System for carrying out boiler inlet air heating and humidifying through desulfurization slurry flash evaporation

Abstract

The utility model relates to a system for heating and humidifying inlet air of a boiler by flash evaporation of desulfurization slurry, which belongs to the technical field of air heaters and is characterized in that dead steam generated by a first flash evaporation unit provides a heat source for a first heat exchange unit, and a to-be-heated medium inlet of the first heat exchange unit is communicated with a liquid medium outlet of a first spraying heat exchanger; a to-be-heated medium outlet of the first heat exchange unit communicates with a spraying layer of the first spraying heat exchanger, and a first fresh air inlet and a first heating air outlet are formed in the first spraying heat exchanger. The slurry flash tank is used for spraying heat in the desulfurized slurry and heated circulating water to outdoor fresh air through the spraying device by means of medium circulation, and primary heating of the outdoor fresh air is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air heater technical field especially is related to a kind of desulfurization slurry flash evaporation carries out boiler air intake heating humidification system. BACKGROUND

[0002] Desulfurization slurry refers to the chemical slurry used by power plant to absorb sulfur dioxide and other acid gases in flue gas, in this desulfurization process, exothermic reaction occurs, such as sulfur dioxide and alkaline substance reaction to generate calcium sulfite, calcium sulfate and other products, which will release a large amount of heat. In addition, the heat generated by slurry circulating pump and other equipment during operation will also increase the temperature of slurry. Generally speaking, the temperature of desulfurization slurry can be maintained between 45℃-65℃, which belongs to medium-low temperature waste heat. Although this part of heat cannot be directly used for power generation and other high-grade energy utilization, it can meet the process requirements of some low temperature requirements, such as heating, domestic hot water, waste heat boiler air intake, etc.

[0003] At present, some power plants have begun to pay attention to the utilization of desulfurization slurry waste heat resources. For example, some power plants use heat exchanger to transfer the heat of desulfurization slurry to circulating water, and then use the circulating water with increased temperature for heating or domestic hot water supply in plant area; some power plants use the waste heat to preheat the air entering the boiler, improve the thermal efficiency of the boiler and reduce fuel consumption. However, there is still a certain amount of waste heat extraction potential in many power plants which have not fully developed and utilized this part of waste heat resources. If reasonable technical means and application system design are used, energy can be used efficiently, and the operation cost and energy consumption of power plant can be reduced.

[0004] Some power plants use electric air heater to preheat the air entering the boiler, which converts electric energy into heat energy through electric heating element (such as resistance wire, PTC ceramic heating element, etc.), when cold air flows through the electric air heater, heat exchange is carried out with the heating element, so that the temperature of air is increased to achieve the purpose of preheating. However, a large amount of electric energy is consumed during use, which increases the operation cost of the system. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model adopts the technical scheme of a kind of desulfurization slurry flash evaporation carries out boiler air intake heating humidification system, which comprises: a first flash evaporation unit, the steam exhaust of the first flash evaporation unit provides heat source for a first heat exchange unit, the inlet of the first heat exchange unit is communicated with the outlet of a first spray heat exchanger, the outlet of the first heat exchange unit is communicated with the spray layer of the first spray heat exchanger, and the first spray heat exchanger is provided with a first fresh air inlet and a first heated air outlet.

[0006] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0007] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0008] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0009] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0010] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0011] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0012] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0013] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0014] Further, the first heat exchange unit is connected with a second spray heat exchanger, a liquid medium outlet of the second spray heat exchanger is communicated with a to-be-heated medium inlet of the second heat exchange unit, and a spray layer of the second spray heat exchanger is communicated with a to-be-heated medium outlet of the second heat exchange unit.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. The heat in the desulfurization slurry is removed by a flash evaporator and the heated circulating water is sprayed onto the outdoor fresh air through an intermediate circulation system to achieve initial heating of the outdoor fresh air.

[0017] 2. Increasing the moisture content of the boiler's secondary intake air can regulate the temperature field within the furnace. This results in a more uniform temperature distribution, preventing problems such as slagging caused by localized overheating. It also helps control the flue gas temperature at the furnace outlet within a suitable range, meeting the operational requirements of downstream equipment.

[0018] 3. By utilizing the waste heat in the desulfurization slurry to replace the original electric-driven boiler air intake heater, the overall energy utilization rate of the power plant has been improved, and a certain degree of closed-loop energy utilization has been achieved. Attached Figure Description

[0019] Figure 1 This is a system diagram of this utility model;

[0020] Figure 2 This is a system diagram of Embodiment 1 of this utility model;

[0021] Figure 3 This is a system diagram of Embodiment 2 of this utility model;

[0022] Figure 4 This is a system diagram of Embodiment 3 of this utility model.

[0023] The attached figures indicate the following components: first flash evaporation unit 100, first heat exchange unit 200, first spray heat exchanger 300, first fresh air inlet 310, first heated air outlet 320, rotary air preheater 400, second spray heat exchanger 500, second fresh air inlet 510, second heated air outlet 520, connecting pipe 600, second flash evaporation unit 700, second heat exchange unit 800, and water supply pipe 900. Detailed Implementation

[0024] In the description of the utility model, need understanding is, the term "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "internal", "external" and so on indicate the orientation or positional relation is based on the orientation or positional relation shown in the drawing, only is for the convenience of describing the utility model and simplifying the description, and is not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as the restriction of the utility model. In addition, the term "first", "second" and so on are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and so on can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the utility model, it should be explained that, unless otherwise expressly provided and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, also can be detachable connection, or integral connection, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0026] The utility model will be further described below in conjunction with embodiments and drawings:

[0027] Embodiment 1: as Figure 1 And Figure 2As shown, a desulfurization slurry flash evaporation boiler air inlet heating and humidifying system comprises: a first flash evaporation unit 100, steam waste gas generated by the first flash evaporation unit 100 provides a heat source for a first heat exchange unit 200, a to-be-heated medium inlet of the first heat exchange unit 200 is in communication with a liquid medium outlet of a first spray heat exchanger 300, a to-be-heated medium outlet of the first heat exchange unit 200 is in communication with a spray layer of the first spray heat exchanger 300, and the first spray heat exchanger 300 is provided with a first fresh air inlet 310 and a first heated air outlet 320. The first heated air outlet 320 is connected with a first air medium inlet of a rotary air preheater 400, and heated air generated by a first air medium outlet of the rotary air preheater 400 is used to provide boiler primary air or boiler secondary air. The heated air generated by the first air medium outlet of the rotary air preheater 400 can also be used to provide boiler primary air and boiler secondary air at the same time. A heating water pipe 900 is arranged on the first heat exchange unit 200 or the first spray heat exchanger 300 or a pipeline between the to-be-heated medium inlet of the first heat exchange unit 200 and the liquid medium outlet of the first spray heat exchanger 300.

[0028] The first flash evaporation unit 100 can be subjected to vacuum treatment through a vacuum pump not shown in the figure, the first flash evaporation unit 100 is provided with a desulfurization slurry inlet pipe and an outlet pipe, and is driven to draw out by a flow pump. Desulfurization slurry at 45-65°C is subjected to negative pressure flash evaporation to generate steam waste gas, the steam waste gas enters the first heat exchange unit 200 to be condensed and heat-exchanged by intermediate water, thereby heating the intermediate water, condensed water after the steam waste gas is condensed is discharged through a condensed water channel, the first heat exchange unit 200 can be a partition heat exchanger or a heat exchange pipe or a heat exchange plate, the intermediate water after heat exchange enters the first spray heat exchanger 300 and is discharged through a spray plate or a spray head, the first spray heat exchanger 300 can be provided with external insulation to prevent heat loss, preferably, the first fresh air inlet 310 of the first spray heat exchanger 300 is higher than the position of the first heated air outlet 320, or the first fresh air inlet 310 of the first spray heat exchanger 300 can be lower than the position of the first heated air outlet 320, and the first fresh air inlet 310 is higher than the highest liquid level of the first spray heat exchanger 300, that is to say, the fresh air and the intermediate water can be subjected to co-current heat exchange or counter-current heat exchange, a water return pump I is arranged on a circulating water pipeline between the first heat exchange unit 200 and the first spray heat exchanger 300, an inlet of the heating water pipe 900 can be arranged after the water return pump I, a valve is arranged on the heating water pipe 900, or a pump valve control drive can be arranged for the heating water pipe 900, and the heated air can enter the rotary air preheater 400 alone or be divided into two streams to enter the rotary air preheater 400, thereby being able to heat the boiler primary air / boiler secondary air alone or at the same time.

[0029] Embodiment 2: asFigure 3 As shown in the figure, a desulfurization slurry flash evaporation boiler air inlet heating and humidifying system comprises a first flash evaporation unit 100, steam exhaust generated by the first flash evaporation unit 100 provides a heat source for a first heat exchange unit 200, a to-be-heated medium inlet of the first heat exchange unit 200 is in communication with a liquid medium outlet of a first spray heat exchanger 300, a to-be-heated medium outlet of the first heat exchange unit 200 is in communication with a spray layer of the first spray heat exchanger 300, and a first fresh air inlet 310 and a first heated air outlet 320 are arranged on the first spray heat exchanger 300. A second spray heat exchanger 500 is further included, a to-be-heated medium inlet of the first heat exchange unit 200 is in communication with a liquid medium outlet of the second spray heat exchanger 500, a to-be-heated medium outlet of the first heat exchange unit 200 is in communication with a spray layer of the second spray heat exchanger 500, and a second fresh air inlet 510 and a second heated air outlet 520 are arranged on the second spray heat exchanger 500. A communication pipeline 600 for conveying medium is arranged between the first spray heat exchanger 300 and the second spray heat exchanger 500. The first heated air outlet 320 is connected with a first air medium inlet of a rotary air preheater 400, and heated air generated by a first air medium outlet of the rotary air preheater 400 is used to provide boiler primary air or boiler secondary air. The heated air generated by the first air medium outlet of the rotary air preheater 400 can also be used to provide both the boiler primary air and the boiler secondary air. The first heated air outlet 320 and the second heated air outlet 520 are respectively connected with the first air medium inlet and the second air medium inlet of the rotary air preheater 400, the heated air generated by the first air medium outlet of the rotary air preheater 400 is used to provide the boiler primary air or the boiler secondary air, and the heated air generated by the second air medium outlet of the rotary air preheater 400 is used to provide the boiler secondary air or the boiler primary air. A water supplement pipeline 900 is arranged on the first heat exchange unit 200 or the first spray heat exchanger 300 or a pipeline between the to-be-heated medium inlet of the first heat exchange unit 200 and the liquid medium outlet of the first spray heat exchanger 300. A water supplement pipeline 900 can also be arranged on the second heat exchange unit 800 or the second spray heat exchanger 500 or a pipeline between the to-be-heated medium inlet of the second heat exchange unit 800 and the liquid medium outlet of the second spray heat exchanger 500.

[0030] On the basis of Embodiment 1, a second spray heat exchanger 500 is additionally provided, and cooperates with the first spray heat exchanger 300 through a connecting pipeline 600. The core improvement lies in the further optimization of the step-by-step utilization of heat energy and the flexibility of air volume distribution through the configuration of double spray heat exchangers. Specifically, the steam exhaust generated by the first flash evaporation unit 100 still provides a heat source for the first heat exchange unit 200, while the newly added second spray heat exchanger 500 shares the intermediate water circulation system with the first spray heat exchanger 300 through the connecting pipeline 600. After flowing out of the liquid medium outlet of the first spray heat exchanger 300, the intermediate water is divided into two streams: one enters the first heat exchange unit 200 for heating, and the other is transported to the spray layer of the second spray heat exchanger 500 through the connecting pipeline 600. By adjusting the valve or pump valve of the connecting pipeline 600, the flow distribution of the intermediate water between the two can be realized, thereby adapting to the heat load demand under different working conditions. The structure of the second spray heat exchanger 500 is similar to that of the first spray heat exchanger 300, and the design of its second fresh air inlet 510 and heated air outlet 520 also follows the counterflow or concurrent heat exchange principle. To improve system efficiency, the fresh air inlet position of the second spray heat exchanger 500 can be slightly higher than that of the first spray heat exchanger 300, so as to utilize natural convection to enhance the heat exchange effect. In addition, the spray layer of the second spray heat exchanger 500 can adopt a multi-stage nozzle design to ensure that the intermediate water and fresh air are in full contact, improving the uniformity of humidification and heating. On the hot air path, the first heated air outlet 320 and the second heated air outlet 520 are respectively connected with the two independent inlets of the rotary air preheater 400, forming a double-channel heating system. The heated air of the first channel is mainly used for the primary air of the boiler, while the heated air of the second channel can be used for the secondary air of the boiler or cross-supplied according to actual needs through valve switching. This design not only improves the utilization rate of hot air, but also effectively relieves the heat load pressure of a single channel, prolonging the service life of the equipment. The internal structure of the rotary air preheater 400 can adopt a honeycomb-type regenerator or a plate-type heat exchange structure, periodically absorbing and releasing heat through rotation, further reducing the exhaust gas temperature and improving the overall thermal efficiency. In addition to the water supply pipeline at the inlet pipeline of the first heat exchange unit 200 or the first spray heat exchanger 300, a water supply pipeline also needs to be added at the corresponding position of the second spray heat exchanger 500 to maintain the water balance of the intermediate water system. The inlet of the water supply pipeline can be set after the water return pump I or the water return pump II, and automatic water supply can be realized through a pressure sensor and an electric valve. In addition, to cope with the loss of intermediate water due to evaporation or leakage, a water quality monitoring device can be installed in the connecting pipeline 600 to adjust the water supply amount and water quality parameters such as pH value and conductivity in real time, avoiding scaling or corrosion problems. On the control strategy, a distributed control system (DCS) can be used to realize dynamic balance of the system by adjusting the vacuum degree of the flash evaporation unit, the frequency of the intermediate water circulation pump, and the opening degree of the air volume distribution valve.For example, when the boiler load increases, the vacuum pump's extraction rate can be increased to enhance the flash evaporation effect, while simultaneously increasing the flow rate of the connecting pipe 600 to ensure that the heat exchange capacity of the second spray heat exchanger 500 is improved in tandem. Furthermore, the system can integrate a waste heat recovery module to use the exhaust waste heat from the rotary air preheater 400 to preheat the desulfurization slurry, forming a closed-loop energy cycle and further reducing energy consumption.

[0031] Example 3: As Figure 4 As shown, a desulfurization slurry flash evaporation system for boiler inlet air heating and humidification includes: a first flash evaporation unit 100, wherein the exhaust steam generated by the first flash evaporation unit 100 provides a heat source for a first heat exchange unit 200, the inlet of the medium to be heated in the first heat exchange unit 200 is connected to the liquid medium outlet of a first spray heat exchanger 300, the outlet of the medium to be heated in the first heat exchange unit 200 is connected to the spray layer of the first spray heat exchanger 300, and the first spray heat exchanger 300 is provided with a first fresh air inlet 310 and a first heated air outlet 320. It also includes: a second flash evaporation unit 700, which is connected in series with the first flash evaporation unit 100. The exhaust steam generated by the second flash evaporation unit 700 provides a heat source for the second heat exchange unit 800. The inlet of the medium to be heated in the second heat exchange unit 800 is connected to the liquid medium outlet of the second spray heat exchanger 500, and the outlet of the medium to be heated in the second heat exchange unit 800 is connected to the spray layer of the second spray heat exchanger 500. The second spray heat exchanger 500 is provided with a second fresh air inlet 510 and a second heated air outlet 520. A connecting pipe 600 for transporting the medium is provided between the first spray heat exchanger 300 and the second spray heat exchanger 500. The first heated air outlet 320 is connected to the first air medium inlet of the rotary air preheater 400, and the heated air generated by the first air medium outlet of the rotary air preheater 400 is used to provide primary air or secondary air for the boiler. The heated air generated at the first air medium outlet of the rotary air preheater 400 can also be used to simultaneously supply primary air and secondary air to the boiler. The first heated air outlet 320 and the second heated air outlet 520 are respectively connected to the first air medium inlet and the second air medium inlet of the rotary air preheater 400. The heated air generated at the first air medium outlet of the rotary air preheater 400 is used to supply either primary air or secondary air to the boiler, and the heated air generated at the second air medium outlet of the rotary air preheater 400 is used to supply either secondary air or primary air to the boiler. A water supply pipe 900 is provided on the first heat exchange unit 200, the first spray heat exchanger 300, or the pipeline between the inlet of the medium to be heated in the first heat exchange unit 200 and the liquid medium outlet of the first spray heat exchanger 300. The first flash evaporation unit 100 and the second flash evaporation unit 700 can be connected by gravity drainage or by a drainage pump.

[0032] The water supplement pipeline 900 can also be arranged on the second heat exchange unit 800 or the second spray heat exchanger 500 or a pipeline between the medium inlet of the second heat exchange unit 800 to be heated and the liquid medium outlet of the second spray heat exchanger 500.

[0033] In the embodiment 3, the second flash unit 700 and the second heat exchange unit 800 are introduced on the basis of the embodiment 1 to form a two-stage flash system in series, which significantly improves the heat energy recovery efficiency of the desulfurization slurry. Specifically, the desulfurization slurry treated by the first flash unit 100 is not directly discharged, but enters the second flash unit 700 through a serial pipeline to be subjected to secondary flash at a lower pressure. The vacuum degree of the second flash unit 700 is maintained by an independent vacuum pump or a shared vacuum system with the first flash unit, and the operating pressure is usually 10%-20% lower than that of the first flash unit to ensure sufficient secondary flash. The steam exhaust generated by the secondary flash enters the second heat exchange unit 800 to provide a heat source for the second spray heat exchanger 500. The second heat exchange unit 800 has a structure similar to that of the first heat exchange unit 200 and can adopt a partition heat exchanger or a plate heat exchanger, but the heat exchange area can be larger to adapt to lower grade heat energy. The intermediate water is heated in the second heat exchange unit 800 and then subjected to heat and humidity exchange with the fresh air of the second spray heat exchanger 500 through a spray layer. The intermediate water is shared between the first spray heat exchanger 300 and the second spray heat exchanger 500 through the communication pipeline 600 to form a two-stage heating and humidifying system. In terms of temperature control, when the first flash unit 100 treats the desulfurization slurry at 45-65℃, the temperature can be reduced to 35-50℃, and then the desulfurization slurry is further cooled to 25-40℃ in the second flash unit 700. This stepwise cooling not only improves the flash efficiency but also reduces the final discharge temperature and reduces the dependence on the cooling system. The water supplement pipeline 900 needs to cover the two-stage system. In addition to the water supplement pipeline of the first-stage flash and heat exchange unit, independent water supplement pipelines also need to be arranged at corresponding positions of the second flash unit 700 and the second heat exchange unit 800. To optimize the use of water resources, a circulating water recovery system can be designed to collect the condensed water discharged from the spray heat exchanger, filter and desalt the condensed water, and then inject the condensed water into the water supplement pipeline.

[0034] The above embodiments of the utility model have been described in detail, but the content described can only be the preferred embodiments of the utility model and cannot be considered as limiting the scope of the utility model. Any equivalent changes and improvements made within the scope of the utility model application shall still belong to the patent coverage range of the utility model.

Claims

1. A system for heating and humidifying boiler inlet air using desulfurization slurry flash evaporation, characterized in that, include: The first flash evaporation unit (100) generates exhaust steam which provides a heat source for the first heat exchange unit (200). The inlet of the medium to be heated in the first heat exchange unit (200) is connected to the liquid medium outlet of the first spray heat exchanger (300). The outlet of the medium to be heated in the first heat exchange unit (200) is connected to the spray layer of the first spray heat exchanger (300). The first spray heat exchanger (300) is provided with a first fresh air inlet (310) and a first heated air outlet (320).

2. The desulfurization slurry flash evaporation boiler inlet air heating and humidification system according to claim 1, characterized in that, It also includes a second spray heat exchanger (500), the inlet of the medium to be heated of the first heat exchange unit (200) is connected to the liquid medium outlet of the second spray heat exchanger (500), the outlet of the medium to be heated of the first heat exchange unit (200) is connected to the spray layer of the second spray heat exchanger (500), and the second spray heat exchanger (500) is provided with a second fresh air inlet (510) and a second heated air outlet (520).

3. The desulfurization slurry flash evaporation boiler inlet air heating and humidification system according to claim 1, characterized in that, Also includes: The second flash unit (700) is connected in series with the first flash unit (100). The exhaust steam generated by the second flash unit (700) provides a heat source for the second heat exchange unit (800). The inlet of the medium to be heated in the second heat exchange unit (800) is connected to the liquid medium outlet of the second spray heat exchanger (500). The outlet of the medium to be heated in the second heat exchange unit (800) is connected to the spray layer of the second spray heat exchanger (500). The second spray heat exchanger (500) is provided with a second fresh air inlet (510) and a second heated air outlet (520).

4. A boiler inlet air heating and humidification system for desulfurization slurry flash evaporation according to claim 2 or 3, characterized in that, A connecting pipe (600) for conveying the medium is provided between the first spray heat exchanger (300) and the second spray heat exchanger (500).

5. A boiler inlet air heating and humidification system for desulfurization slurry flash evaporation according to any one of claims 1-3, characterized in that, The first heating air outlet (320) is connected to the first air medium inlet of the rotary air preheater (400), and the heating air generated by the first air medium outlet of the rotary air preheater (400) is used to provide primary air or secondary air for the boiler.

6. A boiler inlet air heating and humidification system for desulfurization slurry flash evaporation according to claim 5, characterized in that, The heated air generated at the first air medium outlet of the rotary air preheater (400) is used to supply the primary air and secondary air of the boiler.

7. A boiler inlet air heating and humidification system for desulfurization slurry flash evaporation according to claim 2 or 3, characterized in that, The first heating air outlet (320) and the second heating air outlet (520) are respectively connected to the first air medium inlet and the second air medium inlet of the rotary air preheater (400). The heating air generated by the first air medium outlet of the rotary air preheater (400) is used to provide primary air or secondary air for the boiler, and the heating air generated by the second air medium outlet of the rotary air preheater (400) is used to provide secondary air or primary air for the boiler.

8. A boiler inlet air heating and humidification system for desulfurization slurry flash evaporation according to claim 1, characterized in that, A water supply pipe (900) is provided on the first heat exchange unit (200) or the first spray heat exchanger (300) or on the pipeline between the inlet of the medium to be heated of the first heat exchange unit (200) and the outlet of the liquid medium of the first spray heat exchanger (300).

9. A boiler inlet air heating and humidification system for desulfurization slurry flash evaporation according to claim 4, characterized in that, A water supply pipe (900) is provided on the first heat exchange unit (200) or the first spray heat exchanger (300) or on the pipeline between the inlet of the medium to be heated of the first heat exchange unit (200) and the outlet of the liquid medium of the first spray heat exchanger (300).

10. A boiler inlet air heating and humidification system for desulfurization slurry flash evaporation according to claim 3, characterized in that, A water supply pipe (900) is provided on the second heat exchange unit (800) or the second spray heat exchanger (500) or on the pipeline between the inlet of the medium to be heated of the second heat exchange unit (800) and the outlet of the liquid medium of the second spray heat exchanger (500).

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