Sewage discharge system for flushing pulverized coal bunker of boiler

Abstract

The utility model discloses a sewage discharge system during flushing of a boiler pulverized coal bunker, the bottom of the boiler pulverized coal bunker is provided with two rows of pulverized coal discharge ports, the number of each row of pulverized coal discharge ports is four, the sewage discharge system comprises two ship-shaped flushing tanks arranged below the two rows of pulverized coal discharge ports at the bottom of the boiler pulverized coal bunker, the lower part of the tank tail of each ship-shaped flushing tank is provided with a sewage discharge port, and the lower part of the tank tail of each ship-shaped flushing tank is provided with a sewage discharge port. A connecting short pipe is arranged on the drain outlet, two inlets of the three-way pipe joint are respectively connected with the connecting short pipe on the drain outlet, and one outlet of the three-way pipe joint is connected with the drain pipeline through a drain valve. A spraying water pipe fixed below the boiler pulverized coal bunker is further arranged above each ship-shaped flushing tank, and water spraying holes capable of spraying water mist into the ship-shaped flushing tanks are evenly formed in the bottoms of the spraying water pipes at intervals. After the temporary cofferdam is applied, the temporary cofferdam does not need to be piled and dismantled, so that the labor intensity of workers can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler coal powder bunker maintenance, in particular to a sewage discharge system when flushing a boiler coal powder bunker. Background Art

[0002] The boiler pulverized coal bunker is a device for storing pulverized coal to be burned. The exterior is an inverted quadrangular platform-shaped box welded with carbon steel plates, the interior is welded with stainless steel lining plates, moisture absorption pipes are welded on both sides of the top, and there are 2 rows of 8 pulverized coal outlets at the bottom. Each pulverized coal outlet is equipped with a plug switch 3'. Figure 1 described.

[0003] The temperature of the pulverized coal in the pulverized coal bunker is usually 55℃-65℃ when it is running, and the pulverized coal bunker runs 24 hours a day when the boiler is burning. Due to the poor working environment, long-term operation will cause defects such as deformation or cracks of the lining and rust inside the pulverized coal bunker. Once there is a permeability defect, air will enter, which may cause the pulverized coal to spontaneously combust or even explode. In order to prevent the above safety hazards, the inside of the pulverized coal bunker should be regularly inspected and maintained.

[0004] After the boiler is shut down, the inside of the boiler pulverized coal bunker can be inspected, and any air leaks or deformations found should be repaired in time. The pulverized coal bunker must be flushed with water before each inspection to create good conditions for inspection and repair. At present, the flushing work requires bricks and cement to build a square temporary cofferdam around the bottom of the pulverized coal bunker, leaving a drain port, and a rubber hose is pre-buried at the drain port. The end of the rubber hose is connected to the ditch to discharge the washed coal mud and wastewater. After the flushing is completed, the temporary cofferdam needs to be removed for cleaning. Each time a temporary cofferdam is built, one bricklayer and two laborers (to carry materials, sand and cement) are required in one shift. When dismantling, two laborers are required in one shift, resulting in a very high labor intensity every time the pulverized coal bunker is flushed, and cleaning is also very time-consuming and consumes cleaning tools (mops and brooms are basically scrapped after one use). Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a sewage discharge system when flushing a boiler coal powder bunker. After the utility model is applied, there is no need to pile up and dismantle temporary cofferdams, thereby reducing the labor intensity of workers.

[0006] In order to solve the above technical problems, the utility model provides a sewage discharge system for flushing a boiler pulverized coal bin, wherein the bottom of the boiler pulverized coal bin is provided with two rows of pulverized coal outlets, and the number of pulverized coal outlets in each row is four. The sewage discharge system comprises two boat-shaped flushing troughs arranged below the two rows of pulverized coal outlets at the bottom of the boiler pulverized coal bin, and each boat-shaped flushing trough has a sewage outlet at the lower part of the trough tail, and a connecting short pipe is installed on the sewage outlet, and also comprises a three-way pipe joint and a sewage pipeline, and the two inlets of the three-way pipe joint are respectively connected to the connecting short pipe on the sewage outlet, and one outlet is connected to the sewage pipeline through a sewage valve.

[0007] As an improvement of the utility model, a spray water pipe fixed below the boiler pulverized coal bin is also provided above each of the boat-shaped flushing troughs, and water spray holes for spraying water mist into the boat-shaped flushing trough are evenly spaced at the bottom of the spray water pipe.

[0008] Furthermore, a water mist nozzle is installed at the water spray hole at the bottom of the spray water pipe.

[0009] Furthermore, universal rubber wheels are installed at the four corners of the bottom of each boat-shaped flushing tank.

[0010] Furthermore, each of the boat-shaped flushing troughs is made of carbon steel plates, and the thickness of the carbon steel plates is 2 mm.

[0011] Furthermore, each of the boat-shaped flushing troughs is provided with height-adjustable legs on both sides near the four corners of the trough bottom.

[0012] When the utility model is used, two boat-shaped flushing troughs are placed just below two rows of powder outlets at the bottom of the boiler coal powder bin, and the end of the sewage pipeline is connected to the ditch. The coal sludge and waste water generated by flushing the boiler coal powder bin fall into the flushing trough from the powder outlet, and are then discharged into the ditch by the sewage pipeline. After the utility model is applied, there is no need to pile up the cofferdam every time the boiler coal powder bin is inspected and repaired, which reduces the labor intensity of the workers and improves the inspection and repair efficiency of the boiler coal powder bin; after a spray water pipe is arranged above each of the boat-shaped flushing troughs, it is connected to a pressure water source when in use, and the water mist generated can prevent the unmelted coal powder falling from the powder outlet from spreading, which is beneficial to environmental protection and eliminates the safety hazard of flammable coal powder; after universal rubber wheels are installed at the four corners of the bottom of each boat-shaped flushing trough, the movement of the utility model is more convenient, and after height-adjustable legs are installed on both sides of the four corners of the bottom of the trough, the height of the utility model can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the main structure of a boiler pulverized coal bunker in the prior art.

[0015] Figure 2 The utility model is a schematic diagram of the structural composition of a sewage discharge system when flushing a pulverized coal bunker of a boiler.

[0016] Figure 3 yes Figure 2 A-direction view.

[0017] Figure 4 yes Figure 2 B view.

[0018] Figure 5 yes Figure 2The C-direction view shows a spray water pipe of an embodiment, in which a water spray hole is opened at the bottom of the spray water pipe.

[0019] Figure 6 yes Figure 2 The C-direction view shows a spray water pipe in another embodiment, and a water mist nozzle is installed at the bottom of the spray water pipe.

[0020] Figure 7 This is a diagram of the use state of the utility model, and the utility model is placed just below the pulverized coal bin of the boiler. DETAILED DESCRIPTION

[0021] See also Figure 1 - Figure 6 The utility model discloses a sewage discharge system for flushing a coal powder bunker of a boiler. The bottom of the coal powder bunker of the boiler has two rows of coal powder outlets, and the number of the coal powder outlets in each row is four. The sewage discharge system includes two boat-shaped flushing troughs 1 arranged below the two rows of coal powder outlets at the bottom of the coal powder bunker of the boiler. The lower part of the trough tail of each boat-shaped flushing trough has a sewage outlet 2, and a connecting short pipe 3 is installed on the sewage outlet. It also includes a three-way pipe joint 4 and a sewage pipeline 5. The two inlets of the three-way pipe joint are respectively connected to the connecting short pipe on the sewage outlet, and one outlet is connected to the sewage pipeline through a sewage valve 6. A spray water pipe 7 fixed below the coal powder bunker of the boiler is also arranged above each of the boat-shaped flushing troughs 1. The bottom of the spray water pipe is evenly spaced with water spray holes 8 that can spray water mist into the boat-shaped flushing trough. The water spray holes 8 at the bottom of the spray water pipe 7 are equipped with water mist nozzles 9. Universal rubber wheels 10 are installed at the four corners of the bottom of each boat-shaped flushing trough 1. Each of the boat-shaped flushing tanks 1 is made of a carbon steel plate with a thickness of 2 mm. Each of the boat-shaped flushing tanks 1 is provided with height-adjustable legs 11 on both sides near the four corners of the tank bottom.

[0022] Figure 7 This is a diagram of the use state of the utility model, and the utility model is placed just below the pulverized coal bin of the boiler.

[0023] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Any modification or equivalent replacement of the utility model to achieve the same technical effect is within the protection scope of the utility model.

Claims

1. A sewage discharge system for flushing a pulverized coal bunker of a boiler, wherein the bottom of the pulverized coal bunker of the boiler has two rows of pulverized coal outlets, and the number of pulverized coal outlets in each row is 4, characterized in that: The sewage discharge system comprises two boat-shaped flushing troughs (1) arranged below two rows of pulverized coal outlets at the bottom of a boiler pulverized coal bin, each boat-shaped flushing trough having a sewage outlet (2) at the lower part of the trough tail, a connecting short pipe (3) being installed on the sewage outlet, and also comprising a three-way pipe joint (4) and a sewage pipeline (5), two inlets of the three-way pipe joint being respectively connected to the connecting short pipe on the sewage outlet, and one outlet being connected to the sewage pipeline through a sewage valve (6).

2. The wastewater discharge system for flushing a boiler coal powder bunker according to claim 1, characterized in that: A spray water pipe (7) fixed below the boiler coal powder bin is also provided above each of the boat-shaped flushing troughs (1), and water spray holes (8) for spraying water mist into the boat-shaped flushing trough are evenly spaced at the bottom of the spray water pipe.

3. The wastewater discharge system for flushing a boiler coal powder bunker as claimed in claim 2, characterized in that: A water mist nozzle (9) is installed at the water spray hole (8) at the bottom of the spray water pipe (7).

4. The wastewater discharge system for flushing a boiler coal powder bunker according to claim 1, characterized in that: Universal rubber wheels (10) are installed at the four corners of the bottom of each boat-shaped flushing tank (1).

5. The wastewater discharge system for flushing a boiler coal powder bunker according to claim 1, characterized in that: Each of the boat-shaped flushing troughs (1) is made of a carbon steel plate, and the thickness of the carbon steel plate is 2 mm.

6. The wastewater discharge system for flushing a boiler coal powder bunker according to claim 1, characterized in that: Each of the boat-shaped flushing troughs (1) is provided with height-adjustable legs (11) on both sides near the four corners of the trough bottom.

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