CN215061999U - Normal operation system of boiler air heater in emergency heat supply mode of heat supply unit - Google Patents
Normal operation system of boiler air heater in emergency heat supply mode of heat supply unit Download PDFInfo
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- CN215061999U CN215061999U CN202121319560.5U CN202121319560U CN215061999U CN 215061999 U CN215061999 U CN 215061999U CN 202121319560 U CN202121319560 U CN 202121319560U CN 215061999 U CN215061999 U CN 215061999U
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Abstract
The utility model discloses a normal operation system of a boiler air heater in an emergency heat supply mode of a heat supply unit, which comprises a boiler, a steam turbine, a condenser, a deaerator, a high-pressure heater, an air heater group and a heat supply network heater; a steam outlet of the boiler is respectively connected with an inlet of the high-pressure cylinder and an inlet of the first temperature and pressure reducing valve, an outlet of the boiler is converged with an outlet of the high-pressure cylinder and then connected with an inlet of a reheater of the boiler, reheated steam enters the heater unit through the second temperature and pressure reducing valve, and drain water of the heater unit returns to the deaerator; under an emergency heat supply mode, a hot water-cold air shell-and-tube heat exchanger is additionally arranged, and the initial temperature rise of cold air at the outlet of a fan is realized by utilizing the drainage waste heat of a heat supply network heater; and the steam at the outlet of the boiler reheater is used as a secondary temperature raising heat source of the steam air heater, so that the normal operation of the boiler air heater in an emergency heat supply state is ensured, the low-temperature corrosion risk caused by the reduction of the exhaust smoke temperature of the heating surface at the tail part of the boiler is avoided, and the safe and reliable operation of the boiler is realized.
Description
Technical Field
The utility model belongs to the combined heat and power generation field, especially, boiler fan heater normally throws fortune system under emergent heat supply mode of heat supply unit.
Background
For the heat supply type steam turbine, one machine is preferably provided with one furnace, when one steam boiler with the largest capacity is stopped, if the external steam supply capacity of the other boilers cannot meet the requirements of 100 percent of production steam consumption and 60 to 75 percent (the upper limit is taken in severe cold regions) of winter heating, ventilation and domestic heat required by continuous production of thermal users, other standby heat sources are configured by a heat supply network. When equipment such as a steam turbine and a generator of a heat supply unit breaks down in a heat supply period and needs to be overhauled, the problems that heat supply does not reach the standard or heat supply stops, steam supply stops and the like can be caused, heating feeling of residents is influenced, production loss of enterprises is caused, and social influence is large.
The coal-fired heat supply unit stops and does not shut down the stove and meet an urgent need to supply heat to the operating mode, the coal-fired generating set generator power drops to zero, follow the principle of heat conservation, the heat that the boiler releases is used for heating the water supply except giving the thermodynamic system, all the other are used for external heating heat supply. The main steam, cold re-steam, hot re-steam and heating steam pipeline steam parameters and the through-flow capacity are limited, and the boiler load is lower under the condition that the unit stops and does not stop, and is about 20-40% of the rated load. In the residential heating season, the temperature of the external environment is low, the temperature is more than minus 10 ℃ in low-temperature periods at night, in order to prevent the damage of low-temperature corrosion on the heating surface at the tail of the boiler, the coal-fired power stations are provided with air heaters which are arranged in air ducts at the outlet of a fan of the boiler and the inlet of an air preheater, and a heat source generally takes the value of steam extraction in a steam turbine. In an emergency heat supply working condition, the steam turbine does not enter steam, and at the moment, the air heater does not heat a steam source, so that the heated surface at the tail part of the boiler is damaged by low-temperature corrosion, equipment is damaged, and the long-term safe and reliable operation of power station equipment is not facilitated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the problem among the prior art, provide a boiler fan heater normally throws shipping system under the emergent heat supply mode of heat supply unit.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a normal operation system of a boiler air heater in an emergency heat supply mode of a heat supply unit comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a deaerator, a high-pressure heater group, a heat supply network heater and an air heater group; one path of exhaust steam of the boiler superheater enters a high-pressure cylinder to do work, and the other path of exhaust steam enters a first temperature and pressure reducing valve; the exhaust steam of the high-pressure cylinder is merged with the exhaust steam of the first temperature and pressure reducing valve through a cold re-steam main pipe and then divided into three paths, wherein one path returns to the boiler, the other path enters the high-pressure heater group, and the other path enters the deaerator; one path of the reheating steam of the boiler respectively enters a heater unit and a heating steam main pipe through a second temperature and pressure reducing valve, and the other path of the reheating steam enters a middle pressure cylinder for acting; the steam of the fan heater group returns to the connecting boiler; one path of exhaust steam of the intermediate pressure cylinder enters a heating network heater, and the other path of exhaust steam enters the low pressure cylinder; the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are coaxially connected with the engine, exhaust steam of the low-pressure cylinder enters the condenser, and condensed water of the condenser enters the deaerator after being boosted; one path of the drainage water of the heat supply network heater enters a second temperature and pressure reducing valve, and the other path of the drainage water of the heat supply network heater is converged with the drainage water of the heater unit and then enters a deaerator; and the deaerated water of the deaerator passes through the high-pressure heater group, one path of deaerated water enters the boiler, and the other path of deaerated water enters the first temperature and pressure reducing valve.
The utility model discloses a further improvement lies in:
the air heater group comprises a hot water air heater and a steam air heater, a steam inlet of the steam air heater is connected with a second temperature and pressure reducing valve, a steam outlet is connected with a boiler, a drain outlet is connected with the hot water air heater, and an outlet of the hot water air heater is connected with a deaerator.
The inlets of the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder are respectively provided with a high pressure cylinder steam inlet adjusting valve, an intermediate pressure cylinder air inlet adjusting valve and a heat supply butterfly valve; the outlet of the high pressure cylinder is provided with a high discharge check valve; the intermediate pressure cylinder is connected with the heating network heater through a heating steam extraction regulating valve.
The outlet of the intermediate pressure cylinder is connected with a deaerator through a first valve set.
A steam source inlet of the high-pressure heater group and a steam source inlet of the deaerator are respectively provided with a second valve group and a third valve group; the water outlet of the high-pressure heater group is connected with a first temperature and pressure reducing valve through a fourth valve group; the drain outlet of the high-pressure heater group is connected with a deaerator.
The high-pressure heater group comprises a first high-pressure heater, a second high-pressure heater and a third high-pressure heater which are sequentially connected, and drain water of the third high-pressure heater sequentially passes through the second high-pressure heater and the first high-pressure heater and enters the deaerator; the first high-pressure heater group is connected with the deaerator, and the third high-pressure heater is respectively connected with the boiler and the first temperature and pressure reducing valve.
And a drain outlet of the heat supply network heater is provided with a drain pump, and the drain pump is connected with a second temperature and pressure reducing valve through a fifth valve set.
And a heat supply network circulating water pump set is also arranged at the inlet of the heat supply network heater.
The outlet of the condenser is connected with the inlet of a condensate pump, and the outlet of the condensate pump is connected with the inlet of a deaerator; the outlet of the deaerator is connected with the inlet of a water feed pump set, and the outlet of the water feed pump set is connected with the inlet of a high-pressure heater set.
The hot water air heater is of a shell-and-tube structure.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a boiler heater normal operation system under heat supply unit emergency heating mode, when one or both of coal-fired heat supply unit steam turbine, generator broke down, the new steam of boiler superheater export gets into cold vapor main pipe again and gets back to the boiler re-heater secondary and raises the temperature after the first temperature reduction relief valve cooling step-down to avoid the boiler re-heater overtemperature, make boiler wall temperature in safe scope; meanwhile, a hot water air heater is additionally arranged in an air duct at the inlet of the air preheater and in front of an original steam air heater, the primary temperature raising of cold air at the outlet of the air heater is realized by utilizing the drain waste heat of a heat supply network heater and the steam air heater, the exhausted steam at the outlet of a boiler reheater passes through a second temperature-reducing pressure-reducing valve and then is used as a secondary temperature raising heat source of the steam air heater, and the two heat sources jointly act to ensure the normal operation of the boiler air heater and avoid the risk of low-temperature corrosion of a heated surface at the tail part of the boiler caused by the reduction of the exhaust smoke temperature; in addition, the drained water after heat exchange enters the high-pressure heater group to be heated again after being deoxidized and preliminarily heated by the deaerator, and finally enters the boiler, so that the normal running of the water feeding of the boiler is ensured, wherein the drained water of the high-pressure heater group returns to the deaerator again, the deaerator is continuously deoxidized and heated, and the drained water is recycled. The boiler safety and reliability operation of the coal-fired heat supply unit under the external heat supply state can be ensured even if the steam turbine or the generator fails.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is the schematic diagram of the normal operation system of the boiler air heater in the emergency heating mode of the heating unit.
Wherein: 1-a boiler; 2-high pressure cylinder; 3-a medium pressure cylinder; 4-low pressure cylinder; 5-a generator; 6-a condenser; 7-a condensate pump; 8-a deaerator; 9-a water feed pump set; 10-a first high pressure heater; 11-a second high pressure heater; 12-a third high pressure heater; 13-a heat supply network circulating water pump group; 14-a heating network heater; 15-a hydrophobic pump; 16-hot water air heater; 17-steam air heater; 18-a high-pressure cylinder steam inlet adjusting valve; 19-a middle pressure cylinder steam inlet adjusting valve; 20-heat supply butterfly valve; 21-heating steam extraction regulating valve; 22-high discharge check valve; 23-a first valve group; 24-a second valve set; 25-a third valve group; 26-fourth valve group; 27-a first temperature and pressure reducing valve; 28-a second temperature and pressure reducing valve; 29-fifth valve set; 30-sixth valve group.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, a normal operation system of a boiler air heater in an emergency heating mode of a heating unit includes a boiler 1, a high-pressure cylinder 2, a pressure pump 3, a low-pressure cylinder 4, a condenser 6, a deaerator 8, a high-pressure heater group, a heating network heater 14 and a heater group;
one path of the exhaust steam of the superheater of the boiler 1 enters the high-pressure cylinder 2 to do work, and the other path of the exhaust steam enters the first temperature and pressure reducing valve 27; the exhaust steam of the high-pressure cylinder 2 is merged with the exhaust steam of the first temperature and pressure reducing valve 27 through a cold re-steam main pipe and then divided into three paths, wherein one path returns to the boiler 1, the other path enters the high-pressure heater group, and the other path enters the deaerator 8; one path of the reheated steam of the boiler 1 respectively enters the heater unit and the heating steam main pipe through a second temperature and pressure reducing valve 28, the other path of the reheated steam enters the intermediate pressure cylinder 3 to do work, and the reheated steam of the boiler 1 enters the heating steam main pipe through a sixth valve group 30 after passing through the second temperature and pressure reducing valve 28; the steam of the air heater group returns to the connecting boiler 1; one path of exhaust steam of the intermediate pressure cylinder 3 enters the heating network heater 14, and the other path of exhaust steam enters the low pressure cylinder 4; the high-pressure cylinder 2, the intermediate-pressure cylinder 3, the low-pressure cylinder 4 and the engine 5 are coaxially connected, exhaust steam of the low-pressure cylinder 4 enters the condenser 6, and condensed water of the condenser 6 enters the deaerator 8 after being boosted; one path of the drainage water of the heat supply network heater 14 enters a second temperature and pressure reducing valve 28, and the other path of the drainage water of the air heater group is converged with the drainage water of the air heater group and then enters the deaerator 8; the deaerated water of the deaerator 8 passes through a high-pressure heater group, one path of the deaerated water enters the boiler 1, and the other path of the deaerated water enters the first temperature and pressure reducing valve 27.
The air heater group comprises a hot water air heater 16 and a steam air heater 17, a steam inlet of the steam air heater 17 is connected with a second temperature and pressure reducing valve 28, a steam outlet is connected with the boiler 1, a drain outlet is connected with the hot water air heater 16, and an outlet of the hot water air heater 16 is connected with the deaerator 8.
The high pressure cylinder 2, the intermediate pressure cylinder 3 and the low pressure cylinder 4 are respectively provided with a high pressure cylinder steam inlet adjusting valve 18, an intermediate pressure cylinder steam inlet adjusting valve 19 and a heat supply butterfly valve 20 at the inlet, and the intermediate pressure cylinder 3 is connected with a heat supply network heater 14 through a heat supply steam extraction adjusting valve 21. The outlet of the intermediate pressure cylinder 3 is connected with a deaerator 8 through a first valve group 23. A steam source inlet of the high-pressure heater group and a steam source inlet of the deaerator 8 are respectively provided with a second valve group 24 and a third valve group 25; the water outlet of the high-pressure heater group is connected with a first temperature and pressure reducing valve 27 through a fourth valve group 26; the drain outlet of the high-pressure heater group is connected with a deaerator 8.
The high-pressure heater group comprises a first high-pressure heater 10, a second high-pressure heater 11 and a third high-pressure heater 12, a drain outlet of the third high-pressure heater 12 is connected with a drain inlet of the second high-pressure heater 11, a drain outlet of the second high-pressure heater 11 is connected with a drain inlet of the first high-pressure heater 10, and a drain outlet of the first high-pressure heater 10 is connected with a deaerator 8.
The drain outlet of the heating network heater 14 is provided with a drain pump 15, and the drain pump 15 is connected with a second temperature and pressure reducing valve 28 through a fifth valve group 29. A heat supply network circulating water pump set 13 is also arranged at the inlet of the heat supply network heater 14. The outlet of the condenser 6 is connected with the inlet of a condensate pump 7, and the outlet of the condensate pump 7 is connected with the inlet of a deaerator 8. The outlet of the deaerator 8 is connected with the inlet of the water feed pump set 9, and the outlet of the water feed pump set 9 is connected with the inlet of the high-pressure heater set. The hot water air heater 16 is of a shell-and-tube structure, hot water is connected in the tube, and air is connected on the shell side.
The utility model discloses a working process:
when one or both of a steam turbine and a generator of the coal-fired heat supply unit are in failure, the unit starts an emergency heat supply mode to supply heat to the outside in a centralized way: the high-pressure cylinder steam inlet adjusting valve 18, the intermediate-pressure cylinder steam inlet adjusting valve 19, the heat supply butterfly valve 20, the high-exhaust check valve 22 and the first valve group 23 of the steam inlet pipeline of the deaerator 8 are closed, and the valve groups 24, 25, 26, 29 and 30 and the temperature and pressure reducing valves 27 and 28 are opened. And (3) stopping the high-pressure cylinder 2, the intermediate-pressure cylinder 3, the low-pressure cylinder 4, the generator 5, the condenser 6 and the condensate pump 7 of the steam turbine. The steam air heater 17 and the hot water air heater 16 are normally operated.
The steam at the outlet of the superheater of the boiler 1 enters a cold re-steam pipeline through a first temperature and pressure reducing valve 27, and the temperature reducing water is provided by the outlet of the third high-pressure heater 12. One part of the cold re-steam is supplied to the second high-pressure heater 11 and the deaerator 8, and the other part of the cold re-steam enters the boiler 1, so that the overtemperature of the boiler 1 is avoided; after the steam at the outlet of the reheater of the boiler 1 passes through the second temperature and pressure reducing valve 28, one path of the steam enters a plant heating steam main pipe through a sixth valve group 30, and the other path of the steam enters a steam air heater 17; at the moment, the drained water of the heat supply network heater is boosted by a drain pump 15 and then converged with the drained water of a steam air heater 17, the drained water and the drained water jointly enter a hot water air heater 16 for heat exchange, the cooled drained water enters a water side inlet of a deaerator 8 for deaerating and primary heating, hidden danger caused by the fact that water with oxygen enters a boiler 1 is avoided, the deaerated water is pressurized and then conveyed to a high-pressure heater group to achieve step heating, a heating source is taken from cold re-steam conveyed by a first temperature and pressure reducing valve 27, at the moment, a second valve group 24 and a third valve group 25 are in an opening state, the drained water of the high-pressure heater group returns to the deaerator 8, and the recycling of the drained water is guaranteed; cold air at the outlet of the fan sequentially enters the hot water air heater 16 and the steam air heater 17, the cold air enters the boiler 1 after being subjected to cascade heat absorption, and the heat source is the drainage of the heat supply network heater 14 and the reheat steam of the boiler 1, so that the damage of low-temperature corrosion on the heated surface at the tail part of the boiler to equipment damage is avoided.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A normal operation system of a boiler air heater in an emergency heat supply mode of a heat supply unit is characterized by comprising a boiler (1), a high-pressure cylinder (2), a medium-pressure cylinder (3), a low-pressure cylinder (4), a condenser (6), a deaerator (8), a high-pressure heater group, a heat supply network heater (14) and an air heater group;
one path of the exhaust steam of the superheater of the boiler (1) enters a high-pressure cylinder (2) to do work, and the other path of the exhaust steam enters a first temperature and pressure reducing valve (27); the exhaust steam of the high-pressure cylinder (2) is merged with the exhaust steam of the first temperature and pressure reducing valve (27) through a cold re-steam main pipe and then divided into three paths, wherein one path returns to the boiler (1), the other path enters the high-pressure heater group, and the other path enters the deaerator (8); one path of reheated steam of the boiler (1) respectively enters a heater unit and a heating steam main pipe through a second temperature and pressure reducing valve (28), and the other path of reheated steam enters an intermediate pressure cylinder (3) to do work; the steam of the air heater group returns to the connecting boiler (1);
one path of exhaust steam of the intermediate pressure cylinder (3) enters a heat supply network heater (14), and the other path of exhaust steam enters the low pressure cylinder (4); the high-pressure cylinder (2), the medium-pressure cylinder (3), the low-pressure cylinder (4) and the engine (5) are coaxially connected, exhaust steam of the low-pressure cylinder (4) enters the condenser (6), and condensed water of the condenser (6) enters the deaerator (8) after being pressurized;
one path of the drainage water of the heat supply network heater (14) enters a second temperature and pressure reducing valve (28), and the other path of the drainage water of the heat supply network heater and the drainage water of the fan heater group are converged and then enter a deaerator (8);
the deaerated water of the deaerator (8) passes through the high-pressure heater group, enters the boiler (1) on one way, and enters the first temperature and pressure reducing valve (27) on the other way.
2. The system for normally operating the boiler air heater in the emergency heating mode of the heating unit according to claim 1, wherein the air heater group comprises a hot water air heater (16) and a steam air heater (17), a steam inlet of the steam air heater (17) is connected with the second temperature and pressure reducing valve (28), a steam outlet is connected with the boiler (1), a hydrophobic outlet is connected with the hot water air heater (16), and an outlet of the hot water air heater (16) is connected with the deaerator (8).
3. The system for normally operating the boiler air heater in the emergency heating mode of the heating unit according to claim 1, wherein inlets of the high-pressure cylinder (2), the intermediate-pressure cylinder (3) and the low-pressure cylinder (4) are respectively provided with a high-pressure cylinder steam inlet regulating valve (18), an intermediate-pressure cylinder steam inlet regulating valve (19) and a heating butterfly valve (20); a high-exhaust check valve (22) is arranged at the outlet of the high-pressure cylinder (2); the intermediate pressure cylinder (3) is connected with a heating network heater (14) through a heating steam extraction regulating valve (21).
4. The system for the normal operation of the boiler air heater in the emergency heating mode of the heating unit according to claim 3, wherein the outlet of the intermediate pressure cylinder (3) is connected with the deaerator (8) through a first valve set (23).
5. The system for normally operating the boiler air heater in the emergency heating mode of the heating unit according to claim 3, wherein the steam source inlet of the high-pressure heater group and the steam source inlet of the deaerator (8) are respectively provided with a second valve group (24) and a third valve group (25); the water outlet of the high-pressure heater group is connected with a first temperature and pressure reducing valve (27) through a fourth valve group (26); the drain outlet of the high-pressure heater group is connected with a deaerator (8).
6. The normal operation system of the boiler air heater in the emergency heating mode of the heating unit according to any one of claims 1 to 5, wherein the high-pressure heater group comprises a first high-pressure heater (10), a second high-pressure heater (11) and a third high-pressure heater (12) which are connected in sequence, and the drainage water of the third high-pressure heater (12) enters the deaerator (8) through the second high-pressure heater (11) and the first high-pressure heater (10) in sequence; the first high-pressure heater (10) is connected with the deaerator (8), and the third high-pressure heater (12) is respectively connected with the boiler (1) and the first temperature and pressure reducing valve (27).
7. The system for normal operation of a boiler air heater in an emergency heating mode of a heating unit according to claim 6, wherein a drain outlet of the heating network heater (14) is provided with a drain pump (15), and the drain pump (15) is connected with the second temperature and pressure reducing valve (28) through a fifth valve set (29).
8. The system for the normal operation of the boiler air heater in the emergency heating mode of the heating unit according to claim 7, wherein a heat supply network circulating water pump set (13) is further arranged at the inlet of the heat supply network heater (14).
9. The system for normally operating the boiler air heater in the emergency heating mode of the heating unit according to claim 1, wherein an outlet of the condenser (6) is connected with an inlet of a condensate pump (7), and an outlet of the condensate pump (7) is connected with an inlet of a deaerator (8); the outlet of the deaerator (8) is connected with the inlet of the water feed pump set (9), and the outlet of the water feed pump set (9) is connected with the inlet of the high-pressure heater set.
10. The system for normal operation of a boiler air heater in emergency heating mode of a heating unit according to claim 2, wherein the hot water air heater (16) is of shell-and-tube structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121319560.5U CN215061999U (en) | 2021-06-11 | 2021-06-11 | Normal operation system of boiler air heater in emergency heat supply mode of heat supply unit |
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| CN202121319560.5U CN215061999U (en) | 2021-06-11 | 2021-06-11 | Normal operation system of boiler air heater in emergency heat supply mode of heat supply unit |
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| CN215061999U true CN215061999U (en) | 2021-12-07 |
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| CN202121319560.5U Active CN215061999U (en) | 2021-06-11 | 2021-06-11 | Normal operation system of boiler air heater in emergency heat supply mode of heat supply unit |
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