CN218672327U - Exhaust steam temperature adjusting device of backpressure machine and thermal generator set heating system - Google Patents

Abstract

The utility model relates to a backpressure machine exhaust steam temperature regulating device and a thermal generator set heating system, wherein the backpressure machine exhaust steam temperature regulating device comprises a backpressure machine, a boiler flue and a heat exchanger, the backpressure machine is provided with a steam inlet for steam to enter and a steam outlet for steam to discharge; the boiler flue is used for being communicated with a flue gas outlet of the boiler body; the heat exchanger includes first core, first core has the first passageway that is used for supplying the steam circulation in vivo, first core has outward to be used for supplying boiler flue gas to flow and carry out the second passageway of heat exchange with steam, and the steam inlet of first passageway communicates in the steam extraction mouth through first steam transmission pipeline, the steam outlet of first passageway is used for communicating with outside heating system through second steam transmission pipeline, the second passageway communicates in the boiler flue, with can realize that the boiler flue gas heats steam, thereby make steam temperature can satisfy user's heat supply demand, still guarantee simultaneously that the backpressure can high-efficient and stable operation.

Description

Exhaust steam temperature adjusting device of backpressure machine and thermal generator set heating system

Technical Field

The disclosure relates to the technical field of thermal generator sets, in particular to a backpressure machine exhaust steam temperature adjusting device and a thermal generator set heating system.

Background

At present, various domestic power plants select a reasonable steam extraction steam source scheme according to the steam parameter requirements of industrial users, and the steam extraction scheme commonly comprises main steam extraction, cold re-extraction, hot re-extraction, communicating pipe steam extraction and the like, so that a specific technical route is determined by reasonably utilizing the steam quality. With the continuous improvement of the requirement of deep peak regulation, the low-load operation of the unit becomes a normal state, the parameters of cold re-extraction and hot re-extraction are greatly reduced during the deep peak regulation, the extraction parameters of a plurality of power plants cannot meet the steam demand of industrial users, and then a steam source with relatively high extraction parameters is selected.

The high-parameter steam source has high quality, so that the high-parameter steam source is generally utilized in a cascade mode, the main steam is controlled to be relatively stable in pressure, temperature and flow, then enters a back pressure machine to drive the back pressure machine to do work, the load can be a generator or various machines such as a fan and a compressor, and if the load is the generator, the load can be used for connecting service loads. The steam exhaust of the back press is used for supplying heat to the outside, and by the mode, the excessive waste of the steam quality is avoided.

In the related art, because an industrial user has a certain requirement on steam supply temperature, especially when a generator set is in a low electric load, the design efficiency of a back pressure machine often has to be reduced in order to meet the requirement of the industrial user within a wide load operation range, and the problem that the requirement of the industrial user cannot be met due to too low exhaust steam temperature is avoided, so that the back pressure machine cannot operate efficiently, and the applicability is poor. In addition, a large amount of high-temperature flue gas can be generated in the combustion process of fuel in the boiler, and the problem to be solved by technical personnel is also the problem of how to recycle the energy in the high-temperature flue gas.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a backpressure machine exhaust temperature adjusting device and thermal generator set heating system, this backpressure machine exhaust temperature adjusting device can solve above-mentioned technical problem.

In order to achieve the above object, a first aspect of the present disclosure provides a backpressure machine exhaust steam temperature adjusting device, including: the back press is provided with a steam inlet for steam to enter and a steam outlet for steam to discharge; the boiler flue is communicated with a flue gas outlet of the boiler body; the heat exchanger comprises a first core body, wherein a first channel for supplying steam to circulate is arranged in the first core body, a second channel for allowing boiler flue gas to flow through and exchanging heat with steam is arranged outside the first core body, a steam inlet of the first channel is communicated with the steam exhaust port through a first steam conveying pipeline, a steam outlet of the first channel is communicated with an external heating system through a second steam conveying pipeline, and the second channel is communicated with the boiler flue.

Optionally, the steam heating device further comprises an auxiliary electric heater arranged on the heat exchanger for auxiliary heating of the steam flowing through the first channel.

Optionally, the auxiliary electric heater is electrically connected to the service power system.

Optionally, the auxiliary electric heater is configured as a resistive wire heater disposed within the first channel.

Optionally, the first steam transmission pipeline includes a first branch and a second branch connected in parallel, and the first branch and the second branch are respectively communicated with the steam inlet of the first channel and the second steam transmission pipeline; and a first isolating valve is arranged on the first branch, and a second isolating valve is arranged on the second branch.

Optionally, a first non-return valve is further disposed on the first steam delivery pipe, and the first non-return valve is located at an end close to the steam outlet of the back press and upstream of a connection of the first branch and the second branch.

Optionally, a third isolation valve is further disposed on the second steam transmission pipeline, and the third isolation valve is located at an end close to the steam outlet of the first channel and upstream of a connection between the second branch and the second steam transmission pipeline.

Optionally, the boiler flue includes a first pipe section and a second pipe section, the first pipe section is communicated with the flue gas inlet of the second channel, the second pipe section is communicated with the flue gas outlet of the second channel, and a fourth isolation valve and a fifth isolation valve are respectively arranged on the first pipe section and the second pipe section; a third pipe section is communicated between the first pipe section and the second pipe section, the connection position of the third pipe section and the first pipe section is located at the upstream of the fourth isolation valve, the connection position of the third pipe section and the second pipe section is located at the downstream of the fifth isolation valve, and a sixth isolation valve is arranged on the third pipe section.

Optionally, the heat exchanger is configured as a tube heat exchanger and includes a housing, a plurality of the first cores are arranged at intervals in the housing, gaps between the plurality of the first cores are formed as the second channel, and the first channel and the second channel are arranged perpendicular to each other.

The second aspect of this disclosure still provides a thermal generator set heating system, including boiler body, main steam turbine, main steam conduit, outside heating system and as above backpressure machine exhaust steam temperature regulation apparatus, the steam outlet of boiler body through main steam conduit communicate in the steam inlet of main steam turbine, the steam inlet of backpressure machine communicate in main steam conduit, the steam outlet of the second passageway of heat exchanger communicate in outside heating system, the exhanst gas outlet of boiler body communicate in the boiler flue.

Through the technical scheme, this back pressure machine steam exhaust temperature regulation apparatus that this disclosure provided promptly, through the first passageway that communicates the steam vent with the back pressure machine in the heat exchanger through first steam transmission pipeline, and communicate the boiler flue in the second passageway of heat exchanger, thus, make the high temperature boiler flue gas that the boiler body produced flow to the second passageway of heat exchanger and carry out the heat exchange in this heat exchanger with the steam of the steam vent exhaust of back pressure machine via the boiler flue, thereby can realize heating the steam in the first passageway of flow through the heat exchanger, and carry the steam after will heating to outside heating system through second steam transmission pipeline, so as to can satisfy the heat supply demand in places such as industrial user or house, guaranteed under the unaffected circumstances of the design efficiency of back pressure machine, still can be along the heat supply demand that satisfies places such as industrial user or house, in order to do benefit to guarantee back pressure machine efficient operation, high suitability and stability are good. Meanwhile, through heat exchange between the high-temperature boiler flue gas and the steam discharged by the back pressure machine, the recycling of energy in the boiler flue gas is realized, the energy loss is reduced, and the heat economy is high.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic structural diagram of a heating system of a thermal generator set provided in an exemplary embodiment of the present disclosure;

fig. 2 is a schematic structural view of a heat exchanger provided in an exemplary embodiment of the present disclosure.

Description of the reference numerals

1-back press; 110-steam inlet; 120-steam exhaust port; 2-boiler flue; 210-a first pipe section; 211-a fourth isolation valve; 220-a second pipe section; 221-a fifth isolation valve; 230-a third tube segment; 231-a sixth isolation valve; 3-a heat exchanger; 310-a first core; 311-a first channel; 320-a second channel; 330-a housing; 4-a first steam delivery pipe; 410-a first branch; 411 — first isolation valve; 420-a second branch; 421-a second isolation valve; 430-a first non-return valve; 5-a second steam delivery pipeline; 510-a third isolation valve; 6-external heating system; 7-auxiliary electric heater; 8-a plant power system; 9-a boiler body; 10-a main turbine; 11-a main steam line; 12-a flue gas purification system; 13-steam extraction pipe; 14-seventh isolation valve.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, "inner and outer" refer to inner and outer relative to the contour of the component or structure itself. In addition, it should be noted that terms such as "first", "second", and the like are used for distinguishing one element from another, and have no order or importance. In addition, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.

The inventor researches and discovers that in the related art, in order to guarantee the deep peak regulation requirement of a thermal power generating unit, the low-load operation of the unit becomes a normal state, for example, when the generating unit is in a low-electric load, the flow rate of steam entering a main steam turbine 10 from a boiler body 9 through a main steam pipeline 11 is correspondingly reduced, steam parameters are reduced, steam extraction parameters of the main steam turbine 10 are reduced, and a steam source of a steam inlet of a backpressure machine 1 is usually extracted from the main steam pipeline 11 or the main steam turbine 10, so that when the steam extraction parameters are reduced, the steam inlet parameters entering the backpressure machine 1 are reduced, the steam exhaust temperature of the backpressure machine 1 may possibly fail to meet the heat supply requirements of industrial users or houses, and therefore, the design efficiency of the backpressure machine 1 has to be reduced so as to meet the heat supply requirements of industrial users or houses in a wide-load operation range, and the problem that the steam exhaust temperature of the backpressure machine 1 is too low to cause the failure to meet the user requirements is avoided, but the reduction of the design efficiency of the backpressure machine 1 may cause the backpressure machine 1 to fail to operate efficiently, and the overall applicability is poor.

Based on this, according to a first aspect of the present disclosure, there is provided a backpressure machine exhaust steam temperature regulating device, as shown in fig. 1 and fig. 2, comprising a backpressure machine 1, a boiler flue 2 and a heat exchanger 3, wherein the backpressure machine 1 is provided with a steam inlet 110 for steam to enter and a steam outlet 120 for steam to exhaust; the boiler flue 2 is communicated with a flue gas outlet of the boiler body 9; the heat exchanger 3 comprises a first core 310, a first channel 311 for circulating steam is arranged in the first core 310, a second channel 320 for circulating boiler flue gas to exchange heat with steam is arranged outside the first core 310, a steam inlet of the first channel 311 is communicated with the steam outlet 120 through a first steam conveying pipeline 4, a steam outlet of the first channel 311 is communicated with an external heat supply system 6 through a second steam conveying pipeline 5, and the second channel 320 is communicated with the boiler flue 2.

Through the technical scheme, that is, the backpressure machine exhaust steam temperature adjusting device provided by the disclosure, the exhaust steam port 120 of the backpressure machine 1 is communicated with the first channel 311 of the heat exchanger 3 through the first steam transmission pipeline 4, and the boiler flue 2 is communicated with the second channel 320 of the heat exchanger 3, so that high-temperature boiler flue gas generated by the boiler body 9 flows into the second channel 320 of the heat exchanger 3 through the boiler flue 2 and exchanges heat with steam exhausted from the exhaust steam port 120 of the backpressure machine 1 in the heat exchanger 3, thereby being capable of heating steam flowing through the first channel 311 of the heat exchanger 3, and delivering the heated steam to the external heating system 6 through the second steam transmission pipeline 5, so as to meet the heating requirements of places such as industrial users or houses, and under the condition that the design efficiency of the backpressure machine 1 is not affected, the heating requirements of industrial users or houses can still be met, so as to be beneficial to guarantee the efficient operation of the backpressure machine 1, and the backpressure machine is high in applicability and good in stability. Meanwhile, the energy in the boiler flue gas is recycled through the heat exchange between the high-temperature boiler flue gas and the steam discharged by the back press 1, the energy loss is reduced, and the heat economy is high.

In consideration of that the boiler flue gas flow rate has certain fluctuation, and meanwhile, the heat exchange between the steam and the boiler flue gas in the heat exchanger 3 also generates certain instability along with the influence of factors such as parameter changes of a steam flow meter, and the like, in some embodiments, referring to fig. 1, the backpressure machine exhaust steam temperature adjusting device may further include an auxiliary electric heater 7, and the auxiliary electric heater 7 is arranged on the heat exchanger 3 to be used for auxiliary heating of the steam flowing through the first channel 311, so that the steam temperature can be adaptively adjusted through the auxiliary electric heater 7, and stable heat supply for industrial users or residential sites and the like can be ensured. It should be noted that, when the boiler body 9 has a smoke discharge fault, for example, so that the boiler smoke cannot exchange heat with steam in the heat exchanger 3, the steam can be heated only by the auxiliary electric heater 7 to continuously ensure that the steam supply temperature meets the user requirement, and the boiler smoke side is gradually put into a normalized running state as a main heat source after the boiler smoke side maintenance operation is completed.

In addition, in some embodiments, referring to fig. 1, the auxiliary electric heater 7 may be electrically connected to the plant electric system 8, so that an operator adaptively adjusts output electric power of the plant electric system 8 according to an actual steam supply temperature requirement, thereby ensuring continuous and stable power supply for the auxiliary electric heater 7, and simultaneously reducing a load on a generator set, and performing deep peak shaving on the auxiliary set, which is good in applicability and high in stability.

The auxiliary electric heater 7 may be configured in any suitable manner, for example, in some embodiments, as shown in fig. 2, the auxiliary electric heater 7 may be configured as a resistance wire heater disposed in the first passage 311, so that after the steam is delivered into the first passage 311, the steam can be heated through a temperature control tube disposed outside a resistance wire of the resistance wire heater, such as a coil spring, and the structure is simple and the stability is high. The connection mode and the specific structure of the resistance wire heater and the first channel 311 can be adaptively designed according to actual needs, and the purpose is to heat the steam in the first channel 311 through the resistance wire heater, and a person skilled in the art can select any known resistance wire heater according to actual conditions, and the disclosure is not limited specifically herein.

In some embodiments, referring to fig. 1, the first steam transmission pipeline 4 may include a first branch 410 and a second branch 420 connected in parallel, the first branch 410 and the second branch 420 are respectively communicated with the steam inlet of the first channel 311 and the second steam transmission pipeline 5, the first branch 410 is provided with a first isolation valve 411, and the second branch 420 is provided with a second isolation valve 421, so that when the exhaust temperature of the backpressure unit 1 can meet the requirement of user heat supply, the steam can be transmitted only through the second branch 420.

And, when the exhaust steam temperature of the back press 1 cannot meet the heat supply requirement of the user, the steam can be conveyed only through the first branch 410, and at the same time, the steam is conveyed into the heat exchanger 3 to realize the heat exchange with the boiler flue gas, and then the heated steam is conveyed to the external heat supply system 6, at this time, when the heat exchanger 3 breaks down, an operator can also close the first isolation valve 411 on the first branch 410 in an operable manner, the steam is conveyed temporarily through the second branch 420, so that the external heat supply system 6 can continue to work normally, time is won for the maintenance operation of the heat exchanger 3, after the maintenance operation of the heat exchanger 3 is completed, the first isolation valve 411 can be opened in an operable manner, and the second isolation valve is closed, so that the heat exchange between the steam and the boiler flue gas is continuously realized through the heat exchanger 3, and the heated steam is conveyed to the external heat supply system 6 to meet the heat supply requirement of the industrial user or the residence and other places 421. The first isolation valve 411 and the second isolation valve 421 may be controlled by, for example, a manual control method or, for example, an upper computer automatic control method, so as to achieve corresponding opening and closing of the valve body, which is not limited in this disclosure.

Further, in some embodiments, referring to fig. 1, a first check valve 430 may be further disposed on the first steam delivery pipe 4, and the first check valve 430 is located near an end where the steam outlet 120 of the back press 1 is located and upstream of a connection between the first branch 410 and the second branch 420, so as to prevent backflow of steam discharged from the steam outlet 120 of the back press 1, so as to ensure stable operation of the temperature adjustment device. It should be noted that fig. 1 and fig. 2 both show the flow direction of the steam and the flow direction of the boiler flue gas by way of example, wherein the thick arrows indicate the flow direction of the steam, and the thin arrows indicate the flow direction of the boiler flue gas.

In addition, in some embodiments, referring to fig. 1, a third isolation valve 510 may be further disposed on the second steam transmission pipeline 5, and the third isolation valve 510 is located at an end close to the steam outlet of the first channel 311 and located upstream of the connection between the second branch 420 and the second steam transmission pipeline 5, so that when an operator performs maintenance operation on the heat exchanger 3, the third isolation valve 510 on the second steam transmission pipeline 5 and the first isolation valve 411 on the first branch 410 are both in a closed state, which can effectively avoid the problem of steam leakage, ensure that the operator performs the maintenance operation safely, and simultaneously ensure that when the exhaust steam of the backpressure unit 1 is transmitted to the external heat supply system 6 via the second branch 420 of the first steam transmission pipeline 4, the steam is prevented from flowing back into the heat exchanger 3. The third isolation valve 510 may be controlled by, for example, a manual control method or, for example, an upper computer automatic control method, so as to achieve the corresponding opening and closing of the valve body, which is not limited in this disclosure.

In addition, in some embodiments, referring to fig. 1, the boiler flue 2 may include a first pipe section 210 and a second pipe section 220, the first pipe section 210 is communicated with the flue gas inlet of the second channel 320, the second pipe section 220 is communicated with the flue gas outlet of the second channel 320, and the first pipe section 210 and the second pipe section 220 are respectively provided with a fourth isolation valve 211 and a fifth isolation valve 221, so that when the heat exchanger 3 is subjected to maintenance operation, an operator can close the fourth isolation valve 211 and the fifth isolation valve 221, and the safety of the operator can be further ensured, and the operator is prevented from being scalded by the leakage of the flue gas of the high temperature boiler.

Meanwhile, in order to ensure that the boiler flue gas in the boiler flue 2 can be normally discharged into, for example, the flue gas purification system 12 when the heat exchanger 3 is in maintenance, a third pipe section 230 may be further communicated between the first pipe section 210 and the second pipe section 220, a connection of the third pipe section 230 and the first pipe section 210 is located upstream of the fourth isolation valve 211, and a connection of the third pipe section 230 and the second pipe section 220 is located downstream of the fifth isolation valve 221, so that the boiler flue gas can be conveyed into the flue gas purification system 12 through the third pipe section 230 when the heat exchanger 3 is in maintenance. And a sixth isolation valve 231 is provided on the third pipe section 230 to be able to operatively control the opening or closing of the third pipe section 230. The fourth isolation valve 211, the fifth isolation valve 221, and the sixth isolation valve 231 may all be controlled by, for example, a manual control method or, for example, an upper computer automatic control method, so as to achieve corresponding opening and closing of the valve body, which is not specifically limited in this disclosure. In addition, in some embodiments, not shown, a second check valve may also be disposed on the first pipe section 210 and upstream of the fourth isolation valve 211 to prevent backflow of the boiler flue gas.

The heat exchanger 3 may be configured in any suitable manner according to practical applications, for example, in some embodiments, the heat exchanger 3 may be configured as a tube type heat exchanger, specifically, as shown in fig. 2, the heat exchanger 3 may include a housing 330, a plurality of first cores 310 are arranged at intervals in the housing 330, gaps between the plurality of first cores 310 are formed as second channels 320, so as to enable stable heat exchange between steam and boiler flue gas in the tube type heat exchanger, and the first channels 311 and the second channels 320 are arranged perpendicular to each other, so that space utilization is good, and heat exchange efficiency is high. Of course, in some embodiments not shown in the drawings, the heat exchanger 3 may be configured as a plate heat exchanger or other heat exchangers, and the present disclosure is not limited thereto.

According to a second aspect of the present disclosure, a heating system of a thermal generator set is further provided, and as shown in fig. 1, the heating system includes a boiler body 9, a main steam turbine 10, a main steam pipeline 11, an external heating system 6, and the back pressure machine exhaust steam temperature adjusting device, a steam outlet of the boiler body 9 is communicated with a steam inlet of the main steam turbine 10 through the main steam pipeline 11, a steam inlet 110 of the back pressure machine 1 is communicated with the main steam pipeline 11, a steam outlet of the second channel 320 of the heat exchanger 3 is communicated with the external heating system 6, and a flue gas outlet of the boiler body 9 is communicated with the boiler flue 2. This thermal generator set heating system is through being provided with this backpressure machine steam extraction temperature regulation apparatus, can make even when generating set is in low electric load state, when leading to backpressure machine 1's admission parameter to reduce, still can make backpressure machine 1's steam extraction be used for satisfying heat supply demands such as industrial user or house, can also guarantee simultaneously that backpressure machine 1 moves high-efficiently. In addition, this thermal generator set heating system has all beneficial effects of above-mentioned backpressure machine exhaust steam temperature adjusting device, and this disclosure need not be repeated here.

Based on the above embodiment, the present disclosure exemplarily describes the working process of the heating system of the thermal generator set, which is as follows: it should be noted that, for convenience of description, the steam inlet 110 of the back press 1 is set to be communicated with the main steam pipeline 11 through the steam extraction pipeline 13, and the steam extraction pipeline 13 is provided with the seventh isolation valve 14, and the isolation valves on the pipelines are all in a closed state;

when the generator set is in a high electric load, the steam inlet parameter of the back pressure machine 1 is high, the steam exhaust temperature of the back pressure machine 1 can meet the heat supply requirements of industrial users or houses and the like, and at the moment, the seventh isolation valve 14, the second isolation valve 421 and the sixth isolation valve 231 are opened, so that part of steam generated by the boiler body 9 passes through the main steam pipeline 11-the main steam turbine 10; the other part is used for meeting the heat supply requirements of industrial users or houses and the like through the steam extraction pipeline 13, the back pressure machine 1, the second branch 420 of the first steam transmission pipeline 4, the second steam transmission pipeline 5 and the external heat supply system 6; meanwhile, boiler flue gas generated by the boiler body 9, the boiler flue 2, the third pipe section 230 and the flue gas purification system 12.

When the generator set is in a low electric load, the steam inlet parameter of the back pressure machine 1 is low, the steam exhaust temperature of the back pressure machine 1 cannot meet the heat supply requirements of industrial users or houses and the like, at the moment, the second isolation valve 421 and the sixth isolation valve 231 are closed, and the first isolation valve 411, the third isolation valve 510, the fourth isolation valve 211 and the fifth isolation valve 221 are correspondingly opened, so that part of steam generated by the boiler body 9 passes through the main steam pipeline 11-the main steam turbine 10; the other part is extracted through a steam extraction pipeline 13, the back pressure machine 1, a first branch 410 of a first steam transmission pipeline 4, a first channel 311 of a heat exchanger 3, a second steam transmission pipeline 5 and an external heating system 6; meanwhile, the boiler flue gas generated by the boiler body 9, the boiler flue 2, the first pipe section 210, the second channel 320 of the heat exchanger 3 and the flue gas purification system 12 exchange heat with the boiler flue gas in the heat exchanger 3, so that the steam is heated, and the heated steam is conveyed to the external heat supply system 6 through the second steam conveying pipeline 5, so that the heat supply requirements of industrial users or houses and other places can be met. In addition, it should be noted that, because the flow rate of the flue gas of the boiler in the early stage has a certain fluctuation, in order to enable the steam temperature to rapidly meet the heat supply requirement, the auxiliary electric heater 7 can be started to adaptively adjust the steam temperature, and after the flow rate of the flue gas of the boiler is stable, the flue gas side of the boiler is used as a main heat source to be in a normalized operation state.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. The utility model provides a backpressure machine steam extraction temperature regulation apparatus which characterized in that includes:

the back press is provided with a steam inlet for steam to enter and a steam outlet for steam to discharge;

the boiler flue is used for being communicated with the smoke outlet of the boiler body;

the heat exchanger comprises a first core body, wherein a first channel for supplying steam to circulate is arranged in the first core body, a second channel for allowing boiler flue gas to flow through and exchanging heat with steam is arranged outside the first core body, a steam inlet of the first channel is communicated with the steam exhaust port through a first steam conveying pipeline, a steam outlet of the first channel is communicated with an external heating system through a second steam conveying pipeline, and the second channel is communicated with the boiler flue.

2. The backpressure machine exhaust steam temperature regulation device of claim 1, further comprising an auxiliary electric heater arranged on the heat exchanger for auxiliary heating of steam flowing through the first channel.

3. The backpressure machine exhaust steam temperature regulation device of claim 2, wherein the auxiliary electric heater is electrically connected with a service power system.

4. The backpressure machine exhaust steam temperature regulation device of claim 2, wherein the auxiliary electric heater is configured as a resistance wire heater disposed within the first channel.

5. The backpressure machine exhaust steam temperature regulation device of claim 1, wherein the first steam delivery pipeline comprises a first branch and a second branch which are connected in parallel, and the first branch and the second branch are respectively communicated with the steam inlet of the first channel and the second steam delivery pipeline;

and a first isolating valve is arranged on the first branch, and a second isolating valve is arranged on the second branch.

6. The steam exhaust temperature adjusting device of the backpressure machine as claimed in claim 5, wherein the first steam transmission pipeline is further provided with a first check valve, and the first check valve is located at one end close to the steam exhaust port of the backpressure machine and upstream of the connection of the first branch and the second branch.

7. The backpressure machine exhaust steam temperature regulation device of claim 5, wherein the second steam transmission pipeline is further provided with a third isolation valve, and the third isolation valve is located at one end close to the steam outlet of the first channel and upstream of the connection of the second branch and the second steam transmission pipeline.

8. The backpressure machine exhaust steam temperature regulating device according to claim 5, wherein the boiler flue comprises a first pipe section and a second pipe section, the first pipe section is communicated with the flue gas inlet of the second channel, the second pipe section is communicated with the flue gas outlet of the second channel, and a fourth isolation valve and a fifth isolation valve are respectively arranged on the first pipe section and the second pipe section;

a third pipe section is communicated between the first pipe section and the second pipe section, the connection position of the third pipe section and the first pipe section is located at the upstream of the fourth isolation valve, the connection position of the third pipe section and the second pipe section is located at the downstream of the fifth isolation valve, and a sixth isolation valve is arranged on the third pipe section.

9. The backpressure machine exhaust steam temperature regulation device according to any one of claims 1-8, wherein the heat exchanger is configured as a tubular heat exchanger and comprises a shell, a plurality of first cores are arranged in the shell at intervals, gaps among the first cores are formed into the second channel, and the first channel and the second channel are arranged perpendicular to each other.

10. A thermal generator set heating system is characterized by comprising a boiler body, a main steam turbine, a main steam pipeline, an external heating system and the backpressure machine steam exhaust temperature adjusting device according to any one of claims 1 to 9, wherein a steam outlet of the boiler body is communicated with a steam inlet of the main steam turbine through the main steam pipeline, a steam inlet of the backpressure machine is communicated with the main steam pipeline, a steam outlet of a second channel of the heat exchanger is communicated with the external heating system, and a smoke outlet of the boiler body is communicated with a boiler flue.

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