Grate type combustion furnace

Abstract

The utility model provides a grate type combustion furnace which comprises a furnace body, a cavity is arranged in the furnace body, an ignition mechanism is arranged in the cavity, an air supply port, a fuel feeding port and a high-temperature smoke outlet are arranged on the furnace body, and the grate type combustion furnace is characterized in that a plurality of layers of grate plates which are sequentially overlapped in a staggered mode are arranged in the cavity of the furnace body from top to bottom, and the high-position ends of the plurality of layers of grate plates are connected with the fuel feeding port. The rest of the grid plates extend towards the high-temperature flue gas outlet, the heights of the grid plates are reduced layer by layer, a plurality of air holes are formed in the grid plates, the multiple layers of grid plates are connected with a translation driving mechanism, and the air holes are connected with external air supply equipment through an air supply mechanism. The horizontal moving driving mechanism drives the multiple layers of grid plates to stretch and retract forwards and backwards, so that fuel on the multiple layers of grid plates can continuously move from the fuel feeding port to the high-temperature flue gas outlet and is evenly laid on each layer of grid plates. Hot air supplied by external air supply equipment can be introduced into the cavity through the air holes, so that fuel continuously floats in the furnace body, and the effects of uniform preheating and uniform combustion are achieved. The quick separation of volatile components in the biomass fuel is improved, the combustion efficiency of the fuel can be improved, and the generation and emission of harmful substances are reduced.

Description

Technical Field

[0001] The utility model relates to a combustion furnace, in particular to a grate type combustion furnace, belonging to the technical field of metallurgy and chemical industry. Background Art

[0002] In the decomposition furnace connected to the cement rotary kiln, limestone is gradually decomposed into calcium carbonate at high temperature, and then decomposed into calcium oxide and carbon dioxide. This process is an exothermic reaction, and its thermodynamic principle is: the decomposition reaction is completed by the reduction of the oxide. Since the decomposition reaction requires thermal energy, the thermal energy provided by the decomposition reaction is obtained by burning fuel in the combustion furnace. Usually, the combustion of the fuel occurs under intense turbulent conditions, and the entire combustion furnace almost becomes a combustion zone, and the combustion is in a state of low-temperature flameless combustion at 820 to 900 ° C. At present, the above-mentioned combustion furnace mainly uses coal as fuel. Since a large amount of smoke and toxic and harmful gases will be generated when coal is burned, it is very easy to cause serious pollution to the environment. Therefore, enterprises have to build complex filtration systems to recycle and filter flue gas, resulting in an increase in land costs and construction costs, which brings unnecessary economic burdens to enterprises.

[0003] With the continuous development of science and technology, green and environmentally friendly biomass fuels and RDF fuels have begun to gradually replace traditional coal fuels for use in combustion furnaces. When burning, biomass fuels will precipitate a large amount of volatile components to participate in and promote combustion. In order to increase the rapid precipitation of volatile components, the biomass combustion furnace will introduce hot air to preheat the fuel. At the same time, the biomass fuel needs to be spread flat in the furnace to increase the contact area between the fuel and the hot air and play a role in uniform combustion. The existing biomass combustion furnace transports and spreads the fuel by setting a conveying mechanism in the furnace. Its complex structure causes the failure rate to continue to rise, forcing the company to frequently stop the furnace to repair and maintain the conveying mechanism. In addition, the hot air introduced by the existing biomass combustion furnace can only preheat the surface fuel, and the preheating effect on the bottom fuel is poor. There is also the problem of incomplete combustion when the fuel burns, which not only causes a large waste of resources, but also incomplete combustion increases the risk of toxic and harmful gases. Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] In order to solve the problems of the existing biomass combustion furnaces, such as complex structure, high failure rate, insufficient fuel preheating and incomplete combustion, the utility model provides a grate type combustion furnace.

[0005] The utility model is completed by the following technical scheme: a grate type combustion furnace, including a furnace body, a cavity is arranged in the furnace body, an ignition mechanism is arranged in the cavity, an air supply port, a fuel feed port, and a high-temperature flue gas outlet are arranged on the furnace body, and the utility model is characterized in that a plurality of grate plates are arranged in the furnace body cavity from top to bottom, which are staggered and overlapped in sequence, the high end of the multi-layer grate plate is connected to the fuel feed port, and the remaining grate plates extend toward the high-temperature flue gas outlet and reduce the height layer by layer, a plurality of air holes are arranged on the grate plate, the multi-layer grate plate is connected to the translation drive mechanism, and the plurality of air holes are connected to the external air supply device through the air supply mechanism. The multi-layer grate plates are connected to each other so that the translation driving mechanism can drive the multi-layer grate plates to move forward and backward, so that the fuel on the multi-layer grate plates can be continuously moved from the fuel feed port to the high-temperature flue gas outlet and evenly spread on each layer of the grate plates. The air supply mechanism can introduce the hot air sent from the outside into the cavity, and then the fuel on the multi-layer grate plates is in a floating state through a plurality of air holes, which has the effect of uniform preheating and complete combustion, not only improving the rapid precipitation of volatile components in biomass fuel, but also improving the combustion efficiency of the fuel and reducing the generation and emission of harmful substances.

[0006] The furnace body is configured as a trapezoidal body with a low front and a high rear, which is surrounded by vertical side panels, an inclined top panel, and a horizontal bottom panel. The shape of the cavity is adapted to the shape of the furnace body. The fuel feed port is arranged at a high position of the rear end side panel of the furnace body, the high-temperature flue gas outlet is arranged at a low position of the front end side panel of the furnace body, and the air supply port is arranged on the top panel of the furnace body. The fuel feed port is connected to an external fuel storage device through a fuel conveying mechanism, the high-temperature flue gas outlet is connected to the decomposition furnace of the cement rotary kiln, and the air supply port is connected to the tertiary air duct of the cement rotary kiln through a pipeline, so as to deliver the heat energy generated by the combustion of biomass fuel into the decomposition furnace of the cement rotary kiln for the decomposition furnace to decompose limestone, so that the decomposition furnace no longer needs to rely on burning fossil fuels to generate heat energy.

[0007] The multi-layer grate plate is arranged in the cavity of the furnace body, and divides the cavity into an upper combustion chamber and a lower equipment chamber. The length and width of the multi-layer grate plate are respectively adapted to the length and width of the cavity. The grate plate located at the highest layer is arranged below the fuel feed port and matched therewith, and the grate plate located at the lowest layer is arranged behind the lower part of the high-temperature flue gas outlet. The front part of the upper grate plate is laid on the rear part of the lower grate plate. Each layer of the grate plate is formed by connecting a plurality of horizontal rectangular plates arranged in parallel in sequence. A plurality of air holes are arranged on the top of the horizontal rectangular plates so that after the fuel enters the furnace body from the feed port, it can be spread flat on the multi-layer grate plate between the fuel feed port and the high-temperature flue gas outlet for preheating and combustion.

[0008] The air holes are configured as rectangular bucket holes with a large upper opening and a small lower opening. A plurality of air holes are evenly or unevenly distributed on the top of the horizontal rectangular plate. An air cavity connected to the plurality of air holes is provided below the horizontal rectangular plate. The air cavity is connected to an air supply mechanism so that the fuel on the grate plate can float under the drive of the airflow through the plurality of air holes provided on the top of the grate plate, thereby enabling the fuel to be evenly preheated and burned.

[0009] The multi-layer grate plate is divided into a fixed grate plate and a movable grate plate. The fixed grate plate and the movable grate plate are arranged alternately from high to low. Both sides of the fixed grate plate are fixed on the corresponding side walls of the furnace body fuel chamber. A fixed component is connected below the fixed grate plate. The movable grate plate is connected to the translation drive mechanism, and both sides of the movable grate plate are connected to the inner wall of the furnace body combustion chamber but not connected, so that the fuel can be pushed from the fuel feed port to the high-temperature flue gas outlet through the cooperation of the fixed grate plate and the movable grate plate, and the fuel can be spread on the corresponding grate plate at the same time.

[0010] The fixing assembly is arranged in the equipment cavity below the multi-layer grate plate, and comprises: a plurality of upper horizontal beams arranged transversely at the bottom of the corresponding fixed grate plate, the two ends of each upper horizontal beam are respectively connected to the upper end of the corresponding column, the lower end of the column is connected to the corresponding longitudinally arranged lower horizontal beam 33, and two lower horizontal beams are provided, which are distributed on both sides of the equipment cavity; the upper horizontal beam at the bottom of the lowest layer of the grate plate located on the high-temperature flue gas outlet side is directly connected to the lower horizontal beam, and the upper horizontal beam at the bottom of the grate plate located on the fuel feed port side and the middle is connected to the lower horizontal beam through the column, so that the fixed grate plate is supported and fixed by the upper horizontal beam, the lower horizontal beam and the fixing assembly composed of the upper horizontal beam, the column and the lower horizontal beam.

[0011] The translation driving mechanism is arranged in the equipment cavity below the multi-layer grate plate, and comprises: a plurality of upper moving beams arranged horizontally at the bottom of the movable grate plate, each of the two ends of the upper moving beam is respectively connected with the upper end of the corresponding connecting column, and the lower end of the connecting column is connected with the corresponding longitudinally arranged lower moving beam, and the lower moving beam is provided with two, and is respectively fixed on the moving vehicle with four moving wheels at the bottom of the equipment cavity, and the four moving wheels are matched with the corresponding rails, and a connecting beam is provided between the two connecting columns at the feeding end, and the connecting beam is connected to the inner end of the pull rod, and the outer end of the pull rod passes through the through hole on the rear end side plate of the furnace body and is hinged to one end of the driving connecting rod, and the other end of the driving connecting rod is hinged to the eccentric shaft arranged on the rotating wheel, and the rotating wheel shaft is connected to the main shaft of the power motor, so that when the power motor drives the rotating wheel to rotate, the rotational motion is converted into linear motion through the eccentric shaft to drive the pull rod to move back and forth, while pulling the lower moving beam and the connecting column thereon to drive the upper moving beam and the movable grate plate to move back and forth, thereby realizing uniform transportation of fuel on the multi-layer grate plate.

[0012] The tops of the multiple upper horizontal beams and the multiple upper movable beams are provided with flat plates, and a plurality of upwardly protruding T-shaped slide rails are arranged at intervals on the flat plates, each T-shaped slide rail is matched with the T-shaped slide groove at the bottom of the corresponding grate plate, and a locking bolt is provided at the outer end of the T-shaped slide groove, and a horizontal connecting plate is provided on the side wall of the upper horizontal beam or the upper movable beam on the same side as the outer end of the T-shaped slide groove, the nut and screw rod at the upper end of the locking bolt are matched with the T-shaped slide groove, and the screw rod at the lower end passes through the screw hole provided on the connecting plate and is screwed with the nut, so that the grate plate can be replaced and repaired when it is damaged.

[0013] The air supply mechanism comprises a first air supply mechanism disposed in the fixed assembly, and a second air supply mechanism disposed in the translation drive mechanism, wherein:

[0014] The first air supply mechanism includes a first air supply cavity provided in the upper horizontal beam, the column and the lower horizontal beam, the first air supply cavities in the upper horizontal beam, the column and the lower horizontal beam are interconnected through the through holes at the connection, the upper horizontal beam is provided with an air supply hole connected to the air cavity in the fixed grate plate, the outer end of one of the lower horizontal beams passes through the through hole on the rear end side plate of the furnace body and is connected to the output end of the external first blower, and the input end of the first blower is connected to the tertiary air duct of the cement rotary kiln through a connecting pipe;

[0015] The second air supply mechanism includes a second air supply cavity provided in the upper moving beam, the connecting column, the lower moving beam, the connecting beam and the pull rod, the second air supply cavities in the upper moving beam, the connecting column, the lower moving beam, the connecting beam and the pull rod are interconnected through through holes at the connection, the upper moving beam is provided with an air supply hole connected to the air cavity in the moving grate plate, an air inlet hole is provided on the side wall of the outer end of the pull rod, the air inlet hole is connected to the output end of the second blower through a hose, and the input end of the second blower is connected to the tertiary air duct of the cement rotary kiln through a connecting pipe;

[0016] By supplying tertiary air into the air chambers of the fixed grate plate and the movable grate plate, the airflow ejected from the air holes on the grate plate can continuously float the fuel, which can effectively improve the uniformity of fuel preheating and fuel combustion and promote complete combustion of the fuel.

[0017] A conventional ignition mechanism and a conventional high-temperature monitoring probe are provided in the combustion chamber. The ignition mechanism is provided at the bottom of the inclined top plate of the furnace body. The high-temperature probe is connected to a power cylinder provided on the vertical side plate at the rear end of the furnace body. The front end of the power cylinder seat is connected to the outer wall of the vertical side plate. The end of the piston rod passes through a through hole provided on the vertical side plate and is connected to the high-temperature probe in the combustion chamber. The high-temperature probe is electrically connected to an external monitoring device so that the fuel in the combustion chamber can be ignited by the ignition mechanism. The preheating and combustion process can be monitored by the high-temperature probe.

[0018] A vertically arranged control door is provided in the high-temperature flue gas outlet, and the control door is matched with the long strip through hole provided at the top of the high-temperature flue gas outlet. Vertical slide grooves matched with the vertical edges on both sides of the control door are provided on the inner walls on both sides of the high-temperature flue gas outlet. A door-type frame is provided above the top of the high-temperature flue gas outlet, and a winch is provided on the door-type frame. The end of the steel cable wound on the winch passes through the long strip through hole and is connected to the top of the control door, so that after the steel cable is wound or released by the winch, the control door is driven to rise or fall, thereby controlling the amount of high-temperature flue gas entering the decomposition furnace of the cement rotary kiln.

[0019] The utility model has the following advantages and effects: adopting the above scheme, the multi-layer grate plate is driven to move forward and backward through the translation drive mechanism, so that the fuel on the multi-layer grate plate can be continuously moved from the fuel feed port to the high-temperature smoke outlet and evenly spread on each layer of the grate plate. The hot air sent by the external air supply device can be introduced into the cavity through a plurality of air holes, so that the fuel can be continuously floated in the furnace body, achieving the effect of uniform preheating and uniform combustion, which not only improves the rapid precipitation of volatile components in biomass fuel, but also improves the combustion efficiency of the fuel and reduces the generation and emission of harmful substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front cross-sectional view of the utility model;

[0021] Figure 2 It is a right side cross-sectional view of the utility model;

[0022] Figure 3 It is a top view of the utility model;

[0023] Figure 4 This is a top view of the grate plate of the utility model;

[0024] Figure 5 This is a cross-sectional view of the grate plate of the utility model;

[0025] Figure 6 This is a rear view of the fixed grate plate of the utility model;

[0026] Figure 7 It is a rear view of the movable grate plate of the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0028] The grate type combustion furnace provided by the utility model comprises a furnace body 1, a cavity is arranged in the furnace body 1, an ignition mechanism is arranged in the cavity, an air supply port 12 is arranged at the top of the furnace body 1, a fuel feed port 13 is arranged at the right end, and a high-temperature flue gas outlet 3 is arranged at the left end, and multiple layers of grate plates 4 are arranged in the cavity of the furnace body 1 from top to bottom, which are staggered and overlapped in sequence, the high end of the multiple layers of grate plates 4 is connected to the fuel feed port 13, and the remaining grate plates extend toward the high-temperature flue gas outlet 3 and reduce the height layer by layer, and a plurality of air holes 5 are arranged on the grate plates, the multiple layers of grate plates 4 are connected to the translation driving mechanism, and the plurality of air holes 5 are connected to the external air supply equipment through the air supply mechanism, such as Figure 1 , Figure 2 , so that the multi-layer grate plate 4 can be driven to move forward and backward through the translation drive mechanism, so that the fuel on the multi-layer grate plate 4 can be continuously moved from the fuel feed port 13 to the high-temperature flue gas outlet 3 and evenly spread on each layer of the grate plate, and the hot air sent from the outside can be introduced into the cavity through the air supply mechanism, and then the fuel on the multi-layer grate plate 4 is formed into a floating state through a plurality of air holes 5, which has the effect of uniform preheating and complete combustion, not only improving the rapid precipitation of volatile components in the biomass fuel, but also improving the combustion efficiency of the fuel, and reducing the generation and emission of harmful substances;

[0029] The furnace body 1 is configured as a trapezoidal body with a low front and a high rear, which is surrounded by vertical side panels, an inclined top panel, and a horizontal bottom panel. The shape of the cavity is adapted to the shape of the furnace body. The fuel feed port 13 is provided at a high position of the rear end side panel of the furnace body 1, the high-temperature flue gas outlet 3 is provided at a low position of the front end side panel of the furnace body 1, and the air supply port 12 is provided on the top panel of the furnace body 1. The fuel feed port 13 is connected to an external fuel storage device through a fuel delivery mechanism, the high-temperature flue gas outlet 3 is connected to the decomposition furnace of the cement rotary kiln, and the air supply port 12 is connected to the tertiary air duct of the cement rotary kiln through a pipeline, such as Figure 1 , so that the heat energy generated by the combustion of biomass fuel can be sent to the decomposition furnace of the cement rotary kiln for the decomposition furnace to decompose limestone, so that the decomposition furnace does not need to rely on fossil fuels to generate heat energy;

[0030] The multi-layer grate plate 4 is arranged in the cavity of the furnace body 1, and divides the cavity into an upper combustion chamber 6 and a lower equipment chamber 2. The length and width of the multi-layer grate plate 4 are respectively adapted to the length and width of the cavity. The grate plate at the highest layer is arranged below the fuel feed port 13 and matched therewith, and the grate plate at the lowest layer is arranged behind the lower part of the high-temperature flue gas outlet 3. The front part of the upper grate plate is laid on the rear part of the lower grate plate. Each layer of the grate plate is formed by connecting a plurality of horizontal rectangular plates 36 arranged in parallel in sequence. The top of the horizontal rectangular plate 36 is provided with a plurality of air holes 5, such as Figure 1 , Figure 4 , so that after the fuel enters the furnace body 1 from the feed port 13, it can be spread on the multi-layer grate plate 4 between the fuel feed port 13 and the high-temperature flue gas outlet 3 to complete preheating and combustion;

[0031] The air holes 5 are configured as rectangular bucket holes with a large upper opening and a small lower opening. A plurality of air holes 5 are evenly distributed on the top of the horizontal rectangular plate 36. An air cavity 14 connected to the plurality of air holes 5 is provided below the horizontal rectangular plate 36. The air cavity 14 is connected to an air supply mechanism so that the fuel on the grate plate can float under the drive of the air flow through the air cavity 14 provided below the grate plate and the plurality of air holes 5 on the grate plate, thereby enabling the fuel to be evenly preheated and burned. Figure 4 , Figure 5 ;

[0032] The multi-layer grate plate 4 is divided into a fixed grate plate 32 and a movable grate plate 29, and the fixed grate plate 32 and the movable grate plate 29 are alternately arranged from high to low, and the fixed grate plate 32 is fixed on the corresponding side walls of the combustion chamber 6 of the furnace body 1 at both sides, and a fixed component is connected below the fixed grate plate 32, and the movable grate plate 29 is connected to the translation drive mechanism, and the two sides of the movable grate plate 29 are connected to the inner wall of the combustion chamber 6 of the furnace body 1 but not connected, so that the fixed grate plate 32 and the movable grate plate 29 cooperate to push the fuel from the fuel feed port 13 to the high-temperature flue gas outlet 3, and at the same time, the fuel is flattened on the corresponding grate plate;

[0033] The fixed assembly is arranged in the equipment chamber 2 below the multi-layer grate plate 4, and includes: a plurality of upper horizontal beams 30 arranged transversely at the bottom of the corresponding fixed grate plate 32, each upper horizontal beam 30 having two ends connected to the upper end of the corresponding column 31, and the lower end of the column 31 is connected to the corresponding lower horizontal beam 33 arranged longitudinally, such as Figure 1 That is, two lower horizontal beams 33 are also provided, which are distributed on both sides of the equipment cavity 2. The upper horizontal beam 30 at the bottom of the lowest grate plate on the side of the high-temperature flue gas outlet 3 is directly connected to the lower horizontal beam 33, and the upper horizontal beam 30 at the bottom of the grate plate on the side of the fuel feed port 13 and the middle is connected to the lower horizontal beam 33 through the column 31, so that the fixed grate plate 32 is supported and fixed by the upper horizontal beam 30, the lower horizontal beam 33 and the fixing assembly composed of the upper horizontal beam 30, the column 31 and the lower horizontal beam 33;

[0034] The translation drive mechanism is arranged in the equipment chamber 2 below the multi-layer grate plate 4, and includes: a plurality of upper moving beams 27 arranged transversely at the bottom of the movable grate plate 29, each upper moving beam 27 has two ends connected to the upper end of the corresponding connecting column 28, and the lower end of the connecting column 28 is connected to the corresponding longitudinally arranged lower moving beam 26, and the lower moving beam 26 is provided with two pieces, which are respectively fixed on a moving vehicle with four moving wheels 25 at the bottom of the equipment chamber 2, and the four moving wheels 25 are matched with the corresponding tracks 24, and a connecting beam 34 is provided between the two connecting columns 28 at the feeding end, and the connecting beam 34 is connected to the pull rod 18 The inner ends of the pull rod 18 are connected, and the outer end of the pull rod 18 passes through the through hole on the rear end side plate of the furnace body 1 and is hinged to one end of the driving connecting rod 20. The other end of the driving connecting rod 20 is hinged to the eccentric shaft arranged on the runner 21. The runner 21 shaft is connected to the main shaft of the power motor 22, so that when the power motor 22 drives the runner 21 to rotate, the eccentric shaft converts the rotational motion into linear motion to drive the pull rod 18 to move back and forth, while pulling the lower moving beam 26 and the connecting column 28 thereon to drive the upper moving beam 27 and the movable grate plate 29 to move back and forth, thereby realizing the uniform transportation of fuel on the multi-layer grate plate 4, such as Figure 1 , Figure 2 ;

[0035] A flat plate 38 is provided on the top of the multiple upper horizontal beams 30 and the multiple upper movable beams 27, and a plurality of T-shaped slide rails 37 protruding upward are provided on the flat plate 38 at intervals, and each T-shaped slide rail 37 is matched with a T-shaped slide groove 39 at the bottom of the corresponding grate plate, and a locking bolt 40 is provided at the outer end of the T-shaped slide groove 39. A horizontal connecting plate 41 is provided on the side wall of the upper horizontal beam 30 or the upper movable beam 27 on the same side as the outer end of the T-shaped slide groove 39. The nut and screw at the upper end of the locking bolt 40 are matched with the T-shaped slide groove 39, and the screw at the lower end passes through the screw hole provided on the connecting plate 41 and is screwed with the nut, so that the grate plate can be replaced and repaired when it is damaged, such as Figure 6 , Figure 7 ;

[0036] The air supply mechanism comprises a first air supply mechanism disposed in the fixed assembly, and a second air supply mechanism disposed in the translation drive mechanism, wherein:

[0037] The first air supply mechanism includes a first air supply cavity 17 disposed in the upper horizontal beam 30, the column 31 and the lower horizontal beam 33. The first air supply cavity 17 in the upper horizontal beam 30, the column 31 and the lower horizontal beam 33 is connected to each other through a through hole 16 at the connection. The upper horizontal beam 30 is provided with an air supply hole 15 connected to the air cavity 14 in the fixed grate plate 32. Figure 6 , the outer end of one of the lower horizontal beams 33 passes through the through hole on the rear end side plate of the furnace body 1 and is connected to the output end of the external first blower 23, and the input end of the first blower 23 is connected to the tertiary air duct of the cement rotary kiln through a connecting pipe;

[0038] The second air supply mechanism includes a second air supply cavity provided in the upper moving beam 27, the connecting column 28, the lower moving beam 26, the connecting beam 34 and the pull rod 18. The second air supply cavities in the upper moving beam 27, the connecting column 28, the lower moving beam 26, the connecting beam 34 and the pull rod 18 are interconnected through the through holes at the connection. The upper moving beam 27 is provided with an air supply hole connected to the air cavity 14 in the moving grate plate 29. The outer end side wall of the pull rod 18 is provided with an air inlet hole 19, which is connected to the output end of the second blower through a hose 35. The input end of the second blower is connected to the tertiary air duct of the cement rotary kiln through a connecting pipe.

[0039] By supplying tertiary air into the air chamber 14 of the fixed grate plate 32 and the movable grate plate 29, the airflow ejected from the air holes 5 on the grate plate can continuously float the fuel, which can effectively improve the uniformity of fuel preheating and fuel combustion, and promote complete combustion of the fuel;

[0040] A conventional ignition mechanism and a conventional high-temperature monitoring probe are provided in the combustion chamber 6. The ignition mechanism is provided at the bottom of the inclined top plate of the furnace body 1. The high-temperature probe is connected to a power cylinder provided on a vertical side plate at the rear end of the furnace body 1. The front end of the power cylinder seat is connected to the outer wall of the vertical side plate. The end of the piston rod passes through a through hole provided on the vertical side plate and is connected to the high-temperature probe in the combustion chamber 6. The high-temperature probe is electrically connected to an external monitoring device so that the fuel in the combustion chamber can be ignited by the ignition mechanism. The preheating and combustion process can be monitored by the high-temperature probe.

[0041] A vertical control door 7 is provided in the high-temperature flue gas outlet 3, and the control door 7 is matched with the long strip through hole provided at the top of the high-temperature flue gas outlet 3. Vertical slide grooves 8 matched with the vertical edges on both sides of the control door 7 are provided on the inner walls on both sides of the high-temperature flue gas outlet 3. A door-type frame 9 is provided above the top of the high-temperature flue gas outlet 3, and a winch 11 is provided on the door-type frame 9. The end of the steel cable 10 wound on the winch 11 passes through the long strip through hole and is connected to the top of the control door 7, so that after the steel cable 10 is wound or released by the winch 11, the control door 7 is driven to rise or fall, thereby controlling the amount of high-temperature flue gas entering the decomposition furnace of the cement rotary kiln.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A grate combustion furnace, comprising a furnace body, a cavity is arranged in the furnace body, an ignition mechanism is arranged in the cavity, an air supply port, a fuel feed port, and a high-temperature flue gas outlet are arranged on the furnace body, characterized in that A plurality of layers of grate plates are arranged in sequence from top to bottom in the furnace cavity, the high ends of the multi-layer grate plates are connected to the fuel feed port, the remaining grate plates extend toward the high-temperature flue gas outlet and decrease in height layer by layer, a plurality of air holes are arranged on the grate plates, the multi-layer grate plates are connected to the translation drive mechanism, and a plurality of air holes are connected to the external air supply equipment through the air supply mechanism.

2. The grate combustion furnace according to claim 1, characterized in that The furnace body is configured as a trapezoidal body with a low front and a high rear, which is surrounded by vertical side panels, an inclined top panel, and a horizontal bottom panel. The shape of the cavity is adapted to the shape of the furnace body. The fuel feed port is arranged at a high position on the rear end side panel of the furnace body, the high-temperature flue gas outlet is arranged at a low position on the front end side panel of the furnace body, and the air supply port is arranged on the top panel of the furnace body, wherein the fuel feed port is connected to an external fuel storage device through a fuel conveying mechanism, the high-temperature flue gas outlet is connected to a decomposition furnace of a cement rotary kiln, and the air supply port is connected to a tertiary air duct of the cement rotary kiln through a pipeline.

3. The grate combustion furnace according to claim 1, characterized in that The multi-layer grate plate is arranged in the cavity of the furnace body, and divides the cavity into an upper combustion chamber and a lower equipment chamber. The length and width of the multi-layer grate plate are respectively adapted to the length and width of the cavity. The grate plate located at the highest layer is arranged below the fuel feed port and matched therewith, and the grate plate located at the lowest layer is arranged behind the lower part of the high-temperature flue gas outlet. The front part of the upper grate plate is laid on the rear part of the lower grate plate. Each layer of the grate plate is formed by connecting a plurality of horizontal rectangular plates arranged in parallel in sequence, and a plurality of air holes are arranged on the top of the horizontal rectangular plates.

4. The grate combustion furnace according to claim 3, characterized in that The air holes are configured as rectangular bucket holes with a large upper opening and a small lower opening. A plurality of air holes are evenly or unevenly distributed on the top of the horizontal rectangular plate. An air cavity connected to the plurality of air holes is provided below the horizontal rectangular plate, and the air cavity is connected to the air supply mechanism.

5. The grate combustion furnace according to claim 1, characterized in that The multi-layer grate plates are divided into fixed grate plates and movable grate plates. The fixed grate plates and the movable grate plates are arranged alternately from high to low. Both sides of the fixed grate plates are fixed on the corresponding side walls of the furnace body fuel chamber. A fixed component is connected below the fixed grate plates. The movable grate plates are connected to the translation drive mechanism, and both sides of the movable grate plates are connected to the inner wall of the furnace body combustion chamber but are not connected.

6. The grate combustion furnace according to claim 5, characterized in that The fixed component is arranged in the equipment cavity below the multi-layer grate plate, and includes: a plurality of upper horizontal beams arranged transversely at the bottom of the corresponding fixed grate plate, the two ends of each upper horizontal beam are respectively connected to the upper end of the corresponding column, the lower end of the column is connected to the corresponding longitudinally arranged lower horizontal beam, and two lower horizontal beams are provided, which are distributed on both sides of the equipment cavity; the upper horizontal beam at the bottom of the lowest layer of the grate plate located on the high-temperature flue gas outlet side is directly connected to the lower horizontal beam, and the upper horizontal beam at the bottom of the grate plate located on the fuel feed port side and the middle is connected to the lower horizontal beam through the column.

7. The grate combustion furnace according to claim 5, characterized in that The translation driving mechanism is arranged in the equipment cavity below the multi-layer grate plate, and comprises: a plurality of upper movable beams arranged transversely at the bottom of the movable grate plate, the two ends of each upper movable beam are respectively connected with the upper end of the corresponding connecting column, the lower end of the connecting column is connected with the corresponding longitudinally arranged lower movable beam, two lower movable beams are provided, which are respectively fixed on a moving vehicle with four moving wheels at the bottom of the equipment cavity, the four moving wheels are matched with the corresponding tracks, a connecting beam is provided between the two connecting columns at the feed end, the connecting beam is connected to the inner end of the pull rod, the outer end of the pull rod passes through the through hole on the rear end side plate of the furnace body and is hinged to one end of the driving connecting rod, the other end of the driving connecting rod is hinged to the eccentric shaft arranged on the rotating wheel, and the rotating wheel shaft is connected to the main shaft of the power motor.

8. The grate combustion furnace according to claim 6, characterized in that The tops of the multiple upper horizontal beams and the multiple upper movable beams are provided with flat plates, and the flat plates are provided with multiple T-shaped slide rails protruding upward at intervals, each T-shaped slide rail is matched with the T-shaped slide groove at the bottom of the corresponding grate plate, and a locking bolt is provided at the outer end of the T-shaped slide groove. A horizontal connecting plate is provided on the side wall of the upper horizontal beam or the upper movable beam on the same side as the outer end of the T-shaped slide groove, the nut and screw rod at the upper end of the locking bolt are matched with the T-shaped slide groove, and the screw rod at the lower end passes through the screw hole provided on the connecting plate and is screwed with the nut.

9. The grate combustion furnace according to claim 1, characterized in that The air supply mechanism comprises a first air supply mechanism disposed in the fixed connection assembly, and a second air supply mechanism disposed in the translation drive mechanism, wherein: The first air supply mechanism includes a first air supply cavity provided in the upper horizontal beam, the column and the lower horizontal beam, the first air supply cavities in the upper horizontal beam, the column and the lower horizontal beam are interconnected through the through holes at the connection, the upper horizontal beam is provided with an air supply hole connected to the air cavity in the fixed grate plate, the outer end of one of the lower horizontal beams passes through the through hole on the rear end side plate of the furnace body and is connected to the output end of the external first blower, and the input end of the first blower is connected to the tertiary air duct of the cement rotary kiln through a connecting pipe; The second air supply mechanism includes a second air supply chamber arranged in the upper moving beam, the connecting column, the lower moving beam, the connecting beam and the pull rod. The second air supply chambers in the upper moving beam, the connecting column, the lower moving beam, the connecting beam and the pull rod are interconnected through through holes at the connecting parts. The upper moving beam is provided with an air supply hole connected to the wind chamber in the moving grate plate. An air inlet hole is opened on the side wall of the outer end of the pull rod. The air inlet hole is connected to the output end of the second blower through a hose. The input end of the second blower is connected to the tertiary air duct of the cement rotary kiln through a connecting pipe.

10. The grate combustion furnace according to claim 1, characterized in that A vertically arranged control door is provided in the high-temperature smoke outlet, and the control door is matched with the long strip through hole provided at the top of the high-temperature smoke outlet. Vertical slide grooves matching the vertical edges on both sides of the control door are provided on the inner walls on both sides of the high-temperature smoke outlet. A door-type frame is provided above the top of the high-temperature smoke outlet, and a winch is provided on the door-type frame. The end of the steel cable wound on the winch passes through the long strip through hole and is connected to the top of the control door.

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