Heating energy-saving system and method for fully utilizing waste heat from boiler room

Abstract

The present invention belongs to the technical field of heating energy saving, and relates to a heating energy saving system and method for deeply utilizing the waste heat of a boiler room. In the heating energy saving system, a blower is arranged on the upper part of the boiler room, a relay blower on the operating layer is installed above 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 1, and the air inlet of the boiler professional blower is connected to the air inlet device through the air supply duct 2, and the air inlet device is provided with an outdoor air inlet regulating air valve and an indoor air inlet regulating air valve. The heating energy saving method, when the outdoor temperature of the boiler room is lower than the set threshold, starts the blower to supply air to the room, so that the temperature of the bottom layer of the boiler room is higher than the minimum heating temperature, keeps the indoor air inlet regulating air valve open, maximizes the air suction volume of the boiler professional blower from the room, reduces the steam consumption of the air preheater, and achieves the purpose of energy saving. The structure and principle of the present invention are simple and clear, with low equipment investment and easy implementation.

Description

Technical Field

[0001] The present invention belongs to the technical field of heating energy saving, 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

[0002] The boiler room of a power plant in a severely cold region is a super-high and large-space building with a heat source. In winter, the negative pressure on the bottom floor of the boiler room is large, and the heating effect is difficult to guarantee. The boiler room of a thermal power plant is a typical super-high and large-space building with a large heat source. In winter, cold wind penetrates the bottom floor. Especially in cold and severely cold regions, it is a common phenomenon that the boiler room consumes a lot of energy and has poor heating effects in winter, and the bottom floor instruments are often frozen. The boiler room is affected by the chimney effect, and the following problems mainly occur on site:

[0003] First, due to the huge negative pressure on the bottom floor of the boiler room, the outdoor cold air penetrates into the boiler room through the gaps in the doors, windows and wall panels, making the equipment and pipes near the cold air penetration point easy to freeze, affecting the safe and stable operation of the unit. Second, at the same time, the temperature in the upper part of the boiler room is too high. The temperature on the top of the furnace often reaches above 50°C in winter. The high temperature problem in the upper part of the boiler room has a serious impact on the normal operation of electrical and thermal components, and thus affects the safe operation of the unit. It also makes it difficult for production personnel to inspect and repair.

[0004] In response to the above situation, two invention patent technologies were developed, namely, "Heating system and method for sending heat downward from the upper part of a large space building in winter" (patent number ZL 200510044052) and "Heating system and method for controlling negative pressure on the bottom floor of a super-high large space building" (patent number ZL 2014100143791). "Heating system and method for sending heat downward from the upper part of a large space building in winter" installs ventilation equipment and heat sources on the top of the building. The cold air sent into the room by the ventilation equipment mixes with the air in the high-temperature area in the upper part of the room, making the indoor pressure greater than the outdoor pressure, forming a slightly positive pressure environment, preventing the entry of cold air and enhancing the heating effect. "Heating system and method for controlling negative pressure on the bottom floor of ultra-high and large-space buildings" sets a fan on the upper floor of the boiler room to inhale outdoor cold air to destroy the chimney effect of heat in the boiler room. Ventilation equipment is installed above the middle and surface of the building and below the top. After the cold air enters, the upper air quality and indoor pressure are increased, making the negative pressure value of the bottom floor of the ultra-high and large-space boiler room smaller, achieving a good heating effect, and also utilizing indoor waste heat. After the implementation of these two patented technologies, the heating conditions of the bottom floor of the boiler room of power plants in cold regions have been greatly improved, saving a lot of heating heat energy.

[0005] However, the above two patents still have some technical defects, and there are still some unsatisfactory problems on site that need to be solved. For example:

[0006] 1. The heat dissipation of the equipment in the boiler room is much greater than the heating heat load required by the boiler room. During the coldest period of the heating season, only a part of the waste heat in the boiler room is utilized, and a lot of waste heat is not utilized. There is more waste heat in the boiler room that is not utilized in the transition season. During the transition season, the outdoor air temperature is higher. After the outdoor cold air is inhaled through the roof fan and the side wall fan to destroy the chimney effect of the boiler room, the overall temperature in the boiler room will still be higher at this time because the outdoor cold air temperature is higher than the outdoor temperature in winter; the operating layer in the boiler room is an integral platform, and the heat from the upper layer of the boiler room is transferred to the bottom layer through the gaps in the operating layer. The heat transfer is slow, and the heat will accumulate in the operating layer, resulting in a higher operating layer temperature.

[0007] 2. In the transition season, only a small amount of outdoor air supply is needed to ensure the temperature requirement of the bottom layer of the boiler room. If more air is supplied in order to reduce the temperature of the furnace top, the temperature of the operating layer will be too high, which is not worth it.

[0008] 3. At the same time as the large amount of waste heat on the top floor of the boiler room is idle and cannot be used, the boiler professional air blower on the bottom floor of the boiler room has been sucking outdoor air, and the outdoor air below zero must be heated to above 20℃ before it can be sent to the boiler combustion system. Otherwise, the cold air will cause corrosion of the air duct system. All power plants have air preheaters in their boiler air supply systems, and the air inlet of the air preheater needs to be heated to 20℃, which consumes a lot of heat energy. Summary of the invention

[0009] As mentioned above, the existing patented technology only utilizes a small part of the residual heat in the boiler room in the coldest season, and there is more residual heat that is not utilized in the transition season (spring and autumn). The present invention is to fully utilize most of the residual heat in the boiler room that has not been utilized on the basis of saving conventional heating heat and ensuring the heating temperature requirements of the bottom floor of the boiler room. In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A heating energy-saving system that makes full use of the waste heat from the boiler room is composed of several fans arranged on the upper part of the boiler room, the relay fan on the operating layer is installed above the operating layer, and the relay fan on the operating layer is connected to 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-specific fan through air supply duct one, the air inlet of the boiler-specific fan is connected to the air inlet device through air supply duct two, the air inlet device passes through the side wall of the boiler room, the outdoor air inlet regulating valve is installed at the opening at one end of the air inlet device located outdoors of the boiler room, and the 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.

[0011] Preferably, the blower is arranged on the roof of the boiler room, or on the side wall of the boiler room.

[0012] Preferably, 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 a port at one end inside the boiler room, and side wall air outlets are provided on the upper side wall, the left wall and the right wall.

[0013] Preferably, a plurality of indoor temperature sensors and pressure difference sensors are arranged inside the boiler room, and a plurality of outdoor temperature sensors are arranged outside the boiler room.

[0014] Preferably, 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.

[0015] Preferably, 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.

[0016] Preferably, the boiler professional blower includes a boiler blower for intake air into an air preheater and a boiler primary blower.

[0017] The heating energy-saving method for deeply utilizing the waste heat of the boiler room, using the aforementioned heating energy-saving system for deeply utilizing the waste heat of the boiler room, comprises the following steps:

[0018] 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.

[0019] The existing related patented technology only increases the indoor pressure after sending air to the room, and the pressure is transmitted downward, reducing the negative pressure at the bottom, but does not make the air flow downward. In addition to reducing the negative pressure at the bottom, this patented technology also sends the hot air from the upper part of the boiler room to the lower part, and makes full use of the hot air to save the energy consumption of the air preheater.

[0020] Preferably, the sealing condition of the boiler room is detected by an indoor and outdoor pressure difference sensor.

[0021] Preferably, the indoor and outdoor temperatures are collected by temperature sensors, and the intelligent controller controls the air supply fan, the indoor air inlet regulating air valve and the outdoor air inlet regulating air valve according to the changes in the indoor and outdoor temperatures.

[0022] The beneficial effects of the present invention are:

[0023] Different from the existing patented technology, the present invention can not only control the negative pressure of the bottom floor of the boiler room and ensure the temperature of the bottom floor of the boiler room, but also use more air volume to send the remaining waste heat of the boiler room to the boiler blower system, so as to make fuller use of the waste heat of the boiler room and reduce the steam consumption of the air preheater.

[0024] The outdoor air is sent into the room through the blower at the top of the boiler room, where it absorbs the heat dissipated by the boiler and heat pipes and other equipment, and becomes hot air. The hot air is then sent to the bottom of the boiler room by the relay blower at the operating floor, and is sucked into the boiler air supply system through the indoor air inlet regulating damper at the boiler professional blower. Because hot air is inhaled, the steam consumption of the air preheater is reduced.

[0025] 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, reducing 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.

[0026] 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.

[0027] The operating layer platform blocks the air from flowing to the bottom layer. A relay fan is set on the operating layer platform to send the air that enters from the upper part of the boiler room and has absorbed heat to the bottom layer of the boiler room.

[0028] The start-up of the air supply system in the previous patent is based on the temperature of the bottom floor of the boiler room as the control point, while the start-up of the air supply system in the present invention is based on the outdoor temperature as the control point. In the present invention, the air supply system is still started when the temperature of the bottom floor of the boiler room meets the requirements, so as to send the unused waste heat into the boiler professional air supply fan.

[0029] In addition to ensuring the bottom temperature of the boiler room, the present invention also ensures that the remaining waste heat of the boiler room is sent to the boiler professional blower with appropriate air volume. The outdoor temperature changes in real time, and the air volume also needs to be adjusted at any time. This work is completed by the intelligent controller. The intelligent controller can also detect the sealing condition of the boiler room and remind the on-duty personnel to check or repair it.

[0030] The indoor air duct of the professional boiler blower is provided with an air suction port to suck air from the indoor room. The previous boiler blower system did not suck air from the indoor room.

[0031] The structure and principle of the invention are simple and clear, the equipment investment is small, and it is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0033] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0034] Figure 3 This is a schematic structural diagram of the bottom floor of a boiler room according to the first embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0037] Figure 6 A top view of the fourth embodiment of the present invention in which side wall blowers are arranged around the boiler room Figure 1 ;

[0038] Figure 7 A top view of the fourth embodiment of the present invention in which side wall blowers are arranged around the boiler room Figure 2 ;

[0039] Figure 8 A top view of the fourth embodiment of the present invention in which side wall blowers are arranged around the boiler room Figure 3 .

[0040] Among them, 1. Side wall air supply device, 2. Roof supply fan, 3. Operating floor relay fan, 4. Outdoor air inlet regulating air valve, 5. Indoor air inlet regulating air valve, 6. Pressure difference sensor, 7. Indoor temperature sensor, 8. Outdoor temperature sensor, 9. Side wall air supply outlet, 10. Boiler room, 11. Operating floor, 12. Air preheater, 13. Boiler, 14. Boiler room bottom floor, 15. Side wall air supply duct, 16. Air supply duct one, 17. Boiler professional air supply fan. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment 1

[0042] like Figure 1 , Figure 2 , Figure 3As shown, the boiler 13 is fixedly installed in the middle position inside 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 the operating layer relay fan 3 is connected to the bottom layer 14 of the boiler room below the operating layer 11, and an air preheater 12 is fixedly installed inside the bottom layer 14 of the boiler room. The air preheater 12 is connected to the air outlet of the boiler professional air blower 17 through the air supply duct 16, and the air inlet of the boiler professional air blower 17 is connected to the air inlet device through the air supply duct 2. The air inlet device penetrates the side wall of the boiler room, and the outdoor air inlet regulating air valve 4 is fixedly installed at the opening of the air inlet device located at one end outside the boiler room 10, and the indoor air inlet regulating air valve 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 differential pressure 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.

[0043] A number of roof fans 2 are fixedly installed on the top of the boiler room 10, and the roof fans 2 are connected to the inside of the boiler room 10. A number of side wall air supply devices 1 are fixedly installed on the upper part of the side wall of the boiler room, and the side wall air supply device 1 includes a side wall air supply duct 15, and the side wall air supply duct 15 is connected to the inside of the boiler room 10. The side wall fan 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 a side wall air supply port 9 is opened. The number of side wall air supply ports 9 is four, which are respectively opened on the upper side wall, the left side wall, the right side wall and the front end wall of the side wall air supply duct 15. A number of differential pressure 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 a number of indoor temperature sensors 7 are fixedly installed on the upper part of the boiler room 10 near the side wall air supply duct 15.

[0044] Furthermore, a fan electric control cabinet is provided inside the boiler room 10, and the fan electric control cabinet is electrically connected to the roof air supply fan 2 and the side wall air supply fan, respectively, and the air volume of the roof air supply fan 2 and the side wall air supply fan is controlled by the fan electric control cabinet. Furthermore, an intelligent controller is provided next to the fan electric control cabinet, and the intelligent controller can also be integrated with the fan electric control cabinet.

[0045] When the unit capacity of the power plant in the heating area is relatively large, the amount of air sucked into the boiler professional blower 17 by the waste heat of the boiler room 10 is large, and the number of blowers required is large. In this case, in the first embodiment, blowers can be arranged on the roof and the side wall at the same time, and the blowers on the side wall can be arranged on 2 layers or more. The blowers on the side wall can be arranged on both sides of the boiler room 10, and can also be arranged on all four sides of the boiler room 10.

[0046] The operating layer relay fans 3 also need to be arranged more frequently.

[0047] The heating energy-saving method for deeply utilizing the waste heat of the boiler room, using the aforementioned heating energy-saving system for deeply utilizing the waste heat of the boiler room, comprises the following steps:

[0048] When the outdoor temperature is lower than the set threshold, it is considered that the fan system of the heating energy-saving system of the present invention can be started to supply air to the room. The boiler professional blower 17 can draw air from the room to increase the supply air temperature and at the same time ensure the heating effect required by the bottom floor 14 of the boiler room.

[0049] The side wall air supply device 1 and the roof air supply fan 2 on the upper part of the boiler room 10 supply air to the room, and the operating floor relay fan 3 supplies air to the bottom floor 14 of the boiler room. When the temperature of the bottom floor 14 of the boiler room is higher than the set minimum heating temperature, the indoor air inlet regulating air valve 5 at the boiler professional air supply fan 17 is kept open. When the indoor air inlet regulating air valve 5 is opened, the opening of the outdoor air inlet regulating air valve 4 at the boiler professional air supply fan 17 is simultaneously reduced to reduce the outdoor air intake, so as to maximize the air intake of the boiler professional air supply fan 17 from the room, so as to reduce the steam consumption of the air preheater 12 and achieve the purpose of energy saving.

[0050] There are two reference values ​​for controlling the air volume sucked from the room by the boiler blower 17, one is the temperature of the bottom floor 14 of the boiler room, and the other is the temperature of the upper part of the boiler room 10. When any temperature is lower than its corresponding set value, the opening of the indoor air inlet regulating valve 5 at the boiler blower 17 should be reduced, and the opening of the outdoor air inlet regulating valve 4 at the boiler blower 17 should be increased to ensure the heating of the bottom floor 14 of the boiler room. The premise for the boiler blower 17 to suck air from the room to increase the air supply temperature is to ensure the temperature of the bottom floor 14 of the boiler room. When the temperature of the bottom floor 14 of the boiler room decreases, the opening of the indoor air inlet regulating valve 5 needs to be reduced, even if it will increase the steam usage of the air preheater 12, it is also necessary to reduce the indoor air suction volume of the boiler blower 17.

[0051] The indoor and outdoor pressure difference sensors can detect the sealing condition of the boiler room 10. If the pressure difference value at any place in the upper or lower part of the boiler room 10 is significantly reduced, it means that there is a problem with the sealing of that part, such as the doors and windows on the bottom floor are open or damaged, or the entrance, hanging hole, and ventilator on the top of the furnace are open or damaged. When the pressure difference value changes greatly, the intelligent controller can remind the on-duty personnel to check or repair.

[0052] In the previous patents for controlling negative pressure on the bottom floor of ultra-high and large-space buildings, the indoor heat source is shown in the lower part of the room, while the heat source of the boiler room of the power plant is the boiler body, and the height of the boiler body is almost the same as that of the boiler room. Except for the side wall blower on the top floor, the side wall blowers below the furnace top cannot blow the wind to the opposite outer wall or to the middle of the boiler room. The air supplied by these fans can only be mixed with the indoor air in the annular space between the boiler body and the outer wall of the boiler room. The air supply ports of these fans can have four directions, namely the front, left and right, and top. Because there are four directions of air discharge, 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, and the hot air cannot be effectively blown to the operating layer 11. In view of the fact that the platform of the operating layer 11 hinders the hot air from running to the bottom floor, an operating layer relay blower 3 is set on the platform of the operating layer 11 to send the air that enters the upper part of the boiler room 10 and has absorbed heat to the bottom floor 14 of the boiler room.

[0053] The boiler professional blower 17 in the first embodiment includes all boiler blowers and boiler primary blowers whose inlet air needs to enter the air preheater 12. Embodiment 2

[0054] like Figure 4 As shown, when the unit capacity of the power plant in the heating area is small, the amount of air that absorbs the waste heat of the boiler room 10 into the boiler professional blower 17 is smaller, and the number of blowers required is less. In this case, the second embodiment can only arrange blowers on the side walls, and the blowers on the side walls can be arranged on 2 layers or more. The blowers on the side walls can be arranged on both sides of the boiler room 10, or on all four sides of the boiler room 10.

[0055] The operating layer relay fan 3 can be determined according to the air volume of the upper air supply fan. Embodiment 3

[0056] like Figure 5 As shown, when the unit capacity of the power plant in the heating area is relatively small, the amount of air that absorbs the waste heat of the boiler room 10 into the boiler professional blower 17 is relatively small, and the number of blowers required is a little less. In this case, blowers can be arranged on the roof and side walls at the same time, and the blowers on the side walls can be arranged on one floor. The blowers on the side walls can be arranged on both sides of the boiler room 10, or on all four sides of the boiler room 10.

[0057] The operating layer relay fan 3 can be determined according to the air volume of the upper air supply fan. Embodiment 4

[0058] Embodiment 4 is a further limitation on the arrangement structure of the side wall air supply device 1 in Embodiments 1, 2 and 3. Figure 6 As shown, the number of side wall air supply devices 1 required is relatively small, and the side wall air supply devices 1 are fixedly installed on two opposite side walls of the boiler room 10. Figure 7 As shown, the number of side wall air supply devices 1 required is relatively large, and the side wall air supply devices 1 are fixedly installed on the four side walls around the boiler room 10, and the number of side wall air supply devices 1 arranged is relatively large. Figure 8 As shown, the required number of side wall air supply devices 1 is small, and the side wall air supply devices 1 are fixedly installed on the four side walls around the boiler room 10, and the number of them arranged is small.

[0059] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A heating energy-saving system that makes full use of the waste heat from the boiler room, characterized in that: A plurality of blowers are arranged at the upper part of the boiler room, and the blowers are used 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 and heated at the upper part of the boiler room. After the outdoor air absorbs the waste heat in the boiler room, the internal pressure of the boiler room is increased, and at the same time, it is sent to the bottom layer of the boiler room through the relay blower of the operating layer. The relay blower of the operating layer is installed above the operating layer, and the relay blower of 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 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 air valve is installed at the opening of one end of the air inlet device located outside the boiler room, and an indoor air inlet regulating air valve is installed at the opening of the side wall of the air inlet device located indoors in the boiler room; 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 a port at one end inside the boiler room, and side wall air supply outlets are provided on the upper side wall, the left wall and the right wall, so that the air supply range is controlled within the annular space between the boiler body and the outer wall of 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 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.

4. 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.

5. The heating energy-saving system for fully utilizing the waste heat of the boiler room according to claim 4 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.

6. 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.

7. 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.

8. The heating energy-saving method for intensively utilizing the waste heat of a boiler room according to claim 7 is characterized in that: The sealing condition of the boiler room is detected by the indoor and outdoor pressure difference sensor.

9. The heating energy-saving method for intensively utilizing the waste heat of a boiler room according to claim 7 is 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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