A slag cooling and waste heat recovery system

Abstract

A kind of slag cooling and waste heat recovery system, including hopper slag bin, distribution-off valve, slag cooling bin, upper air inlet pipeline, upper air inlet damper, air outlet pipeline, dust collector, dust-removed hot air pipeline, air-water heat exchanger, cooling air pipeline, fan, bearing seat, bearing, rotating shaft, the load-bearing plate that is provided with several airflow holes, one end is fixedly connected with rotating shaft, and can be rotated with rotating shaft and be inclined to unload downward, fixed seat, load-bearing plate drive cylinder being hingedly connected with fixed seat by first movable pin, load-bearing plate piston rod, connecting rod being hingedly connected with load-bearing plate piston rod end by second movable pin and being connected with middle part of load-bearing plate, lower air inlet pipeline, lower air inlet damper.The present application is environmental protection, will not produce greenhouse effect, cooling is sufficient, heat exchange efficiency is high, high-temperature slag waste heat recycling.It can be widely applied in the field of coal-fired boiler slag cooling and waste heat recovery.

Description

Technical Field

[0001] This invention relates to a slag cooling and waste heat recovery system, which can be widely used in the field of slag cooling and waste heat recovery in coal-fired boilers. Background Technology

[0002] Traditional dry ash removal systems rely on the boiler's negative pressure to draw in no more than 1% of the total combustion air into the ash dryer, cooling the slag on the conveyor belt. The heated cooling air then enters the furnace. However, the cooling air drawn into the dryer only exchanges heat with the surface of the bottom ash, resulting in insufficient heat exchange. Simultaneously, due to factors such as deteriorating coal quality, soot blowing, and co-firing, the amount of bottom ash increases, the conveyor belt speed increases, the cooling time for the bottom ash is short, the airflow cannot meet the cooling requirements, the ash discharge temperature is high, the residual carbon content of the ash is high, the ash activity is low, and the failure rate of subsequent equipment is high. Furthermore, the cooling air entering the furnace at a temperature below the expected level leads to a decrease in boiler efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide an environmentally friendly slag cooling and waste heat recovery system that does not produce a greenhouse effect, provides sufficient cooling, has high heat exchange efficiency, and recovers and utilizes the waste heat of high-temperature slag.

[0004] To achieve the above objectives, the present invention provides a slag cooling and waste heat recovery system, comprising a bucket-type slag silo with a flange at the bottom for storing high-temperature slag, a material distribution shut-off valve with flanges at the top and bottom and fastened to the bottom flange of the bucket-type slag silo by flange fastening bolts, a slag cooling chamber with a flange at the top and fastened to the lower flange of the material distribution shut-off valve by flange fastening bolts, an upper air inlet duct installed on one side of the slag cooling chamber, an upper air inlet damper connected to the upper air inlet duct, an air outlet duct installed on the other side of the slag cooling chamber, a dust collector connected to the air outlet duct and a fine ash discharge duct at the bottom, a dust collector hot air duct inserted into the dust collector and installed on the top surface of the dust collector, a water-air heat exchanger connected to the hot air duct, and a line-connected water-air heat exchanger. The system includes a cooling air duct, a fan connected to the cooling air duct for discharging cooling air into the atmosphere, two bearing seats bolted to the outer walls of the front and rear of the slag cooling chamber, a bearing mounted on each bearing seat, a rotating shaft mounted on the two bearings, a bearing plate with several airflow holes, one end fixedly connected to the rotating shaft and capable of tilting downwards to discharge material as the rotating shaft rotates, a fixed seat mounted on the inner wall of the slag cooling chamber, a bearing plate drive cylinder hinged to the fixed seat via a first movable pin, a bearing plate piston rod mounted on the bearing plate drive cylinder, a connecting rod hinged to the end of the bearing plate piston rod via a second movable pin and connected to the middle of the bearing plate, a lower air inlet duct located below the bearing plate and mounted on one side of the slag cooling chamber, and a lower air inlet damper connected to the lower air inlet duct.

[0005] The present invention discloses a slag cooling and waste heat recovery system, wherein the air-water heat exchanger is a finned tube heat exchanger.

[0006] The present invention discloses a slag cooling and waste heat recovery system, wherein the airflow holes of the bearing plate are narrow at the top and wide at the bottom.

[0007] The present invention discloses a slag cooling and waste heat recovery system, wherein the upper narrow and lower wide hole is a conical hole.

[0008] The present invention discloses a slag cooling and waste heat recovery system. The material distribution shut-off valve includes a door frame connected to a bucket slag bin and a slag cooling bin by flange fastening bolts, a door drive cylinder installed on the door frame, a door body with a material distribution groove installed on the door frame, and a door piston rod installed in the door drive cylinder and hinged to the door body at its end by a pin.

[0009] The present invention provides a slag cooling and waste heat recovery system, wherein the material distribution trough has a rectangular structure.

[0010] The present invention discloses a slag cooling and waste heat recovery system, the working principle of which is as follows:

[0011] (1) During operation, high-temperature slag enters the bucket slag bin. Under the action of the gate drive cylinder of the material distribution shut-off valve, the gate piston rod drives the gate with the material distribution groove to move left and right. Through the material distribution action of the material distribution shut-off valve, the slag enters the slag cooling bin below. The slag material falls onto the bearing plate with the material drop hole. Cooling air is input through the upper and lower air inlet pipes located above and below the bearing plate to cool the slag on the bearing plate. The lower cooling air penetrates the hot slag through the airflow hole, and the upper cooling air exchanges heat with the surface of the hot slag. One end of the bearing plate is welded to the rotating shaft. Bearing seats are provided at both ends of the rotating shaft. The bearing seats are fixed to the front and rear outer walls of the slag cooling bin body by bolts. The bearing plate can swing up and down with the rotating shaft. Under the action of the bearing plate drive cylinder, the bearing plate piston rod drives the connecting rod, and the connecting rod drives the bearing plate. When the bearing plate rotates to the horizontal state, it can carry the slag above. When the bearing plate tilts downward, the slag spread on the top is poured down, realizing the material drop.

[0012] (2) The cooling air after heat exchange with the high-temperature slag becomes high-temperature hot air. Under the action of airflow, it enters the dust collector together with the fly ash. The fine ash after dust removal is discharged from the bottom of the dust collector. The dust removal effect is obvious and environmentally friendly. The hot air after dust removal enters the air-water heat exchanger, and the waste heat is utilized. The hot water after heat exchange is used by people. The cooled air is discharged into the atmosphere through the fan, which will not produce the greenhouse effect.

[0013] The present invention discloses a slag cooling and waste heat recovery system, wherein the airflow holes of the bearing plate are tapered holes that are narrow at the top and wide at the bottom, which facilitates the accelerated passage of the lower cooling airflow through the holes and into the upper part of the bearing plate to cool the slag material.

[0014] This invention discloses a slag cooling and waste heat recovery system. It employs independent air distribution, introducing cooling air in two paths: one path penetrates the hot slag, while the other path exchanges heat with the surface of the hot slag. After heat exchange, the air undergoes dust removal, and waste heat is recovered before being discharged. The high-temperature slag is directly cooled by the cooling air, and the slag on the support plate is cooled from both the top and bottom surfaces, resulting in thorough cooling and high heat exchange efficiency. This solves the problems of insufficient surface heat exchange in traditional air-cooled systems.

[0015] This invention discloses a slag cooling and waste heat recovery system. High-temperature slag is directly cooled by cooling air to generate hot air. The hot air is then recovered and utilized through a wind-water heat exchanger. The hot water obtained after heat exchange is then supplied to people for use. Thus, the purpose of waste heat utilization is achieved, and heat waste is reduced.

[0016] This invention discloses a slag cooling and waste heat recovery system. A material distribution trough is located in the center of the door. When the material distribution trough is directly below the bucket slag bin, it performs the function of material distribution. When the door is slowly pushed or pulled, the material distribution trough passes through the door frame at a uniform speed, and the slag above falls evenly and in equal amounts, so that the material is spread flat on the bearing plate. When the material distribution trough is outside the bucket slag bin, it is in the closed state.

[0017] In summary, the slag cooling and waste heat recovery system of the present invention is environmentally friendly, does not produce a greenhouse effect, provides sufficient cooling, has high heat exchange efficiency, and recovers and utilizes waste heat from high-temperature slag. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 yes Figure 1 AA view in the middle;

[0021] Figure 3 yes Figure 2 BB view in the middle;

[0022] Figure 4 yes Figure 1 A schematic diagram of the material distribution shut-off valve structure in the middle;

[0023] Figure 5 yes Figure 4 Top view. Detailed Implementation

[0024] exist Figures 1-5This invention discloses a slag cooling and waste heat recovery system, comprising a bucket-type slag silo 1 with a flange at the bottom for storing high-temperature slag, a material distribution shut-off valve 2 with flanges at the top and bottom and fastened to the bottom flange of the bucket-type slag silo by flange fastening bolts, a slag cooling chamber 3 with a flange at the top and fastened to the lower flange of the material distribution shut-off valve by flange fastening bolts, an upper air inlet duct 4 installed on one side of the slag cooling chamber, an upper air inlet damper 5 connected to the upper air inlet duct, an air outlet duct 6 installed on the other side of the slag cooling chamber, a dust collector 7 with a fine ash discharge duct 22 at the bottom and connected to the air outlet duct, a hot air duct 8 inserted into the dust collector and installed on the top surface of the dust collector, a water-air heat exchanger 9 connected to the hot air duct, a cooling air duct 10 connected to the water-air heat exchanger, and a cooling air duct 10 connected to the cooling air duct. A fan 11 connected to a cooling duct for discharging cooling air into the atmosphere; two bearing seats 12 bolted to the outer walls of the front and rear of the slag cooling chamber; a bearing 13 mounted on each bearing seat; a rotating shaft 14 mounted on the two bearings; a bearing plate 15 with several airflow holes a, one end fixedly connected to the rotating shaft and tilting downwards to discharge material as the rotating shaft rotates; a fixed seat 16 mounted on the inner wall of the slag cooling chamber; a bearing plate drive cylinder 17 hinged to the fixed seat via a first movable pin 23; a bearing plate piston rod 18 mounted on the bearing plate drive cylinder; a connecting rod 19 hinged to the end of the bearing plate piston rod via a second movable pin 24 and connected to the middle of the bearing plate; a lower air inlet duct 20 located below the bearing plate and mounted on one side of the slag cooling chamber; and a lower air inlet damper 21 connected to the lower air inlet duct.

[0025] The present invention discloses a slag cooling and waste heat recovery system, wherein the bearing plate drive cylinder is a hydraulic drive cylinder or a pneumatic drive cylinder.

[0026] The present invention provides a slag cooling and waste heat recovery system, wherein the air-water heat exchanger 9 is a finned tube heat exchanger.

[0027] The present invention discloses a slag cooling and waste heat recovery system, wherein the airflow holes of the bearing plate are narrow at the top and wide at the bottom.

[0028] The present invention discloses a slag cooling and waste heat recovery system, wherein the upper narrow and lower wide hole is a conical hole.

[0029] The present invention discloses a slag cooling and waste heat recovery system. The material distribution shut-off valve 2 includes a door frame 2-1 connected to a bucket slag bin and a slag cooling bin by flange fastening bolts, a door drive cylinder 2-2 installed on the door frame, a door body 2-3 with a material distribution groove b installed on the door frame, and a door piston rod 2-4 installed in the door drive cylinder and hinged to the door body at its end by a pin 2-5.

[0030] The present invention provides a slag cooling and waste heat recovery system, wherein the material distribution trough has a rectangular structure.

[0031] The present invention discloses a slag cooling and waste heat recovery system, wherein the door drive cylinder is a hydraulic drive cylinder or a pneumatic drive cylinder.

[0032] In addition, Figure 1 In the diagram, the slag flow direction is c, the air flow direction is d, the water flow direction is e, and the airflow direction is f.

[0033] This invention discloses a slag cooling and waste heat recovery system. The above description is merely a preferred embodiment of the invention and is not intended to limit the invention in any way. Although the invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the invention, based on the technical essence of the invention, and within the spirit and principles of the invention, shall still fall within the protection scope of the invention.

Claims

1. A slag cooling and waste heat recovery system, characterized in that, This includes a bucket-type slag silo with a flange at the bottom for storing high-temperature slag; a material distribution shut-off valve with flanges at the top and bottom, fastened to the bottom flange of the bucket-type slag silo by flange bolts; a slag cooling silo with a flange at the top, fastened to the lower flange of the material distribution shut-off valve by flange bolts; an upper air inlet duct installed on one side of the slag cooling silo; an upper air inlet damper connected to the upper air inlet duct; an air outlet duct installed on the other side of the slag cooling silo; a dust collector with a fine ash discharge duct at the bottom connected to the air outlet duct; a hot air duct after dust removal installed on the top surface of the dust collector; a water-air heat exchanger connected to the hot air duct after dust removal; a cooling air duct connected to the water-air heat exchanger; and a cooling air pipe. A fan connected to the slag cooling chamber for discharging cooling air into the atmosphere; two bearing seats bolted to the outer walls of the front and rear of the slag cooling chamber; a bearing mounted on each bearing seat; a rotating shaft mounted on the two bearings; a bearing plate with several airflow holes, one end fixedly connected to the rotating shaft and tilting downwards to discharge material as the rotating shaft rotates; a fixed seat mounted on the inner wall of the slag cooling chamber; a bearing plate drive cylinder hinged to the fixed seat via a first movable pin; a bearing plate piston rod mounted on the bearing plate drive cylinder; a connecting rod hinged to the end of the bearing plate piston rod via a second movable pin and connected to the middle of the bearing plate; a lower air inlet duct located below the bearing plate and mounted on one side of the slag cooling chamber; and a lower air inlet damper connected to the lower air inlet duct.

2. The slag cooling and waste heat recovery system according to claim 1, characterized in that, The aforementioned air-water heat exchanger is a finned tube heat exchanger.

3. The slag cooling and waste heat recovery system according to claim 1, characterized in that, The airflow holes in the bearing plate are narrow at the top and wide at the bottom.

4. The slag cooling and waste heat recovery system according to claim 3, characterized in that, The aforementioned hole, which is narrower at the top and wider at the bottom, is a tapered hole.

5. The slag cooling and waste heat recovery system according to claim 1, characterized in that, The aforementioned material distribution shut-off valve includes a door frame connected to a bucket slag bin and a slag cooling bin via flange fastening bolts, a door drive cylinder mounted on the door frame, a door body with a material distribution trough mounted on the door frame, and a door piston rod mounted inside the door drive cylinder and hinged to the door body at its end via a pin.

6. The slag cooling and waste heat recovery system according to claim 5, characterized in that, The material distribution trough has a rectangular structure.

Images