A membrane wall-mounted DZL type biomass boiler body

Abstract

This invention discloses a membrane wall-type DZL biomass boiler body, relating to the field of biomass boiler technology. In this invention, a chain grate is rotatably installed inside the grate feeding box. Several limiting push plates are arrayed on the surface of the chain grate. A flue gas preheating zone, a primary combustion zone, a secondary combustion zone, and an ash removal zone are respectively arranged between the grate feeding box and the chain grate. An inclined conveying channel for feeding the flue gas preheating zone is provided at the front of the membrane wall furnace. The flue gas preheating zone is connected to the flue gas duct via a flue gas guide pipe. Flue gas enters the flue gas preheating zone through the flue gas guide pipe to preheat the biomass pellets. After preheating, the flue gas flows back into the membrane wall furnace for water heat exchange. This invention, by setting membrane walls on the left and right sides of the furnace, significantly increases the boiler's heat exchange area, reduces the furnace temperature, solves the coking problem, reduces the generation of thermal nitrogen oxides, and improves the boiler's sealing performance, reduces the air leakage coefficient, and increases the boiler's thermal efficiency.

Description

Technical Field

[0001] This invention belongs to the field of biomass boiler technology, and in particular relates to a membrane wall-mounted DZL type biomass boiler body. Background Technology

[0002] A membrane wall is a continuous and airtight furnace wall structure made of multiple parallel boiler steel pipes (water pipes) welded together with steel plates. Its interior contains flowing water and steam, while its exterior directly withstands the high-temperature radiation of the flame for heat exchange. Biomass energy is a renewable energy source with zero carbon emissions in an ecological sense, and its combustion products are relatively clean.

[0003] The existing DZL-type biomass boilers are basically traditional heavy-duty coal-fired boilers that are used directly. However, they have the following shortcomings in use:

[0004] (1) The rear arch is constructed by firing special-shaped bricks or refractory concrete. If the firing special-shaped bricks are used, the firing period is longer. If the refractory concrete is used, the amount of work and labor intensity are greater. Both of these forms will also form an insulated furnace, which has a higher furnace temperature, leading to easy coking and higher NOx emissions.

[0005] (2) The side walls of the furnace and the wing-shaped flue are covered with fired special-shaped bricks to form a flue gas passage. The rear side of the furnace is sealed with refractory bricks. If the firing special-shaped bricks are used, the firing period is longer. If the refractory bricks are used, the amount of work and labor intensity are greater. The air leakage coefficient of the brick wall is large, and the boiler thermal efficiency is reduced.

[0006] (3) The chain grate directly transports biomass to a separate combustion zone. During the combustion time set by the system, the biomass inside the biomass pile may undergo incomplete combustion, which can easily be transported to the ash removal zone when the chain grate is running, thus causing a waste of biomass energy. Summary of the Invention

[0007] The purpose of this invention is to provide a membrane wall-mounted DZL type biomass boiler body. Through the specific structural design of the membrane fireplace and grate feeding mechanism, it solves the problems of existing DZL type biomass boilers during use, such as high furnace temperature leading to easy coking, high NOx emissions, large air leakage coefficient of brick walls, reduced boiler thermal efficiency, and the easy discharge of incompletely burned biomass into the ash discharge area, thus causing waste of biomass energy.

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: The present invention is a membrane wall-mounted DZL type biomass boiler body, including a membrane fireplace and a grate feeding mechanism. The membrane fireplace includes a furnace and a flue that are interconnected. The grate feeding mechanism is used to convey biomass pellets into the furnace. The grate feeding mechanism includes a grate feeding box disposed inside the furnace. A chain grate is rotatably installed inside the grate feeding box. Several limiting push plates are arrayed on the surface of the chain grate. A flue is disposed between the grate feeding box and the chain grate. The furnace comprises a gas preheating zone, a primary combustion zone, a secondary combustion zone, and an ash removal zone, arranged sequentially along the running direction of the chain grate. The grate feeding box has ventilation holes communicating with the secondary combustion zone. A sloping conveying channel for feeding material to the gas preheating zone is provided on the front side of the membrane fireplace. The gas preheating zone is connected to the flue gas duct via a flue gas guide pipe. The flue gas in the flue gas duct enters the gas preheating zone through the flue gas guide pipe to preheat the biomass pellets. After preheating, the flue gas flows back into the membrane fireplace for water heat exchange.

[0009] In this embodiment of the invention, the membrane fireplace further includes a pot shell cylinder, a water inlet is installed at the top of the pot shell cylinder, a partition plate is fixed on the inner wall of the pot shell cylinder near the front side, a pot cylinder rear shell is installed on the rear side of the pot shell cylinder, a flue gas guiding cavity is provided on the front side of the pot shell cylinder, and a plurality of flue gas heat exchange pipes are provided on the inner side of the pot shell cylinder. The flue gas heat exchange pipes are fixedly installed between the pot cylinder rear shell and the partition plate. The front end of the flue gas heat exchange pipes is connected to the flue gas guiding cavity, and the rear end of the flue gas heat exchange pipes is connected to the external environment of the pot shell cylinder.

[0010] In this embodiment of the invention, two membrane walls are symmetrically fixedly installed at the bottom of the boiler shell cylinder. A furnace front wall is installed on the front side of the membrane wall, and a combustion chamber rear wall is installed on the rear side of the membrane wall. A furnace rear wall located between the two membrane walls is installed at the bottom of the boiler shell cylinder. The furnace is located on one side of the furnace rear wall, and a combustion chamber is located on the other side of the furnace rear wall. The furnace and the combustion chamber are connected through a flue gas outlet. Each wall tube on the membrane wall is connected to the inner cavity of the boiler shell cylinder.

[0011] In this embodiment of the invention, two wing-shaped walls with membrane wall structures are symmetrically arranged inside the furnace. Each wall tube on the wing-shaped wall is connected to the inner cavity of the boiler shell. The wing-shaped wall is fixedly installed between the boiler shell and the membrane wall. The rear side of the wing-shaped wall is close to the rear wall of the combustion chamber and there is a flue gas gap between them. The flue gas gap is used to communicate with the flues on both sides. The rear wall of the furnace is fixedly connected to the two wing-shaped walls at its top. The flue gas is composed of the boiler shell, the wing-shaped wall and the membrane wall.

[0012] In this embodiment of the invention, a water collection pipe is fixedly installed at the bottom of the membrane wall, and each wall pipe on the membrane wall is connected to the water collection pipe. The wall pipe on the wing-shaped wall is connected to the corresponding wall pipe on the membrane wall. An external water pipe is fixedly installed at the bottom of the water collection pipe, and a control valve is fixedly installed on the external water pipe. An installation port and an installation hole are respectively opened on the front wall surface of the furnace. The grate feeding box is sealed inside the installation port, and the flue is sealed inside the installation hole. The installation port is connected to the furnace, and the installation hole corresponds one-to-one with the flue and the two are connected. An ash collection box is fixedly installed at the bottom of the membrane fireplace, and the ash collection box is connected to the furnace through an ash discharge port.

[0013] In this embodiment of the invention, the top of the grate feeding box is provided with a combustion port corresponding to the position of the primary combustion zone, and the bottom of the grate feeding box is provided with an ash discharge port corresponding to the position of the ash discharge zone and communicating with the ash collection box. The inclined conveying channel is fixedly installed on the front side of the grate feeding box. The inclined conveying channel is connected to the flue gas preheating zone through a feeding port. The top of the grate feeding box is fixedly installed with a guide channel located outside the membrane fireplace. The guide channel is connected to the inclined conveying channel through a dropping port. A sealed docking ring communicating with its inner cavity is fixedly installed on one side of the guide channel. The sealed docking ring is sealed and inserted into the boiler shell cylinder, and the sealed docking ring is connected to the flue gas guide cavity.

[0014] In this embodiment of the invention, a vertical guide rod is fixedly installed on the inner wall of the sealed docking ring, and a biomass conveying box sleeved on the vertical guide rod is slidably arranged inside the guide channel. A heat insulation frame is installed on the top of the sealed docking ring, and the output end of the lifting cylinder installed on the top of the heat insulation frame is connected to the biomass conveying box. A feeding motor for driving the chain grate rotation is installed on the outside of the membrane fireplace. An upper feed port and a lower discharge port are opened on the side of the biomass conveying box away from the vertical guide rod. The bottom of the biomass conveying box is a downwardly extending arc structure, and the lower discharge port is set close to the bottom of the biomass conveying box.

[0015] In this embodiment of the invention, a biomass storage box is installed on one side of the guide channel relative to the sealed docking ring. An inclined guide seat is fixedly installed inside the biomass storage box. An inclined guide channel is provided below the inclined guide seat. An upper discharge port communicating with the inclined guide channel is opened on the side of the guide channel near the biomass storage box. A limiting slide is opened on the surface of the guide channel communicating with the upper discharge port. A support plate that passes through the limiting slide and is fixed to the biomass conveying box is provided inside the biomass storage box. An inclined sealing seat that cooperates with the inclined guide seat is fixed on the top of the support plate.

[0016] The present invention has the following beneficial effects: 1. By setting membrane walls on the left and right sides of the furnace, the water in the boiler shell is filled into each tube of the membrane wall. During the combustion of biomass in the furnace, the water in the tubes is heated by the thermal radiation of the membrane wall. Due to the special structural design of the membrane wall, the heating area of ​​the membrane wall is greatly increased, which greatly improves the heat exchange effect of the water in the membrane wall. At the same time, the furnace temperature is reduced, the coking problem is solved, the generation of thermal nitrogen oxides is reduced, the membrane wall increases the sealing performance of the boiler, reduces the air leakage coefficient, and improves the thermal efficiency of the boiler.

[0017] 2. In this invention, when biomass fuel is transported to the primary combustion zone for combustion, the heat radiation and hot flue gas generated by combustion are used to heat the water in the boiler. During the combustion process, a certain amount of biomass is transported to the flue gas preheating zone again, and the flue gas flowing through the flue gas preheating zone is used to preheat the biomass, thereby improving the combustion efficiency of biomass fuel.

[0018] 3. This invention controls the chain grate to rotate clockwise by a certain angle, so that the biomass in the flue gas preheating zone is transported to the primary combustion zone for combustion. Then, the sealing plate is lowered by the sealing cylinder to complete the reset. At this time, the biomass raw material originally in the primary combustion zone (having completed primary combustion) is transported to the secondary combustion zone. The biomass raw material that has completed primary combustion is turned over in the secondary combustion zone. This allows the unburned biomass that may exist inside the biomass pile to be exposed and continue to burn, thereby greatly improving the combustion efficiency of biomass and effectively avoiding the waste of biomass energy caused by incomplete combustion. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the membrane wall-mounted DZL type biomass boiler body in this invention.

[0021] Figure 2 This is a diagram showing the working state of the membrane wall-mounted DZL type biomass boiler body in this invention.

[0022] Figure 3 This is a schematic diagram of the membrane fireplace in this invention.

[0023] Figure 4 for Figure 3 A structural diagram viewed from below.

[0024] Figure 5 This is a longitudinal structural cross-sectional view of the membrane fireplace in this invention.

[0025] Figure 6 This is a longitudinal structural cross-sectional view of the membrane fireplace in this invention.

[0026] Figure 7 This is a schematic diagram of the grate feeding mechanism in this invention.

[0027] Figure 8 for Figure 7 A structural diagram viewed from below.

[0028] Figure 9 This is a cross-sectional view of the grate feeding mechanism in this invention.

[0029] Figure 10 for Figure 9 Enlarged view of the local structure at point A in the middle.

[0030] Figure 11 for Figure 9 The front view of the structure.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1-Membrane fireplace, 101-Furnace chamber, 102-Flue, 103-Potshell, 104-Water inlet, 105-Divider plate, 106-Potshell rear shell, 107-Flue gas guide cavity, 108-Flue gas heat exchange pipe, 109-Membrane wall, 110-Furnace front wall, 111-Combustion chamber rear wall, 112-Furnace rear wall, 113-Combustion chamber, 114-Flue gas outlet, 115-Airfoil wall, 116-Exhaust gas gap, 117-Water collection pipe, 118-External water pipe, 119-Control valve, 120-Installation port, 121-Installation hole, 122-Ash collection box, 123-Ash discharge port one, 2-Grate feeding mechanism, 201-Grate feeding box, 202 - Chain grate, 203 Limiting push plate, 204 Vent hole, 205 Inclined conveying channel, 206 Smoke guide pipe, 207 Combustion port, 208 Ash discharge port II, 209 Feed port, 210 Guide channel, 211 Lower discharge port, 212 Sealed docking ring, 213 Vertical guide rod, 214 Biomass conveying box, 215 Heat insulation frame, 216 Lifting cylinder, 217 Feeding motor, 218 Upper feed port, 219 Lower discharge port, 220 Biomass storage box, 221 Inclined guide seat, 222 Inclined guide channel, 223 Upper discharge port, 224 Limiting slide, 225 Support plate, 226 Inclined sealing seat. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] For a specific implementation example, please refer to Implementation Example 1. Figures 1-11 The present invention is a membrane wall-mounted DZL type biomass boiler body, including a membrane fireplace 1 and a grate feeding mechanism 2 (the membrane fireplace 1 and the grate feeding mechanism 2 are installed on an external frame to form a support). The membrane fireplace 1 includes a furnace 101 and a flue 102 that are interconnected. The grate feeding mechanism 2 is used to transport biomass pellets into the furnace 101. The flue gas generated by biomass combustion enters each flue 102 from the furnace 101.

[0035] The grate feeding mechanism 2 includes a grate feeding box 201 disposed inside the furnace chamber 101. A chain grate 202 (existing technology) is rotatably mounted inside the grate feeding box 201. Several limiting push plates 203 are arrayed on the surface of the chain grate 202 (the spacing between each limiting push plate 203 is consistent, and the operation of the chain grate 202 can drive the synchronous movement of each limiting push plate 203). A flue gas preheating zone, a primary combustion zone, a secondary combustion zone, and an ash removal zone are respectively disposed between the grate feeding box 201 and the chain grate 202. The flue gas preheating zone, primary combustion zone, secondary combustion zone, and ash removal zone are arranged sequentially along the running direction of the chain grate 202. A vent 204 communicating with the secondary combustion zone is provided on the grate feeding box 201 (e.g., ...). Figure 11 (As shown).

[0036] The membrane fireplace 1 has an inclined conveying channel 205 on the front side for feeding the flue gas preheating zone. The flue gas preheating zone and the flue 102 are connected by a flue pipe 206. Biomass is burned in the primary combustion zone (the combustion time is set by the system). The generated flue gas enters each flue 102 from the furnace 101. The flue gas in the flue 102 enters the flue gas preheating zone through the flue pipe 206 to preheat the biomass pellets. After preheating, the flue gas flows back into the membrane fireplace 1 for water heat exchange.

[0037] In this embodiment of the invention, such as Figure 3 and Figure 6As shown, the membrane fireplace 1 also includes a boiler shell 103, with a water inlet 104 installed at the top of the boiler shell 103. A partition plate 105 is fixed to the inner wall of the boiler shell 103 near the front side. A boiler shell rear shell 106 is installed at the rear side of the boiler shell 103. A flue gas guiding cavity 107 is provided at the front side of the boiler shell 103 (the partition plate 105 divides the inner cavity of the boiler shell 103 into a flue gas guiding cavity 107 and a water storage cavity). Several flue gas heat exchange pipes 108 are provided inside the boiler shell 103, and the flue gas heat exchange pipes 108 are fixedly installed on the boiler shell rear shell. Between 106 and the partition plate 105, the front end of the flue gas heat exchange pipe 108 is connected to the flue gas guide cavity 107, and the rear end of the flue gas heat exchange pipe 108 is connected to the external environment of the boiler shell 103. The flue gas in the flue duct 102 enters the flue gas preheating zone through the flue gas guide pipe 206 to preheat the biomass pellets therein. After the flue gas is preheated, it enters the flue gas guide cavity 107 through the inclined conveying channel 205. The flue gas then passes through each flue gas heat exchange pipe 108 to achieve heat exchange. In this way, the water in the boiler shell 103 is heated by the waste heat of the flue gas.

[0038] In this embodiment of the invention, such as Figures 3 to 5 As shown, two membrane walls 109 are symmetrically fixedly installed at the bottom of the boiler shell 103. A furnace front wall 110 is installed on the front side of the membrane wall 109, and a combustion chamber rear wall 111 is installed on the rear side of the membrane wall 109. A furnace rear wall 112 is installed at the bottom of the boiler shell 103 between the two membrane walls 109. The furnace 101 is located on one side of the furnace rear wall 112, and a combustion chamber 113 is located on the other side of the furnace rear wall 112. The furnace 101 and the combustion chamber 113 are connected through a flue gas outlet 114. Each wall tube on the membrane wall 109 is connected to the inner cavity of the boiler shell 103. The combustion chamber 111 is connected to the furnace 101 by means of flue gas outlet 114. The membrane wall 109 allows water inside the boiler shell 103 to fill all the tubes on the membrane wall 109. During the combustion of biomass inside the furnace 101, the water inside the tubes undergoes large-area heat exchange through thermal radiation from the membrane wall 109. Due to the special structural design of the membrane wall 109, the heating area of ​​the membrane wall 109 is greatly increased, thereby significantly improving the heat exchange effect of the water inside the membrane wall 109. At the same time, it reduces the furnace temperature, solves the coking problem, reduces the generation of thermal nitrogen oxides, increases the boiler's sealing performance, reduces the air leakage coefficient, and improves the boiler's thermal efficiency.

[0039] In this embodiment of the invention, such as Figure 5 and Figure 6As shown, two wing-shaped walls 115 with membrane wall structures are symmetrically arranged inside the furnace 101. Each wall tube on the wing-shaped wall 115 is connected to the inner cavity of the boiler shell 103. The wing-shaped walls 115 are fixedly installed between the boiler shell 103 and the membrane wall 109. The rear side of the wing-shaped walls 115 is close to the rear wall 111 of the combustion chamber, and a flue gas gap 116 is provided between the two. The flue gas gap 116 is used to connect with the flues 102 on both sides. The rear wall 112 of the furnace is fixedly connected to the two wing-shaped walls 115 at its top. The flue gas 102 is composed of the boiler shell 103, the wing-shaped walls 115 and the membrane wall 109. The flue gas generated by the biomass in the furnace 101 during combustion passes through the flue gas... The flue gas enters the combustion chamber 113 through outlet 114, and then enters the flue 102 on the left and right sides through the flue gap 116. The flue gas entering the flue 102 then enters the flue gas preheating zone through the flue pipe 206 to achieve the purpose of preheating biomass. The water in the boiler shell 103 fills the wall tubes on each airfoil wall 115. Through the special structural design of the flue 102 and the furnace 101, the heat radiation of the combustion process achieves heat exchange with the membrane wall 109 and the airfoil wall 115. At the same time, the flue gas flowing through the flue 102 further achieves heat exchange with the membrane wall 109 and the airfoil wall 115. In this way, heat exchange can be achieved for the water in the entire boiler shell 103.

[0040] In this embodiment of the invention, such as Figure 3 and Figure 4 As shown, a water collection pipe 117 is fixedly installed at the bottom of the membrane wall 109. All wall pipes on the membrane wall 109 are connected to the water collection pipe 117. The wall pipes on the wing-shaped wall 115 are connected to the corresponding wall pipes on the membrane wall 109. An external water pipe 118 is fixedly installed at the bottom of the water collection pipe 117. A control valve 119 is fixedly installed on the external water pipe 118. When the water in the boiler shell 103 reaches the system-set temperature, the biomass combustion is stopped, and the control valves 119 on each external water pipe 118 are opened. The heated water in the boiler shell 103 is then output for use through the water supply pipe connected to the external water pipe 118. The furnace front wall 110... The surface is provided with an installation port 120 and an installation hole 121. The grate feeding box 201 is sealed inside the installation port 120, and the flue duct 206 is sealed inside the installation hole 121. The installation port 120 is connected to the furnace 101, and the installation hole 121 corresponds to the flue 102 and the two are connected. The bottom of the membrane fireplace 1 is fixedly installed with an ash collection box 122. The ash collection box 122 is connected to the furnace 101 through an ash discharge port 123. The ash and slag after combustion fall into the ash collection box 122 through the ash discharge port 123 for collection. A sealed door (not shown in the figure) is installed at the bottom of the ash collection box 122. The ash and slag can be cleaned by opening the sealed door.

[0041] Specific embodiment two, based on specific embodiment one, such as Figure 7 , Figure 9 and Figure 10 As shown, the top of the grate feeding box 201 has a combustion port 207 corresponding to the position of the primary combustion zone. The biomass transported to the primary combustion zone is burned in the combustion zone. The bottom of the grate feeding box 201 has an ash discharge port 208 corresponding to the position of the ash discharge zone and communicating with the ash collection box 122. The ash and slag after combustion fall into the ash collection box 122 through the ash discharge port 208 and the ash discharge port 123 for collection. The inclined conveying channel 205 is fixedly installed on the front side of the grate feeding box 201. The inclined conveying channel 205 is connected to the flue gas preheating zone through the feeding port 209. The top of the grate feeding box 201 has a guide channel 210 located outside the membrane fireplace 1. The guide channel 210 and the inclined conveying channel 205 are connected by a drop port 211. A sealed docking ring 212, which communicates with the inner cavity of the guide channel 210, is fixedly installed on one side of the guide channel 210. The sealed docking ring 212 is sealed and plugged into the boiler shell 103. The sealed docking ring 212 is also connected to the flue gas guide cavity 107. Biomass falls into the inclined conveying channel 205 from the discharge port 211, and then slides down the inclined conveying channel 205 until it enters the flue gas preheating zone from the feed port 209. After preheating, the flue gas enters the inclined conveying channel 205 from the feed port 209, and then enters the guide channel 210 and the sealed docking ring 212 from the discharge port 211. Then it enters the flue gas guide cavity 107 from the sealed docking ring 212 and enters each flue gas heat exchange pipe 108 to achieve heat exchange.

[0042] In this embodiment of the invention, such as Figure 7 and Figure 11 As shown, a vertical guide rod 213 is fixedly installed on the inner wall of the sealed docking ring 212. A biomass conveying box 214, sleeved on the vertical guide rod 213, is slidably arranged inside the guide channel 210. A heat insulation frame 215 is installed on the top of the sealed docking ring 212. The output end of the lifting cylinder 216 installed on the top of the heat insulation frame 215 is connected to the biomass conveying box 214. Thus, the lifting cylinder 216 can control the smooth up and down movement of the biomass conveying box 214. A feeding motor 217 for driving the chain grate 202 to rotate is installed on the outside of the membrane fireplace 1. The transmission system consisting of motor 217 and chain grate 202 is existing technology. The biomass conveying box 214 has an upper feed port 218 and a lower discharge port 219 on the side away from the vertical guide rod 213. The bottom of the biomass conveying box 214 has a downward-extending arc structure. The lower discharge port 219 is set close to the bottom of the biomass conveying box 214. In the initial state, the lower discharge port 219 is aligned with the lower drop port 211, while the upper feed port 218 is blocked. Biomass can be transferred to the inclined conveying channel 205 through the biomass conveying box 214.

[0043] In this embodiment of the invention, such as Figures 9 to 11 As shown, a biomass storage bin 220 is installed on one side of the guide channel 210 relative to the sealed docking ring 212 (both the biomass storage bin 220 and the feeding motor 217 are mounted on the external frame). An inclined guide seat 221 is fixedly installed inside the biomass storage bin 220. An inclined guide channel 222 is located below the inclined guide seat 221. An upper discharge port 223 communicating with the inclined guide channel 222 is opened on the side of the guide channel 210 near the biomass storage bin 220. A limiting slide 224 communicating with the upper discharge port 223 is opened on the surface of the guide channel 210. A through-limiting slide 224 communicating with the upper discharge port 223 is provided inside the biomass storage bin 220. The biomass conveying box 214 is fixed with a support plate 225. The top of the support plate 225 is fixed with an inclined sealing seat 226 that cooperates with the inclined guide seat 221. In the initial state, the lower discharge port 219 is aligned with the lower drop port 211, while the upper feed port 218 is in a blocked state. The preheated flue gas enters the inclined conveying channel 205 through the feed port 209, and then enters the biomass conveying box 214 and the sealed docking ring 212 through the lower drop port 211 and the lower discharge port 219. Then, it enters the flue gas guide cavity 107 through the sealed docking ring 212, and then enters each flue gas heat exchange pipe 108 through the flue gas guide cavity 107 to achieve heat exchange.

[0044] The control system controls the start-up lifting cylinder 216 to drive the biomass conveying box 214 upward to the set position, so that the upper feed port 218 is aligned with the upper discharge port 223, and the lower discharge port 219 moves upward to offset the lower discharge port 211 and is blocked through the inner wall of the guide channel 210. The support plate 225, which moves upward synchronously with the biomass conveying box 214, drives the inclined sealing seat 226 to move upward and separate from the inclined guide seat 221. At this time, a certain amount of biomass in the biomass storage box 220 falls into the inclined guide channel 222 and falls into the biomass conveying box 214 along the upper discharge port 223 and the upper feed port 218. The structural arrangement of the inclined guide channel 222 and the upper discharge port 223 can buffer the speed of the falling biomass, effectively avoiding the blockage of the upper discharge port 223 due to the excessive speed of the falling biomass, thereby achieving effective control of the quality of the biomass entering the biomass conveying box 214.

[0045] After a certain amount of biomass is conveyed into the biomass conveying box 214, the lifting cylinder 216 drives the biomass conveying box 214 downward to reset it, so that the lower discharge port 219 is aligned with the lower drop port 211 again, while the upper feed port 218 moves downward to offset the upper drop port 223 and is blocked through the inner wall of the guide channel 210. The biomass in the biomass conveying box 214 falls into the inclined conveying channel 205 through the lower discharge port 219 and the lower drop port 211, and then enters the flue gas preheating zone through the feed port 209. Subsequently, the chain grate 202 is controlled to rotate counterclockwise by a certain angle (e.g., Figure 11(This angle can be set to 90°) so that all the biomass in the inclined conveyor channel 205 can enter the flue gas preheating zone. Then, the sealing plate is moved up by the sealing cylinder set on the external frame to block the feed port 209 (this sealing cylinder is set below the inclined conveyor channel 205, and the sealing plate slides longitudinally with the inclined conveyor channel 205. The initial position of the sealing plate will not interfere with the biomass falling into the flue gas preheating zone in the inclined conveyor channel 205. The sealing cylinder and sealing plate are conventional settings and are not shown in the figure). The chain grate 202 is then rotated clockwise by the same angle to return to the original position. Figure 11 When the state shown is reached, the chain grate 202 continues to rotate clockwise by a certain angle (system setting) so that the biomass in the flue gas preheating zone is transported to the primary combustion zone (by the action of the two limit push plates 203) for combustion. Then, the sealing plate is moved down by the sealing cylinder to complete the reset (biomass conveying method).

[0046] The heat radiation and hot flue gas generated by combustion are used to heat the water in the boiler. During combustion, a certain amount of biomass is again transported to the flue gas preheating zone. The flue gas flowing through the preheating zone preheats the biomass. After the system-set combustion time is reached, the chain grate 202 is rotated counterclockwise by a certain angle so that all the biomass in the inclined conveying channel 205 can enter the flue gas preheating zone. After the sealing plate moves up to block the feed port 209, the chain grate 202 is rotated clockwise by the same angle. The chain grate 202 is then rotated clockwise by a certain angle (system-set) so that the biomass in the flue gas preheating zone is transported to the primary combustion zone for combustion. Then, the sealing plate is lowered by the sealing cylinder to complete the reset (the feed port 209 reopens). At this point, the biomass feedstock that was originally in the primary combustion zone (having completed primary combustion) is transported to the secondary combustion zone. The biomass feedstock that has completed primary combustion is turned over in the secondary combustion zone, which exposes any unburned biomass that may exist inside the biomass pile so that it can continue to burn, thereby greatly improving the combustion efficiency of biomass and effectively avoiding the waste of biomass energy due to incomplete combustion. Subsequently, following the same control method as described above, the biomass feedstock in the biomass storage box 220 can be continuously transported in batches to the furnace 101 for combustion. As the chain grate 202 continues to rotate, the ash residue after combustion in the secondary combustion zone can be pushed into the second ash discharge port 208 by the limiting pusher plate 203, and then fall into the ash collection box 122 through the second ash discharge port 208 and the first ash discharge port 123 for collection.

[0047] In existing chain grate furnaces, biomass is directly fed to a separate combustion zone. Within the system's set combustion time, incomplete combustion may occur on the inner side of the biomass pile. This can easily lead to the biomass being transported to the ash removal zone during chain grate operation, resulting in a waste of biomass energy. If the combustion time of biomass fuel is extended to ensure complete combustion (i.e., the combustion time after one feeding), there may be inefficient combustion after complete biomass combustion (i.e., no biomass participating in combustion), which can easily lead to energy waste or inefficient heating of the boiler, thus extending the overall boiler heating time and reducing the utilization efficiency of the biomass boiler. This embodiment sets up a primary combustion zone and a secondary combustion zone. Within the system's set combustion time (which is relatively short), the raw materials that are not fully burned in the primary combustion zone are transported to the secondary combustion zone for turning and combustion during the continued feeding process. This greatly improves the combustion efficiency of biomass fuel (with a shorter overall combustion time).

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A membrane wall-mounted DZL type biomass boiler body, characterized in that, The furnace includes a membrane fireplace (1) and a grate feeding mechanism (2). The membrane fireplace (1) includes a furnace chamber (101) and a flue (102) that are interconnected. The grate feeding mechanism (2) is used to transport biomass pellets into the furnace chamber (101). The grate feeding mechanism (2) includes a grate feeding box (201) disposed inside the furnace (101). A chain grate (202) is rotatably installed inside the grate feeding box (201). Several limiting push plates (203) are arrayed on the surface of the chain grate (202). A flue gas preheating zone, a primary combustion zone, a secondary combustion zone and an ash removal zone are respectively disposed between the grate feeding box (201) and the chain grate (202). The flue gas preheating zone, the primary combustion zone, the secondary combustion zone and the ash removal zone are arranged sequentially along the running direction of the chain grate (202). A ventilation hole (204) communicating with the secondary combustion zone is opened on the grate feeding box (201). The membrane fireplace (1) is provided with an inclined conveying channel (205) for feeding materials to the flue gas preheating zone. The flue gas preheating zone is connected to the flue (102) through a flue pipe (206). The flue gas in the flue (102) enters the flue gas preheating zone through the flue pipe (206) to preheat the biomass pellets. After preheating, the flue gas flows back into the membrane fireplace (1) for water heat exchange.

2. The membrane wall-mounted DZL type biomass boiler body according to claim 1, characterized in that, The membrane fireplace (1) also includes a pot shell cylinder (103), with a water inlet (104) installed on the top of the pot shell cylinder (103), a partition plate (105) fixed on the inner wall of the pot shell cylinder (103) near the front, a pot drum rear shell (106) installed on the rear side of the pot shell cylinder (103), a flue gas guide cavity (107) provided on the front side of the pot shell cylinder (103), and a plurality of flue gas heat exchange pipes (108) provided on the inner side of the pot shell cylinder (103). The flue gas heat exchange pipes (108) are fixedly installed between the pot drum rear shell (106) and the partition plate (105). The front end of the flue gas heat exchange pipes (108) is connected to the flue gas guide cavity (107), and the rear end of the flue gas heat exchange pipes (108) is connected to the external environment of the pot shell cylinder (103).

3. The membrane wall-mounted DZL type biomass boiler body according to claim 2, characterized in that, Two membrane walls (109) are symmetrically fixedly installed at the bottom of the boiler shell (103). A furnace front wall (110) is installed on the front side of the membrane wall (109), and a combustion chamber rear wall (111) is installed on the rear side of the membrane wall (109). A furnace rear wall (112) located between the two membrane walls (109) is installed at the bottom of the boiler shell (103). The furnace (101) is located on one side of the furnace rear wall (112), and a combustion chamber (113) is located on the other side of the furnace rear wall (112). The furnace (101) and the combustion chamber (113) are connected through a flue gas outlet (114). Each wall tube on the membrane wall (109) is connected to the inner cavity of the boiler shell (103).

4. The membrane wall-mounted DZL type biomass boiler body according to claim 3, characterized in that, The furnace (101) is symmetrically provided with two wing-shaped walls (115) of membrane wall structure. Each wall tube on the wing-shaped wall (115) is connected to the inner cavity of the boiler shell (103). The wing-shaped wall (115) is fixedly installed between the boiler shell (103) and the membrane wall (109). The rear side of the wing-shaped wall (115) is close to the rear wall (111) of the combustion chamber and there is a flue gas gap (116) between them. The flue gas gap (116) is used to connect with the flues (102) on both sides. The rear wall (112) of the furnace is fixedly connected to the two wing-shaped walls (115) on its top. The flue gas duct (102) is composed of the boiler shell (103), the wing-shaped wall (115) and the membrane wall (109).

5. The membrane wall-mounted DZL type biomass boiler body according to claim 4, characterized in that, A water collection pipe (117) is fixedly installed at the bottom of the membrane wall (109). Each wall pipe on the membrane wall (109) is connected to the water collection pipe (117). The wall pipe on the wing-shaped wall (115) is connected to the corresponding wall pipe on the membrane wall (109). An external water pipe (118) is fixedly installed at the bottom of the water collection pipe (117). A control valve (119) is fixedly installed on the external water pipe (118). The front wall (110) of the furnace is provided with an installation port (120) and an installation hole (121). The grate feeding box (201) is sealed inside the installation port (120). The flue pipe (206) is sealed inside the installation hole (121). The installation port (120) is connected to the furnace (101). The installation hole (121) corresponds to the flue (102) and the two are connected. The bottom of the membrane fireplace (1) is fixedly installed with an ash collection box (122). The ash collection box (122) is connected to the furnace (101) through an ash discharge port (123).

6. The membrane wall-mounted DZL type biomass boiler body according to claim 5, characterized in that, The top of the grate feeding box (201) has a combustion port (207) corresponding to the position of the primary combustion zone, and the bottom of the grate feeding box (201) has an ash discharge port (208) corresponding to the position of the ash discharge zone and communicating with the ash collection box (122). The inclined conveying channel (205) is fixedly installed on the front side of the grate feeding box (201). The inclined conveying channel (205) is connected to the flue gas preheating zone through a feeding port (209). 1) A guide channel (210) is fixedly installed on the top outside the membrane fireplace (1). The guide channel (210) is connected to the inclined conveying channel (205) through the drop port (211). A sealed docking ring (212) connected to its inner cavity is fixedly installed on one side of the guide channel (210). The sealed docking ring (212) is sealed and plugged into the boiler shell cylinder (103). The sealed docking ring (212) is connected to the flue gas guide cavity (107).

7. The membrane wall-mounted DZL type biomass boiler body according to claim 6, characterized in that, A vertical guide rod (213) is fixedly installed on the inner wall of the sealed docking ring (212). A biomass conveying box (214) sleeved on the vertical guide rod (213) is slidably arranged inside the guide channel (210). A heat insulation frame (215) is installed on the top of the sealed docking ring (212). The output end of the lifting cylinder (216) installed on the top of the heat insulation frame (215) is connected to the biomass conveying box (214). A feeding motor (217) for driving the chain grate (202) to rotate is installed on the outside of the membrane fireplace (1). An upper feed port (218) and a lower discharge port (219) are opened on the side of the biomass conveying box (214) away from the vertical guide rod (213). The bottom of the biomass conveying box (214) is an arc structure extending downward. The lower discharge port (219) is set close to the bottom of the biomass conveying box (214).

8. The membrane wall-mounted DZL type biomass boiler body according to claim 7, characterized in that, A biomass storage box (220) is installed on one side of the guide channel (210) relative to the sealed docking ring (212). An inclined guide seat (221) is fixedly installed inside the biomass storage box (220). An inclined guide channel (222) is provided below the inclined guide seat (221). An upper discharge port (223) communicating with the inclined guide channel (222) is opened on the side of the guide channel (210) near the biomass storage box (220). A limiting slide (224) communicating with the upper discharge port (223) is opened on the surface of the guide channel (210). A support plate (225) passing through the limiting slide (224) and fixed to the biomass conveying box (214) is provided inside the biomass storage box (220). An inclined sealing seat (226) cooperating with the inclined guide seat (221) is fixed on the top of the support plate (225).

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