Corner tube type biomass boiler and energy-saving heat supply system

Abstract

The utility model discloses a corner tube type biomass boiler and an energy-saving heat supply system, and the boiler comprises a horizontal boiler body, a burner, a plurality of evaporators and a denitration dust removal device, the horizontal boiler body is provided with a transversely-arranged hearth, a first heat transfer area, a second heat transfer area, a first connecting flue, a second connecting flue, a third connecting flue and a plurality of ash falling hoppers, and the hearth is provided with a burner mounting opening, a first air inlet and a second air inlet. According to the boiler, the hearth, the first heat transfer area and the second heat transfer area are arranged in a modularized mode, the ash falling hopper, the evaporator, the denitration dust removal device and other structures are matched, the boiler is arranged in a horizontal structure, all the components are modularly delivered, the field installation period can be greatly shortened, meanwhile, the boiler body is subjected to multi-stage heat transfer and ash falling treatment, and the boiler is convenient to use. According to the utility model, the heat transfer process is not influenced by fly ash, and flames can be prevented from directly scouring the heating surface in the hearth, so that the hearth is prevented from slagging or coking, and a better heat exchange effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of biomass boiler, specifically relates to a corner pipe type biomass boiler and energy -conserving heating system. BACKGROUND

[0002] Biomass boiler is with biomass energy as fuel boiler, generally biomass boiler is that biomass fuel is sent into hearth by screw feeder, is gradually preheated, dries, ignites, burns under the action of high temperature flue gas and primary air, in this process, a large amount of volatile is separated out, burns fiercely, after the high temperature flue gas produced by the main heating surface of the boiler is washed, enters the boiler tail heating surface economizer and air preheater, then enters dust collector, finally is discharged into the atmosphere through chimney, the fuel that is not gasified moves to the rear of the grate, until burnout, finally a small amount of ash falls into the slagging port behind the grate.

[0003] Because most of the biomass fuel is in the form of direct combustion or gasification combustion, some fly ash or fine ungasified residual carbon is always entrained, resulting in that most of the current biomass boilers are mainly vertical structure, so that fly ash or residual carbon falls back into the hearth and is burned again, due to considering heat transfer and ash removal effect, a higher combustion zone or heat transfer zone is often arranged, such as CN116241876A-a biomass boiler structure with gasification chamber, CN117823886A-gas-solid two-phase high-efficiency combustion biomass boiler, etc., but the overall height of the vertical biomass boiler is higher, generally on-site installation is adopted, resulting in that the on-site installation period is longer, which affects the normal heating of the user. UTILITY MODEL CONTENTS

[0004] In order to overcome the defects of the prior art, one of the purposes of the utility model is to provide a corner pipe type biomass boiler to solve the above-mentioned traditional problems.

[0005] The second purpose of the utility model is to provide an energy-saving heating system using the corner pipe type biomass boiler.

[0006] One of the purposes of the utility model is achieved by the following technical scheme:

[0007] The application discloses an angle tube type biomass boiler which comprises a horizontal boiler body, a burner, a plurality of evaporators and a desulfurization and dust removal device, wherein the horizontal boiler body is provided with a transversely arranged hearth, a first heat transfer zone, a second heat transfer zone, a first connecting flue, a second connecting flue, a third connecting flue and a plurality of ash hoppers; the hearth is provided with a burner mounting port, a first air inlet and a second air inlet; the first air inlet is used for connecting with a pyrolysis gas outlet; the side of the hearth is connected with the first heat transfer zone through the first connecting flue; the first heat transfer zone is connected with the second heat transfer zone through the second connecting flue; the second heat transfer zone is connected with the desulfurization and dust removal device through the third connecting flue; the first heat transfer zone is provided with a plurality of first evaporator mounting ports for mounting the evaporators; and the second heat transfer zone is provided with a plurality of second evaporator mounting ports for mounting the evaporators.

[0008] Preferably, the horizontal boiler body comprises a drum, a main membrane water wall, a lower header, an upper header and a sparse convection tube bundle arranged in a serpentine plane bending structure; the drum is arranged at the top of the horizontal boiler body; the lower header and the upper header are arranged at opposite ends of the main membrane water wall; and the sparse convection tube bundle is used for the convection communication between the drum and the lower header and the upper header.

[0009] Preferably, the horizontal boiler body is further provided with a water communication pipe and a steam communication pipe; one end of the water communication pipe is connected with the bottom of the evaporator; one end of the steam communication pipe is connected with the top of the evaporator; and the other end of the steam communication pipe is connected with the drum.

[0010] Preferably, the horizontal boiler body is further provided with a bypass flue; one end of the bypass flue is connected with the second connecting flue; the other end of the bypass flue is connected with the third connecting flue; and a control valve is arranged on the bypass flue.

[0011] Preferably, the evaporator comprises a water collecting pipe, a water distribution pipe, a secondary membrane water wall connecting the water collecting pipe and the water distribution pipe and a dense convection tube bundle; the water distribution pipe is provided with a first water pipe and a second water pipe; the first water pipe is an arch-shaped pipe; the second water pipe is a straight pipe; and the first water pipe and the second water pipe are arranged in a staggered mode.

[0012] Preferably, the desulfurization and dust removal device comprises, in sequence along the flue gas flow, a cyclone dust collector, a fourth connecting flue, a high-temperature desulfurization device, a high-temperature energy saving device, a fifth connecting flue, a low-temperature energy saving device, a sixth connecting flue, a low-temperature desulfurization device and a bag-type dust collector.

[0013] Preferably, the corner tube biomass boiler further comprises a biomass cracking device, the biomass cracking device comprises a feeding mechanism, a feeding chamber, a cracking gasification chamber, a burnout chamber and a movable material bed, the feeding mechanism comprises a feeding hopper and an elevator, the top of the feeding chamber is provided with a feeding port connected with the elevator; the side top of the cracking gasification chamber is provided with a cracking gas outlet, the movable material bed is arranged at the bottom of the biomass cracking device, and an independently adjustable gasification agent inlet is arranged below the movable material bed; the movable material bed is divided into an inclined part and a lying part, the inclined part is arranged at the bottom of the cracking gasification chamber, the inclined part is arranged to be inclined from the feeding chamber to the burnout chamber, and the lying part is arranged at the bottom of the burnout chamber; the burnout chamber is provided with a communication port in communication with the second gas inlet.

[0014] Preferably, a first partition wall is arranged between the feeding chamber and the cracking gasification chamber, a second partition wall is arranged between the cracking gasification chamber and the burnout chamber, and the bottom of the feeding chamber, the bottom of the cracking gasification chamber and the bottom of the burnout chamber are in communication with each other.

[0015] Preferably, the inclination angle of the inclined part is 20-45°.

[0016] The second purpose of the utility model is achieved by the following technical scheme:

[0017] An energy-saving heating system comprises the corner tube biomass boiler.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] 1. The corner tube biomass boiler of the utility model is modularized in the furnace, the first heat transfer zone and the second heat transfer zone, and is further matched with the ash falling hopper, the evaporator and the dedusting device, so that the boiler is arranged in a horizontal structure, all the components are modularized, the on-site installation period can be greatly reduced, the boiler body is subjected to multi-stage heat transfer and ash falling treatment, the heat transfer process is not affected by the fly ash, the flame in the furnace can be prevented from directly washing the heating surface, the furnace slagging or coking is prevented, and a better heat exchange effect is achieved.

[0020] 2. The biomass pyrolysis combustor is used in the combustor, biomass resources such as agricultural and forestry wastes can be effectively utilized, environmental pollution is reduced, and the energy utilization rate is improved. DRAWINGS

[0021] Figure 1 It is a structure view of the corner tube biomass boiler of the utility model;

[0022] Figure 2 It is a structure view of the corner tube biomass boiler of the utility model; Figure 1 It is a first sectional view of the corner tube biomass boiler shown in the utility model.

[0023] Figure 3 for Figure 1 a second sectional view of the corner tube biomass boiler shown in figure 1;

[0024] Figure 4 for Figure 1 a third sectional view of the corner tube biomass boiler shown in figure 1;

[0025] Figure 5 for Figure 1 a fourth sectional view of the corner tube biomass boiler shown in figure 1;

[0026] Figure 6 for Figure 1 a fifth sectional view of the corner tube biomass boiler shown in figure 1;

[0027] Figure 7 for a connecting structure of the corner tube biomass boiler of the utility model;

[0028] Figure 8 Figure 7 for a three-dimensional structure of the evaporator shown in figure 1;

[0029] Figure 9 Figure 8 for a first sectional view of the evaporator shown in figure 1;

[0030] Figure 10 Figure 8 for a second sectional view of the evaporator shown in figure 1.

[0031] In the figure: 10, biomass cracking device; 11, feeding mechanism; 12, feeding chamber; 13, cracking gasification chamber; 14, burnout chamber; 15, movable material bed; 20, horizontal boiler body; 21, boiler drum; 22, main membrane water wall; 23, lower header; 24, upper header; 25, dilution counterflow tube bundle; 26, furnace; 27, first heat transfer zone; 28, second heat transfer zone; 29, ash fall chute; 30, burner; 40, evaporator; 41, collecting pipe; 42, water distribution pipe; 43, auxiliary membrane water wall; 44, dense arrangement counterflow tube bundle; 50, desulfurization and dust removal device; 51, cyclone dust collector; 52, high-temperature desulfurization device; 53, high-temperature economizer; 54, low-temperature economizer; 55, low-temperature desulfurization device; 56, bag-type dust collector; 60, bypass flue. DETAILED DESCRIPTION

[0032] For the above purposes, features and advantages of the present application to be more apparent and understandable, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners other than those described herein, and it is understood that similar modifications of this nature can be made by those skilled in the art, without departing from the spirit and scope of the present application, therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0034] In the description of the present application, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to another element or there can be an intermediate element. In contrast, when the element is referred to as "directly" connected to another element, there is no intermediate element.

[0035] Please refer to Figures 1-10 The corner pipe type biomass boiler of the preferred embodiment of the present application is used to provide hot water or steam for users, specifically, the corner pipe type biomass boiler comprises a biomass cracking device 10, a horizontal boiler body 20 connected with the biomass cracking device 10, a burner 30 installed on the horizontal boiler body 20, a plurality of evaporators 40 and a desulfurization and dust removal device 50.

[0036] As Figure 2 And Figure 7As shown, the biomass pyrolysis device 10 is used for pyrolysis of the incoming biomass fuel, and specifically, the biomass pyrolysis device 10 comprises a feeding mechanism 11, a feeding chamber 12, a pyrolysis gasification chamber 13, a burnout chamber 14 and a movable material bed 15. The feeding mechanism 11 comprises a feeding hopper for loading the biomass fuel and an elevator. The feeding chamber 12 is provided with a feeding port connected with the elevator at the top. The feeding chamber 12 is provided with a first partition wall between the feeding chamber 12 and the pyrolysis gasification chamber 13. The pyrolysis gasification chamber 13 is provided with a second partition wall between the pyrolysis gasification chamber 13 and the burnout chamber 14. The bottom of the feeding chamber 12, the bottom of the pyrolysis gasification chamber 13 and the bottom of the burnout chamber 14 are communicated with each other. The pyrolysis gasification chamber 13 is provided with a pyrolysis gas outlet at the side top. The movable material bed 15 is arranged at the bottom of the biomass pyrolysis device 10. A gasification agent inlet is arranged below the movable material bed 15 and is independently adjustable to supply the gasification agent to the pyrolysis gasification chamber 13. The movable material bed 15 is divided into an inclined part and a lying part. The inclined part is arranged at the bottom of the pyrolysis gasification chamber 13 and is arranged to be inclined from the feeding chamber 12 to the burnout chamber 14, for example, the inclined angle is 20-45°, preferably 30°, so as to facilitate the gradual conveying of the material for pyrolysis. The lying part is arranged at the bottom of the burnout chamber 14. The burnout chamber 14 is provided with a communication port communicated with the horizontal boiler body 20 to receive the residual carbon or fly ash falling from the horizontal boiler body 20 for secondary pyrolysis and combustion. The pyrolysis gas is conveyed into the horizontal boiler body 20 through the communication port or the gas inlet for combustion.

[0037] The pyrolysis gasification chamber is used to make the biomass fuel to be combusted in low temperature (300-450℃) and poor oxygen, to make the biomass fuel to be pyrolysis gasified efficiently, to provide the heat needed by the biomass fuel to be pyrolysis gasified, and to produce the biomass gas. The thickness of the biomass fuel in the pyrolysis gasification chamber is kept at 400-500mm, which is used to make the fine dust particles produced after the gasification to be bonded into large particles by the sticky material produced by the pyrolysis gasification of the fuel in the bed, and most of the particles are burned into slag after being burned in the combustion chamber, which greatly reduces the content of the particles in the combustible gas entering the boiler furnace 26, and achieves the effect of clean combustion and clean emission, and meets the national environmental emission standard. The movable bed 15 is provided with an independent adjustable gas inlet chamber below it, which promotes the gasification effect of the fuel in the bed, and also plays the role of pushing the pyrolysis gasification fuel, so that the fuel can be uniformly delivered to the bed, and the gasification agent needed by the fuel to be pyrolysis gasified is distributed uniformly, which is convenient for the efficient pyrolysis gasification of the biomass fuel. The gasification agent (the gasification agent is a mixture of air and water vapor, and the volume ratio of air to water vapor is 70-80% to 20-30%) is delivered by the gas inlet chamber below the pyrolysis gasification bed with high pressure head (pressure head above 8kPa), so that the tar and other substances released by the biomass fuel during the pyrolysis enter the upper space of the pyrolysis gasification chamber under the impact of the gasification agent, and the temperature of the space is above 300℃, which is higher than the tar condensation temperature (the tar condensation temperature is about 200℃), so that the biomass fuel can be used efficiently after the pyrolysis gasification. After the fuel in the pyrolysis gasification chamber is pyrolysis gasified, the slag is discharged on line by the movable bed 15.

[0038] In other embodiments, the biomass cracking device 10 can also be a cracking gas delivery pipe or a fuel gas containing fly ash, which will not be described here.

[0039] For example Figures 2-7As shown, the horizontal boiler body 20 is used for igniting and burning the cracking gas and exchanging heat with the high-temperature flue gas to produce hot water or high-temperature steam. The horizontal boiler body 20 is arranged in a horizontal structure. In the cross section, the horizontal boiler body 20 is composed of a horizontal cylinder 21, a main membrane water wall 22, a lower header 23, an upper header 24, and a serpentine plane bending structure of a pull-dilution convection tube bundle 25, which is convenient for heat exchange with the high-temperature flue gas and burning of the carbon residue carried by the flue gas. The horizontal cylinder 21 is arranged at the top of the horizontal boiler body 20. The lower header 23 and the upper header 24 are arranged at opposite ends of the main membrane water wall 22. The pull-dilution convection tube bundle 25 is used for convection communication between the horizontal cylinder 21 and the lower header 23 and the upper header 24. In an embodiment, the horizontal boiler body 20 is provided with a transversely arranged hearth 26, a first heat transfer zone 27, a second heat transfer zone 28, a first connecting flue, a second connecting flue, a third connecting flue, and a plurality of ash hoppers 29. The hearth 26 is provided with a burner 30 mounting port, a first gas inlet, and a second gas inlet. The burner 30 mounting port is used for mounting the burner 30. The first gas inlet is used for connecting the cracking gas outlet of the cracking gasification chamber 13. The second gas inlet is used for connecting the communication port of the burnout chamber 14. The ash hoppers 29 are uniformly distributed at the bottom of the horizontal boiler body 20, which is convenient for collecting fly ash. The side of the hearth 26 is connected with the first heat transfer zone 27 through the first connecting flue. The first heat transfer zone 27 is connected with the second heat transfer zone 28 through the second connecting flue. The second heat transfer zone 28 is connected with the desulfurization and dust removal device 50 through the third connecting flue. It can be understood that the hearth 26, the first heat transfer zone 27, and the second heat transfer zone 28 are connected side by side in the same plane to form a serpentine plane bending structure. The desulfurization and dust removal device 50 is arranged according to the specific position to facilitate the compact arrangement of the overall equipment. The first heat transfer zone 27 is provided with a plurality of first evaporator 40 mounting ports for mounting the evaporator 40. The second heat transfer zone 28 is provided with a plurality of second evaporator 40 mounting ports for mounting the evaporator 40, so that the evaporators 40 are mounted side by side, which is convenient for step-by-step heat transfer, improves the heat transfer effect, and facilitates modular delivery of each zone, convenient transportation, on-site installation, and easy maintenance of the evaporator 40, avoiding the serious influence of ash and carbon deposition on heat transfer.

[0040] In the embodiment, the hearth 26 is arranged in a rectangular shape. In order to prevent the flame from directly washing the heating surface to prevent the hearth 26 from being slagged or coked, the length of the hearth 26 is 2-5 times the length of the flame of the burner 30. Preferably, the size of the hearth 26 is 9180*2210*22660mm, and the maximum size of the flame of the burner 30 is Φ2000*7500mm. The boiler body convection zone is provided with a soot blower interface, and a soot blowing device can be installed to blow the fly ash in the boiler.

[0041] In another embodiment, the horizontal boiler body 20 is further provided with a bypass flue 60, one end of the bypass flue 60 is connected with the second connecting flue, the other end of the bypass flue 60 is connected with the third connecting flue, and a control valve is installed on the bypass flue 60, wherein the second connecting flue is provided with a first pressure transmitter, a first thermometer and a first temperature sensor, the third connecting flue is provided with a second pressure transmitter, a second thermometer and a second temperature sensor, when the second temperature sensor detects that the flue gas temperature in the third connecting flue does not meet the denitration temperature requirement of the denitration dust removal device 50, and the first temperature sensor detects that the flue gas temperature in the second connecting flue meets the denitration temperature requirement, the control valve is opened to transport the high-temperature flue gas in the second connecting flue into the third connecting flue, so as to ensure the normal operation of the denitration dust removal device 50.

[0042] When the boiler is running at low load, the outlet flue gas temperature after the evaporation heating surface of the boiler will decrease due to the decrease of the boiler heat load, in order to ensure that the denitration reaction can be normally carried out, the user must select a low-temperature denitration catalyst, and the denitration operation cost will be increased. When the boiler load is at full load, the flue gas temperature will also increase, and the low-temperature denitration catalyst cannot meet the denitration requirement. Therefore, during the variable load process of the boiler, part of the high-temperature flue gas can be extracted from the position of the second connecting flue into the denitration dust removal device 50, so as to adjust the reaction temperature in the device, and ensure that the reaction temperature entering the denitration dust removal device 50 is in the range of 280-310℃, so as to ensure efficient catalysis, and ensure the normal operation of the denitration device during the variable load process of the boiler.

[0043] In the embodiment, the horizontal boiler body 20 is further provided with a water communication pipe and a steam communication pipe, one end of the water communication pipe is connected with the water supply end, the other end of the water communication pipe is connected with the bottom of the evaporator 40, so as to provide reliable water supply for the evaporator 40, one end of the steam communication pipe is connected with the top of the evaporator 40, the other end of the steam communication pipe is connected with the boiler drum 21, and the water vapor generated by the evaporator 40 is transported into the boiler drum 21 for steam-water separation.

[0044] In one of the embodiments, as shown in Figures 8-10As shown, the evaporator 40 is an external evaporator 40 structure, specifically, the evaporator 40 includes a water collecting pipe 41, a water distribution pipe 42, a secondary membrane water cooling wall 43 connecting the water collecting pipe 41 and the water distribution pipe 42, and a densely arranged convection tube bundle 44, the water distribution pipe 42 is provided with a first water pipe and a second water pipe, the first water pipe is an arch-shaped pipe, the second water pipe is a straight pipe, the first water pipe and the second water pipe are staggered to form a staggered structure, which increases the lower dust falling space and is more conducive to the settlement of dust in the flue gas. Optionally, the opposite ends of the secondary membrane water cooling wall 43 are outwardly bent to increase the dust falling space between the secondary membrane water cooling wall 43 and the densely arranged convection tube bundle 44, and to buffer the water in the tube and improve the heat exchange performance of the outer wall, that is, to reduce the middle space for heat exchange, wherein the angle of the opposite ends of the secondary membrane water cooling wall 43 outwardly bending is 140°-160°.

[0045] In one embodiment, as shown in Figure 7 The desulfurization and dust removal device 50 includes a cyclone dust collector 51, a fourth connecting flue, a high-temperature desulfurization device 52, a high-temperature economizer 53, a fifth connecting flue, a low-temperature economizer 54, a sixth connecting flue, a low-temperature desulfurization device 55, and a bag dust collector 56 arranged in sequence along the flue gas flow, the cyclone dust collector 51 is connected with one end of the third connecting flue, and the outlet of the bag dust collector 56 is connected with the chimney. The above-mentioned devices remove dust from the flue gas by dust collectors, desulfurization devices, etc., so that the flue gas meets the standard for external discharge, and at the same time, the economizers are arranged to recover the waste heat of the flue gas, thereby improving the energy-saving effect of the system. The high-temperature economizer 53 and the low-temperature economizer 54 are both composed of light pipes and serpentine pipes.

[0046] The working principle is as follows:

[0047] (1) Flue gas flow:

[0048] The biomass such as agricultural and forestry waste is transported into the biomass pyrolysis device 10 for thermal cracking, the cracking gas enters the horizontal boiler body 20 through the first gas inlet (air enters from the other side to mix with the cracking gas), ignites and burns through the burner 30, the high-temperature flue gas heats the main membrane water cooling wall 22 of the furnace 26, then flows into the first heat transfer zone 27 through the first connecting flue, then transfers heat to the evaporator 40 and the main membrane water cooling wall 22 in turn, then flows into the second heat transfer zone 28 through the second connecting flue, and then transfers heat to the evaporator 40 and the main membrane water cooling wall 22 again. Then, it enters the desulfurization and dust removal device 50 for dust removal, desulfurization, and waste heat recovery. During the flue gas flow, most of the fly ash and residual carbon fall into the dust hopper 29 for subsequent treatment, and a small part of the fly ash is treated by the desulfurization and dust removal device 50.

[0049] (2) System water flow:

[0050] The pure water successively passes through the low-temperature economizer 54, the high-temperature economizer 53 to recover waste heat, and then passes through the evaporator 40 on the second heat transfer zone 28 and the first heat transfer zone 27 to perform convection heat exchange, the steam obtained by the evaporator 40 is transported to the drum 21 to perform steam-water separation, the separated hot water is branched to each convection tube bundle and enters each water wall and the evaporator 40 to perform heat exchange again, and the high-temperature steam is output to the outside.

[0051] Compared with the biomass angle tube boiler and the biomass SZS boiler on the market, the boiler has the following characteristics:

[0052] 1. The boilers on the market are mainly vertical, and the overall layout of the boiler is a horizontal angle tube boiler, which has a small floor area and low construction cost.

[0053] 2. Each component of the boiler is modularized, which can greatly reduce the installation period on site. Meanwhile, the modular design can be more flexible under the premise of meeting the maximum transportation size. Different modules can be combined according to requirements to adapt to different heat loads.

[0054] 3. Compared with the convection tube bundle of the conventional biomass SZS boiler, the lower header of the convection tube bundle of the boiler is arranged in high and low positions, which increases the lower ash falling space and is more conducive to the settlement of dust in the flue gas. Meanwhile, the ash falling hopper 29 is arranged at the bottom of the boiler, which is convenient for collecting and conveying the falling ash during the operation of the boiler. The screw conveyor and the scraper conveyor can be arranged at the bottom of the ash hopper to improve the degree of mechanization and reduce the operation intensity of the stoker.

[0055] 4. A flue gas bypass interface is arranged in the connecting flue between the boiler body and the external evaporator 40.

[0056] When the boiler is running at low load, the outlet flue gas temperature after the evaporation heating surface of the boiler will also decrease due to the decrease of the boiler heat load. In order to ensure that the denitration reaction can be normally performed, the user must select a low-temperature denitration catalyst, and the operation cost of the denitration will increase. When the boiler load is at full load, the flue gas temperature will also increase, and the low-temperature denitration catalyst cannot meet the denitration requirement.

[0057] Therefore, during the variable load process of the boiler, part of the high-temperature flue gas can be extracted from the position and enter the SCR device or the cyclone dust collector 51 before the SCR device, so as to adjust the reaction temperature in the SCR device. The reaction temperature entering the SCR device is ensured to be in the range of 280 DEG C to 310 DEG C, so as to ensure high-efficiency catalysis, and the denitration device can also ensure normal operation during the variable load process of the boiler.

[0058] 5. The burner 30 adopts a biomass pyrolysis burner 30, which can effectively utilize biomass resources such as agricultural and forestry wastes and reduce environmental pollution, and meanwhile improve the energy utilization rate.

[0059] In another embodiment, the utility model also provides a kind of energy-saving heating system, including the corner pipe type biomass boiler of above-mentioned embodiment, reach preferable energy-saving heating effect by connecting heating pipeline.The device is also provided with corresponding control instrument and control equipment, to facilitate its automation control, and coated with insulating layer outside, improve its thermal efficiency.

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0061] The above-mentioned embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of variations and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A biomass boiler of the corner tube type, characterized in that, The horizontal boiler body is composed of a horizontal boiler body, a burner, several evaporators and a desulfurization and dust removal device, the horizontal boiler body is provided with a transversely arranged hearth, a first heat transfer zone, a second heat transfer zone, a first connecting flue, a second connecting flue, a third connecting flue and several ash hoppers, the hearth is provided with a burner mounting port, a first air inlet and a second air inlet, the first air inlet is used for connecting with a pyrolysis gas outlet, the side of the hearth is connected with the first heat transfer zone through the first connecting flue, the first heat transfer zone is connected with the second heat transfer zone through the second connecting flue, the second heat transfer zone is connected with the desulfurization and dust removal device through the third connecting flue, the first heat transfer zone is provided with several first evaporator mounting ports for mounting the evaporators, and the second heat transfer zone is provided with several second evaporator mounting ports for mounting the evaporators.

2. The biomass boiler according to claim 1, characterized in that The horizontal boiler body is composed of a horizontal boiler body, a burner, several evaporators and a desulfurization and dust removal device, the horizontal boiler body is provided with a transversely arranged hearth, a first heat transfer zone, a second heat transfer zone, a first connecting flue, a second connecting flue, a third connecting flue and several ash hoppers, the hearth is provided with a burner mounting port, a first air inlet and a second air inlet, the first air inlet is used for connecting with a pyrolysis gas outlet, the side of the hearth is connected with the first heat transfer zone through the first connecting flue, the first heat transfer zone is connected with the second heat transfer zone through the second connecting flue, the second heat transfer zone is connected with the desulfurization and dust removal device through the third connecting flue, the first heat transfer zone is provided with several first evaporator mounting ports for mounting the evaporators, and the second heat transfer zone is provided with several second evaporator mounting ports for mounting the evaporators.

3. The biomass corner-fired furnace as claimed in claim 2, wherein, The horizontal boiler body is composed of a horizontal boiler body, a burner, several evaporators and a desulfurization and dust removal device, the horizontal boiler body is provided with a transversely arranged hearth, a first heat transfer zone, a second heat transfer zone, a first connecting flue, a second connecting flue, a third connecting flue and several ash hoppers, the hearth is provided with a burner mounting port, a first air inlet and a second air inlet, the first air inlet is used for connecting with a pyrolysis gas outlet, the side of the hearth is connected with the first heat transfer zone through the first connecting flue, the first heat transfer zone is connected with the second heat transfer zone through the second connecting flue, the second heat transfer zone is connected with the desulfurization and dust removal device through the third connecting flue, the first heat transfer zone is provided with several first evaporator mounting ports for mounting the evaporators, and the second heat transfer zone is provided with several second evaporator mounting ports for mounting the evaporators.

4. The biomass boiler according to claim 1, characterized in that, The horizontal boiler body is composed of a horizontal boiler body, a burner, several evaporators and a desulfurization and dust removal device, the horizontal boiler body is provided with a transversely arranged hearth, a first heat transfer zone, a second heat transfer zone, a first connecting flue, a second connecting flue, a third connecting flue and several ash hoppers, the hearth is provided with a burner mounting port, a first air inlet and a second air inlet, the first air inlet is used for connecting with a pyrolysis gas outlet, the side of the hearth is connected with the first heat transfer zone through the first connecting flue, the first heat transfer zone is connected with the second heat transfer zone through the second connecting flue, the second heat transfer zone is connected with the desulfurization and dust removal device through the third connecting flue, the first heat transfer zone is provided with several first evaporator mounting ports for mounting the evaporators, and the second heat transfer zone is provided with several second evaporator mounting ports for mounting the evaporators.

5. The biomass boiler according to claim 1, wherein The desulfurization and dust removal device comprises a cyclone dust collector, a fourth connecting flue, a high-temperature desulfurization device, a high-temperature economizer, a fifth connecting flue, a low-temperature economizer, a sixth connecting flue, a low-temperature desulfurization device and a bag dust collector arranged in sequence along the flue gas flow.

6. The biomass corner-fired furnace as set forth in claim 1, wherein The angle pipe type biomass boiler further comprises a biomass pyrolysis device, the biomass pyrolysis device comprises a feeding mechanism, a feeding chamber, a pyrolysis gasification chamber, a burnout chamber and a movable material bed, the feeding mechanism comprises a feeding hopper and an elevator, the top of the feeding chamber is provided with a feeding port connected with the elevator; the side top of the pyrolysis gasification chamber is provided with a pyrolysis gas outlet, the movable material bed is arranged at the bottom of the biomass pyrolysis device, and an independently adjustable gasification agent inlet is arranged below the movable material bed; the movable material bed is divided into an inclined part and a lying part, the inclined part is arranged at the bottom of the pyrolysis gasification chamber, the inclined part is arranged to be inclined from the feeding chamber to the burnout chamber, the lying part is arranged at the bottom of the burnout chamber, and the burnout chamber is provided with a communication port connected with the second air inlet.

7. The biomass corner-fired furnace as set forth in claim 1, wherein ​ 8. The biomass corner-fired furnace as set forth in claim 7, wherein A first partition wall is arranged between the feeding chamber and the pyrolysis gasification chamber, a second partition wall is arranged between the pyrolysis gasification chamber and the burnout chamber, and the bottom of the feeding chamber, the bottom of the pyrolysis gasification chamber and the bottom of the burnout chamber are communicated with each other.

9. The biomass boiler according to claim 7, characterized in that The inclination angle of the inclined part is 20-45°.

10. An energy efficient heating system, characterized by, A biomass boiler comprising a corner tube as claimed in any one of claims 1-9.

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