CN209942893U - Latent heat recovery system for exhaust vaporization of steam turbine - Google Patents
Latent heat recovery system for exhaust vaporization of steam turbine Download PDFInfo
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- CN209942893U CN209942893U CN201920675134.1U CN201920675134U CN209942893U CN 209942893 U CN209942893 U CN 209942893U CN 201920675134 U CN201920675134 U CN 201920675134U CN 209942893 U CN209942893 U CN 209942893U
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Abstract
The utility model provides a steam turbine exhaust vaporization latent heat recovery system, which is characterized in that the system comprises a medium pressure cylinder, a low pressure cylinder, a condenser, a circulating water pump, a heat supply network heater, a cooling tower and a plurality of valve sets, and the switching of heat supply modes at the initial stage, the middle stage and the final stage of heat supply is realized and the resource allocation is effectively realized through the matched use of a first valve set, a second valve set, a third valve set, a fourth valve set, a fifth valve set, a sixth valve set and a seventh valve set; through the cooperation use of eighth valve group, ninth valve group, tenth valve group, eleventh valve group, bearing seal heater and axle and booster pump, cool off the bearing seal heater through the axle and booster pump back pressure boost of heat supply network circulating water, solved the not enough problem of bearing seal heater cooling capacity.
Description
Technical Field
The disclosure relates to the technical field of steam turbines, in particular to a steam turbine exhaust vaporization latent heat recovery system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The efficiency of the conventional coal-fired thermal power generating unit at the present stage is generally 35-38%, the loss is more than 60%, and the loss of latent heat of vaporization of the steam turbine exhaust accounts for the most part. Because the normal operating backpressure of the steam turbine is lower, the corresponding exhaust energy grade is lower, and the recovery and utilization are difficult to carry out, and in the 6 MW-50 MW grade capacity unit of early stage low capacity, low parameter, the low vacuum operation heat supply recovery unit exhaust latent heat of vaporization is generally adopted, however, the inventor finds in research that the scheme is only suitable for small units, the heat supply range is smaller, the hot water grade is lower, and large-area popularization cannot be realized.
Disclosure of Invention
In order to solve the defects of the prior art, the steam turbine exhaust vaporization latent heat recovery system is provided by the disclosure, when the system is operated in a heating period, the steam turbine exhaust level is improved by replacing a heat supply low-pressure rotor with fewer blades, heat supply network circulating water enters a condenser through an original circulating water pipeline to absorb the exhaust vaporization latent heat and is directly used for heating, and the shaft seal heater is cooled after the pressure of the heat supply network circulating water is increased through a shaft booster pump, so that the problem of insufficient cooling capacity of the shaft seal heater is solved.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a steam turbine exhaust vaporization latent heat recovery system comprises a medium pressure cylinder, a low pressure cylinder, a condenser, a circulating water pump, a heat supply network heater, a cooling tower, a generator and a plurality of valve sets, wherein a heat supply low pressure rotor is arranged in the low pressure cylinder, one end of the heat supply low pressure rotor is fixedly connected with the medium pressure rotor in the medium pressure cylinder, and the other end of the heat supply low pressure rotor is fixedly connected with a generator rotor; the valve group comprises a first valve group, a second valve group, a third valve group, a fourth valve group, a fifth valve group, a sixth valve group and a seventh valve group, a steam outlet of the intermediate pressure cylinder is respectively connected with a steam inlet of the low pressure cylinder and one end of the first valve group, the other end of the first valve group is respectively connected with a steam inlet of the heating network heater and one end of the sixth valve group, and the other end of the sixth valve group is connected with a steam extraction pipeline and used for receiving the engine-approaching extracted steam; one end of the second valve group is connected with a water inlet of the heat supply network heater through a heat supply network circulating water pump, and a water outlet of the heat supply network heater is connected with a water supply pipeline of the heat supply network; a heat supply network water outlet of the condenser is respectively connected with the other end of the second valve group and one end of the third valve group, the other end of the third valve group is connected with the cooling tower, a heat supply network water inlet of the condenser is respectively connected with one ends of a fourth valve group and a fifth valve group, the other end of the fourth valve group is connected with the cooling tower through a circulating water pump, and the other end of the fifth valve group is connected with a heat supply network water return pipeline; and an outlet of the condenser condensed water hot well is connected with one end of a seventh valve group through a condensed water pump, and the other end of the seventh valve group is connected with a condensed water pipeline.
As some possible implementation manners, the steam condenser further comprises a shaft seal heater, a shaft-added booster pump, an eighth valve group, a ninth valve group, a tenth valve group and an eleventh valve group, wherein an outlet of a condensate water hot well of the steam condenser is further connected with one end of the eighth valve group through a condensate pump, the other end of the eighth valve group is respectively connected with one ends of the shaft seal heater and the shaft-added booster pump, the other end of the shaft seal heater is respectively connected with one ends of the ninth valve group and the tenth valve group, the other end of the ninth valve group is connected with a condensate water pipeline, the other end of the tenth valve group is connected with a heat supply network water return pipeline, and the heat supply network water return pipeline is further respectively connected with one end of the eleventh valve group and the other end of the fifth valve group.
As some possible implementation manners, the low-pressure cylinder is connected with the condenser through a steam exhaust pipeline, and a twelfth valve group is arranged on the steam exhaust pipeline between the low-pressure cylinder and the condenser.
The hydraulic system further comprises a thirteenth valve group, and the intermediate pressure cylinder and the low pressure cylinder are connected through the thirteenth valve group.
As some possible realization modes, the condensed water pipeline is connected with a deaerator and used for removing oxygen steam in the condensed water.
As some possible implementations, the valve sets each include at least one of a safety valve, a check valve, a quick-closing regulator valve, and an electric butterfly valve.
As some possible implementations, at least one group is respectively arranged in each valve group.
As some possible realization modes, the number of the blades of the heat supply low-pressure rotor is lower than that of the blades of the original steam turbine rotor, and the heat supply low-pressure rotor is fixedly connected with the intermediate pressure cylinder rotor through a semi-flexible coupling.
As some possible implementations, the semi-flexible coupling is fixedly connected by hydraulic bolts.
As some possible realization modes, the heat supply low-pressure rotor is fixedly connected with the generator rotor through a sleeved coupling.
Compared with the prior art, the beneficial effect of this disclosure is:
the latent heat recovery system improves the steam exhaust level of the steam turbine by replacing the heat supply low-pressure rotor with less blades during the operation in the heat supply period, and the circulating water of a heat supply network enters the condenser through the original circulating water pipeline to absorb the latent heat of vaporization of exhaust steam and is directly used for heating, thereby greatly improving the energy utilization efficiency and reducing the resource waste.
The latent heat recovery system fully considers the defect of insufficient cooling capacity of the shaft seal heater, and designs the shaft seal heater cooled after the circulating water of the heat supply network is boosted by the shaft booster pump.
The latent heat recovery system disclosed by the invention is replaced to the original low-pressure rotor when in non-heat supply period operation, the system recovers to operate in the original state, and the replacement is simple and convenient.
The latent heat recovery system disclosed by the disclosure absorbs heat in the condenser to supply heat at the initial stage and the final stage of heat supply, and performs supplementary heating through the heat supply network heater at the middle stage of heat supply, so that staged heat supply is realized, and heat supply requirements of different stages are met.
According to the connection structure, the semi-flexible coupling is adopted to realize the connection of the heat supply low-pressure rotor and the intermediate-pressure cylinder rotor, and the firmness and the stability of the connection are greatly improved by combining the hydraulic valve.
Each valve group respectively including a plurality of valves such as relief valve, check valve, quick-closing control valve and electric butterfly valve that set gradually to realized the effective control to the extraction pipeline, guaranteed the safety of extraction, also can realize emergency shutdown under the emergency through each valve.
Drawings
Fig. 1 is a schematic structural diagram of a latent heat of vaporization recovery system of a steam turbine exhaust steam according to embodiment 1 of the present disclosure.
Fig. 2 is a schematic structural diagram of a latent heat of vaporization recovery system of steam turbine exhaust according to embodiment 2 of the present disclosure.
Fig. 3 is a schematic structural diagram of a latent heat of vaporization recovery system of steam turbine exhaust according to embodiment 3 of the present disclosure.
1-a first valve group; 2-a second valve group; 3-a third valve group; 4-fourth valve group; 5-fifth valve set; 6-sixth valve group; 7-seventh valve group; 8-eighth valve group; 9-ninth valve set; 10-tenth valve set; 11-eleventh valve set; 12-an intermediate pressure cylinder; 13-low pressure cylinder; 14-a heating network heater; 15-heat supply network circulating water pump; 16-heat supply network water supply pipeline; 17-a cooling tower; 18-a circulating water pump; 19-a condenser; 20-a condenser heat supply network water outlet; 21-a condenser heat supply network water inlet; 22-outlet of the condenser hot well; 23-a deaerator; 24-shaft booster pump; 25-a heat supply network water return pipeline; 26-a condensate pump; 28-on-machine steam; 29-twelfth valve set; 30-thirteenth valve group.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1:
as shown in fig. 1, an embodiment 1 of the present disclosure provides a turbine exhaust vaporization latent heat recovery system, which includes an intermediate pressure cylinder 12, a low pressure cylinder 13, a condenser 19, a circulating water pump 18, a heat supply network circulating water pump 15, a heat supply network heater 14, a cooling tower 17, a generator, and a plurality of valve sets, a heat supply low pressure rotor is provided in the low pressure cylinder 13, the number of blades of the heat supply low pressure rotor is lower than that of the original turbine low pressure rotor, the heat supply low pressure rotor is fixedly connected to the intermediate pressure cylinder rotor through a semi-flexible coupling, the semi-flexible coupling is fixedly connected through a hydraulic bolt, the heat supply low pressure rotor is fixedly connected to the generator rotor through a sleeved coupling, and the low pressure cylinder 13 is connected to the condenser 19 through an exhaust pipe.
The valve group comprises a first valve group 1, a second valve group 2, a third valve group 3, a fourth valve group 4, a fifth valve group 5, a sixth valve group 6 and a seventh valve group 7, a steam outlet of the intermediate pressure cylinder 12 is respectively connected with a steam inlet of the low pressure cylinder 13 and one end of the first valve group 1, the other end of the first valve group 1 is respectively connected with a steam inlet of the heating network heater 14 and one end of the sixth valve group 6, and the other end of the sixth valve group 6 is connected with a steam extraction pipeline and is used for receiving the steam on-line 28 of an adjacent unit or the steam extraction of other units; one end of the second valve group 2 is connected with a water inlet of a heat supply network heater 14 through a heat supply network circulating water pump 15, and a water outlet of the heat supply network heater 14 is connected with a heat supply network water supply pipeline 16; a condenser heat supply network water outlet 20 is respectively connected with the other end of the second valve group 2 and one end of the third valve group 3, the other end of the third valve group 3 is connected with the cooling tower 17, the condenser 19 comprises a condenser heat supply network water inlet 21 and a condenser heat well outlet 22, the condenser heat supply network water inlet 21 is respectively connected with one end of the fourth valve group 4 and one end of the fifth valve group 5, the other end of the fourth valve group 4 is connected with the cooling tower 17 through a circulating water pump 18, and the other end of the fifth valve group 5 is connected with a heat supply network water return pipeline 25; the condenser hot well outlet 22 is connected with one end of a seventh valve group 7 through a condensate pump 26, and the other end of the seventh valve group 7 is connected with a condensate pipeline.
The condenser hot well outlet 22 is connected with one end of the eighth valve group 8 through a condensate pump 26, the other end of the eighth valve group 8 is connected with one ends of the shaft seal heater 27 and the shaft charge booster pump 24 respectively, the other end of the shaft seal heater 27 is connected with one ends of the ninth valve group 9 and the tenth valve group 10 respectively, the other end of the ninth valve group 9 is connected with a condensate water pipeline, the other end of the tenth valve group 10 is connected with a hot network water return pipeline 25, and the hot network water return pipeline 25 is connected with one end of the eleventh valve group 11 and the other end of the fifth valve group 5 respectively.
The condensed water pipeline is connected with the deaerator and used for removing oxygen in the condensed water, the valve groups respectively comprise at least one of a safety valve, a check valve, a quick-closing regulating valve and an electric butterfly valve, and each valve group is at least provided with one group.
The working principle is as follows:
when the heat supply system operates in the initial stage and the final stage of heat supply, because the heat supply network requires lower heat load and temperature, the first valve group, the third valve group, the fourth valve group, the sixth valve group, the eighth valve group and the ninth valve group are closed, and the second valve group, the fifth valve group, the seventh valve group, the tenth valve group and the eleventh valve group are opened; opening a shaft booster pump 24, a condensate pump 26 and a heat supply network circulating water pump 15; the circulating water pump 18 is turned off. At the moment, a part of the circulating water of the heat supply network enters a condenser through a valve group 5 to absorb heat, and then enters a water supply pipeline of the heat supply network after passing through a heater of the heat supply network through a valve group 2 and a circulating water pump 15 of the heat supply network. The other part of the heat supply network circulating water passes through the valve group 11, enters the shaft seal heater 27 after being boosted by the shaft boosting pump 24 to absorb heat, and then is pumped back to the heat supply network circulating water return pipeline 25 through the tenth valve group 10. The heated condensed water bypasses the shaft seal heater 27 through the seventh valve group 7 and then enters the condensed water pipeline 23.
When the heat supply system is operated in the middle period of heat supply, because the heat supply network requires higher heat load and temperature, the third, fourth, eighth and ninth valve groups are closed, and the first, second, fifth, sixth, seventh, tenth and eleventh valve groups are opened; the shaft booster pump 24, the condensate pump 26 and the heat supply network circulating water pump 15 are turned on, and the circulating water pump 18 is turned off. At the moment, a part of the heat supply network circulating water enters a condenser through a valve group 5 to absorb heat, and then enters a heat supply network water supply pipeline 16 after being secondarily heated by a heat supply network heater through a valve group 2 and a heat supply network circulating water pump 15. The other part of the heat supply network circulating water enters the shaft seal heater 27 to absorb heat after being boosted by the shaft boosting pump through the valve group 11 and then is pumped back to the heat supply network circulating water return pipeline 25. The heated condensed water bypasses the shaft seal heater 27 through the seventh valve group 7 and then enters the condensed water pipeline 23.
When the non-heating operation is performed, the heat supply network circulating water is stopped due to the heat supply, the original pure condensation low-pressure rotor is replaced at the moment, the first valve group, the second valve group, the fifth valve group, the sixth valve group, the seventh valve group, the tenth valve group and the eleventh valve group are closed, and the third valve group, the fourth valve group, the eighth valve group and the ninth valve group are opened; closing the shaft-adding booster pump 24 and the heat supply network circulating water pump 15; turning on the circulating water pump 18 and the condensate pump 26; at the moment, circulating water enters the condenser 19 through the valve group 4 to absorb heat and then enters the cooling tower to be cooled 17 through the valve group 3.
Example 2:
as shown in fig. 2, an embodiment 2 of the present disclosure provides a system for recovering latent heat of vaporization of steam turbine exhaust, including an intermediate pressure cylinder 12, a low pressure cylinder 13, a condenser 19, a circulating water pump 18, a heat supply network circulating water pump 15, a heat supply network heater 14, a cooling tower 17, a generator, and a plurality of valve sets, where a heat supply low pressure rotor is disposed in the low pressure cylinder 13, the number of blades of the heat supply low pressure rotor is lower than that of a low pressure rotor of an original steam turbine, the heat supply low pressure rotor is fixedly connected with the intermediate pressure cylinder rotor through a semi-flexible coupling, the semi-flexible coupling is fixedly connected through a hydraulic bolt, and the heat supply low pressure rotor is fixedly connected with a generator rotor through a sleeved; the low-pressure cylinder 13 is connected with the condenser 19 through a steam exhaust pipeline, a twelfth valve group 29 is arranged on the steam exhaust pipeline between the low-pressure cylinder 13 and the condenser 19, and the twelfth valve group 29 is used for cutting off the steam exhaust pipeline between the low-pressure cylinder 13 and the condenser 19 when the system is overhauled.
The valve group comprises a first valve group 1, a second valve group 2, a third valve group 3, a fourth valve group 4, a fifth valve group 5, a sixth valve group 6 and a seventh valve group 7, a steam outlet of the intermediate pressure cylinder 12 is respectively connected with a steam inlet of the low pressure cylinder 13 and one end of the first valve group 1, the other end of the first valve group 1 is respectively connected with a steam inlet of the heating network heater 14 and one end of the sixth valve group 6, and the other end of the sixth valve group 6 is connected with a steam extraction pipeline and is used for receiving the steam on-line 28 of an adjacent unit or the steam extraction of other units; one end of the second valve group 2 is connected with a water inlet of a heat supply network heater 14 through a heat supply network circulating water pump 15, and a water outlet of the heat supply network heater 14 is connected with a heat supply network water supply pipeline 16; the condenser heat supply network water outlet 20 is respectively connected with the other end of the second valve group 2 and one end of the third valve group 3, the other end of the third valve group 3 is connected with the cooling tower 17, the condenser 19 comprises a condenser heat supply network water inlet 21 and a condenser hot well outlet 22, the condenser heat supply network water inlet 21 is respectively connected with one end of the fourth valve group 4 and one end of the fifth valve group 5, the other end of the fourth valve group 4 is connected with the cooling tower 17 through the circulating water pump 18, and the other end of the fifth valve group 5 is connected with a heat supply network water return pipeline 25; the condenser hot well outlet 22 is connected with one end of a seventh valve group 7 through a condensate pump 26, and the other end of the seventh valve group 7 is connected with a condensate pipeline 23.
The condenser hot well outlet 22 is connected with one end of the eighth valve group 8 through a condensate pump 26, the other end of the eighth valve group 8 is connected with one ends of the shaft seal heater 27 and the shaft charge booster pump 24 respectively, the other end of the shaft seal heater 27 is connected with one ends of the ninth valve group 9 and the tenth valve group 10 respectively, the other end of the ninth valve group 9 is connected with a condensate water pipeline, the other end of the tenth valve group 10 is connected with a hot network water return pipeline 25, and the hot network water return pipeline 25 is connected with one end of the eleventh valve group 11 and the other end of the fifth valve group 5 respectively.
The condensed water pipeline 23 is connected with a deaerator and used for removing oxygen in condensed water, the valve sets respectively comprise at least one of a safety valve, a check valve, a quick-closing regulating valve and an electric butterfly valve, and each valve set is respectively provided with at least one set.
The working principle is as follows:
when the heat supply system operates in the initial stage and the final stage of heat supply, because the heat supply network requires lower heat load and temperature, the first valve group, the third valve group, the fourth valve group, the sixth valve group, the eighth valve group and the ninth valve group are closed, and the second valve group, the fifth valve group, the seventh valve group, the tenth valve group, the eleventh valve group and the twelfth valve group are opened; opening a shaft booster pump 24, a condensate pump 26 and a heat supply network circulating water pump 15; the circulating water pump 18 is turned off. At the moment, a part of the circulating water of the heat supply network enters a condenser through a valve group 5 to absorb heat, and then enters a water supply pipeline of the heat supply network after passing through a heat supply network heater through a valve group 2 and a circulating water pump 18 of the heat supply network. The other part of the heat supply network circulating water enters the shaft seal heater 27 to absorb heat after being boosted by the shaft boosting pump 24 through the valve group 11 and then is pumped back to the heat supply network circulating water return pipeline 25. The heated condensed water bypasses the shaft seal heater 27 through the seventh valve group 7 and then enters the condensed water pipeline 23.
When the heat supply system is operated in the middle period of heat supply, because the heat supply network requires higher heat load and temperature, the third, fourth, eighth and ninth valve groups are closed, and the first, second, fifth, sixth, seventh, tenth, eleventh and twelfth valve groups are opened; the shaft booster pump 24, the condensate pump 26 and the heat supply network circulating water pump 15 are turned on, and the circulating water pump 18 is turned off. At the moment, a part of the heat supply network circulating water enters a condenser through a valve group 5 to absorb heat, and then enters a heat supply network water supply pipeline 16 after being secondarily heated through a valve group 2 and a heat supply network circulating water pump 15 by a heat supply network heater 14. The other part of the heat supply network circulating water passes through the valve group 11, enters the shaft seal heater 27 after being boosted by the shaft boosting pump 24 to absorb heat and then is pumped back to the heat supply network circulating water return pipeline 25. The heated condensed water bypasses the shaft seal heater 27 through the seventh valve group 7 and then enters the condensed water pipeline 23.
When the non-heating operation is performed, the heat supply network circulating water is stopped due to the heat supply, the original pure condensation low-pressure rotor is replaced at the moment, the first valve group, the second valve group, the fifth valve group, the sixth valve group, the seventh valve group, the tenth valve group and the eleventh valve group are closed, and the third valve group, the fourth valve group, the eighth valve group, the ninth valve group and the twelfth valve group are opened; closing the shaft-adding booster pump 24 and the heat supply network circulating water pump 15; turning on the circulating water pump 18 and the condensate pump 26; at the moment, circulating water enters the condenser 19 through the valve group 4 to absorb heat and then enters the cooling tower 17 through the valve group 3 to be cooled.
Example 3:
as shown in fig. 3, embodiment 3 of the present disclosure provides a turbine exhaust vaporization latent heat recovery system, which includes an intermediate pressure cylinder 12, a low pressure cylinder 13, a condenser 19, a circulating water pump 18, a heat supply network circulating water pump 15, a heat supply network heater 14, a cooling tower 17, a generator, and a plurality of valve sets, a heat supply low pressure rotor is provided in the low pressure cylinder 13, the number of blades of the heat supply low pressure rotor is lower than that of the original turbine low pressure rotor, the heat supply low pressure rotor is fixedly connected to the intermediate pressure cylinder rotor through a semi-flexible coupling, the semi-flexible coupling is fixedly connected to the generator rotor through a hydraulic bolt, the heat supply low pressure rotor is fixedly connected to the generator rotor through a sleeved coupling, and the low pressure cylinder 13 is connected to the condenser 19 through an exhaust pipe.
The valve group comprises a first valve group 1, a second valve group 2, a third valve group 3, a fourth valve group 4, a fifth valve group 5, a sixth valve group 6 and a seventh valve group 7, a steam outlet of the intermediate pressure cylinder 12 is respectively connected with a steam inlet of the low pressure cylinder 13 and one end of the first valve group 1, the other end of the first valve group 1 is respectively connected with a steam inlet of the heating network heater 14 and one end of the sixth valve group 6, and the other end of the sixth valve group 6 is connected with a steam extraction pipeline and is used for receiving the steam on-line 28 of an adjacent unit or the steam extraction of other units; one end of the second valve group 2 is connected with a water inlet of a heat supply network heater 14 through a heat supply network circulating water pump 15, and a water outlet of the heat supply network heater 14 is connected with a heat supply network water supply pipeline 16; the condenser heat supply network water outlet 20 is respectively connected with the other end of the second valve group 2 and one end of the third valve group 3, the other end of the third valve group 3 is connected with the cooling tower 17, the condenser 19 comprises a condenser heat supply network water inlet 21 and a condenser hot well outlet 22, the condenser heat supply network water inlet 21 is respectively connected with one end of the fourth valve group 4 and one end of the fifth valve group 5, the other end of the fourth valve group 4 is connected with the cooling tower 17 through the circulating water pump 18, and the other end of the fifth valve group 5 is connected with a heat supply network water return pipeline 25; the condenser hot well outlet 22 is connected with one end of a seventh valve group 7 through a condensate pump 26, and the other end of the seventh valve group 7 is connected with a condensate pipeline 23.
The condenser hot well outlet 22 is connected with one end of the eighth valve group 8 through a condensate pump 26, the other end of the eighth valve group 8 is connected with one ends of the shaft seal heater 27 and the shaft charge booster pump 24 respectively, the other end of the shaft seal heater 27 is connected with one ends of the ninth valve group 9 and the tenth valve group 10 respectively, the other end of the ninth valve group 9 is connected with a condensate water pipeline, the other end of the tenth valve group 10 is connected with a hot network water return pipeline 25, and the hot network water return pipeline 25 is connected with one end of the eleventh valve group 11 and the other end of the fifth valve group 5 respectively. The steam extraction device further comprises a thirteenth valve group 30, the intermediate pressure cylinder 12 is connected with the low pressure cylinder 13 through the thirteenth valve group 30, and the thirteenth valve group 30 is used for cutting off a steam extraction pipeline between the intermediate pressure cylinder and the low pressure cylinder during maintenance.
The condensed water pipeline 23 is connected with a deaerator and used for removing oxygen in condensed water, the valve sets respectively comprise at least one of a safety valve, a check valve, a quick-closing regulating valve and an electric butterfly valve, and each valve set is respectively provided with at least one set.
The working principle is as follows:
when the heat supply system operates in the initial stage and the final stage of heat supply, because the heat supply network requires lower heat load and temperature, the first valve group, the third valve group, the fourth valve group, the sixth valve group, the eighth valve group and the ninth valve group are closed, and the second valve group, the fifth valve group, the seventh valve group, the tenth valve group, the eleventh valve group and the thirteenth valve group are opened; opening a shaft booster pump 24, a condensate pump 26 and a heat supply network circulating water pump 15; the circulating water pump 18 is turned off. At the moment, a part of the circulating water of the heat supply network enters a condenser through a valve group 5 to absorb heat, and then enters a water supply pipeline of the heat supply network after passing through a heat supply network heater through a valve group 2 and a circulating water pump 18 of the heat supply network. The other part of the heat supply network circulating water enters the shaft seal heater 27 to absorb heat after being boosted by the shaft boosting pump 24 through the valve group 11 and then is pumped back to the heat supply network circulating water return pipeline. The heated condensed water bypasses the shaft seal heater 27 through the seventh valve group 7 and then enters the condensed water pipeline 23.
When the heat supply system is operated in the middle period of heat supply, because the heat supply network requires higher heat load and temperature, the third, fourth, eighth and ninth valve groups are closed, and the first, second, fifth, sixth, seventh, tenth, eleventh and thirteenth valve groups are opened; the shaft booster pump 24, the condensate pump 26 and the heat supply network circulating water pump 15 are turned on, and the circulating water pump 18 is turned off. At the moment, a part of the heat supply network circulating water enters a condenser through a valve group 5 to absorb heat, and then enters a heat supply network water supply pipeline 16 after being secondarily heated by a heat supply network heater through a valve group 2 and a heat supply network circulating water pump 15. The other part of the heat supply network circulating water passes through the valve group 11, enters the shaft seal heater 27 after being boosted by the shaft boosting pump 24 to absorb heat and then is pumped back to the heat supply network circulating water return pipeline 25. The heated condensed water bypasses the shaft seal heater 27 through the seventh valve group 7 and then enters the condensed water pipeline 23.
When the non-heating operation is performed, the heat supply network circulating water is stopped due to the heat supply, the original pure condensation low-pressure rotor is replaced at the moment, the first valve group, the second valve group, the fifth valve group, the sixth valve group, the seventh valve group, the tenth valve group and the eleventh valve group are closed, and the third valve group, the fourth valve group, the eighth valve group, the ninth valve group and the thirteenth valve group are opened; closing the shaft-adding booster pump 24 and the heat supply network circulating water pump 15; turning on the circulating water pump 18 and the condensate pump 26; at the moment, circulating water enters the condenser 19 through the valve group 4 to absorb heat and then enters the cooling tower 17 through the valve group 3 to be cooled.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The system is characterized by comprising a medium pressure cylinder, a low pressure cylinder, a condenser, a circulating water pump, a heat supply network heater, a cooling tower, a generator and a plurality of valve sets, wherein a heat supply low pressure rotor is arranged in the low pressure cylinder; the valve group comprises a first valve group, a second valve group, a third valve group, a fourth valve group, a fifth valve group, a sixth valve group and a seventh valve group, a steam outlet of the intermediate pressure cylinder is respectively connected with a steam inlet of the low pressure cylinder and one end of the first valve group, the other end of the first valve group is respectively connected with a steam inlet of the heating network heater and one end of the sixth valve group, and the other end of the sixth valve group is connected with a steam extraction pipeline and used for receiving hot steam; one end of the second valve group is connected with a water inlet of the heat supply network heater through a heat supply network circulating water pump, and a water outlet of the heat supply network heater is connected with a water supply pipeline of the heat supply network; a condenser heat supply network water outlet is respectively connected with the other end of the second valve group and one end of the third valve group, the other end of the third valve group is connected with the cooling tower, a condenser heat supply network water inlet is respectively connected with one end of the fourth valve group and one end of the fifth valve group, the other end of the fourth valve group is connected with the cooling tower through a circulating water pump, and the other end of the fifth valve group is connected with a heat supply network water return pipeline; and an outlet of the condenser hot well is connected with one end of a seventh valve group through a condensate pump, and the other end of the seventh valve group is connected with a condensate pipeline.
2. The steam turbine exhaust steam vaporization latent heat recovery system according to claim 1, further comprising a shaft seal heater, a shaft charging booster pump, an eighth valve group, a ninth valve group, a tenth valve group and an eleventh valve group, wherein the outlet of the condenser hot well is further connected to one end of the eighth valve group through a condensate pump, the other end of the eighth valve group is connected to one end of the shaft seal heater and one end of the shaft charging booster pump, the other end of the shaft seal heater is connected to one end of the ninth valve group and one end of the tenth valve group, the other end of the ninth valve group is connected to a condensate pipe, the other end of the tenth valve group is connected to a heat supply network return pipe, and the heat supply network return pipe is further connected to one end of the eleventh valve group and the other end of the fifth valve group.
3. The exhaust steam latent heat of vaporization recovery system of a steam turbine according to claim 1, wherein said low pressure cylinder is connected to said condenser through an exhaust pipe, and a twelfth valve set is provided on said exhaust pipe between said low pressure cylinder and said condenser.
4. The turbine discharge latent heat of vaporization recovery system of claim 1 further comprising a thirteenth valve set, wherein said intermediate pressure cylinder and said low pressure cylinder are connected by said thirteenth valve set.
5. The turbine exhaust latent heat of vaporization recovery system of claim 1 wherein the condensate conduit is connected to a deaerator for removing oxygen from the condensate.
6. The turbine discharge latent heat of vaporization recovery system of claim 4 wherein said valve sets each include at least one of a safety valve, a check valve, a quick-closing regulator valve, and an electrically operated butterfly valve.
7. The turbine exhaust latent heat of vaporization recovery system of claim 4 wherein at least one valve set is provided for each valve set.
8. The turbine exhaust steam latent heat of vaporization recovery system of claim 1, wherein the number of blades of said heat supplying low pressure rotor is smaller than the number of blades of the original turbine low pressure rotor, and said heat supplying low pressure rotor is fixedly connected to the intermediate pressure cylinder rotor by a semi-flexible coupling.
9. The turbine exhaust latent heat of vaporization recovery system of claim 8 wherein said semi-flexible coupling is fixedly attached by hydraulic bolts.
10. The turbine exhaust latent heat of vaporization recovery system of claim 1 wherein said heat supplying low pressure spool is fixedly coupled to said generator spool by a slip-on coupling.
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