Boiler air cooling slag discharge device

Abstract

The utility model discloses a kind of boiler air cooling cold slag discharging devices, it is related to circulating fluidized bed boiler hot slag cooling technical field, located on air distribution plate, including slag pipe, outer sleeve tube, annular baffle plate.The utility model boiler air cooling cold slag discharging device is given wind by jacket, the fluidization of the fluidization insufficient slag drop zone in hearth is carried out, and the fluidization effect of slag drop zone is optimized, and the combustible material with smaller density and higher heat content is separated out, effectively reduce the temperature of slag discharge, prevent the re-ignition of combustible material after falling into slag pipe, cause slag drop to heat up coking, fundamentally solve the problem of circulating fluidized bed boiler slag drop pipe coking blockage, while improving the stability of boiler operation, it can also reduce the carbon content of discharging ash, improve the heat utilization rate of fuel.

Description

Technical Field

[0001] This utility model belongs to the field of circulating fluidized bed boiler hot slag cooling technology, and specifically relates to a boiler air-cooled cold slag discharge device. Background Technology

[0002] The slag discharge pipe (also known as the cold slag pipe) is located at the slag discharge port of the air distribution plate 1, such as... Figure 1 As shown, coking in the ash discharge pipe 2 is a very specific and troublesome problem in the operation of circulating fluidized bed boilers. Coking in this area is extremely harmful, directly interrupting the boiler's ash discharge process, leading to uncontrollable increases in bed pressure (bed differential pressure), inability to renew bed material, and imbalances in the ash-slag ratio, among other operational malfunctions. It not only affects combustion and desulfurization efficiency, but in severe cases, forces boiler shutdown or even complete shutdown. Coking requires manual cleaning, which is labor-intensive and impacts production. Essentially, coking at this location occurs when high-temperature ash, due to poor flow or insufficient cooling, cannot dissipate its heat. Upon entering the ash discharge pipe, it reignites and heats up, causing its temperature to remain above the ash melting point, thus melting and sticking together. Summary of the Invention

[0003] The purpose of this invention is to solve the coking problem at the slag discharge pipe of the furnace bed and to provide a boiler air-cooled cold slag discharge device, which has a simple structure, is easy to process, has low cost, is reliable in operation, is easy to install and convenient to operate.

[0004] The technical solution adopted in this utility model is as follows: The boiler air-cooled slag discharge device is installed on the slag discharge port of the air distribution plate. It includes a slag pipe, an outer sleeve and an annular blocking plate. The slag pipe is located inside the outer sleeve. An annular blocking plate is provided at the upper end of the slag pipe and the outer sleeve to form a jacket. Air outlet holes are opened circumferentially on the upper side walls of the slag pipe and the outer sleeve.

[0005] The outer sleeve is welded to the air distribution plate. One end of the slag pipe extends from the furnace into the slag outlet on the air distribution plate and connects with the slag discharge pipe inside the air box. The outer wall of the slag pipe is welded to the air distribution plate.

[0006] The air distribution plate has an air inlet circumferentially opened around the slag discharge port, and the air inlet is connected to the jacket.

[0007] The center lines of the slag pipe and the outer casing pipe coincide.

[0008] There are four air inlets, which are evenly distributed on the air distribution panel.

[0009] The radial dimension of the air inlet is defined by the slag pipe and the outer casing.

[0010] The air outlets are evenly distributed on the upper sidewalls of the slag pipe and the outer sleeve, and the air outlets are connected to the furnace.

[0011] The air outlet holes of the slag pipe and the air outlet holes of the outer sleeve are axially corresponding.

[0012] The connection between one end of the slag pipe and the slag discharge pipe is by welding.

[0013] The advantages of this utility model are: 1. This utility model has a simple structure, is easy to process, convenient to install, easy to operate, and has low cost; 2. This utility model uses air cooling and fluidization to cool and fluidize the slag falling in the furnace, effectively reducing the temperature of the slag discharge tube and preventing hot slag from coking; 3. While improving the stability of boiler operation, it can also reduce the carbon content of the discharged ash and slag, and improve the thermal utilization rate of fuel. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the background technology of this utility model; Figure 2 This is a cross-sectional view of the working environment of this utility model; Figure 3 yes Figure 2 AA cross-section view; Figure 4 yes Figure 2 BB cross-section; Figure 5 This is a schematic diagram of the overall structure of this utility model; Figure 6 This is a schematic diagram of the slag pipe structure of this utility model; Figure 7 This is a schematic diagram of the outer sleeve structure of this utility model; Figure 8 This is a schematic diagram of an annular blocking plate structure. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] like Figures 2 to 8 As shown, the boiler air-cooled slag discharge device is installed on the slag outlet 5 of the air distribution plate 1. It includes a slag pipe 6, an outer sleeve 7 and an annular blocking plate 8. The slag pipe 6 is located inside the outer sleeve 7. An annular blocking plate 8 is provided at the upper end between the slag pipe 6 and the outer sleeve 7 to form a jacket 9. Air outlet holes 4 are opened circumferentially on the upper side walls of the slag pipe 6 and the outer sleeve 7.

[0017] like Figure 2 As shown, the outer sleeve 7 is welded to the air distribution plate 1, and one end of the slag pipe 6 extends from the furnace into the slag outlet 5 on the air distribution plate 1 and connects with the slag outlet 2 in the wind box. The outer wall of the slag pipe 6 is welded to the air distribution plate 1.

[0018] The air distribution plate 1 has an air inlet 3 circumferentially opened around the slag outlet 5, and the air inlet 3 is connected to the jacket 9.

[0019] like Figure 5 As shown, the center lines of the slag pipe 6 and the outer casing 7 coincide.

[0020] like Figure 3 As shown, there are 4 air inlets 3, which are evenly distributed on the air distribution plate 1.

[0021] like Figure 2 As shown, the radial dimension of the air inlet 3 is bounded by the slag pipe 6 and the outer casing 7.

[0022] like Figure 4 As shown, the air outlets 4 are evenly distributed on the upper sidewalls of the slag pipe 6 and the outer sleeve 7, and the air outlets 4 are connected to the furnace.

[0023] The air outlet 4 of the slag pipe 6 and the air outlet 4 of the outer sleeve 7 are axially correspondingly distributed.

[0024] The connection between one end of the slag pipe 6 and the slag discharge pipe 2 is by welding, which provides good sealing.

[0025] In operation, the cold air in the bellows enters the jacket 9 of the boiler air-cooled slag discharge device through the air inlet 3 on the air distribution plate 1, and is then sent into the furnace through the upper inner and outer double air outlets 4. The hot slag in the furnace enters the slag discharge port 5, and after being cooled by the boiler air-cooled slag discharge device, it is discharged through the slag pipe 2.

[0026] The working principle of this utility model is as follows: The temperature of the hot slag in the furnace before entering the slag discharge port is close to the ash melting point. If the fluidization effect is poor, heat will focus and coking will occur. This invention uses cold air to exchange heat with the hot slag, cooling the high-temperature hot slag and keeping its temperature below the ash melting point, effectively preventing the hot slag from melting and sticking. At the same time, the jacketed air supply technology optimizes the fluidization effect in the slag discharge zone, separating the less dense and high-calorific-content combustibles and sending them back to the furnace. This prevents the combustibles from reigniting after falling into the slag tube, causing local heat accumulation and avoiding rapid heating of the slag to form coke. This solves the problem of coking and clogging in the slag discharge pipe of a circulating fluidized bed boiler.

Claims

1. A boiler air-cooled slag discharge device, installed on the slag outlet (5) of the air distribution plate (1), characterized in that: It includes a slag pipe (6), an outer sleeve (7) and an annular plug (8). The slag pipe (6) is located inside the outer sleeve (7). An annular plug (8) is provided at the upper end between the slag pipe (6) and the outer sleeve (7) to form a jacket (9). Air outlet holes (4) are opened circumferentially on the upper sidewalls of the slag pipe (6) and the outer sleeve (7).

2. The boiler air-cooled slag discharge device as described in claim 1, characterized in that: The outer sleeve (7) is welded to the air distribution plate (1). One end of the slag pipe (6) extends from the furnace into the slag outlet (5) on the air distribution plate (1) and connects with the slag pipe (2) inside the wind box. The outer wall of the slag pipe (6) is welded to the air distribution plate (1).

3. The boiler air-cooled slag discharge device as described in claim 1 or 2, characterized in that: The air distribution plate (1) has an air inlet (3) circumferentially opened around the slag outlet (5), and the air inlet (3) is connected to the jacket (9).

4. The boiler air-cooled slag discharge device as described in claim 1, characterized in that: The center lines of the slag pipe (6) and the outer casing (7) coincide.

5. The boiler air-cooled slag discharge device as described in claim 3, characterized in that: There are four air inlets (3), which are evenly distributed on the air distribution plate (1).

6. The boiler air-cooled slag discharge device as described in claim 3, characterized in that: The radial dimension of the air inlet (3) is bounded by the slag pipe (6) and the outer casing (7).

7. The boiler air-cooled slag discharge device as described in claim 1, characterized in that: The air outlets (4) are evenly distributed on the upper sidewalls of the slag pipe (6) and the outer sleeve (7), and the air outlets (4) are connected to the furnace.

8. The boiler air-cooled slag discharge device as described in claim 1, characterized in that: The air outlet (4) of the slag pipe (6) and the air outlet (4) of the outer sleeve (7) are axially correspondingly distributed.

9. The boiler air-cooled slag discharge device as described in claim 2, characterized in that: The connection between one end of the slag pipe (6) and the slag discharge pipe (2) is by welding.

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