Waste incineration boiler starting exhaust steam recycling system

Abstract

The utility model relates to the technical field of waste incineration boilers, in particular to a waste incineration boiler starting exhaust steam recycling system, which is characterized in that steam exhausted by a superheater steam collecting box is introduced into a steam-air preheater through an exhaust steam recycling system, heat exchange is carried out between the steam and primary cold air, and the waste incineration boiler starting exhaust steam recycling system is used for recycling waste incineration boiler starting exhaust steam. Primary cold air is heated into primary hot air, the temperature of the primary hot air can meet the requirement of waste incineration, steam heat recovery is achieved, steam is connected into the deaerator after forming condensate water, medium recovery is achieved, the energy-saving efficiency of the boiler is improved, and economic benefits are increased.

Description

Technical Field

[0001] This utility model relates to the field of waste incineration boiler technology, specifically a waste incineration boiler start-up exhaust steam recovery and utilization system. Background Technology

[0002] During the period from ignition and startup of the waste incineration boiler to its formal connection with the steam turbine, the superheated steam continuously generated by the boiler does not meet the power generation requirements of the steam turbine and needs to be discharged into the atmosphere through the vent valve. However, the entire boiler ignition process lasts for about 8 hours, during which the amount of steam discharged into the atmosphere from the superheater steam collector is very large, resulting in a significant waste of steam heat energy and medium.

[0003] Therefore, it is necessary to design a waste incineration boiler start-up exhaust steam recovery and utilization system, which can recover the steam in the boiler superheater steam collector box that does not meet the power generation requirements, thereby avoiding waste. At the same time, it can also recover condensate, forming a resource reuse and achieving the purpose of energy conservation and environmental protection. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a waste incineration boiler start-up exhaust steam recovery and utilization system. This system can recover steam from the boiler superheater steam collector box that does not meet the power generation requirements, thereby avoiding waste. At the same time, it can recover condensate, forming a resource reuse system and achieving the goal of energy conservation and environmental protection.

[0005] To achieve the above objectives, this utility model provides a waste incineration boiler start-up exhaust steam recovery and utilization system. The boiler superheater steam collection box is connected to an air exhaust valve through steam pipe six. The boiler superheater steam collection box is connected to an electric shut-off valve one through steam pipe seven. The electric shut-off valve one is connected to a desuperheating and pressure reducing device one through steam pipe eight. The desuperheating and pressure reducing device one is connected to an electric regulating valve one through steam pipe nine 11. The electric regulating valve one is connected to a shut-off valve one through steam pipe ten. The shut-off valve one is connected to steam pipe one through steam pipe eleven.

[0006] The boiler drum is connected to an electric shut-off valve 2 via steam pipe 5. The electric shut-off valve 2 is connected to a desuperheater and pressure reducer 2 via steam pipe 4. The desuperheater and pressure reducer 2 is connected to an electric regulating valve 2 via steam pipe 3. The electric regulating valve 2 is connected to a shut-off valve 2 via steam pipe 2. The shut-off valve 2 is connected to a steam-air preheater via steam pipe 1.

[0007] A silencer is connected to the air vent valve.

[0008] A condensate collection device is installed inside the steam-air preheater.

[0009] Compared with the prior art, the system is simple, can fully recover the steam discharged from the superheater collecting header during the ignition process of the waste incineration boiler, the steam discharged from the superheater collecting header is connected to the steam-air preheater through the arranged steam recovery system, heat exchange is carried out between the steam and the primary cold air, the primary cold air is heated into primary hot air, the temperature of the primary hot air can meet the requirement of waste incineration, steam heat recovery is realized, the steam forms condensed water and is connected to the deaerator, medium recovery is realized, the energy-saving efficiency of the boiler is improved, and economic benefits are increased. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a system schematic view of the utility model.

[0011] Boiler superheater collecting header 1, to empty exhaust valve 2, electric stop valve one 3, desuperheater one 4, electric regulating valve one 5, stop valve one 6, steam-air preheater 7, steam pipeline six 8, steam pipeline seven 9, steam pipeline eight 10, steam pipeline nine 11, steam pipeline ten 12, steam pipeline eleven 13, boiler drum 14, electric stop valve two 15, desuperheater two 16, electric regulating valve two 17, stop valve two 18, steam pipeline one 19, steam pipeline two 20, steam pipeline three 21, steam pipeline four 22, steam pipeline five 23, silencer 24. DETAILED DESCRIPTION

[0012] The utility model will be further described in conjunction with the drawings.

[0013] See Figure 1 The utility model provides a kind of waste incineration boiler starting exhaust recovery system, boiler superheater collecting header 1 is connected with empty exhaust valve 2 by steam pipeline six 8, boiler superheater collecting header 1 is connected with electric stop valve one 3 by steam pipeline seven 9, electric stop valve one 3 is connected with desuperheater one 4 by steam pipeline eight 10, desuperheater one 4 is connected with electric regulating valve one 5 by steam pipeline nine 11, electric regulating valve one 5 is connected with stop valve one 6 by steam pipeline ten 12, stop valve one 6 is connected to steam pipeline one 19 by steam pipeline eleven 13;

[0014] Boiler drum 14 is connected with electric stop valve two 15 by steam pipeline five 23, electric stop valve two 15 is connected with desuperheater two 16 by steam pipeline four 22, desuperheater two 16 is connected with electric regulating valve two 17 by steam pipeline three 21, electric regulating valve two 17 is connected with stop valve two 18 by steam pipeline two 20, stop valve two 18 is connected with steam-air preheater 7 by steam pipeline one 19.

[0015] Empty exhaust valve 2 is connected with silencer 24.

[0016] The steam-air preheater 7 is provided with a condensed water collecting device.

[0017] The working principle of the utility model is as follows:

[0018] The steam in the boiler superheater collecting header 1 cannot enter the steam turbine to generate electricity when the superheat degree does not meet the design requirements, at which time the superheated steam can be discharged to the atmosphere through the air exhaust valve 2. The utility model recycles this part of steam.

[0019] When the boiler is ignited and started, the air exhaust valve 2 is closed or the opening of the air exhaust valve 2 is reduced, the steam discharged from the superheater collecting header 1 is controlled to below 4.0MPa after the pressure reducing valve 4, the electric stop valve 3, the pressure reducing valve 4, the electric regulating valve 5 and the hand stop valve 6 are opened, the electric stop valve 15, the pressure reducing valve 16, the electric regulating valve 17 and the hand stop valve 18 are closed, the flow of the steam entering the steam-air preheater 7 is controlled through the electric regulating valve 5, the air inlet of the steam-air preheater 7 is cold air, and the cold air is heated to hot air after preheating through the steam-air preheater 7, thereby playing a combustion-supporting role of the boiler.

[0020] When the boiler steam normally enters the steam turbine to run, the electric stop valve 15, the pressure reducing valve 16, the electric regulating valve 17 and the hand stop valve 18 are opened, the electric stop valve 3, the pressure reducing valve 4, the electric regulating valve 5 and the hand stop valve 6 are closed, and at this time the steam of the steam-air preheater 7 comes from the boiler drum 14.

[0021] The boiler exhaust steam and the primary air are heat exchanged through the steam-air preheater 7, the primary air cold air is heated to primary air hot air, the condensed water generated after the steam and the primary air cold air are heat exchanged is connected to the deaerator, the medium is recycled, the thermal efficiency of the boiler is improved, and the economic benefit is increased.

[0022] The above is only the preferred embodiment of the utility model, and is only used to help understand the method and the core idea of the utility model, the protection scope of the utility model is not limited to the above-mentioned embodiments, and any technical scheme belonging to the idea of the utility model belongs to the protection scope of the utility model. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the utility model can also be regarded as the protection scope of the utility model.

[0023] In the description of the utility model, need explain, the term "upper", "lower", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position 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 can not be understood as the limitation to the utility model.

[0024] The utility model from overall solved the insufficient place of the waste of heat energy caused by the external air exhaust of the superheated steam in the prior art, through recycling this part of superheated steam, realized the maximization of resource utilization and the effect of energy saving and environmental protection.

Claims

1. A waste incineration boiler startup exhaust steam recycling system characterized by comprising: The boiler superheater header (1) is connected with a steam vent valve (2) through steam pipeline six (8), the boiler superheater header (1) is connected with an electric stop valve one (3) through steam pipeline seven (9), the electric stop valve one (3) is connected with a desuperheater one (4) through steam pipeline eight (10), the desuperheater one (4) is connected with an electric regulating valve one (5) through steam pipeline nine (11), the electric regulating valve one (5) is connected with a stop valve one (6) through steam pipeline ten (12), the stop valve one (6) is connected to steam pipeline one (19) through steam pipeline eleven (13); The boiler drum (14) is connected with an electric stop valve two (15) through steam pipeline five (23), the electric stop valve two (15) is connected with a desuperheater two (16) through steam pipeline four (22), the desuperheater two (16) is connected with an electric regulating valve two (17) through steam pipeline three (21), the electric regulating valve two (17) is connected with a stop valve two (18) through steam pipeline two (20), the stop valve two (18) is connected with a steam-air preheater (7) through the steam pipeline one (19).

2. The waste incineration boiler start-up exhaust steam recovery system according to claim 1, characterized in that, The steam vent valve (2) is connected with a silencer (24).

3. The waste incineration boiler start-up exhaust steam recovery system according to claim 1, characterized by, The steam-air preheater (7) is provided with a condensate collecting device.

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