascade utilization of heat energy, heating flexibility and stability, this utility model provides a three-stage steam extraction heating device for cogeneration systems.

[0008] The solution adopted by this utility model to solve its technical problem is: a three-stage steam extraction heating device for a cogeneration system, including a boiler, a superheated steam pipe, a steam turbine, a first-stage extraction unit, a second-stage extraction unit, and a third-stage extraction unit. A superheater is installed inside the boiler, and the outlet of the superheater is connected to the steam inlet of the steam turbine through a superheated steam pipe. A pressure sensor and a temperature sensor are installed on the superheated steam pipe.

[0009] The primary extraction unit includes a high-temperature heat exchanger and a high-temperature extraction valve. The high-temperature extraction valve is installed on the high-temperature extraction port of the superheated steam pipe. A high-temperature extraction pipe is installed between the inlet of the high-temperature heat exchanger and the high-temperature extraction valve. The outlet of the high-temperature heat exchanger is connected to industrial high-temperature heat-using equipment through a medium outlet pipe.

[0010] The secondary extraction unit includes a medium-temperature extraction check valve, a medium-temperature heat exchanger, and a heat accumulator. The medium-temperature extraction check valve is installed on the medium-temperature extraction port of the steam turbine. A medium-temperature extraction pipe is installed between the inlet of the medium-temperature heat exchanger and the medium-temperature extraction check valve. The liquid outlet pipe of the medium-temperature heat exchanger is connected to the centralized heating network.

[0011] A connecting pipe is installed between the medium-temperature extraction pipe and the main air inlet of the accumulator. The accumulator is equipped with pressure sensor three and temperature sensor two.

[0012] The three-stage extraction unit includes a low-temperature extraction check valve and a low-temperature heat exchanger. The low-temperature extraction check valve is installed on the low-temperature extraction port of the steam turbine. A low-temperature extraction pipe is installed between the inlet of the low-temperature heat exchanger and the low-temperature extraction check valve. The outlet pipe of the low-temperature heat exchanger is connected to the domestic heating network.

[0013] Pressure sensors are installed on the high-temperature extraction pipe, the medium-temperature extraction pipe, and the low-temperature extraction pipe, respectively.

[0014] Preferably, the high-temperature heat exchanger is a plate heat exchanger.

[0015] Preferably, the medium-temperature heat exchanger and the low-temperature heat exchanger are shell-and-tube heat exchangers.

[0016] Preferably, it also includes a temperature regulating pipe, the two ends of which are connected to the superheated steam pipe and the auxiliary air inlet of the accumulator, respectively, and a solenoid valve is provided on the temperature regulating pipe.

[0017] Preferably, a diversion pipe is installed between the medium-temperature extraction pipe and the low-temperature extraction pipe, and a second solenoid valve is installed on the diversion pipe.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model directly extracts high-temperature steam from superheated steam pipes through a primary extraction unit, and supplies it to industrial high-temperature heat-using equipment after passing through a high-temperature heat exchanger, avoiding the waste of high-grade heat energy used for low-grade heat demand; the secondary extraction unit obtains steam from the intermediate-temperature extraction port of the steam turbine, and after heat exchange through an intermediate-temperature heat exchanger, it can meet most of the needs of the centralized heating network; the tertiary extraction unit extracts low-temperature steam, which is specifically used for domestic heating networks, realizing precise matching of steam grade with different heat use scenarios, and significantly improving the comprehensive utilization efficiency of energy.

[0020] 2. By setting up a temperature regulating pipe and a solenoid valve, when the heat accumulator needs to be quickly replenished, the solenoid valve can be opened to introduce high-temperature steam from the superheated steam pipe into the heat accumulator, thereby regulating the steam temperature and pressure in the heat accumulator, making it better suited to the needs of the centralized heating network, and enhancing the system's ability to cope with sudden demands.

[0021] 3. By installing a diversion pipe between the medium-temperature extraction pipe and the low-temperature extraction pipe, this utility model can flexibly distribute medium- and low-temperature steam according to actual needs, further enhancing the heating system's ability to cope with heat load fluctuations and ensuring the stability of heating temperature and pressure. Attached Figure Description

[0022] Figure 1 This is a front view structural diagram of the present utility model.

[0023] In the diagram: 1 Boiler, 2 Superheater, 3 Superheated Steam Pipe, 31 Pressure Sensor I, 32 Temperature Sensor I, 41 High-Temperature Extraction Valve, 42 High-Temperature Extraction Pipe, 43 High-Temperature Heat Exchanger, 44 Medium Outlet Pipe, 45 Industrial High-Temperature Heat Equipment, 51 Solenoid Valve I, 52 Temperature Control Pipe, 6 Steam Turbine, 71 Medium-Temperature Extraction Check Valve, 72 Connecting Pipe, 73 Medium-Temperature Extraction Pipe, 74 Medium-Temperature Heat Exchanger, 75 Heat Accumulator, 76 Central Heating Network, 77 Makeup Pipe, 81 Low-Temperature Extraction Check Valve, 82 Low-Temperature Extraction Pipe, 83 Low-Temperature Heat Exchanger, 84 Domestic Heating Network, 91 Solenoid Valve II, 93 Diverter Pipe, 10 Pressure Sensor II. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please see Figure 1 This utility model provides a technical solution for a three-stage steam extraction heating device in a cogeneration system:

[0026] Example 1:

[0027] according to Figure 1 As shown, the system includes a boiler 1, a superheated steam pipe 3, a steam turbine 6, a primary extraction unit, a secondary extraction unit, and a tertiary extraction unit. The boiler 1 is equipped with a superheater 2. The outlet of the superheater 2 is connected to the steam inlet of the steam turbine 6 through the superheated steam pipe 3. The superheated steam pipe 3 is equipped with a pressure sensor 31 and a temperature sensor 32. The pressure sensor 31 monitors the pressure inside the superheated steam pipe 3 in real time, and the temperature sensor 32 monitors the temperature inside the superheated steam pipe 3 in real time.

[0028] The primary extraction unit includes a high-temperature heat exchanger 43 and a high-temperature extraction valve 41. The high-temperature extraction valve 41 is installed on the high-temperature extraction port of the superheated steam pipe 3. A high-temperature extraction pipe 42 is installed between the inlet of the high-temperature heat exchanger 43 and the high-temperature extraction valve 41. The outlet of the high-temperature heat exchanger 43 is connected to the industrial high-temperature heat-using equipment 45 through the medium outlet pipe 44, thus avoiding the waste of high-grade heat energy for low-grade heat demand.

[0029] The secondary extraction unit includes a medium-temperature extraction check valve 71, a medium-temperature heat exchanger 74, and a heat accumulator 75. The medium-temperature extraction check valve 71 is installed on the medium-temperature extraction port of the steam turbine 6. A medium-temperature extraction pipe 73 is installed between the inlet of the medium-temperature heat exchanger 74 and the medium-temperature extraction check valve 71. The liquid outlet pipe of the medium-temperature heat exchanger 73 is connected to the centralized heating network 76, which can meet most of the needs of the centralized heating network 76.

[0030] A connecting pipe 72 is installed between the medium-temperature extraction pipe 73 and the main air inlet of the heat accumulator 75. The heat accumulator 75 can store excess heat. The heat accumulator 75 is equipped with a pressure sensor 3 and a temperature sensor 2, which monitor the status of the heat accumulator 75 in real time.

[0031] The three-stage extraction unit includes a low-temperature extraction check valve 81 and a low-temperature heat exchanger 83. The low-temperature extraction check valve 81 is installed on the low-temperature extraction port of the steam turbine 6. A low-temperature extraction pipe 82 is installed between the inlet of the low-temperature heat exchanger 83 and the low-temperature extraction check valve 81. The liquid outlet pipe of the low-temperature heat exchanger 83 is connected to the domestic heating network 84, thereby achieving precise matching of steam grade with different heating scenarios and significantly improving the comprehensive energy utilization efficiency.

[0032] Pressure sensors 10 are installed on the high-temperature extraction pipe 42, the medium-temperature extraction pipe 73, and the low-temperature extraction pipe 82 respectively. A diversion pipe 93 is installed between the medium-temperature extraction pipe 73 and the low-temperature extraction pipe 82. A solenoid valve 91 is installed on the diversion pipe 93. By opening and closing the solenoid valve 91, the medium and low-temperature steam can be flexibly distributed according to actual needs, which further enhances the heating system's ability to cope with heat load fluctuations and ensures the stability of heating temperature and pressure.

[0033] It also includes a temperature regulating pipe 52, with its two ends connected to the superheated steam pipe 3 and the auxiliary air inlet of the heat accumulator 75, respectively. The temperature regulating pipe 52 is equipped with a solenoid valve 51. When the heat accumulator 75 needs to be quickly reheated, the solenoid valve 51 can be opened to introduce the high-temperature steam in the superheated steam pipe 3 into the heat accumulator 75, thereby regulating the steam temperature and pressure in the heat accumulator 75, so that it can better adapt to the needs of the centralized heating network 76 and enhance the system's ability to cope with sudden demands.

[0034] Example 2:

[0035] Based on Example 1, the differences are as follows: the high-temperature heat exchanger 43 adopts a plate heat exchanger, while the medium-temperature heat exchanger 74 and the low-temperature heat exchanger 83 adopt shell-and-tube heat exchangers.

Claims

1. A three-stage extraction steam heating device for a cogeneration system, comprising a boiler, a superheated steam pipe, a steam turbine, a primary extraction unit, a secondary extraction unit, and a tertiary extraction unit, wherein a superheater is installed in the boiler, the outlet of the superheater is connected to the steam inlet of the steam turbine via a superheated steam pipe, and a pressure sensor and a temperature sensor are installed on the superheated steam pipe, characterized in that: The primary extraction unit includes a high-temperature heat exchanger and a high-temperature extraction valve. The high-temperature extraction valve is installed on the high-temperature extraction port of the superheated steam pipe. A high-temperature extraction pipe is installed between the inlet of the high-temperature heat exchanger and the high-temperature extraction valve. The outlet of the high-temperature heat exchanger is connected to industrial high-temperature heat-using equipment through a medium outlet pipe. The secondary extraction unit includes a medium-temperature extraction check valve, a medium-temperature heat exchanger, and a heat accumulator. The medium-temperature extraction check valve is installed on the medium-temperature extraction port of the steam turbine. A medium-temperature extraction pipe is installed between the inlet of the medium-temperature heat exchanger and the medium-temperature extraction check valve. The liquid outlet pipe of the medium-temperature heat exchanger is connected to the centralized heating network. A connecting pipe is installed between the medium-temperature extraction pipe and the main air inlet of the accumulator. The accumulator is equipped with pressure sensor three and temperature sensor two. The three-stage extraction unit includes a low-temperature extraction check valve and a low-temperature heat exchanger. The low-temperature extraction check valve is installed on the low-temperature extraction port of the steam turbine. A low-temperature extraction pipe is installed between the inlet of the low-temperature heat exchanger and the low-temperature extraction check valve. The outlet pipe of the low-temperature heat exchanger is connected to the domestic heating network. Pressure sensors are installed on the high-temperature extraction pipe, the medium-temperature extraction pipe, and the low-temperature extraction pipe, respectively.

2. The three-stage steam extraction heating device for a combined heat and power system according to claim 1, characterized in that: The high-temperature heat exchanger is a plate heat exchanger.

3. The three-stage steam extraction heating device for a combined heat and power system according to claim 1, characterized in that: The medium-temperature heat exchanger and the low-temperature heat exchanger are shell-and-tube heat exchangers.

4. The three-stage steam extraction heating device for a combined heat and power system according to claim 1, characterized in that: It also includes a temperature control pipe, the two ends of which are connected to the superheated steam pipe and the auxiliary air inlet of the accumulator, respectively. A solenoid valve is installed on the temperature control pipe.

5. The three-stage steam extraction heating device for a combined heat and power system according to claim 1, characterized in that: A diversion pipe is installed between the medium-temperature extraction pipe and the low-temperature extraction pipe, and a second solenoid valve is installed on the diversion pipe.

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