Heating energy-saving system and method deeply utilizing boiler room waste heat

Abstract

A heating energy-saving system and method deeply utilizing boiler room waste heat. In the heating energy-saving system, an air supply fan is arranged on an upper portion of a boiler room (10); operation layer relay fans (3) is mounted on an operation layer (11); an air preheater (12) is mounted inside a boiler room bottom layer (14); the air preheater (12) is communicated with an air outlet of a boiler-specific air supply fan (17) by means of an air supply duct I (16); an air inlet of the boiler-specific air supply fan (17) is communicated with an air inlet device by means of an air supply duct II; and an outdoor air inlet adjusting valve (4) and an indoor air inlet adjusting valve (5) are arranged on the air inlet device. According to the heating energy-saving method, when a temperature outside the boiler room (10) is lower than a set threshold, the air supply fan is started to supply air indoors, such that the temperature of the boiler room bottom layer (14) is higher than the lowest heating temperature, and the indoor air inlet adjusting valve (5) is kept to be opened, such that the air suction amount of the boiler-specific air supply fan (17) from indoors is maximized, and the steam consumption of the air preheater (12) is reduced, thereby achieving the purpose of saving energy.

Description

Heating energy-saving system and method for deep utilization of boiler room waste heat

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 8, 2023, with application number 202311674294.1 and invention name “Heating energy-saving system and method for deep utilization of boiler room waste heat”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of heating energy-saving technology, and relates to a heating energy-saving system and method for deeply utilizing the waste heat of a boiler room, thereby realizing full utilization of the waste heat of a boiler room having a heat source. Background Art

[0003] Power plant boiler rooms in severely cold regions are extremely tall, large-space buildings with a heat source. In winter, the negative pressure on the bottom floor of the boiler room is high, making heating difficult to guarantee. Thermal power plant boiler rooms are typical of extremely tall, large-space buildings with a large heat source. Winter cold air infiltration from the bottom floor is significant, especially in cold and extremely cold regions. High winter heating energy consumption, poor heating results, and frequent freezing of bottom-floor instruments are common in boiler rooms. The chimney effect can lead to the following on-site issues:

[0004] First, due to the significant negative pressure in the boiler room's lower floors, cold air from outside penetrated through doors, windows, and gaps in wall panels, potentially freezing equipment and piping near the infiltration point, affecting the safe and stable operation of the units. Second, the temperature above the boiler room was excessively high, with the furnace roof often reaching over 50°C in winter. This high temperature in the upper boiler room seriously impacted the normal operation of electrical and thermal components, and thus the safe operation of the units, while also complicating inspection and maintenance work by production personnel.

[0005] To address this situation, two patented technologies were developed: "Heating System and Method for Delivering Heat Downward from Upper Parts of Large-Space Buildings in Winter" (Patent No. ZL 200510044052) and "Heating System and Method for Controlling Negative Pressure on the Ground Floor of Ultra-High Large-Space Buildings" (Patent No. ZL 2014100143791). The "Heating System and Method for Delivering Heat Downward from Upper Parts of Large-Space Buildings in Winter" utilizes ventilation equipment and a heat source installed at the top of the building. The cool air introduced by the ventilation equipment mixes with the high-temperature air in the upper part of the building, increasing the indoor pressure to a higher level than the outdoor pressure, creating a slightly positive pressure environment. This prevents the entry of cold air and enhances the heating effect. The "Heating System and Method for Controlling Negative Pressure on the Ground Floor of Ultra-Tall and Large-Space Buildings" utilizes a fan installed above the boiler room to draw in cold outdoor air, creating a chimney effect that destroys the heat within the boiler room. Ventilation equipment is installed above the building's neutral surface and below the roof. The entry of cold air increases both the upper air quality and the indoor pressure, reducing the negative pressure on the ground floor of the ultra-tall and large-space boiler room. This achieves optimal heating performance and utilizes waste heat. The implementation of these two patented technologies has significantly improved heating conditions on the ground floor of power plant boiler rooms in severely cold regions, saving significant amounts of heating energy.

[0006] However, the above two patents still have some technical defects, and there are still some unsatisfactory problems that need to be solved on site. For example:

[0007] 1. The heat dissipation of the boiler room's equipment far exceeds the required heating load. During the coldest hours of the heating season, only a portion of the excess heat in the boiler room is utilized, leaving much unused. Even more excess heat remains unused during the transition season. During the transition season, outdoor air temperatures are higher. After roof and side wall fans draw in cold air to destroy the chimney effect, the overall temperature in the boiler room remains elevated due to the higher outdoor temperature compared to winter. The operating floor of the boiler room is a monolithic platform, and heat is transferred from the upper floors to the lower floors through gaps in the operating floor. This slow heat transfer causes heat to accumulate in the operating floor, resulting in a high operating floor temperature.

[0008] 2. During the transition season, only a small amount of outdoor air can be supplied to maintain the required temperature on the bottom floor of the boiler room. If more air is supplied to lower the temperature on the top of the furnace, the temperature on the operating floor will be too high, which is not worth it.

[0009] 3. Simultaneously with the aforementioned situation of a large amount of unused waste heat on the boiler room's top floor, the boiler's dedicated blower on the bottom floor constantly draws in outdoor air. This sub-zero outdoor air must be heated to above 20°C before it can be fed into the boiler's combustion system. Otherwise, the cold air will cause corrosion in the air duct system. All power plants' boiler air supply systems are equipped with air preheaters, which heat the incoming air to 20°C, consuming a significant amount of heat energy. Summary of the Invention

[0010] As mentioned above, existing patented technologies only utilize a small portion of the boiler room's waste heat in the coldest seasons, leaving even more unused waste heat in the transitional seasons (spring and autumn). This application aims to fully utilize the majority of the unused waste heat in the boiler room while saving conventional heating heat and ensuring the required heating temperature for the bottom floor of the boiler room. To achieve the above objectives, this application adopts the following technical solutions:

[0011] A heating and energy-saving system that makes full use of the waste heat from the boiler room is provided with several blowers on the upper part of the boiler room, and the relay blower on the operating floor is installed above the operating floor, and the relay blower on the operating floor is connected to the bottom floor of the boiler room below the operating floor. An air preheater is installed inside the bottom floor of the boiler room, and the air preheater is connected to the air outlet of the boiler professional blower through the air supply duct 1, and the air inlet of the boiler professional blower is connected to the air inlet device through the air supply duct 2. The air inlet device passes through the side wall of the boiler room, and an outdoor air inlet regulating valve is installed at the opening at one end of the air inlet device located outside the boiler room, and an indoor air inlet regulating valve is installed at the opening on the side wall of the air inlet device located indoors of the boiler room.

[0012] In an exemplary embodiment, the blower is installed on the roof of the boiler room or on the side wall of the boiler room.

[0013] In an exemplary embodiment, the blower arranged on the side wall of the boiler room is a side wall air supply device, which includes a side wall air supply duct with a square cross-section. The side wall air supply duct is connected to the interior of the boiler room, and the side wall blower is installed in the side wall air supply duct. The side wall air supply duct is located at the port at one end inside the boiler room, and side wall air outlets are opened on the upper side wall, left wall and right wall.

[0014] In an exemplary embodiment, several indoor temperature sensors and differential pressure sensors are provided inside the boiler room, and several outdoor temperature sensors are provided outside the boiler room.

[0015] In an exemplary embodiment, a fan electrical control cabinet is provided inside the boiler room, and the fan electrical control cabinet is electrically connected to the blower.

[0016] In an exemplary embodiment, an intelligent controller is provided next to the wind turbine electrical control cabinet, and the intelligent controller is electrically connected to the wind turbine electrical control cabinet.

[0017] In an exemplary embodiment, the boiler professional air blower includes a boiler air blower for supplying air to an air preheater and a boiler primary air blower.

[0018] The heating energy-saving method for deeply utilizing the waste heat of the boiler room, applying the aforementioned heating energy-saving system for deeply utilizing the waste heat of the boiler room, comprises the following steps:

[0019] When the outdoor temperature of the boiler room is lower than the set threshold, the blower is started to send outdoor air from the upper part of the boiler room into the boiler room. The outdoor air is mixed with the indoor air in the upper part of the boiler room and heated up. After the outdoor air absorbs the waste heat in the boiler room, the internal pressure of the boiler room increases. At the same time, it is sent to the bottom floor of the boiler room through the relay fan on the operating floor, so that the negative pressure value of the bottom floor of the boiler room is reduced, and the temperature of the bottom floor of the boiler room is higher than the set minimum heating temperature; at the same time, the indoor air inlet regulating damper is kept open, and the opening of the outdoor air inlet regulating damper is reduced to maximize the air suction volume of the boiler blower from the room. The mixed hot air is sucked into the boiler air supply system by the boiler blower, while reducing the amount of outdoor cold air sucked by the boiler blower, thereby reducing the steam consumption of the air preheater and achieving the purpose of energy saving.

[0020] Existing patented technologies only increase indoor pressure after supplying air, transferring the pressure downward and reducing the negative pressure at the bottom floor, without causing the air to flow downward. The present technology, in addition to reducing the negative pressure at the bottom floor, also delivers hot air from the upper part of the boiler room to the lower part, fully utilizing this hot air and saving energy consumption in the air preheater.

[0021] In an exemplary embodiment, the sealing condition of the boiler room is detected by an indoor-outdoor pressure difference sensor.

[0022] In an exemplary embodiment, indoor and outdoor temperatures are collected by temperature sensors, and the intelligent controller controls the blower, indoor air inlet regulating damper, and outdoor air inlet regulating damper according to changes in indoor and outdoor temperatures.

[0023] The beneficial effects of this application are:

[0024] Different from the existing patented technology, in addition to controlling the negative pressure on the bottom floor of the boiler room and ensuring the temperature on the bottom floor of the boiler room, this application can also use more air volume to send the remaining waste heat of the boiler room to the boiler blower system, making fuller use of the waste heat of the boiler room and reducing the steam consumption of the air preheater.

[0025] The blower at the top of the boiler room draws outdoor air into the room, where it absorbs heat from the boiler and other equipment, turning it into hot air. The relay blower on the operating floor then delivers the hot air to the bottom floor of the boiler room. The hot air is then drawn into the boiler's air supply system through the damper at the indoor air inlet of the boiler's dedicated blower. Because the air is drawn in hot, steam consumption in the air preheater is reduced.

[0026] The amount of air sucked from the room by the boiler's professional blower is controlled by the temperature of the bottom and upper parts of the boiler room. That is, the reduction of the steam consumption of the air preheater is achieved under the premise that the boiler room heating system is not running and the heating effect of the bottom floor of the boiler room is guaranteed, thus saving heating energy consumption.

[0027] The air supplied by the side wall air supply device is mixed with the indoor air in the annular space between the boiler body and the outer wall of the boiler room. Because the air is discharged in four directions, the air volume and wind speed in each direction will not be too large. Therefore, the air supply range is controlled within the annular space between the boiler body and the outer wall of the boiler room. Previous patents did not have this air supply method.

[0028] The operating floor platform blocks the air from flowing to the bottom floor. A relay fan is set on the operating floor platform to send the air that enters from the upper part of the boiler room and has absorbed heat to the bottom floor of the boiler room.

[0029] While previous patents used the temperature of the boiler room's bottom floor as the control point for air supply system activation, this application uses the outdoor temperature as the control point for air supply system activation. In this application, even if the bottom floor temperature of the boiler room meets the required temperature, the air supply system is still activated to deliver unused waste heat to the boiler's dedicated air supply fan.

[0030] In addition to maintaining a constant temperature on the boiler room floor, this application also requires ensuring that the remaining waste heat is delivered to the boiler's dedicated blower at an appropriate air volume. The outdoor temperature fluctuates in real time, requiring constant adjustment of the air volume. This task is accomplished by an intelligent controller. The intelligent controller also monitors the boiler room's sealing condition, alerting on-duty personnel to conduct inspections or repairs.

[0031] The indoor air duct of the professional boiler blower is equipped with an air suction port to draw air from the room. The previous boiler blower system did not draw air from the room.

[0032] The structure and principle of this application are simple and clear, the equipment investment is small, and it is easy to implement.

[0033] Figures in the specification

[0034] FIG1 is a schematic structural diagram of Example 1 of the present application;

[0035] Figure 2 is an enlarged view of point A in Figure 1;

[0036] FIG3 is a schematic structural diagram of the bottom floor of the boiler room in Example 1 of the present application;

[0037] FIG4 is a schematic structural diagram of Example 2 of the present application;

[0038] FIG5 is a schematic structural diagram of Example 3 of the present application;

[0039] FIG6 is a top view of a fourth embodiment of the present application in which side wall blowers are installed around the boiler room;

[0040] FIG7 is a second top view of the fourth embodiment of the present application in which side wall blowers are installed around the boiler room;

[0041] FIG8 is a third top view of the fourth embodiment of the present application, in which side wall blowers are installed around the boiler room.

[0042] Among them, 1. Side wall air supply device, 2. Roof supply fan, 3. Operation floor relay fan, 4. Outdoor air inlet regulating damper, 5. Indoor air inlet regulating damper, 6. Pressure difference sensor, 7. Indoor temperature sensor, 8. Outdoor temperature sensor, 9. Side wall air supply outlet, 10. Boiler room, 11. Operation floor, 12. Air preheater, 13. Boiler, 14. Boiler room bottom floor, 15. Side wall air supply duct, 16. Air supply duct 1, 17. Boiler professional air supply fan. DETAILED DESCRIPTION

[0043] The present application will be further described below with reference to the accompanying drawings and embodiments:

[0044] Example 1

[0045] As shown in Figures 1, 2, and 3, the boiler 13 is fixedly installed in the middle of the boiler room 10. The heating energy-saving system that makes full use of the waste heat of the boiler room includes an operating layer relay fan 3, which is fixedly installed above the operating layer 11 and is connected to the boiler room bottom layer 14 below the operating layer 11. An air preheater 12 is fixedly installed inside the boiler room bottom layer 14. The air preheater 12 is connected to the air outlet of the boiler professional blower 17 through the air supply duct 16. The air inlet of the boiler professional blower 17 is connected to the air inlet device through the air supply duct 2. The air inlet device passes through the side wall of the boiler room. The outdoor air inlet regulating damper 4 is fixedly installed at the opening of the air inlet device located outside the boiler room 10. The indoor air inlet regulating damper 5 is fixedly installed at the opening of the side wall of the air inlet device located inside the boiler room 10. An indoor temperature sensor 7 is fixedly installed inside the boiler room 10 below the air inlet device, a pressure difference sensor 6 is fixedly installed in the side wall of the boiler room below the air inlet device, and an outdoor temperature sensor 8 is fixedly installed outside the boiler room 10 below the air inlet device.

[0046] Several roof fans 2 are fixedly installed on the top of the boiler room 10, and the roof fans 2 are connected to the interior of the boiler room 10. Several side wall air supply devices 1 are fixedly installed on the upper part of the side wall of the boiler room. The side wall air supply device 1 includes a side wall air supply duct 15, which is connected to the interior of the boiler room 10. The side wall air supply duct 15 is fixedly installed in the side wall air supply duct 15. The side wall air supply duct 15 is located on one end of the side wall inside the boiler room 10 and has a side wall air supply port 9. There are four side wall air supply ports 9, which are respectively opened on the upper side wall, left side wall, right side wall and front end wall of the side wall air supply duct 15. Several pressure difference sensors 6 are fixedly installed on the upper part of the side wall of the boiler room near the side wall air supply duct 15, and several indoor temperature sensors 7 are fixedly installed on the upper part of the boiler room 10 near the side wall air supply duct 15.

[0047] Furthermore, a fan control cabinet is installed inside boiler room 10. The fan control cabinet is electrically connected to roof fan 2 and side wall fan, respectively, and the air volume of roof fan 2 and side wall fan is controlled by the fan control cabinet. Furthermore, an intelligent controller is installed next to the fan control cabinet, and the intelligent controller can also be integrated with the fan control cabinet.

[0048] When a power plant in a heating area has a large unit capacity, the amount of air required to draw waste heat from the boiler room 10 into the boiler-specific blower 17 increases, requiring a larger number of fans. In this case, in the first embodiment, fans can be placed on both the roof and the side walls. Side wall fans can be arranged on two or more floors. Side wall fans can be placed on both sides of the boiler room 10, or on all four sides.

[0049] The relay fans 3 in the operating layer also need to be arranged more frequently.

[0050] The heating energy-saving method for deeply utilizing the waste heat of the boiler room, applying the aforementioned heating energy-saving system for deeply utilizing the waste heat of the boiler room, comprises the following steps:

[0051] When the outdoor temperature is lower than the set threshold, it is considered that the fan system of the heating energy-saving system of this application can be started to supply air to the room. The boiler professional air blower 17 can draw air from the room to increase the air supply temperature and at the same time ensure the heating effect required by the bottom floor 14 of the boiler room.

[0052] The side wall air supply device 1 and roof air supply fan 2 above the boiler room 10 supply air to the indoor space, while the operating floor relay fan 3 supplies air to the boiler room's bottom floor 14. When the temperature of the bottom floor 14 is higher than the set minimum heating temperature, the indoor air inlet regulating damper 5 at the boiler room's dedicated air supply fan 17 remains open. When this indoor air inlet regulating damper 5 is open, the opening of the outdoor air inlet regulating damper 4 at the boiler room's dedicated air supply fan 17 is simultaneously reduced, reducing the amount of outdoor air entering and maximizing the amount of air sucked into the indoor space by the boiler room's dedicated air supply fan 17. This reduces steam consumption in the air preheater 12 and achieves energy conservation.

[0053] There are two reference values ​​for controlling the amount of air drawn from the room by the boiler blower 17: the temperature of the boiler room's bottom floor 14 and the temperature above the boiler room 10. When either temperature falls below its corresponding set value, the opening of the indoor air inlet regulating damper 5 at the boiler blower 17 is reduced, while the opening of the outdoor air inlet regulating damper 4 at the boiler blower 17 is increased to ensure heating on the boiler room's bottom floor 14. The premise for the boiler blower 17 to draw air from the room to raise the supply air temperature is to maintain the temperature of the boiler room's bottom floor 14. When the temperature of the boiler room's bottom floor 14 drops, the opening of the indoor air inlet regulating damper 5 needs to be reduced. Even if this results in increased steam usage in the air preheater 12, the amount of air drawn from the room by the boiler blower 17 needs to be reduced.

[0054] The indoor and outdoor pressure differential sensors monitor the sealing condition of the boiler room 10. A significantly decreased pressure differential at any location, either above or below the boiler room 10, indicates a sealing problem. This could include open or damaged doors and windows on the ground floor, or open or damaged access points, hanging holes, or ventilators on the roof. If the pressure differential changes significantly, the intelligent controller alerts personnel to conduct inspections or repairs.

[0055] Previous patents for controlling negative pressure on the ground floor of ultra-tall, large-space buildings show that the indoor heat source is located in the lower part of the room. However, the heat source in a power plant's boiler room is the boiler itself, which is roughly the same height as the boiler room. With the exception of the side wall blowers on the top floor, the side wall blowers below the furnace roof cannot blow air toward the opposite exterior wall or toward the center of the boiler room. The air from these blowers can only mix with the indoor air in the annular space between the boiler body and the boiler room's exterior wall. These blowers can have four air outlets: forward, left, right, and upward. Because air can be discharged in these four directions, the air volume and speed in each direction are limited. Consequently, the air supply range is confined to the annular space between the boiler body and the boiler room's exterior wall, preventing the hot air from being effectively blown toward the operating floor 11. Because the platform on the operating floor 11 hinders the flow of hot air to the bottom floor, an operating floor relay blower 3 is installed on the platform to deliver air that has entered and absorbed heat from the upper portion of the boiler room 10 to the bottom floor 14 of the boiler room.

[0056] The boiler professional blower 17 in the first embodiment includes all boiler blowers and boiler primary fans whose inlet air needs to enter the air preheater 12.

[0057] Example 2

[0058] As shown in Figure 4, when the generating capacity of a power plant in a heating area is relatively small, the amount of air required to draw waste heat from the boiler room 10 into the boiler-specific blowers 17 is relatively small, and fewer blowers are required. In this case, in Example 2, blowers can be placed only on the side walls, and side wall blowers can be arranged on two or more floors. Side wall blowers can be placed on both sides of the boiler room 10, or on all four sides.

[0059] The operating layer relay fan 3 can be determined according to the air volume of the upper air supply fan.

[0060] Example 3

[0061] As shown in Figure 5, when the generating capacity of a power plant in a heating area is relatively small, the amount of air required to draw waste heat from the boiler room 10 into the boiler-specific blowers 17 is relatively small, requiring fewer blowers. In this case, blowers can be placed on both the roof and the side walls, with the side wall blowers being placed on one floor. The side wall blowers can be placed on both sides of the boiler room 10, or on all four sides.

[0062] The operating layer relay fan 3 can be determined according to the air volume of the upper air supply fan.

[0063] Example 4

[0064] Embodiment 4 further defines the configuration of the side wall air supply devices 1 described in Embodiments 1, 2, and 3. As shown in FIG6 , a relatively small number of side wall air supply devices 1 are required, and they are fixedly installed on two opposing side walls of the boiler room 10. As shown in FIG7 , a relatively large number of side wall air supply devices 1 are required, and they are fixedly installed on the four surrounding side walls of the boiler room 10, with a relatively large number of side wall air supply devices 1 being arranged. As shown in FIG8 , a relatively small number of side wall air supply devices 1 are required, and they are fixedly installed on the four surrounding side walls of the boiler room 10, with a relatively small number of side wall air supply devices 1 being arranged.

[0065] Although the above describes the specific implementation methods of the present application in conjunction with the accompanying drawings, it does not limit the scope of protection of the present application. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present application, various modifications or variations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present application.

Claims

1. A heating energy-saving system that makes full use of the waste heat from the boiler room, characterized in that: A number of blowers are arranged on the upper part of the boiler room, the relay blower on the operating layer is installed above the operating layer, and the relay blower on the operating layer is connected with the bottom layer of the boiler room below the operating layer, an air preheater is installed inside the bottom layer of the boiler room, the air preheater is connected to the air outlet of the boiler professional blower through the air supply duct one, the air inlet of the boiler professional blower is connected to the air inlet device through the air supply duct two, the air inlet device passes through the side wall of the boiler room, an outdoor air inlet regulating valve is installed at the opening at one end of the air inlet device located outside the boiler room, and an indoor air inlet regulating valve is installed at the opening on the side wall of the air inlet device located inside the boiler room.

2. The heating energy-saving system for fully utilizing the waste heat of the boiler room according to claim 1 is characterized in that: The blower is installed on the roof of the boiler room or on the side wall of the boiler room.

3. The heating energy-saving system for fully utilizing the waste heat of the boiler room according to claim 2 is characterized in that: The blower arranged on the side wall of the boiler room is a side wall air supply device, which includes a side wall air supply duct with a square cross-section. The side wall air supply duct is connected to the interior of the boiler room. The side wall blower is installed in the side wall air supply duct. The side wall air supply duct is located at the port at one end inside the boiler room, and side wall air outlets are provided on the upper side wall, the left side wall and the right side wall.

4. The heating energy-saving system for fully utilizing the waste heat of the boiler room according to claim 1 is characterized in that: Several indoor temperature sensors and pressure difference sensors are arranged inside the boiler room, and several outdoor temperature sensors are arranged outside the boiler room.

5. The heating energy-saving system for fully utilizing the waste heat of the boiler room according to claim 1 is characterized in that: A fan electrical control cabinet is arranged inside the boiler room, and the fan electrical control cabinet is electrically connected to the air supply fan.

6. The heating energy-saving system for fully utilizing the waste heat of the boiler room according to claim 5 is characterized in that: An intelligent controller is arranged next to the electric control cabinet of the fan, and the intelligent controller is electrically connected to the electric control cabinet of the fan.

7. The heating energy-saving system for fully utilizing the waste heat of the boiler room according to claim 1 is characterized in that: The boiler professional blower includes a boiler blower for intake air into an air preheater and a boiler primary blower.

8. A heating energy-saving method for fully utilizing the waste heat from a boiler room, characterized in that: The application of the heating energy-saving system for deep utilization of boiler room waste heat as claimed in claim 1 comprises the following steps: When the outdoor temperature of the boiler room is lower than the set threshold, the air supply fan is started to send outdoor air from the upper part of the boiler room into the boiler room. The outdoor air is mixed with the indoor air in the upper part of the boiler room and heated up. After the outdoor air absorbs the waste heat in the boiler room, the internal pressure of the boiler room increases. At the same time, it is sent to the bottom floor of the boiler room through the operating layer relay fan, so that the negative pressure value of the bottom floor of the boiler room is reduced, and the temperature of the bottom floor of the boiler room is higher than the set minimum heating temperature; at the same time, the indoor air inlet regulating damper is kept open, and the opening of the outdoor air inlet regulating damper is reduced to maximize the air suction volume of the boiler professional air supply fan from the room. The mixed hot air is sucked into the boiler air supply system by the boiler professional air supply fan, and the suction volume of outdoor cold air by the boiler professional air supply fan is reduced, thereby reducing the steam consumption of the air preheater and achieving the purpose of energy saving.

9. The heating energy-saving method for intensively utilizing waste heat from a boiler room according to claim 8 is characterized in that: The sealing condition of the boiler room is detected by the indoor and outdoor pressure difference sensor.

10. The heating energy-saving method for fully utilizing the waste heat of a boiler room according to claim 8, characterized in that: The indoor and outdoor temperatures are collected by temperature sensors, and the intelligent controller controls the air supply fan, indoor air inlet regulating valve and outdoor air inlet regulating valve according to the changes in indoor and outdoor temperatures.

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