An industrial steam supply system based on steam heat source

Abstract

The present disclosure proposes an industrial steam supply system based on a steam heat source, comprising: a first heat exchanger, wherein the hot-side steam inlet of the first heat exchanger is connected to the main steam outlet of a cogeneration unit, the hot-side liquid outlet of the first heat exchanger is connected to the condensate outlet of the cogeneration unit, and the cold-side liquid inlet of the first heat exchanger is connected to the deoxygenated water outlet of the cogeneration unit; a second heat exchanger, wherein the hot-side steam inlet of the second heat exchanger is connected to the reheat steam outlet of the cogeneration unit, the hot-side steam outlet of the second heat exchanger is connected to the low-pressure steam inlet of the cogeneration unit, and the cold-side steam inlet of the second heat exchanger is connected to the cold-side steam outlet of the first heat exchanger. In the industrial steam supply system based on a steam heat source disclosed in the present disclosure, the steam supply capacity of the industrial steam supply system is greatly improved, ensuring that the industrial steam supply system can still provide stable steam when the main steam volume of the cogeneration unit is reduced, avoiding the influence of factors such as reheat overheating and deep peak regulation.

Description

Technical Field

[0001] The present disclosure relates to the technical field of industrial steam supply, and in particular to an industrial steam supply system based on a steam heat source. Background Art

[0002] High-temperature, high-pressure steam is a raw material required for production processes in many industries, especially the chemical and petroleum industries, which require high-pressure steam at temperatures exceeding 4 MPa. The conventional approach to producing high-temperature, high-pressure steam is for steam-consuming companies to build small-scale steam boilers to meet their needs. However, this approach, due to the large number of small-scale steam boilers, can easily cause air pollution. Furthermore, the low efficiency of these in-house steam boilers significantly increases production costs. Therefore, large-scale combined heat and power (CHP) units are required for centralized steam supply.

[0003] At present, cogeneration units usually use main steam for steam supply, but this method is easily restricted by boiler reheating overtemperature, resulting in a small steam supply. Moreover, when facing deep peak regulation, the steam supply capacity of the cogeneration unit will further decrease and cannot meet the steam demand. Summary of the Invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an object of the present disclosure is to provide an industrial steam supply system based on a steam heat source.

[0006] To achieve the above-mentioned objectives, the present disclosure provides an industrial steam supply system based on a steam heat source, comprising: a cogeneration unit; a first heat exchanger, wherein the hot-side steam inlet end of the first heat exchanger is connected to the main steam outlet end of the cogeneration unit, the hot-side liquid outlet end of the first heat exchanger is connected to the condensate outlet end of the cogeneration unit, and the cold-side liquid inlet end of the first heat exchanger is connected to the deoxygenated water outlet end of the cogeneration unit; a second heat exchanger, wherein the hot-side steam inlet end of the second heat exchanger is connected to the reheat steam outlet end of the cogeneration unit, the hot-side steam outlet end of the second heat exchanger is connected to the low-pressure steam inlet end of the cogeneration unit, the cold-side steam inlet end of the second heat exchanger is connected to the cold-side steam outlet end of the first heat exchanger, and the cold-side steam outlet end of the second heat exchanger is connected to the steam inlet end of the steam-consuming equipment.

[0007] Optionally, the industrial steam supply system also includes: a variable frequency booster pump, which is arranged between the cold side liquid inlet end of the first heat exchanger and the deoxygenated water liquid outlet end of the cogeneration unit, the liquid inlet end of the variable frequency booster pump is connected to the deoxygenated water liquid outlet end of the cogeneration unit, and the liquid outlet end of the variable frequency booster pump is connected to the cold side liquid inlet end of the first heat exchanger.

[0008] Optionally, the industrial steam supply system also includes: a first flow regulating valve, which is arranged between the liquid inlet end of the variable frequency booster pump and the deoxygenated water outlet end of the cogeneration unit, the liquid inlet end of the first flow regulating valve is connected to the deoxygenated water outlet end of the cogeneration unit, and the liquid outlet end of the first flow regulating valve is connected to the liquid inlet end of the variable frequency booster pump.

[0009] Optionally, the industrial steam supply system also includes: a second flow regulating valve, which is arranged between the cold side steam outlet end of the second heat exchanger and the steam inlet end of the steam-consuming equipment, the steam inlet end of the second flow regulating valve is connected to the cold side steam outlet end of the second heat exchanger, and the steam outlet end of the second flow regulating valve is connected to the steam inlet end of the steam-consuming equipment.

[0010] Optionally, the industrial steam supply system also includes: a third flow regulating valve, which is arranged between the hot side liquid outlet of the first heat exchanger and the condensate outlet of the cogeneration unit, the liquid inlet of the third flow regulating valve is connected to the hot side liquid outlet of the first heat exchanger, and the liquid outlet of the third flow regulating valve is connected to the condensate outlet of the cogeneration unit; a fourth flow regulating valve, which is arranged between the hot side steam outlet of the second heat exchanger and the low-pressure steam inlet of the cogeneration unit, the steam inlet of the fourth flow regulating valve is connected to the hot side steam outlet of the second heat exchanger, and the steam outlet of the fourth flow regulating valve is connected to the low-pressure steam inlet of the cogeneration unit.

[0011] Optionally, the industrial steam supply system also includes: a first switch valve, which is arranged between the hot side steam inlet end of the first heat exchanger and the main steam outlet end of the cogeneration unit, the steam inlet end of the first switch valve is connected to the main steam outlet end of the cogeneration unit, and the steam outlet end of the first switch valve is connected to the hot side steam inlet end of the first heat exchanger; a second switch valve, which is arranged between the hot side steam inlet end of the second heat exchanger and the reheat steam outlet end of the cogeneration unit, the steam inlet end of the second switch valve is connected to the reheat steam outlet end of the cogeneration unit, and the steam outlet end of the second switch valve is connected to the hot side steam inlet end of the second heat exchanger.

[0012] Optionally, the cogeneration unit includes: a boiler, the main steam outlet of the boiler is connected to the hot side steam inlet of the first heat exchanger, and the reheated steam outlet of the boiler is connected to the hot side steam inlet of the second heat exchanger; a high-pressure cylinder, the steam inlet of the high-pressure cylinder is connected to the main steam outlet of the boiler, and the steam outlet of the high-pressure cylinder is connected to the reheated steam inlet of the boiler; an intermediate-pressure cylinder, the steam inlet of the intermediate-pressure cylinder is connected to the reheated steam outlet of the boiler; and a low-pressure cylinder, the steam inlet of the low-pressure cylinder is connected to the steam outlet of the intermediate-pressure cylinder and the hot side steam outlet of the second heat exchanger.

[0013] Optionally, the cogeneration unit also includes: a condenser, the hot side steam inlet end of the condenser is connected to the steam outlet end of the low-pressure cylinder, and cooling water is passed into the cold side of the condenser; a deaerator, the liquid inlet end of the deaerator is connected to the hot side liquid outlet end of the condenser and the hot side liquid outlet end of the first heat exchanger, and the liquid outlet end of the deaerator is connected to the main steam liquid inlet end of the boiler and the cold side liquid inlet end of the first heat exchanger.

[0014] Optionally, the cogeneration unit further includes: a condensate pump, which is arranged between the liquid inlet end of the deaerator and the hot side liquid outlet end of the condenser, the liquid inlet end of the condenser is connected to the hot side liquid outlet end of the condenser, and the liquid outlet end of the condensate pump is connected to the liquid inlet end of the deaerator; a deaerator water pump, which is arranged between the liquid outlet end of the deaerator and the main steam liquid inlet end of the boiler, the liquid inlet end of the deaerator is connected to the liquid outlet end of the deaerator, and the liquid outlet end of the deaerator is connected to the main steam liquid inlet end of the boiler.

[0015] Optionally, the cogeneration unit further comprises: a high-pressure heater, wherein the hot side steam inlet end of the high-pressure heater is respectively connected to the steam outlet end of the high-pressure cylinder and the steam outlet end of the intermediate-pressure cylinder, the hot side steam outlet end of the high-pressure heater is connected to the steam inlet end of the deaerator, the cold side of the high-pressure heater is arranged between the liquid outlet end of the deaerator water pump and the main steam liquid inlet end of the boiler, the cold side liquid inlet end of the high-pressure heater is connected to the liquid outlet end of the deaerator water pump, and the cold side liquid outlet end of the high-pressure heater is connected to the boiler. a low-pressure heater, wherein the hot-side steam inlet end of the low-pressure heater is respectively connected to the steam outlet end of the intermediate-pressure cylinder and the steam outlet end of the low-pressure cylinder, the hot-side steam outlet end of the low-pressure heater is connected to the liquid inlet end of the condensate pump, and the cold side of the low-pressure heater is arranged between the liquid outlet end of the condensate pump and the liquid inlet end of the deaerator, the cold-side liquid inlet end of the low-pressure heater is connected to the liquid outlet end of the condensate pump, and the cold-side liquid outlet end of the low-pressure heater is connected to the liquid inlet end of the deaerator.

[0016] The technical solution provided by the present disclosure may have the following beneficial effects:

[0017] Part of the main steam of the cogeneration unit passes through the hot side of the first heat exchanger, and part of the reheated steam of the cogeneration unit passes through the hot side of the second heat exchanger. As a result, part of the deoxygenated water of the cogeneration unit is heated into saturated steam by the main steam on the hot side of the first heat exchanger when passing through the cold side of the first heat exchanger, and the saturated steam is heated into superheated steam by the reheated steam on the hot side of the second heat exchanger when passing through the cold side of the second heat exchanger. The superheated steam is supplied to steam-consuming equipment to realize centralized steam supply and meet usage needs.

[0018] Among them, by using the deoxygenated water of the cogeneration unit as the water source and the main steam and reheat steam of the cogeneration unit as the heat source, the steam supply capacity of the industrial steam supply system is greatly improved, ensuring that the industrial steam supply system can still supply steam stably when the main steam volume of the cogeneration unit is reduced, avoiding the influence of factors such as reheating overtemperature and deep peak regulation; the industrial steam supply system only has the first heat exchanger and the second heat exchanger on the cogeneration unit, which is easy to install and has low modification cost. It ensures the safe operation of the cogeneration unit while improving the steam supply capacity.

[0019] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a schematic structural diagram of an industrial steam supply system based on a steam heat source proposed in a related embodiment;

[0022] As shown in the figure: 1. Cogeneration unit, 2. First heat exchanger, 3. Second heat exchanger, 4. Variable frequency booster pump, 5. First flow regulating valve, 6. Second flow regulating valve, 7. Third flow regulating valve, 8. Fourth flow regulating valve, 9. First on-off valve, 10. Second on-off valve, 11. Boiler, 12. High-pressure cylinder, 13. Medium-pressure cylinder, 14. Low-pressure cylinder, 15. Condenser, 16. Deaerator, 17. Condensate pump, 18. Deaerator pump, 19. High-pressure heater, 20. Low-pressure heater. DETAILED DESCRIPTION

[0023] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the present disclosure include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0024] like Figure 1 As shown, the embodiment of the present disclosure proposes an industrial steam supply system based on a steam heat source, including a cogeneration unit 1, a first heat exchanger 2 and a second heat exchanger 3, the hot side steam inlet end of the first heat exchanger 2 is connected to the main steam outlet end of the cogeneration unit 1, the hot side liquid outlet end of the first heat exchanger 2 is connected to the condensate outlet end of the cogeneration unit 1, the cold side liquid inlet end of the first heat exchanger 2 is connected to the deoxygenated water outlet end of the cogeneration unit 1, the hot side steam inlet end of the second heat exchanger 3 is connected to the reheat steam outlet end of the cogeneration unit 1, the hot side steam outlet end of the second heat exchanger 3 is connected to the low-pressure steam inlet end of the cogeneration unit 1, the cold side steam inlet end of the second heat exchanger 3 is connected to the cold side steam outlet end of the first heat exchanger 2, and the cold side steam outlet end of the second heat exchanger 3 is connected to the steam inlet end of the steam-consuming equipment.

[0025] It can be understood that part of the main steam of the cogeneration unit 1 passes through the hot side of the first heat exchanger 2, and part of the reheated steam of the cogeneration unit 1 passes through the hot side of the second heat exchanger 3. As a result, part of the deoxygenated water of the cogeneration unit 1 is heated into saturated steam by the main steam on the hot side of the first heat exchanger 2 when passing through the cold side of the first heat exchanger 2, and the saturated steam is heated into superheated steam by the reheated steam on the hot side of the second heat exchanger 3 when passing through the cold side of the second heat exchanger 3. The superheated steam is supplied to the steam-consuming equipment for use, so as to realize centralized steam supply and meet the use needs.

[0026] Among them, by using the deoxygenated water of the cogeneration unit 1 as the water source and the main steam and reheat steam of the cogeneration unit 1 as the heat source, the steam supply capacity of the industrial steam supply system is greatly improved, ensuring that the industrial steam supply system can still supply steam stably when the main steam volume of the cogeneration unit 1 is reduced, avoiding the influence of factors such as reheating overheating and deep peak regulation.

[0027] The industrial steam supply system is only equipped with the first heat exchanger 2 and the second heat exchanger 3 on the cogeneration unit 1. It has a simple structure, is easy to install, and has low modification cost. It improves the steam supply capacity while ensuring the safe operation of the cogeneration unit 1.

[0028] It should be noted that the first heat exchanger 2 and the second heat exchanger 3 both include a hot side and a cold side for heat exchange, and heat can be exchanged directly between the hot side and the cold side, or indirectly through a heat exchange medium.

[0029] like Figure 1 As shown, in some embodiments, the industrial steam supply system further includes a variable frequency booster pump 4, which is arranged between the cold side liquid inlet end of the first heat exchanger 2 and the deoxygenated water liquid outlet end of the cogeneration unit 1, the liquid inlet end of the variable frequency booster pump 4 is connected to the deoxygenated water liquid outlet end of the cogeneration unit 1, and the liquid outlet end of the variable frequency booster pump 4 is connected to the cold side liquid inlet end of the first heat exchanger 2.

[0030] It can be understood that the variable frequency booster pump 4 pressurizes part of the deoxygenated water of the cogeneration unit 1 and transports it to the cold side of the first heat exchanger 2 and the cold side of the second heat exchanger 3 to ensure that the deoxygenated water is heated into saturated steam and superheated steam in sequence, thereby meeting the steam demand; moreover, by controlling the frequency of the variable frequency booster pump 4, the pressure of the superheated steam is regulated, thereby meeting the requirements of different steam pressures.

[0031] It should be noted that, under the delivery of the variable frequency booster pump 4, the superheated steam pressure after passing through the cold side of the first heat exchanger 2 and the cold side of the second heat exchanger 3 can reach above 4 MPa, which can meet the steam demand of the chemical, petroleum and other industries.

[0032] like Figure 1 As shown, in some embodiments, the industrial steam supply system further includes a first flow regulating valve 5, which is arranged between the liquid inlet end of the variable frequency booster pump 4 and the deoxygenated water liquid outlet end of the cogeneration unit 1. The liquid inlet end of the first flow regulating valve 5 is connected to the deoxygenated water liquid outlet end of the cogeneration unit 1, and the liquid outlet end of the first flow regulating valve 5 is connected to the liquid inlet end of the variable frequency booster pump 4.

[0033] It can be understood that part of the deoxygenated water of the cogeneration unit 1 enters the cold side of the first heat exchanger 2 and the cold side of the second heat exchanger 3 after passing through the first flow regulating valve 5. Therefore, by controlling the opening of the first flow regulating valve 5, the flow of superheated steam is regulated to meet the needs of different steam flow rates.

[0034] It should be noted that the first flow regulating valve 5 can be a manual regulating valve or an electric regulating valve. A flow meter can also be set on the pipeline between the liquid inlet end of the variable frequency booster pump 4 and the deoxygenated water outlet end of the cogeneration unit 1 to cooperate with the first flow regulating valve 5 to achieve accurate flow regulation.

[0035] like Figure 1 As shown, in some embodiments, the industrial steam supply system further includes a second flow regulating valve 6, which is arranged between the cold side steam outlet end of the second heat exchanger 3 and the steam inlet end of the steam-consuming equipment. The steam inlet end of the second flow regulating valve 6 is connected to the cold side steam outlet end of the second heat exchanger 3, and the steam outlet end of the second flow regulating valve 6 is connected to the steam inlet end of the steam-consuming equipment.

[0036] It can be understood that the superheated steam at the cold side steam outlet of the second heat exchanger 3 enters the steam-consuming equipment after passing through the second flow regulating valve 6. Therefore, by controlling the opening of the second flow regulating valve 6, the flow regulation of the superheated steam is achieved, and through the cooperation of the second flow regulating valve 6 and the first flow regulating valve 5, the flow regulation of the superheated steam is made more precise.

[0037] It should be noted that the second flow regulating valve 6 can be a manual regulating valve or an electric regulating valve. A flow meter can also be installed on the pipeline between the cold side steam outlet of the second heat exchanger 3 and the steam inlet of the steam-consuming equipment to cooperate with the second flow regulating valve 6 to achieve accurate flow regulation.

[0038] like Figure 1 As shown, in some embodiments, the industrial steam supply system further includes a third flow regulating valve 7 and a fourth flow regulating valve 8. The third flow regulating valve 7 is arranged between the hot side liquid outlet of the first heat exchanger 2 and the condensate liquid outlet of the cogeneration unit 1, the liquid inlet of the third flow regulating valve 7 is connected to the hot side liquid outlet of the first heat exchanger 2, and the liquid outlet of the third flow regulating valve 7 is connected to the condensate liquid outlet of the cogeneration unit 1. The fourth flow regulating valve 8 is arranged between the hot side steam outlet of the second heat exchanger 3 and the low-pressure steam inlet of the cogeneration unit 1, the steam inlet of the fourth flow regulating valve 8 is connected to the hot side steam outlet of the second heat exchanger 3, and the steam outlet of the fourth flow regulating valve 8 is connected to the low-pressure steam inlet of the cogeneration unit 1.

[0039] It can be understood that the liquid outlet of the hot side liquid outlet of the first heat exchanger 2 passes through the third flow regulating valve 7 and enters the condensate outlet of the cogeneration unit 1. Therefore, by controlling the opening of the third flow regulating valve 7, the flow of the main steam on the hot side of the first heat exchanger 2 is regulated. The reheated steam at the hot side steam outlet of the second heat exchanger 3 passes through the fourth flow regulating valve 8 and enters the low-pressure steam inlet of the cogeneration unit 1. Therefore, by controlling the opening of the fourth flow regulating valve 8, the flow of the reheated steam on the hot side of the second heat exchanger 3 is regulated. Therefore, through the configuration of the third flow regulating valve 7 and the fourth flow regulating valve 8, the superheated steam temperature is controlled to meet the requirements of different steam temperatures.

[0040] It should be noted that the third flow regulating valve 7 can be a manual regulating valve or an electric regulating valve. A flow meter can also be set on the pipeline between the hot side liquid outlet of the first heat exchanger 2 and the condensate liquid outlet of the cogeneration unit 1 to cooperate with the third flow regulating valve 7 to achieve accurate flow regulation.

[0041] The fourth flow regulating valve 8 can be a manual regulating valve or an electric regulating valve. A flow meter can also be set on the pipeline between the hot side steam outlet of the second heat exchanger 3 and the low-pressure steam inlet end of the cogeneration unit 1 to cooperate with the fourth flow regulating valve 8 to achieve accurate flow regulation.

[0042] like Figure 1 As shown, in some embodiments, the industrial steam supply system further includes a first switch valve 9 and a second switch valve 10. The first switch valve 9 is arranged between the hot side steam inlet end of the first heat exchanger 2 and the main steam outlet end of the cogeneration unit 1. The steam inlet end of the first switch valve 9 is connected to the main steam outlet end of the cogeneration unit 1, and the steam outlet end of the first switch valve 9 is connected to the hot side steam inlet end of the first heat exchanger 2. The second switch valve 10 is arranged between the hot side steam inlet end of the second heat exchanger 3 and the reheat steam outlet end of the cogeneration unit 1. The steam inlet end of the second switch valve 10 is connected to the reheat steam outlet end of the cogeneration unit 1, and the steam outlet end of the second switch valve 10 is connected to the hot side steam inlet end of the second heat exchanger 3.

[0043] It can be understood that the first switch valve 9 is used to open and close the connection between the hot side steam inlet end of the first heat exchanger 2 and the main steam outlet end of the cogeneration unit 1, and the second switch valve 10 is used to open and close the connection between the hot side steam inlet end of the second heat exchanger 3 and the reheat steam outlet end of the cogeneration unit 1. Through the setting of the first switch valve 9 and the second switch valve 10, it is convenient to control the flow direction of the main steam and reheat steam of the cogeneration unit 1, ensuring that the cogeneration unit 1 can stably switch between power generation and steam supply.

[0044] It should be noted that the first on-off valve 9 can be a manual on-off valve or an electric on-off valve.

[0045] The second on-off valve 10 can be a manual on-off valve or an electric on-off valve.

[0046] When the first flow regulating valve 5, the second flow regulating valve 6, the third flow regulating valve 7, the fourth flow regulating valve 8, the first on-off valve 9, and the second on-off valve 10 are all electrically operated valves, the industrial steam supply system may further include a controller, the output end of which is electrically connected to the input ends of the variable frequency booster pump 4, the first flow regulating valve 5, the second flow regulating valve 6, the third flow regulating valve 7, the fourth flow regulating valve 8, the first on-off valve 9, and the second on-off valve 10. It will be appreciated that the provision of the controller facilitates automated control of the entire industrial steam supply system, making the overall use of the industrial steam supply system more convenient.

[0047] like Figure 1As shown, in some embodiments, the cogeneration unit 1 includes a boiler 11, a high-pressure cylinder 12, an intermediate-pressure cylinder 13 and a low-pressure cylinder 14, the main steam outlet of the boiler 11 is connected to the hot side steam inlet of the first heat exchanger 2, the reheated steam outlet of the boiler 11 is connected to the hot side steam inlet of the second heat exchanger 3, the steam inlet of the high-pressure cylinder 12 is connected to the main steam outlet of the boiler 11, the steam outlet of the high-pressure cylinder 12 is connected to the reheated steam inlet of the boiler 11, the steam inlet of the intermediate-pressure cylinder 13 is connected to the reheated steam outlet of the boiler 11, and the steam inlet of the low-pressure cylinder 14 is connected to the steam outlet of the intermediate-pressure cylinder 13 and the hot side steam outlet of the second heat exchanger 3.

[0048] It is understood that after the boiler 11 heats water into main steam, a portion of the main steam enters the hot side of the first heat exchanger 2, and the remaining portion enters the high-pressure cylinder 12 to generate power. The steam that has performed work in the high-pressure cylinder 12 enters the boiler 11 again for reheating to form reheated steam. A portion of the reheated steam enters the hot side of the second heat exchanger 3, and the remaining portion enters the intermediate-pressure cylinder 13 to generate power. The steam that has performed work in the intermediate-pressure cylinder 13 enters the low-pressure cylinder 14 to generate power. Simultaneously, the steam that has exchanged heat on the hot side of the second heat exchanger 3 also enters the low-pressure cylinder 14 to generate power. Thus, the cogeneration unit 1 uses the main steam and reheated steam to generate power, meeting electricity demand.

[0049] like Figure 1 As shown, in some embodiments, the cogeneration unit 1 further includes a condenser 15 and a deaerator 16, the hot side steam inlet end of the condenser 15 is connected to the steam outlet end of the low-pressure cylinder 14, cooling water is introduced into the cold side of the condenser 15, the liquid inlet end of the deaerator 16 is connected to the hot side liquid outlet end of the condenser 15 and the hot side liquid outlet end of the first heat exchanger 2, and the liquid outlet end of the deaerator 16 is connected to the main steam liquid inlet end of the boiler 11 and the cold side liquid inlet end of the first heat exchanger 2.

[0050] It can be understood that the steam after doing work in the low-pressure cylinder 14 enters the hot side of the condenser 15, and under the cooling of the cooling water in the cold side of the condenser 15, the steam after doing work in the low-pressure cylinder 14 condenses into condensate for recycling. The condensate enters the deaerator 16 for deoxygenation to reduce the oxygen content in the condensate, thereby reducing the corrosion of the condensate to various components in the industrial steam supply system, and effectively extending the service life of the industrial steam supply system.

[0051] like Figure 1As shown, in some embodiments, the cogeneration unit 1 further includes a condensate pump 17 and a deaerator pump 18. The condensate pump 17 is arranged between the liquid inlet end of the deaerator 16 and the hot side liquid outlet end of the condenser 15. The liquid inlet end of the condensate pump 17 is connected to the hot side liquid outlet end of the condenser 15, and the liquid outlet end of the condensate pump 17 is connected to the liquid inlet end of the deaerator 16. The deaerator pump 18 is arranged between the liquid outlet end of the deaerator 16 and the main steam liquid inlet end of the boiler 11. The liquid inlet end of the deaerator pump 18 is connected to the liquid outlet end of the deaerator 16, and the liquid outlet end of the deaerator pump 18 is connected to the main steam liquid inlet end of the boiler 11.

[0052] It can be understood that the condensate pump 17 pressurizes the condensate at the liquid outlet of the hot side of the condenser 15 and transports it to the deaerator 16, and the deaerator pump 18 pressurizes the deoxygenated water at the liquid outlet of the deaerator 16 and transports it to the boiler 11. Therefore, the arrangement of the condensate pump 17 and the deoxygenation pump 18 ensures stable deoxygenation and recycling of the condensate.

[0053] like Figure 1 As shown, in some embodiments, the cogeneration unit 1 further includes a high-pressure heater 19 and a low-pressure heater 20. The hot side steam inlet end of the high-pressure heater 19 is connected to the steam outlet end of the high-pressure cylinder 12 and the steam outlet end of the intermediate-pressure cylinder 13 respectively, and the hot side steam outlet end of the high-pressure heater 19 is connected to the steam inlet end of the deaerator 16. The cold side of the high-pressure heater 19 is arranged between the liquid outlet end of the deaerator water pump 18 and the main steam liquid inlet end of the boiler 11. The cold side liquid inlet end of the high-pressure heater 19 is connected to the liquid outlet end of the deaerator water pump 18. The cold side liquid outlet is connected to the main steam liquid inlet of the boiler 11, the hot side steam inlet of the low-pressure heater 20 is respectively connected to the steam outlet of the medium-pressure cylinder 13 and the steam outlet of the low-pressure cylinder 14, the hot side steam outlet of the low-pressure heater 20 is connected to the liquid inlet of the condensate pump 17, the cold side of the low-pressure heater 20 is arranged between the liquid outlet of the condensate pump 17 and the liquid inlet of the deaerator 16, the cold side liquid inlet of the low-pressure heater 20 is connected to the liquid outlet of the condensate pump 17, and the cold side liquid outlet of the low-pressure heater 20 is connected to the liquid inlet of the deaerator 16.

[0054] It is understood that part of the steam at the steam outlet of the intermediate-pressure cylinder 13 and part of the steam at the steam outlet of the low-pressure cylinder 14 pass through the hot side of the low-pressure heater 20 and enter the liquid inlet of the condensate pump 17. As a result, the condensate is heated by the steam on the hot side of the low-pressure heater 20 when passing through the cold side of the low-pressure heater 20, and the heated condensate enters the deaerator 16. At the same time, part of the steam at the steam outlet of the high-pressure cylinder 12 and part of the steam at the steam outlet of the intermediate-pressure cylinder 13 pass through the hot side of the high-pressure heater 19 and enter the deaerator 16. As a result, part of the deoxygenated water is heated by the steam on the hot side of the high-pressure heater 19 when passing through the cold side of the high-pressure heater 19, and the heated deoxygenated water enters the boiler 11. The provision of the high-pressure heater 19 and the low-pressure heater 20 can effectively reduce the energy loss of the boiler 11 and improve the heating efficiency of the deoxygenated water.

[0055] It should be noted that when steam supply is needed, the first switch valve 9, the second switch valve 10, the variable frequency booster pump 4, the first flow regulating valve 5, the second flow regulating valve 6, the third flow regulating valve 7 and the fourth flow regulating valve 8 are opened. At the same time, based on different steam demand, the pressure of the superheated steam can be adjusted by controlling the frequency of the variable frequency booster pump 4, the flow of the superheated steam can be adjusted by controlling the opening of the first flow regulating valve 5 and the second flow regulating valve 6, and the temperature of the superheated steam can be adjusted by controlling the opening of the third flow regulating valve 7 and the fourth flow regulating valve 8.

[0056] When steam supply is not required, the first on-off valve 9, the second on-off valve 10, the variable frequency booster pump 4, the first flow regulating valve 5, the second flow regulating valve 6, the third flow regulating valve 7 and the fourth flow regulating valve 8 are all closed, so that the cogeneration unit 1 only generates electricity.

[0057] It should be noted that, in the description of this disclosure, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0058] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0059] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0060] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. An industrial steam supply system based on steam heat source, characterized in that: include: Combined heat and power units; a first heat exchanger, wherein a hot-side steam inlet of the first heat exchanger is connected to a main steam outlet of the cogeneration unit, a hot-side liquid outlet of the first heat exchanger is connected to a condensate outlet of the cogeneration unit, and a cold-side liquid inlet of the first heat exchanger is connected to a deoxygenated water outlet of the cogeneration unit; The second heat exchanger, the hot side steam inlet end of the second heat exchanger is connected to the reheat steam outlet end of the cogeneration unit, the hot side steam outlet end of the second heat exchanger is connected to the low-pressure steam inlet end of the cogeneration unit, the cold side steam inlet end of the second heat exchanger is connected to the cold side steam outlet end of the first heat exchanger, and the cold side steam outlet end of the second heat exchanger is connected to the steam inlet end of the steam-consuming equipment.

2. The industrial steam supply system based on steam heat source according to claim 1, characterized in that: The industrial steam supply system further comprises: A variable frequency booster pump is arranged between the cold side liquid inlet end of the first heat exchanger and the deoxygenated water liquid outlet end of the cogeneration unit, the liquid inlet end of the variable frequency booster pump is connected to the deoxygenated water liquid outlet end of the cogeneration unit, and the liquid outlet end of the variable frequency booster pump is connected to the cold side liquid inlet end of the first heat exchanger.

3. The industrial steam supply system based on steam heat source according to claim 2, characterized in that: The industrial steam supply system further comprises: The first flow regulating valve is arranged between the liquid inlet end of the variable frequency booster pump and the deoxygenated water liquid outlet end of the cogeneration unit. The liquid inlet end of the first flow regulating valve is connected to the deoxygenated water liquid outlet end of the cogeneration unit, and the liquid outlet end of the first flow regulating valve is connected to the liquid inlet end of the variable frequency booster pump.

4. The industrial steam supply system based on steam heat source according to claim 3 is characterized in that: The industrial steam supply system further comprises: The second flow regulating valve is arranged between the cold side steam outlet end of the second heat exchanger and the steam inlet end of the steam-consuming equipment. The steam inlet end of the second flow regulating valve is connected to the cold side steam outlet end of the second heat exchanger, and the steam outlet end of the second flow regulating valve is connected to the steam inlet end of the steam-consuming equipment.

5. The industrial steam supply system based on steam heat source according to claim 1, characterized in that: The industrial steam supply system further comprises: a third flow regulating valve, the third flow regulating valve being arranged between the hot-side liquid outlet of the first heat exchanger and the condensate liquid outlet of the cogeneration unit, the liquid inlet of the third flow regulating valve being connected to the hot-side liquid outlet of the first heat exchanger, and the liquid outlet of the third flow regulating valve being connected to the condensate liquid outlet of the cogeneration unit; The fourth flow regulating valve is arranged between the hot side steam outlet end of the second heat exchanger and the low-pressure steam inlet end of the cogeneration unit. The steam inlet end of the fourth flow regulating valve is connected to the hot side steam outlet end of the second heat exchanger, and the steam outlet end of the fourth flow regulating valve is connected to the low-pressure steam inlet end of the cogeneration unit.

6. The industrial steam supply system based on steam heat source according to claim 5, characterized in that: The industrial steam supply system further comprises: a first on-off valve, the first on-off valve being arranged between the hot-side steam inlet of the first heat exchanger and the main steam outlet of the cogeneration unit, the steam inlet of the first on-off valve being connected to the main steam outlet of the cogeneration unit, and the steam outlet of the first on-off valve being connected to the hot-side steam inlet of the first heat exchanger; The second on-off valve is arranged between the hot side steam inlet end of the second heat exchanger and the reheat steam outlet end of the cogeneration unit, the steam inlet end of the second on-off valve is connected to the reheat steam outlet end of the cogeneration unit, and the steam outlet end of the second on-off valve is connected to the hot side steam inlet end of the second heat exchanger.

7. The industrial steam supply system based on a steam heat source according to any one of claims 1 to 6, characterized in that: The cogeneration unit comprises: a boiler, wherein a main steam outlet of the boiler is connected to a hot side steam inlet of the first heat exchanger, and a reheat steam outlet of the boiler is connected to a hot side steam inlet of the second heat exchanger; A high-pressure cylinder, wherein the steam inlet end of the high-pressure cylinder is connected to the main steam outlet end of the boiler, and the steam outlet end of the high-pressure cylinder is connected to the reheat steam inlet end of the boiler; An intermediate pressure cylinder, wherein the steam inlet end of the intermediate pressure cylinder is connected to the reheat steam outlet end of the boiler; A low-pressure cylinder, wherein the steam inlet end of the low-pressure cylinder is connected to the steam outlet end of the intermediate-pressure cylinder and the hot-side steam outlet end of the second heat exchanger.

8. The industrial steam supply system based on steam heat source according to claim 7, characterized in that: The cogeneration unit further comprises: A condenser, wherein the hot side steam inlet of the condenser is connected to the steam outlet of the low-pressure cylinder, and cooling water is introduced into the cold side of the condenser; A deaerator, wherein the liquid inlet end of the deaerator is connected to the hot side liquid outlet end of the condenser and the hot side liquid outlet end of the first heat exchanger, and the liquid outlet end of the deaerator is connected to the main steam liquid inlet end of the boiler and the cold side liquid inlet end of the first heat exchanger.

9. The industrial steam supply system based on steam heat source according to claim 8, characterized in that: The cogeneration unit further comprises: A condensate pump, the condensate pump being arranged between the liquid inlet of the deaerator and the hot-side liquid outlet of the condenser, the liquid inlet of the condensate pump being connected to the hot-side liquid outlet of the condenser, and the liquid outlet of the condensate pump being connected to the liquid inlet of the deaerator; A deaerator water pump is provided between the liquid outlet of the deaerator and the main steam liquid inlet of the boiler, the liquid inlet of the deaerator water pump is connected to the liquid outlet of the deaerator, and the liquid outlet of the deaerator water pump is connected to the main steam liquid inlet of the boiler.

10. The industrial steam supply system based on steam heat source according to claim 9, characterized in that: The cogeneration unit further comprises: A high-pressure heater, wherein the hot-side steam inlet end of the high-pressure heater is respectively connected to the steam outlet end of the high-pressure cylinder and the steam outlet end of the intermediate-pressure cylinder, the hot-side steam outlet end of the high-pressure heater is connected to the steam inlet end of the deaerator, the cold side of the high-pressure heater is arranged between the liquid outlet end of the deaeration water pump and the main steam liquid inlet end of the boiler, the cold-side liquid inlet end of the high-pressure heater is connected to the liquid outlet end of the deaeration water pump, and the cold-side liquid outlet end of the high-pressure heater is connected to the main steam liquid inlet end of the boiler; A low-pressure heater, the hot side steam inlet end of the low-pressure heater is respectively connected to the steam outlet end of the medium-pressure cylinder and the steam outlet end of the low-pressure cylinder, the hot side steam outlet end of the low-pressure heater is connected to the liquid inlet end of the condensate pump, the cold side of the low-pressure heater is arranged between the liquid outlet end of the condensate pump and the liquid inlet end of the deaerator, the cold side liquid inlet end of the low-pressure heater is connected to the liquid outlet end of the condensate pump, and the cold side liquid outlet end of the low-pressure heater is connected to the liquid inlet end of the deaerator.

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