Exhaust gas recovery device of waste heat boiler

Abstract

The exhaust gas recovery device of the waste heat boiler comprises the waste heat boiler, the waste heat boiler is connected with a blow-off pipe, the blow-off pipe is connected with a flash tank, the blow-off pipe is connected with a drain pipe, the drain pipe is connected with a cooling well, the cooling well is connected with a water conveying pipe, and the water conveying pipe is connected with a circulating water pool. The circulating water tank is connected with a water return pipe, a water spray pipe is arranged in the flash tank and located on the upper portion of the flash tank, one end of the water spray pipe penetrates out of the side wall of the flash tank, the water return pipe is connected with the outer end of the water spray pipe, and a plurality of spray heads are arranged on the water spray pipe in the length direction of the water spray pipe. After water discharged by the flash tank is cooled, the water is conveyed back into the flash tank through the water return pipe to condense steam generated in the flash tank, so that the steam is condensed into water to be conveniently recycled, meanwhile, the corrosion of the steam to equipment is reduced, and the service life is prolonged; the structure is simple and the use mode is convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to boiler equipment technical field relates to a waste heat boiler exhaust gas recovery device. BACKGROUND

[0002] The waste heat boiler periodic blowdown flash tank is one of the key equipment of the waste heat power generation system, and the boiler blowdown water, the accident blowdown water and the continuous blowdown water are all discharged to the periodic blowdown flash tank, and the secondary steam and the hot water are separated after the pressure reduction and expansion of the periodic blowdown flash tank. The separated steam is directly discharged to the atmosphere through the steam discharge pipe at the top of the periodic blowdown flash tank, but the exhaust gas of the periodic blowdown flash tank is discharged for a long time, and the following problems exist: a large amount of steam carrying heat is directly discharged into the air, causing energy waste, and the discharged steam is easy to cause corrosion to the flue gas air cooler, affecting the service life thereof; in addition, when the weather is cold, the discharged steam is rapidly cooled and frozen, affecting the safety of personnel inspection walking. SUMMARY

[0003] The utility model discloses a waste heat boiler exhaust gas recovery device.

[0004] Therefore, the utility model discloses the following technical scheme:

[0005] A waste heat boiler exhaust gas recovery device, including waste heat boiler, waste heat boiler is connected with blowdown pipe, the blowdown pipe is connected with the expansion tank, is connected with the drain pipe, the drain pipe is connected with the cooling well, the cooling well is connected with the water delivery pipe, the water delivery pipe is connected with the circulating water pool, the circulating water pool is connected with the backwater pipe, the expansion tank is equipped with the water jet pipe in, the water jet pipe is located in the upper portion of expansion tank, and one end of the water jet pipe is out of the side wall of expansion tank, the backwater pipe is connected with the outer end of water jet pipe, and a plurality of spray heads are arranged on the water jet pipe along the length direction of the water jet pipe.

[0006] Further, a plurality of cooling plates are arranged in the expansion tank and are arranged in parallel with each other, the cooling plates are arranged below the spray heads, and gaps are formed between the cooling plates.

[0007] Further, a V-shaped structure bending part is formed in the middle of the cooling plate.

[0008] Further, the cooling plate is arranged vertically.

[0009] Further, the blowdown valve is arranged on the blowdown pipe.

[0010] Further, the water delivery pump is arranged on the water delivery pipe.

[0011] Further, the backwater pump is arranged on the backwater pipe.

[0012] Further, the water jet pipe is arranged horizontally.

[0013] Further, the drain pipe is provided with a drain valve.

[0014] The utility model discloses beneficial effect lies in: the water of expansion vessel is discharged cooling, through the backwater pipe and is transported back to the expansion vessel, the steam generated in the expansion vessel is condensed, makes steam condenses into water, in order to recycle, reduces the corrosion of steam to equipment simultaneously, prolongs the life. BRIEF DESCRIPTION OF DRAWINGS

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

[0016] Figure 2 It is Figure 1 It is the partial close -up view of A department in the middle;

[0017] In the drawing, 1 - waste heat boiler, 2 - blowdown pipe, 3 - expansion vessel, 4 - blowdown valve, 5 - drain pipe, 6 - cooling well, 7 - drain valve, 8 - water delivery pipe, 9 - circulating water pool, 10 - water delivery pump, 11 - backwater pipe, 12 - water jet pipe, 13 - spray head, 14 - cooling plate, 15 - gap, 16 - bending part, 17 - backwater pump. DETAILED DESCRIPTION

[0018] The utility model will be described in detail below in conjunction with the drawings:

[0019] For example, Figure 1 And 2As shown, a kind of waste heat boiler exhaust gas recovery device, including waste heat boiler 1, waste heat boiler 1 is connected with blowdown pipe 2, blowdown pipe 2 is connected with expansion vessel 3, blowdown pipe is equipped with blowdown valve 4, the sewage in waste heat boiler 1 can be discharged to expansion vessel 3 in blowdown pipe 2, secondary steam and hot water are separated in expansion vessel 3, expansion vessel 3 is connected with drain pipe 5, drain pipe 5 is connected with cooling well 6, drain pipe 5 is equipped with drain valve 7, the hot water in expansion vessel 3 can be discharged to cooling well 6 in drain pipe 5 and cooling, cooling well 6 is connected with water delivery pipe 8, water delivery pipe 8 is connected with circulating water pool 9, water delivery pipe 8 is equipped with water delivery pump 10, circulating water pool 9 is connected with backwater pipe 11, expansion vessel 3 is equipped with the water jet pipe 12 that is horizontally set, water jet pipe 12 is located in the upper portion of expansion vessel 3, and the water jet pipe 12 is connected with the outer end of backwater pipe 11, and backwater pipe 11 is equipped with backwater pump 17, can be input to the water in circulating water pool 9 in water jet pipe 12 by backwater pipe 11, water jet pipe 12 is equipped with a plurality of spray heads 13 along the length direction of water jet pipe 12, steam in expansion vessel 3 is cooled and condensed by the water sprayed by spray head 13, so that steam is condensed into water, to prevent steam loss, for recycling, to further improve the condensation effect, expansion vessel 3 is equipped with a plurality of cooling plates 14 that are arranged in parallel, cooling plate 14 is made of stainless steel, cooling plate 14 is vertically arranged, cooling plate 14 is below spray head 13, and clearance 15 is formed between cooling plate 14, steam can flow upward in clearance 15 and be condensed by contacting water, and the condensed water is collected on cooling plate 14 and then flows to the bottom of expansion vessel 3, and V-shaped structure bending part 16 is formed in the middle of cooling plate 14, bending part 16 can increase the flow distance of steam, prolong the contact time with water, and improve the condensation effect.

[0020] The use mode of the utility model is as follows:

[0021] In the use process, the waste water discharged by waste heat boiler 1 is discharged into expansion vessel 3 through blowdown pipe 2, and then secondary steam and hot water are separated in expansion vessel 3, and the hot water is discharged into cooling well 6 through drain pipe 5, and then the water in circulating water pool 9 is input into water jet pipe 12 through backwater pipe 11 under the action of backwater pump 13, and finally sprayed through spray head 13, and then the secondary steam separated in expansion vessel 3 is condensed, and the steam is condensed into water, specifically, the steam in expansion vessel 3 contacts the water sprayed by spray head 13 in clearance 15 between cooling plate 14 in the rising process, the condensed water is collected on cooling plate 14 and then flows to the bottom of expansion vessel 3, in addition, the steam can increase the flow distance by passing through bending part 16, prolong the contact time with water, and further improve the condensation effect, and improve the condensate recovery rate.

[0022] The device can effectively reduce the discharge of the expander 3, recycle the steam, reduce the corrosion of the steam on the equipment and prolong the service life.

Claims

1. A waste heat boiler exhaust gas recovery device comprising a waste heat boiler (1), characterized in that, The waste heat boiler (1) is connected with a blowdown pipe (2), the blowdown pipe (2) is connected with an expansion vessel (3), the expansion vessel (3) is connected with a drain pipe (5), the drain pipe (5) is connected with a cooling well (6), the cooling well (6) is connected with a water delivery pipe (8), the water delivery pipe (8) is connected with a circulating water pool (9), the circulating water pool (9) is connected with a backwater pipe (11), a water spraying pipe (12) is arranged in the expansion vessel (3), the water spraying pipe (12) is located at the upper portion of the expansion vessel (3), one end of the water spraying pipe (12) is arranged to pass through the side wall of the expansion vessel (3), the backwater pipe (11) is connected with the outer end of the water spraying pipe (12), and a plurality of spraying heads (13) are arranged on the water spraying pipe (12) along the length direction of the water spraying pipe (12).

2. A waste heat boiler exhaust gas recovery device according to claim 1, characterized in that, A plurality of cooling plates (14) are arranged in the expansion vessel (3) and are arranged in parallel with each other, the cooling plates (14) are located below the spraying heads (13), and gaps (15) are formed between the cooling plates (14).

3. A waste heat boiler exhaust gas recovery device according to claim 2, characterized in that, A V-shaped structure bending portion (16) is formed in the middle portion of the cooling plate (14).

4. A waste heat boiler exhaust gas recovery device according to claim 2, characterized in that, The cooling plate (14) is arranged vertically.

5. The waste heat boiler exhaust gas recovery device of claim 1, wherein, A blowdown valve (4) is arranged on the blowdown pipe (2).

6. A waste heat boiler exhaust gas recovery device according to claim 1, characterized in that, A water delivery pump (10) is arranged on the water delivery pipe (8).

7. A waste heat boiler exhaust gas recovery device according to claim 1, characterized in that, A backwater pump (17) is arranged on the backwater pipe (11).

8. A waste heat boiler exhaust gas recovery device according to claim 1, characterized in that, The water spraying pipe (12) is arranged horizontally.

9. A waste heat boiler exhaust gas recovery device according to claim 1, characterized in that, A drain valve (7) is arranged on the drain pipe (5).

Images