A steam turbine steam flooding waste heat recycling device

Abstract

This invention discloses a turbine exhaust heat recovery device, comprising a main body assembly including a heat exchanger heater, a first condenser, and a second condenser. The invention delivers the heat exchanger water to the heat exchanger water heat exchange sleeve of the second condenser via a mixing pipe. The heat exchanger water then uses the heat carried by the turbine exhaust steam and the exhaust gas from the heat exchanger heater in the second condenser to initially preheat the heat exchanger water. The first condenser then uses the heat carried by the turbine exhaust steam to preheat the heat exchanger water a second time. Finally, the heat exchanger heater uses steam to preheat the heat exchanger water a third time. This allows for the use of the heat carried by the turbine exhaust steam and the exhaust gas from the heat exchanger heater to preheat the heat exchanger water, improving heat exchange efficiency, reducing the amount of high-quality steam used by the heat exchanger heater, and increasing the utilization rate of the turbine exhaust steam heat energy.

Description

Technical fields:

[0001] This invention relates to a waste heat recovery device, specifically a steam turbine waste heat recovery device, belonging to the field of thermal power generation technology. Background technology:

[0002] Thermal power generation utilizes the heat energy generated during the combustion of combustible materials, converting it into electrical energy through a power generation device. In thermal power plants, a portion of the exhaust steam from the intermediate-pressure cylinder passes through a heating extraction regulating valve and enters the heating network heater to heat the circulating water. The remaining exhaust steam from the intermediate-pressure cylinder enters the low-pressure cylinder to perform work, then passes through the condenser, main unit circulating water, and indirect cooling tower, releasing most of the heat to the atmosphere. During the heating season, to ensure adequate heating, the power plant adjusts the supply water temperature by regulating the extraction steam flow and pressure using the heating extraction regulating valve, thus controlling the quality of the heating network. To meet heating demand, the power load of the thermal power unit during the heating season is generally no less than 60%. The cold-end loss of a thermal power plant is the largest energy loss in the plant's thermal system; a large amount of waste heat from the turbine condenser is released into the atmosphere through various cooling devices. Under winter operating conditions, the condensation heat loss from the turbine exhaust steam can account for 50-60% of the total calorific value of the fuel.

[0003] Traditional cogeneration units in thermal power plants typically only use the heating network heater to heat the circulating water of the heating network in a primary heating manner. This has disadvantages such as low heat exchange efficiency and large consumption of high-quality steam. In addition, the steam from the turbine carries a large amount of heat energy, and direct discharge would result in resource waste. Therefore, a steam turbine waste heat recovery device is proposed. Summary of the Invention:

[0004] The purpose of this invention is to provide a steam turbine waste heat recovery device to solve one of the problems mentioned in the background art.

[0005] This invention is implemented by the following technical solution: a steam turbine waste heat recovery device, comprising...

[0006] The machine body assembly includes a heating network heater, a first condenser, and a second condenser;

[0007] A cascaded recycling mechanism, comprising a mixing pipe, two heating network water heat exchange sleeves, a water supply pipe, a heating water supply pipe, a heating drain pipe, and an electric valve;

[0008] The first condenser is located on one side of the heat network heater, and the second condenser is located on the side of the first condenser away from the heat network heater. Two heat network water heat exchange sleeves are respectively fixedly connected to the middle of the inner sidewalls of the first condenser and the second condenser. The mixing pipe is connected to the inlet of one of the heat network water heat exchange sleeves. One end of the water supply pipe is connected to the outlet of one of the heat network water heat exchange sleeves, and the other end of the water supply pipe is connected to the inlet of the other heat network water heat exchange sleeve. One side of the heating water supply pipe is connected to the outlet of the other heat network water heat exchange sleeve, and the other end of the heating water supply pipe is connected to the interior of the heat network heater. A heating drain pipe is connected to the side of the heat network heater away from the heating water supply pipe. The electric valve is located at the end of the heat network heater away from the heating water supply pipe.

[0009] As a further preferred embodiment of this technical solution: the end of the electric valve away from the heating network heater is connected to a steam delivery pipe, the end of the electric valve away from the steam delivery pipe is connected to a flow meter, and the end of the flow meter away from the electric valve is connected to the air inlet of the heating network heater.

[0010] As a further preferred embodiment of this technical solution: two heat network water collection trays are symmetrically fixedly connected to the inner side wall of the heat network heater, one end of the heating water supply pipe is connected to the top of the outer side wall of one of the heat network water collection trays, and one end of the heating drain pipe is connected to the top of the outer side wall of the other heat network water collection tray.

[0011] As a further preferred embodiment of this technical solution: a heat exchanger pipe is uniformly connected to one side of each of the two adjacent heat network water collection trays, and a baffle plate is uniformly fixedly connected to the inner and outer walls of the heat exchanger pipe.

[0012] As a further preferred embodiment of this technical solution: the exhaust port of the heat network heater is connected to a gas guide pipe, the end of the gas guide pipe away from the heat network heater is connected to a waste steam pipe, and one end of the waste steam pipe is connected to the air inlet of the second condenser.

[0013] As a further preferred embodiment of this technical solution: thermometers are installed on the top of the outer walls of both the heating water supply pipe and the heating drain pipe, and an electrical control box is fixedly connected to the middle of the outer wall of the heating network heater.

[0014] As a further preferred embodiment of this technical solution: a PLC controller is installed on the top of the inner wall of the electrical control box, and relays are evenly installed on the bottom of the inner wall of the electrical control box.

[0015] As a further preferred embodiment of this technical solution: the inner walls of the first condenser and the second condenser are symmetrically and fixedly connected to two circulating water collection trays. One side of one of the circulating water collection trays is symmetrically connected to two circulating water supply pipes, and one side of the other circulating water collection tray is symmetrically connected to two circulating drain pipes. The adjacent sides of the two circulating water collection trays are uniformly connected to circulating water heat exchange pipes.

[0016] As a further preferred embodiment of this technical solution: the exhaust ports of the first condenser and the second condenser are both connected to exhaust pipes, the inner walls of the two heat exchanger sleeves are fixedly connected to heat exchanger partition plates, and the inner walls of the mixing pipe are fixedly connected to auger plates.

[0017] As a further preferred embodiment of this technical solution: the signal output terminals of the thermometer and flowmeter are electrically connected to the signal input terminal of the PLC controller via wires, the electrical output terminal of the PLC controller is electrically connected to the electrical input terminal of the relay via wires, and the electrical output terminal of the relay is electrically connected to the electrical input terminal of the electric valve via wires.

[0018] Advantages of this invention: This invention delivers the circulating return water of the heating network to the heating network water heat exchange sleeve of the second condenser via a mixing pipe. Then, the heating network water heat exchange sleeve utilizes the heat carried by the turbine steam and the exhaust gas of the heating network heater in the second condenser to perform preliminary heating treatment on the circulating return water. Then, the first condenser uses the heat carried by the turbine steam to perform secondary heating treatment on the circulating return water. Finally, the heating network heater uses steam to perform a third heating treatment on the circulating return water. Thus, the heat carried by the turbine steam and the exhaust gas of the heating network heater can be used to preheat the circulating return water, improving heat exchange efficiency, reducing the amount of high-quality steam used by the heating network heater, and increasing the utilization rate of the turbine steam thermal energy. Attached image description:

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a side view of the structure of the present invention;

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 4 This is a cross-sectional view of the second condenser of the present invention;

[0024] Figure 5 This is a cross-sectional structural schematic diagram of the heating network heater of the present invention;

[0025] Figure 6 This is a cross-sectional view of the electrical control box of the present invention.

[0026] In the diagram: 1. Main body components; 2. Cascaded recycling mechanism; 101. Heat network heater; 102. First condenser; 103. Second condenser; 201. Mixing pipe; 202. Heat network water heat exchange sleeve; 203. Water supply pipe; 204. Heating water supply pipe; 205. Heating drain pipe; 206. Electric valve; 41. Steam delivery pipe; 42. Flow meter; 43. Heat network water collection tray; 44. Heat network water heat exchange pipe; 45. Baffle plate; 46. Air guide pipe; 47. Thermometer; 48. Electrical control box; 49. PLC controller; 50. Relay; 51. Exhaust steam pipe; 52. Circulating water supply pipe; 53. Circulating drain pipe; 54. Exhaust pipe; 55. Circulating water collection tray; 56. Circulating water heat exchange pipe; 57. Heat network water partition plate; 58. Screwdriver plate. Detailed implementation method:

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example

[0029] Please see Figure 1-6 This invention provides a technical solution: a steam turbine waste heat recovery device, comprising...

[0030] The machine body assembly 1 includes a heat network heater 101, a first condenser 102, and a second condenser 103;

[0031] The cascade recycling mechanism 2 includes a mixing pipe 201, two heating network water heat exchange jackets 202, a water supply pipe 203, a heating water supply pipe 204, a heating drain pipe 205, and an electric valve 206.

[0032] The first condenser 102 is located on one side of the heat network heater 101, and the second condenser 103 is located on the side of the first condenser 102 away from the heat network heater 101. Two heat network water heat exchange sleeves 202 are respectively fixedly connected to the middle of the inner sidewalls of the first condenser 102 and the second condenser 103. A mixing pipe 201 is connected to the inlet of one heat network water heat exchange sleeve 202, and one end of a water supply pipe 203 is connected to the outlet of one heat network water heat exchange sleeve 202. The other end of the water pipe 203 is connected to the inlet of another heating network water heat exchange sleeve 202. One side of the heating water supply pipe 204 is connected to the outlet of another heating network water heat exchange sleeve 202. The other end of the heating water supply pipe 204 is connected to the interior of the heating network heater 101. The side of the heating network heater 101 away from the heating water supply pipe 204 is connected to the heating drain pipe 205. The electric valve 206 is located at the end of the heating network heater 101 away from the heating water supply pipe 204.

[0033] In this embodiment, specifically: two hot network water collection trays 43 are symmetrically fixedly connected to the inner side wall of the hot network heater 101; one end of the heating water supply pipe 204 is connected to the top of the outer side wall of one hot network water collection tray 43; one end of the heating drain pipe 205 is connected to the top of the outer side wall of the other hot network water collection tray 43; and the hot network circulating water is guided into the other hot network water collection tray 43 through the hot network water heat exchange pipe 44.

[0034] In this embodiment, specifically: a heat exchange pipe 44 is uniformly connected to one side of two adjacent heat network water collection trays 43, and a baffle plate 45 is uniformly fixedly connected to the inner and outer walls of the heat exchange pipe 44; the baffle plate 45 blocks the steam in the heat network heater 101, thereby changing the direction of steam movement, thereby increasing the residence time of steam in the heat network heater 101 and improving the heat exchange efficiency.

[0035] In this embodiment, specifically: the exhaust port of the heat network heater 101 is connected to a guide pipe 46, the end of the guide pipe 46 away from the heat network heater 101 is connected to a waste steam pipe 51, and the end of the waste steam pipe 51 is connected to the air inlet of the second condenser 103; the turbine steam and the exhaust gas of the heat network heater 101 are discharged into the interior of the heat network water heat exchange sleeve 202 inside the second condenser 103 through the waste steam pipe 51.

[0036] In this embodiment, specifically: the inner walls of the first condenser 102 and the second condenser 103 are symmetrically fixedly connected to two circulating water collection trays 55. One side of one circulating water collection tray 55 is symmetrically connected to two circulating water supply pipes 52, and one side of the other circulating water collection tray 55 is symmetrically connected to two circulating drain pipes 53. The adjacent sides of the two circulating water collection trays 55 are uniformly connected to circulating water heat exchange pipes 56. The circulating cooling water in the circulating water collection tray 55 is introduced into the other circulating water collection tray 55 through the circulating water heat exchange pipes 56, so that the exhaust steam after heat exchange in the first condenser 102 or the second condenser 103 can be condensed by the circulating cooling water through the circulating water heat exchange pipes 56.

[0037] In this embodiment, specifically: the exhaust ports of the first condenser 102 and the second condenser 103 are both connected to exhaust pipes 54, and the inner side walls of the two heat exchanger pipes 202 are fixedly connected to heat exchanger water partition plates 57, and the inner side walls of the mixing pipe 201 are fixedly connected to auger plates 58; the auger plates 58 cause the bolts of the heat exchanger circulating return water to move inside the mixing pipe 201, so as to mix the heat exchanger circulating return water of the first and second phases.

[0038] In this embodiment, specifically: the end of the electric valve 206 away from the heat network heater 101 is connected to a steam delivery pipe 41; the end of the electric valve 206 away from the steam delivery pipe 41 is connected to a flow meter 42; the end of the flow meter 42 away from the electric valve 206 is connected to the air inlet of the heat network heater 101; a PLC controller 49 is installed on the top of the inner wall of the electrical control box 48; thermometers 47 are installed on the top of the outer walls of the heating water supply pipe 204 and the heating drain pipe 205; and the electrical control box 48 is fixedly connected to the middle of the outer wall of the heat network heater 101. Relays 50 are evenly installed on the bottom of the inner wall of valve 8. The signal output terminals of thermometer 47 and flow meter 42 are electrically connected to the signal input terminal of PLC controller 49 through wires. The electrical output terminal of PLC controller 49 is electrically connected to the electrical input terminal of relay 50 through wires. The electrical output terminal of relay 50 is electrically connected to the electrical input terminal of electric valve 206 through wires. PLC controller 49 receives data from thermometer 47 and flow meter 42, and controls the opening range of electric valve 206 by using relay 50.

[0039] In this embodiment, specifically: the thermometer 47 is model D6T-1A-01; the flow meter 42 is model LWGY-FMT1; and the PLC controller 49 is model DF-96D.

[0040] Working principle or structural principle: During use, the exhaust gas of the heat network heater 101 is discharged into the exhaust steam pipe 51 through the gas guide pipe 46. Then, the turbine steam and the exhaust gas of the heat network heater 101 are discharged into the heat network water heat exchange sleeve 202 inside the second condenser 103 through the exhaust steam pipe 51. At the same time, the circulating return water of the first and second phase heat network is introduced into the mixing pipe 201. The circulating return water of the heat network is then guided through the mixing pipe 201. Then, the bolts inside the mixing pipe 201 are moved by the auger plate 58 to mix the circulating return water of the first and second phase heat network. Then, the mixed circulating return water of the heat network is introduced into the heat network water heat exchange sleeve 202 through the mixing pipe 201. Then, the heat network water heat exchange sleeve 202 is used to... The turbine exhaust steam in the second condenser 103 and the exhaust gas from the heat network heater 101 exchange heat with the heat network circulating return water to perform preliminary heating treatment. A heat network water separator 57 separates the heat network circulating return water that has absorbed heat from the unheated water in the heat network water heat exchange sleeve 202. Then, the pre-heated heat network circulating return water in the heat network water heat exchange sleeve 202 is introduced into the heat network water heat exchange sleeve 202 of the first condenser 102 through the water supply pipe 203. The heat network circulating return water then undergoes a second heat exchange with the turbine exhaust steam in the first condenser 102 through the heat network water heat exchange sleeve 202 to perform secondary heating treatment. Finally, the water in the first condenser 102 is heated again through the heating water supply pipe 204. The treated circulating water from the heating network is introduced into a heating network water collection tray 43, and then guided to another heating network water collection tray 43 via a heating network water heat exchange pipe 44. Simultaneously, steam is introduced into the heating network heater 101 via a steam delivery pipe 41. A baffle plate 45 blocks the steam in the heating network heater 101, changing its direction of movement and increasing its residence time, thus improving heat exchange efficiency. The high-temperature steam in the heating network heater 101 then heats the circulating water three times via the heating network water heat exchange pipe 44, bringing it to the required heating temperature. Finally, the circulating water is discharged through a heated drain pipe 205, and then monitored by a flow meter 42. Steam flow data is monitored. Thermometer 47 detects the heat data of the circulating water in the heating network return water within the heating supply pipe 204 and heating drain pipe 205. The PLC controller 49 receives the data from the flow meter 42 and thermometer 47. Based on the temperature of the circulating water before entering the heating network heater 101 and the temperature after exiting, the PLC controller 49 calculates the required amount of steam for the heating network heater 101. When the temperature detected by thermometer 47 before entering the heating network heater 101 or the temperature after exiting the heater exceeds a threshold, the PLC controller 49 uses relay 50 to control the electric valve 206 to reduce the opening degree of the steam delivery pipe 41, thereby reducing the steam flow rate within the steam delivery pipe 41.This reduces the steam consumption of the heating network heater 101. When the temperature of the circulating water before entering the heating network heater 101, as detected by the thermometer 47, is lower than the threshold, the PLC controller 49 uses the relay 50 to control the electric valve 206 to increase the opening of the steam delivery pipe 41, thereby increasing the steam flow rate in the steam delivery pipe 41. This ensures the heating demand of the circulating water in the heating network. Furthermore, the heat carried by the turbine steam and the exhaust gas of the heating network heater 101 can be used to preheat the circulating water, improving heat exchange efficiency and reducing the amount of high-quality steam used by the heating network heater 101. Furthermore, it increases the utilization rate of steam turbine heat energy. Circulating cooling water is injected into a circulating water collection basin 55 via a circulating water supply pipe 52. Then, the circulating cooling water in the circulating water collection basin 55 is diverted to another circulating water collection basin 55 via a circulating water heat exchange pipe 56. This allows the circulating cooling water to condense the exhaust steam after heat exchange in the first condenser 102 or the second condenser 103. The used circulating cooling water is then discharged through a circulating drain pipe 53, and the condensed exhaust steam from the first condenser 102 or the second condenser 103 is discharged through an exhaust pipe 54.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steam turbine waste heat recovery device, characterized in that, include The machine body assembly (1) includes a heat network heater (101), a first condenser (102), and a second condenser (103). The cascade recycling mechanism (2) includes a mixing pipe (201), two heat exchange sleeves for the heating network (202), a water supply pipe (203), a heating water supply pipe (204), a heating drain pipe (205), and an electric valve (206). The first condenser (102) is located on one side of the heat network heater (101), and the second condenser (103) is located on the side of the first condenser (102) away from the heat network heater (101). Two heat network water heat exchange sleeves (202) are respectively fixedly connected to the middle of the inner walls of the first condenser (102) and the second condenser (103). The mixing pipe (201) is connected to the inlet of one heat network water heat exchange sleeve (202). One end of the water supply pipe (203) is connected to the outlet of one heat network water heat exchange sleeve (202), and the other end of the water supply pipe (203) is connected to the inlet of the other heat network water heat exchange sleeve (202). The heating water supply pipe (… One side of the heating water supply pipe (204) is connected to the drain outlet of another heating network water heat exchange sleeve (202), and the other end of the heating water supply pipe (204) is connected to the interior of the heating network heater (101). The side of the heating network heater (101) away from the heating water supply pipe (204) is connected to the heating drain pipe (205). The electric valve (206) is located at the end of the heating network heater (101) away from the heating water supply pipe (204). The exhaust port of the heating network heater (101) is connected to the air guide pipe (46). The end of the air guide pipe (46) away from the heating network heater (101) is connected to the exhaust steam pipe (51). One end of the exhaust steam pipe (51) is connected to the air inlet of the second condenser (103).

2. The steam turbine waste heat recovery device according to claim 1, characterized in that: The electric valve (206) is connected to a steam delivery pipe (41) at one end away from the heat network heater (101), and a flow meter (42) is connected to the other end of the electric valve (206) away from the steam delivery pipe (41). The flow meter (42) is connected to the air inlet of the heat network heater (101) at one end away from the electric valve (206).

3. The steam turbine waste heat recovery device according to claim 1, characterized in that: The inner wall of the heating network heater (101) is symmetrically fixed with two heating network water collection trays (43). One end of the heating water supply pipe (204) is connected to the top of the outer wall of one of the heating network water collection trays (43), and one end of the heating drain pipe (205) is connected to the top of the outer wall of the other heating network water collection tray (43).

4. A steam turbine waste heat recovery device according to claim 3, characterized in that: The two adjacent sides of the heat network water collection trays (43) are uniformly connected to heat network water heat exchange pipes (44), and the inner and outer walls of the heat network water heat exchange pipes (44) are uniformly fixedly connected to baffle plates (45).

5. A steam turbine waste heat recovery device according to claim 2, characterized in that: Thermometers (47) are installed on the top of the outer walls of the heating water supply pipe (204) and the heating drain pipe (205), and an electrical control box (48) is fixedly connected to the middle of the outer wall of the heating network heater (101).

6. A steam turbine waste heat recovery device according to claim 5, characterized in that: A PLC controller (49) is installed on the top of the inner wall of the electrical control box (48), and relays (50) are evenly installed on the bottom of the inner wall of the electrical control box (48).

7. A steam turbine waste heat recovery device according to claim 1, characterized in that: The inner walls of the first condenser (102) and the second condenser (103) are symmetrically fixed with two circulating water collection trays (55). One side of one of the circulating water collection trays (55) is symmetrically connected with two circulating water supply pipes (52), and one side of the other circulating water collection tray (55) is symmetrically connected with two circulating drain pipes (53). The two circulating water collection trays (55) are evenly connected with circulating water heat exchange pipes (56) on adjacent sides.

8. A steam turbine waste heat recovery device according to claim 1, characterized in that: The exhaust ports of the first condenser (102) and the second condenser (103) are both connected to exhaust pipes (54), and the inner walls of the two heat exchanger sleeves (202) are fixedly connected to heat exchanger partition plates (57), and the inner walls of the mixing pipe (201) are fixedly connected to screw conveyors (58).

9. A steam turbine waste heat recovery device according to claim 6, characterized in that: The signal output terminals of the thermometer (47) and the flow meter (42) are electrically connected to the signal input terminal of the PLC controller (49) via wires. The electrical output terminal of the PLC controller (49) is electrically connected to the electrical input terminal of the relay (50) via wires. The electrical output terminal of the relay (50) is electrically connected to the electrical input terminal of the electric valve (206) via wires.

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