KR20180064032A - Combustion grate system with contiunuous operation structure - Google Patents

Abstract

Provided is a system for burning solid fuel using a grate with a continuous operation structure. The combustion system comprises: an input means (10) for conveying solid fuel of an input hopper (12) to an input conveyer (16); a main body (20) connected to the downstream side of the input means (10) and having a passage for allowing a flow of air and discharge of ashes; a grate mounted in the main body (20) in an infinite circulation manner and having a uniform feeder (34) and a combustion promoter (36); an ash discharging means (40) mounted at one side of the main body (20) to discharge ashes to the outside; and a control means (50) for controlling combustion of solid fuel and discharge of ashes through a preset algorithm. Therefore, grate combustion system can promote productivity by reduction of labor since inducing a smooth discharge of the generated ashes while keeping the optimum speed according to states of various solid fuels in performing continuous operation of grate combustion.

Description

[0001] Combustion grate system with contiunuous operation structure [

The present invention relates to a grate combustion system, and more particularly, to a continuous operation type grate combustion system for burning various types of solid fuel on a circulating endless track.

Generally, a grate burner is mainly used for a small-sized industrial solid fuel combustion apparatus. The grate combustion can be realized by burning solid fuel such as SRF such as waste wood, bio SRF such as wood chip, wood pellet, coal, etc., on the basis of infinite orbital transfer.

In connection with this, reference may be made to the following Korean Utility Model Registration No. 0367184 (Prior Art 1) and Korean Patent Registration No. 1620960 (Prior Art 2).

The prior art document 1 is automatically loaded and conveyed by a chain conveyor, the granular coal loaded on the chain conveyor is gradually preheated in accordance with the set speed, continuously burned while being conveyed to heat the heat exchanger, It is automatically dropped into the recovery chamber and recovered. Thus, it is expected that the granular coal is burned very uniformly, and the combustion efficiency is increased.

The prior art document 2 is composed of a hopper, a conveyor for injecting fuel, a grate, a burner, a uniform injecting part, a combustion gas discharging port, a re-discharging conveyor and the like. Thereby promoting the combustion of the fuel. Thus, the complete combustion of the fuel can be accomplished, thereby improving the combustion efficiency.

However, according to the above-mentioned prior art, it is difficult to realize a process of maintaining the optimum speed in response to the state of the solid fuel, and in the process of continuous operation, a large amount of manual work for batch processing is required, .

1. Korean Registered Utility Model No. 0367184 "Particulate coal boiler" (Open date: November 11, 2004) 2. Korean Patent Registration No. 1620960 entitled "Circulating Grate Burner" (Open date: 2015.05.13.)

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems of the prior art by providing continuous operation based on a circulating infinite orbit, thereby enabling smooth discharge of ash generated while maintaining an optimum speed corresponding to various solid fuel states And to provide a continuous operation type grate burning system capable of saving power.

In order to achieve the above object, the present invention provides a system for burning a solid fuel with a continuous operation type grate, comprising: input means for transferring the solid fuel of the input hopper to the input conveyor; A main body connected to the downstream side of the introducing means and having an air flow and a ash discharge path; A grate provided in the main body in an infinite circulation manner and having a uniform injector and a combustion promoter; Ash discharge means installed to discharge the ash to the outside at one side of the main body; And control means for controlling the combustion and the ash discharge state of the solid fuel with an established algorithm.

As a detailed configuration of the present invention, the charging means is provided with a screw conveyor for causing stirring of the solid fuel to the bottom surface of the charging hopper.

According to a modification of the present invention, the main body further includes a hot-air dryer that causes waste heat accumulated inside or discharged to the outside to be supplied to the charging means to cause evaporation of moisture of the solid fuel.

In the detailed construction of the present invention, the ash discharge means includes a discharge hopper dispersed in a large number at a lower portion of the grate, and a screw conveyer connected to a lower side of the discharge hopper to transfer the ash.

In a variant of the invention, at least one of the discharge hoppers further comprises a rotary brush for forcibly separating ash from the grate.

The control means includes a level detector for detecting the amount of charged solid fuel, a temperature detector for detecting the combustion temperature on the grate, a speed detector for detecting the speed from the introduction of the solid fuel to the discharge, And a controller for storing and executing the program.

In the detailed construction of the present invention, the control means causes fluctuation of the operation speed of the input conveyor, the discharge conveyor, and the grate in accordance with the input amount of the solid fuel and the combustion temperature.

As described above, according to the present invention, the continuous operation of the grate burning is performed, so that the smooth discharge of the ash generated while maintaining the optimum speed corresponding to the state of various solid fuels is induced, .

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic view showing a grate combustion system according to the present invention;
Figure 2 is a schematic representation of a system according to the invention in plan view
Figure 3 is a schematic representation of a system according to the present invention,
4 is a block diagram illustrating a system according to a modification of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention proposes a system for burning solid fuel with a continuous operation type grate. The continuous operation mode can be implemented with a structure in which the grate is circulated in an infinite orbit. FIG. 1 illustrates the submerged combustion, which is most commonly used for grate combustion, in which the transfer of solid fuel and the flow of combustion air are in opposite directions. Of course, the present invention is not limited to the schemes shown in the drawings.

According to the present invention, the charging means (10) has a structure for transferring the solid fuel of the charging hopper (12) to the charging conveyor (16). The charging means 10 transfers the solid fuel loaded on the charging hopper 12 upward onto the charging conveyor 16 and puts it on the upper side of the main body 20 to be described later. The input conveyor 16 is constructed in such a manner that a constant amount of fuel is maintained regardless of the type of the solid fuel.

In a detailed construction of the present invention, the charging means (10) is provided with a screw conveyor (14) for causing stirring of the solid fuel to the bottom surface of the charging hopper (12). The adhesive force varies depending on the type (physical property) of the solid fuel loaded in the hopper 12, and the higher the particulate content, the more the aggregation is carried out in the form of a lump. As shown in FIG. 1, the feed hopper 12 and the feed conveyor 16 are spaced apart from each other and a screw conveyor 14 is installed at the lower end of the feed hopper 12. The screw conveyor 14 is provided with a structure for conveying the solid fuel while stirring it, and feeds the solid fuel that has not been agglomerated to the input conveyor 16 in a uniform state.

According to the present invention, the main body 20 having the air flow and the ash discharge path is connected to the downstream side of the charging means 10. The main body 20 has a structure in which the combustion furnace 21 is formed by using a heat insulating material, and has a fuel inlet on the upstream side and an air inlet 22 on the downstream side. A gas outlet 23 is formed on the upper side of the main body 20 and a discharge chute 25 is connected adjacent to the air inlet 22. The discharge chute 25 discharges the ash and the like to the outside in conjunction with the discharge conveyor 26 disposed at the lower side. The unreleased ash is moved to the upstream side and is recovered to the receiving cylinder 27 adjacent to the fuel inlet.

On the other hand, the air inlet 22 may include a duct and a damper for supplying combustion air to a plurality of points on the grate 30 described later. The damper is provided with an actuator capable of adjusting the air amount by electrical control.

According to the present invention, the grate 30 having the uniform injector 34 and the combustion promoter 36 is installed in the main body 20 in an endless circulation manner. The grate 30 formed in an endless track is disposed between the fuel inlet and the air inlet 22 and has a uniform injector 34 and a combustion promoter 36 on the upstream and downstream sides of the burner 32, respectively. The uniform injector 34 and the combustion promoter 36 are formed in a structure having a plurality of blades on the rotating shaft. The uniform injector 34 keeps the injection height of the solid fuel constant, and the combustion promoter 36 induces complete combustion by smooth contact of the combustion air.

According to the present invention, the ash discharging means (40) is installed on one side of the main body (20) to discharge the ash to the outside. The ash discharge means 40 is installed close to the grate 30 to remove the ash so that the ash is not injected again into the combustion stage. The ash is ultimately collected in the receiving cylinder 27 disposed on the upstream side of the grate 30, but processing the ash of the receiving cylinder 27 reduces the productivity because it requires attraction.

The batch discharging means 40 includes a discharge hopper 42 dispersed in a large number at a lower portion of the grate 30, a screw connected to the lower side of the discharge hopper 42 for conveying the ash, And an air supply device (44). In FIG. 1, four discharge hoppers 42 are arranged along the entire length of the grate 30. Dispersing the discharge hopper 42 is advantageous in preventing ashing of the ash. A screw conveyor 44 is connected to the lower end of each discharge hopper 42 to send the ash to the discharge chute 25. The ash introduced into the screw conveyor 44 from the plurality of discharge hoppers 42 can be smoothly conveyed without being agglomerated. Therefore, even if the capacity of the receiving cylinder 27 is greatly reduced, the airflow due to the ash removal does not increase.

In a variant of the invention, at least one of the discharge hoppers 42 further comprises a rotary brush 46 for forcibly separating ash from the grate 30. 4 illustrates a state in which the rotary brush 46 is installed on the discharge hopper 42 located at the most downstream side. The rotary brush 46 dislodges the remaining ashes that are applied to the cleaning moratorium grate 30 that travels in a direction opposite to the grate 30. The cleaning brush of the rotary brush 46 is formed of a material having high strength, high elasticity, abrasion resistance, and heat resistance.

The solid fuel of the coal component is heated by the heat of the combustion gas and the radiant heat of the combustion furnace 21 to cause evaporation of moisture in the fuel at a temperature of about 110 ° C. When the temperature exceeds 200 ° C., Gas). When the temperature suddenly rises due to combustion and reaches about 900 ° C., the flow of volatile components is terminated but sufficient combustion air is supplied to the heated layer to complete combustion. The ash remaining in the ash falls from the standing state of the grate 30 and is removed by the ash discharge means 40.

As a modification of the present invention, the main body 20 further comprises a hot-air dryer 38 for sending waste heat accumulated in the outside or discharged to the inputting means 10 to cause evaporation of moisture of the solid fuel do. The hot air dryer 38 utilizes waste heat discharged to the gas discharge port 23 or waste heat generated in the discharge hopper 42 and the screw transfer device 44 so as not to affect the combustion on the grate 30. The hot air dryer 38 transfers heat medium such as air heated by the waste heat to the solid fuel on the screw conveyor 14 or the input conveyor 16 to cause water evaporation due to preheating.

Further, according to the present invention, the control means (50) controls the combustion and the ash discharge state of the solid fuel by an established algorithm. The control means 50 is based on a microprocessor, a memory, and a controller 56 equipped with an input / output interface. A series of operating algorithms, from combustion of solid fuel to ash discharge, are stored and updated in memory. A temperature detector 53 and a speed detector 54 are connected to the input interface and a screw conveyor 14, an input conveyor 16, a grate 30, And a motor (not shown) for driving the screw conveyor 44 and the like are connected.

The control means 50 includes level detectors 51 and 52 for detecting the amount of charged solid fuel, a temperature detector 53 for detecting the combustion temperature on the grate 30, A speed detector 54 for detecting the speed from the input to the discharge, and a controller 56 for storing and executing the set algorithm. The level detectors 51 and 52 are installed at the upstream end of the grate 30 to detect the upper limit height and the lower limit height of the solid fuel. Although the level detectors 51 and 52 do not exclude a non-contact type such as a laser sensor, a contact type such as a limit switch is preferred in consideration of a high temperature and dusty environment. The temperature detector 53 detects the combustion temperature at a plurality of points including the grate 30 upstream and downstream. The speed detector 54 detects the speed of the motor connected to the output interface of the controller 56 described above.

As a detailed configuration of the present invention, the control means (50) controls the operation speed of the input conveyor (16), the discharge conveyor (26) and the grate (30) in response to the input amount of the solid fuel and the combustion temperature . When a signal indicating that the amount of the solid fuel injected is too low is generated in the low level detector 51, the speed of the screw conveyor 14 and the input conveyor 16 is increased. When a signal indicating that the amount of the solid fuel injected is excessive in the high level detector 52 The screw conveyor 14 and the input conveyor 16 are decelerated or stopped. The combustion temperature gradient of the grate 30 according to the physical properties of the solid fuel to be injected is predetermined and stored in the memory of the controller 56. [ If it is determined that the combustion temperature gradient is not appropriate due to the signal from the temperature detector 53, the moving speed of the grate 30 is changed and accordingly, the screw conveyor 14 and the input conveyor 16 also induce temporary shifting. Thus, the controller 56 can realize the flexibility of process control corresponding to the physical properties of the solid fuel to be injected.

The controller 56 controls the screw conveyor 44 in such a manner that the screw conveyor 44 and the grate 30 are operated in the same manner as the screw conveyor 44, Speed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

10: Feeding means 12: Feeding hopper
14: Screw conveyor 16: Feed conveyor
20: main body 21: combustion furnace
22: air inlet 23: gas outlet
25: Discharge chute 26: Discharge conveyor
30: Grate 32: Burner
34: uniform injector 36: combustion promoter
38: hot air dryer 40: ash discharge means
42: Exhaust hopper 44: Screw conveyor
46: rotary brush 50: control means
51, 52: level detector 53: temperature detector
54: speed detector 56: controller

Claims (7)

CLAIMS What is claimed is: 1. A system for burning solid fuel with a continuous operation grate comprising:
A feeding means (10) for feeding the solid fuel of the feeding hopper (12) to the feed conveyor (16);
A main body 20 connected to the downstream side of the input means 10 and having an air flow and a ash discharge path;
A grate 30 installed in the main body 20 in an endless circulation manner and having a uniform injector 34 and a combustion promoter 36;
Ash discharge means (40) installed on one side of the main body (20) to discharge the ash to the outside; And
And control means (50) for controlling the combustion and the ash discharge state of the solid fuel with an established algorithm. The method according to claim 1,
Characterized in that the charging means (10) comprises a screw conveyor (14) for causing stirring of the solid fuel to the bottom surface of the charging hopper (12). The method according to claim 1,
Wherein the main body (20) further comprises a hot-air dryer (38) for sending waste heat accumulated in the outside or discharged to the inputting means (10) to cause evaporation of moisture of the solid fuel. system. The method according to claim 1,
The batch discharge means 40 includes a discharge hopper 42 which is installed at a lower portion of the grate 30 and is installed to be dispersed in a large number and a screw conveyor 44 connected to a lower side of the discharge hopper 42 to transfer the ash Wherein the grate combustion system is a continuously operating type grate combustion system. The method of claim 4,
Wherein at least one of the discharge hoppers (42) further comprises a rotary brush (46) for forcibly separating the ash from the grate (30). The method according to claim 1,
The control means 50 includes level detectors 51 and 52 for detecting the amount of charged solid fuel, a temperature detector 53 for detecting the combustion temperature on the grate 30, And a controller (56) for storing and executing the set algorithm. ≪ Desc / Clms Page number 19 > The method according to claim 1,
Characterized in that the control means (50) causes the operation speed of the input conveyor (16), the discharge conveyor (26) and the grate (30) to fluctuate in accordance with the input amount of the solid fuel and the combustion temperature. Grate burning system.

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