Novel device for recycling blow-off steam of waste heat boiler

Abstract

The utility model discloses a novel device for recycling waste heat boiler blow-off steam, which comprises a regular blow-off pipeline, a continuous blow-off pipeline, a blow-off flash tank, a deaerator, an emptying pipeline, a blow-off cooling pond and a tee joint, the continuous blow-off pipeline is communicated to a blow-off flash tank through a third stop valve, the high-temperature water output end of the blow-off flash tank is communicated to a blow-off cooling pond, the steam output end of the blow-off flash tank is communicated to a tee joint and is communicated to an emptying pipeline and a deaerator through the tee joint, and a second electric control valve is connected to a pipeline between the tee joint and the emptying pipeline. And an electric control valve I is connected to a pipeline between the tee joint and the deaerator. According to the utility model, steam for continuous blowdown and regular blowdown is managed in a branching manner, one path is used for recycling secondary steam for continuous blowdown, and boiler water and steam energy are recycled at the same time; and the other path is used for short-time emptying of the secondary steam for periodic pollution discharge, so that the adverse effect after the deaerator is connected is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat boilers, in particular to a device for newly recycling the blowdown steam of a waste heat boiler. Background Technique

[0002] During the boiler production process, blowdown is required to ensure the quality of the boiler circulating water, reduce corrosion and blockage of equipment. By means of regular blowdown and continuous blowdown, the cleanliness of the circulating water system is maintained, the service life of the equipment is extended, and the safe and stable operation of the boiler system is ensured.

[0003] The conventional boiler blowdown system directly discharges the high-temperature steam-water mixture generated by regular blowdown and continuous blowdown into the environment, resulting in waste of heat energy and water resources.

[0004] At present, an existing recovery technology is to separate steam and high-temperature water from boiler blowdown by using a flash tank. The high-pressure steam is led to the deaerator for heating and deaeration. However, the amount of regular blowdown is large, and introducing the recovered saturated steam into the deaerator will cause unstable operation of the deaerator and is not conducive to the stable operation of the system. Content of the Utility Model

[0005] To solve the above technical problems, the utility model designs a device for newly recycling the blowdown steam of a waste heat boiler.

[0006] The utility model adopts the following technical scheme:

[0007] A device for newly recycling the blowdown steam of a waste heat boiler includes a regular blowdown pipeline, a continuous blowdown pipeline, a blowdown flash tank, a deaerator, an evacuation pipeline, a blowdown cooling pool and a tee. The regular blowdown pipeline is connected to the blowdown flash tank through a stop valve II and an electric control valve I. The continuous blowdown pipeline is connected to the blowdown flash tank through a stop valve III. The high-temperature water output end of the blowdown flash tank is connected to the blowdown cooling pool. The steam output end of the blowdown flash tank is connected to the tee, and is respectively connected to the evacuation pipeline and the deaerator through the tee. An electric control valve II is connected to the pipeline between the tee and the evacuation pipeline, and an electric control valve I is connected to the pipeline between the tee and the deaerator.

[0008] Preferably, an electric control valve III is installed on the connecting pipeline between the blowdown flash tank and the tee.

[0009] Preferably, an electric control valve II is installed on the connecting pipeline between the blowdown flash tank and the blowdown cooling pool.

[0010] Preferably, the tee adopts an equal-diameter tee.

[0011] Preferably, a stop valve I is installed on the pipeline between the tee and the evacuation pipeline in front of the electric control valve II.

[0012] Preferably, a front stop valve and a rear stop valve are respectively installed before and after the first electric control valve on the pipeline between the three-way pipe and the deaerator.

[0013] Preferably, a check valve is installed behind the rear stop valve on the pipeline between the three-way pipe and the deaerator.

[0014] The beneficial effects of the utility model are as follows: The utility model designs a new device for recycling the blowdown steam of the waste heat boiler, and manages the continuous blowdown steam and the regular blowdown steam separately. One line is used to recover the secondary steam of continuous blowdown. Because the continuous blowdown lasts for a long time (blowdown throughout the day) and the flow rate is stable, it will not affect the normal operation of the deaerator equipment after entering the deaerator. At the same time, the boiler water and steam energy are recycled; the other line is used for the short-term venting of the secondary steam of regular blowdown. The period and instability of the regular blowdown secondary steam are not easy to control. By this way, the adverse effects such as overpressure and vibration of the deaerator caused by connecting the regular blowdown to the deaerator can be eliminated. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the utility model;

[0016] In the figure: 1. Regular blowdown pipeline, 2. Continuous blowdown pipeline, 3. Blowdown flash tank, 4. Deaerator, 5. Vent pipeline, 6. Blowdown cooling pond, 7. Three-way pipe, 8. Front stop valve, 9. First electric control valve, 10. Rear stop valve, 11. Check valve, 12. First stop valve, 13. Second electric control valve, 14. Second stop valve, 15. Third stop valve, 16. First electric control valve, 17. Second electric control valve, 18. Third electric control valve. Detailed Embodiments

[0017] The technical solutions of the present utility model will be further specifically described below through specific embodiments and in conjunction with the drawings:

[0018] Embodiment: As Figure 1 shown, a new device for recycling the blowdown steam of the waste heat boiler includes a regular blowdown pipeline 1, a continuous blowdown pipeline 2, a blowdown flash tank 3, a deaerator 4, a vent pipeline 5, a blowdown cooling pond 6 and a three-way pipe 7. The regular blowdown pipeline is connected to the blowdown flash tank through a second stop valve 14 and a first electric control valve 16. The continuous blowdown pipeline is connected to the blowdown flash tank through a third stop valve 15. The high-temperature water output end of the blowdown flash tank is connected to the blowdown cooling pond. The steam output end of the blowdown flash tank is connected to the three-way pipe and is respectively connected to the vent pipeline and the deaerator through the three-way pipe. An electric control valve 13 is connected to the pipeline between the three-way pipe and the vent pipeline, and an electric control valve 9 is connected to the pipeline between the three-way pipe and the deaerator.

[0019] An electric control valve three 18 is installed on the connecting pipeline between the blowdown expansion vessel and the tee. An electric control valve two 17 is installed on the connecting pipeline between the blowdown expansion vessel and the blowdown cooling pond.

[0020] The tee adopts an equal-diameter tee. A stop valve one 12 is installed on the pipeline between the tee and the evacuation pipeline in front of the electric control valve two. A front stop valve 8 and a rear stop valve 10 are respectively installed on the pipeline between the tee and the deaerator before and after the electric control valve one. A check valve 11 is installed on the pipeline between the tee and the deaerator behind the rear stop valve.

[0021] As Figure 1 shown, when the utility model is in use, the secondary steam generated in the blowdown expansion vessel is led out from the main pipe and divided into two by an equal-diameter tee. One path A sequentially passes through the front stop valve, the electric control valve one, the rear stop valve, and the check valve and is connected to the deaerator. The other path B is evacuated sequentially through the stop valve one and the electric control valve two.

[0022] The A line is used to recover the secondary steam of continuous blowdown. Because the continuous blowdown has a long duration (blowdown throughout the day) and a stable flow rate, it will not affect the normal operation of the deaerator equipment after entering the deaerator; the B line is used for the venting of the secondary steam of periodic blowdown. The time period and instability of the fixed-discharge secondary steam are not easy to control. After being connected to the deaerator, it will cause adverse effects such as overpressure and vibration of the deaerator.

[0023] Before the periodic blowdown of each shift, close the electric control valve one and open the electric control valve two to vent the fixed-discharge secondary steam. Usually, keep the electric control valve one open and the electric control valve two closed to recover the continuous blowdown secondary steam.

[0024] The above-described embodiments are only a preferred solution of the utility model, and do not impose any form of limitation on the utility model. There are other variants and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. A new device for recovering and utilizing waste heat boiler exhaust steam, characterized in that: It includes a regular sewage discharge pipeline, a continuous sewage discharge pipeline, a sewage expansion tank, a deaerator, an emptying pipeline, a sewage cooling tank and a tee. The regular sewage discharge pipeline is connected to the sewage expansion tank through stop valve 2 and electric control valve 1. The continuous sewage discharge pipeline is connected to the sewage expansion tank through stop valve 3. The high-temperature water output end of the sewage expansion tank is connected to the sewage cooling tank. The steam output end of the sewage expansion tank is connected to the tee, which are respectively connected to the emptying pipeline and the deaerator through the tee. The pipeline between the tee and the emptying pipeline is connected with electric regulating valve 2, and the pipeline between the tee and the deaerator is connected with electric regulating valve 1.

2. A novel device for recovering and utilizing waste heat boiler exhaust steam according to claim 1, characterized in that: An electric control valve three is installed on the connecting pipeline between the sewage expansion container and the three-way connection.

3. The novel device for recovering and utilizing waste heat boiler exhaust steam according to claim 1 is characterized in that: A second electric control valve is installed on the connecting pipeline between the sewage expansion tank and the sewage cooling tank.

4. The novel device for recovering and utilizing waste heat boiler exhaust steam according to claim 1 is characterized in that: The tee is an equal diameter tee.

5. The novel device for recovering and utilizing waste heat boiler exhaust steam according to claim 1 is characterized in that: A stop valve 1 is installed on the pipeline between the tee and the exhaust pipeline and in front of the electric regulating valve 2.

6. The novel device for recovering and utilizing waste heat boiler exhaust steam according to claim 1 is characterized in that: A front stop valve and a rear stop valve are respectively installed on the pipeline between the three-way valve and the deaerator, and are located before and after the electric regulating valve.

7. The novel device for recovering and utilizing waste heat boiler exhaust steam according to claim 6 is characterized in that: A check valve is installed on the pipeline between the tee and the deaerator after the rear stop valve.

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