Closed boiler steam-water sampling device

Abstract

The utility model relates to the technical field of boiler sampling, in particular to a closed boiler steam-water sampling device which comprises a sampling water tank, a cooling water tank and a heat exchanger, the sampling water tank is arranged on one side of the cooling water tank, and the sampling water tank is communicated with the cooling water tank; a plurality of heat exchangers are arranged at the top of the cooling water tank at intervals and correspond to steam drums of the boiler one to one, and steam water enters the heat exchangers from the steam drums, is cooled by the cooling water tank and then is sampled in the sampling water tank; the top of the cooling water tank is provided with an extraction opening, and the bottom is provided with a drain outlet; a water inlet is formed in one side of the cooling water tank; a water return port is formed in the bottom of the sampling water tank; the side wall of the sampling water tank is provided with a sampling opening corresponding to an outlet of each heat exchanger. Steam and water of the steam pocket can be uniformly cooled in the cooling water tank, the occupied space is small, maintenance is convenient, scaling of the heat exchanger is avoided, and the heat exchange efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of boiler sampling technology, specifically a closed boiler steam and water sampling device. Background Technology

[0002] Boilers are widely used in various industries such as power, chemical, and textile, and are commonly used heat energy conversion equipment in industrial production. They transfer the heat energy generated by fuel combustion to water to produce steam or hot water. When it is necessary to understand the water quality and internal structure of a high-temperature boiler, it is necessary to sample and test the steam and water produced inside the boiler. Currently, the sampler designed for a 30MW gas-fired generator unit has six single-unit samplers per boiler. The sampling equipment mainly uses ordinary carbon steel pipes welded for both the inner and outer shells, with a top flange seal and a bottom steel plate blockage. The internal heat exchange tubes are cooled using ordinary domestic water, with a surrounding cooling space of 45mm. The above-mentioned single-unit sampler has the following shortcomings:

[0003] The original design was a single heat exchanger, which occupied a large area. The water sampling was external, which could easily lead to steam leakage, resulting in high indoor humidity and equipment corrosion. Secondly, the internal cooling space of the heat exchange tubes was small, making it impossible to clean properly after scaling. Scale buildup on the heat exchange tubes could also block the cooling water circulation, shortening the service life of the heat exchange tubes and increasing maintenance. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a closed boiler steam and water sampling device, which has the advantages of simple structure, small space occupation, and no scaling during heat exchange.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A closed boiler steam-water sampling device includes a sampling water tank, a cooling water tank, and heat exchangers. The sampling water tank is located on one side of the cooling water tank and is connected to the cooling water tank. Several heat exchangers are spaced apart on the top of the cooling water tank, and each heat exchanger corresponds to a steam drum of the boiler. After the steam and water enter the heat exchangers from the steam drum, they are cooled by the cooling water tank and then sampled in the sampling water tank. The top of the cooling water tank has an exhaust port, and the bottom has a drain port. A water inlet is located on one side of the cooling water tank, and a water return port is located at the bottom of the sampling water tank. Sampling ports are provided on the side wall of the sampling water tank corresponding to the outlets of each heat exchanger.

[0007] Compared with the prior art, the beneficial effects of this utility model are:

[0008] The cooling water in this invention can be recycled, meeting the requirements of energy conservation and environmental protection. Furthermore, the steam and water from the boiler drum are cooled in a unified cooling water tank, which takes up little space and is easy to maintain. It also eliminates the problems of scale buildup and steam leakage in the heat exchanger.

[0009] Furthermore, the preferred embodiment adopted by this utility model is:

[0010] Each heat exchanger in the cooling water tank has a number of flange holes corresponding to each other. A blind plate is installed at the top of the flange hole. The inlet end of the heat exchanger passes through the blind plate and connects to the steam drum, while the outlet end passes through the blind plate and extends into the sampling water tank.

[0011] The portion of the heat exchanger located in the cooling water tank is spiral-shaped.

[0012] Each sampling port is equipped with a sampling gate.

[0013] The top of the cooling water tank is higher than the top of the sampling water tank.

[0014] The top of the cooling water tank is connected to the sampling water tank via an overflow pipe.

[0015] A shut-off valve is installed at the outlet of the heat exchanger. The flow rate of the heat exchanger is controlled by the shut-off valve.

[0016] The sampling tank is equipped with a support platform for placing the sampling cup at the outlet end of each heat exchanger.

[0017] The cooling water in the cooling water tank is condensate to prevent scale buildup on the heat exchanger. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0020] Figure 3 yes Figure 1 A schematic diagram of the BB direction;

[0021] Figure 4 yes Figure 1 Top view;

[0022] Figure 5 This is a schematic diagram of the sampling port structure;

[0023] Figure 6 This is a schematic diagram of the heat exchanger.

[0024] Figure 7 This is a schematic diagram of the connection structure between the sampling gate and the sampling port.

[0025] Explanation of reference numerals in the attached drawings: 1. Sampling water tank; 2. Cooling water tank; 3. Heat exchanger; 4. Inlet; 5. Outlet; 6. Drain; 7. Overflow pipe; 8. Flange hole; 9. Blind flange; 10. Support pipe; 11. Air extraction port; 12. Shut-off valve; 13. Sampling door; 14. Sampling port; 15. Support platform; 16. Inner nut; 17. Outer nut; 18. Handle. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments. The purpose of this description is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0027] like Figures 1 to 7 As shown, a closed boiler steam and water sampling device is composed of a sampling water tank 1, a cooling water tank 2, and a heat exchanger 3. The sampling water tank 1 and the cooling water tank 2 are respectively cut and welded from steel plates. The sampling water tank 1 is placed on one side of the cooling water tank 2 and the two are welded into a whole. A support pipe 10 is provided inside the sampling water tank 1, and the two ends of the support pipe 10 are respectively welded and fixed to the side wall of the sampling water tank 1.

[0028] The top of the sampling water tank 1 is equipped with an air extraction port 11, and the sampling water tank 1 is connected to the induced draft fan through the air extraction port 11; the bottom of the cooling water tank 2 is equipped with a drain port 6; the side of the cooling water tank 2 is equipped with a water inlet 4, and the bottom of the sampling water tank 1 is equipped with a water return port 5.

[0029] The top of the cooling water tank 2 is higher than the top of the sampling water tank 1, and overflow pipes 7 are respectively installed at both ends of the top of the cooling water tank 2. The cooling water tank 2 is connected to the sampling water tank 1 through the overflow pipes 7. When water is filled into the cooling water tank 2, the air in the cooling water tank 2 enters the sampling water tank 1 through the overflow pipes 7 and is drawn away by the exhaust fan through the air extraction port 11. When the cooling water tank 2 is full of cooling water, the cooling water enters the sampling water tank 1 along the overflow pipes 7.

[0030] The top of the cooling water tank 2 is provided with a corresponding number of flange holes 8 according to the vertical direction of the boiler drum. A heat exchanger 3 is inserted into each flange hole 8, and a blind plate 9 is bolted to the port of each flange hole 8. The heat exchanger 3 and the blind plate 9 are assembled together.

[0031] In this embodiment, the heat exchanger 3 is a spiral structure made of stainless steel tubes. After the heat exchanger 3 is placed in the flange hole 8, the inlet end of the heat exchanger 3 passes through the blind plate 9 and is connected to the corresponding steam drum. The connection between the heat exchanger 3 and the blind plate 9 is welded and fixed. The outlet end of the heat exchanger 3 extends through the blind plate 9 into the sampling water tank 1. The connection between the heat exchanger 3 and the sampling water tank 1 is also welded and fixed.

[0032] In this embodiment, each heat exchanger 3 is also provided with a needle valve 12 at its outlet end to control the flow rate of condensate in the heat exchanger 3.

[0033] Sampling ports 14 are provided on the side wall of the sampling water tank 1 corresponding to the outlet end of each heat exchanger 3. A sampling door 13 is provided on the outer side of each sampling port 14. The upper center position of the sampling door 13 is hinged to the side wall of the sampling water tank 1 by a bolt assembly. The screw in the bolt assembly is the door hinge, and the sampling door 13 can rotate around the door hinge. A through hole is opened at the lower center position of the sampling door 13, and an outer nut 17 is welded to the outer side of the sampling door 13 corresponding to the through hole position. A handle 18 is connected to the inner thread of the outer nut 17. A hole is also opened on the side wall of the sampling water tank 1 corresponding to the through hole position, and an inner nut 16 is welded to the inner wall of the sampling water tank 1 corresponding to the through hole position. The opening and closing state of the sampling door 13 can be adjusted by the threaded connection between the handle 18 and the inner nut 16.

[0034] In this embodiment, a support platform 15 for placing the sampling cup is welded inside the sampling water tank 1 corresponding to the outlet end of each heat exchanger 3.

[0035] In this embodiment, the cooling water in the cooling water tank 2 is condensate.

[0036] When this invention is used for steam and water sampling in the steam drum, the sampling door 13 is opened, and the sampling cup is placed on the support platform 15 below the outlet end of the heat exchanger 3 of the corresponding steam drum. Then, the steam and water isolation door (primary and secondary door) of the boiler is opened, the shut-off valve 12 is opened, and the boiler water flow rate is adjusted using the shut-off valve 12. The boiler water is introduced into the heat exchanger 3 through the steam drum and cooled and condensed in the cooling water tank 2. The boiler water temperature drops from 530℃ to about 40℃. Then, the condensate is discharged into the sampling cup through the outlet end. After the sampling cup has collected an appropriate amount of condensate, the shut-off valve 12 is closed to stop sampling. Then, the sampling cup is removed, the sampling door 13 is closed, and the steam and water isolation door is closed at the same time.

[0037] In this application, the steam and water used for sampling from the boiler drum are cooled uniformly in a cooling water tank. The condensate from the cooled steam and water is then introduced into the sampling water tank for sampling. This eliminates the need for a separate heat exchanger, reduces space requirements, and facilitates maintenance. Furthermore, the cooling water in the cooling water tank is condensate (soft water), which avoids scaling problems on the heat exchanger, ensuring heat exchange efficiency while extending the service life of the heat exchanger. Additionally, the outlet end of the heat exchanger is sealed inside the sampling water tank to prevent steam leakage.

[0038] The above description is merely a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A closed boiler water and steam sampling device comprising a sampling tank, characterised in that: The cooling water tank and the heat exchanger are further included, the sampling water tank is arranged on one side of the cooling water tank, and the sampling water tank is communicated with the cooling water tank; a plurality of heat exchangers are arranged at the top of the cooling water tank in intervals, the heat exchangers are arranged in one-to-one correspondence with the steam drums of the boiler, steam water enters the heat exchangers from the steam drums, is cooled in the cooling water tank, and is sampled in the sampling water tank; the cooling water tank is provided with a gas extraction port at the top and a blowdown port at the bottom; the cooling water tank is provided with a water inlet on one side, and the sampling water tank is provided with a backwater outlet at the bottom; the side wall of the sampling water tank is provided with a sampling port corresponding to the outlet of each heat exchanger.

2. A closed-bolt water-steam sampling device according to claim 1, characterized in that: The cooling water tank is provided with a plurality of flange holes corresponding to each heat exchanger in one-to-one correspondence, a blind plate is arranged at the top end of the flange hole, the inlet end of the heat exchanger penetrates through the blind plate and is connected with the steam drum, and the outlet end of the heat exchanger penetrates through the blind plate and extends into the sampling water tank.

3. A closed-bolt water sampling device according to claim 2, wherein: The part of the heat exchanger arranged in the cooling water tank is in a spiral shape.

4. The closed-bolt water sampling device of claim 1, wherein: Each sampling port is provided with a sampling door.

5. The closed-bolt water sampling device of claim 1, wherein: The top of the cooling water tank is higher than the top of the sampling water tank.

6. A closed-bolt water sampling device according to claim 5, wherein: The top of the cooling water tank is connected with the sampling water tank through an overflow pipe.

7. The closed boiler steam water sampling device according to claim 3, characterized in that: The outlet end of the heat exchanger is provided with a stop valve.

8. The closed-bolt water sampling device of claim 1, wherein: The inside of the sampling water tank is provided with a support platform for placing a sampling cup corresponding to the outlet end of each heat exchanger.

9. The closed-bolt water sampling device of claim 1, wherein: The cooling water in the cooling water tank is condensate water.

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