Combustion control system of baled straw direct-fired boiler

Abstract

The invention discloses a straw bale direct combustion boiler combustion control system which comprises a fire grate, a boiler falling on the fire grate, a stock bin at the front end of the fire grate, a stock bin negative pressure meter detection opening in the upper position of the stock bin, a feeding device connected with a stock bin opening, a combustion cavity at the lower end of the stock bin, namely a main combustion area, and a bale breaking device in the upper position in the combustion cavity. A hearth temperature sensor is arranged at the position, close to the connecting arch, of the boiler, and a controller, a fire grate speed reducer, a burnout fan, a fire grate air blower, a heat exchange cylinder, a dust remover, an induced draft fan and a chimney are further arranged. The frequency of the feeding device, the frequency of the bag breaking device, the frequency of the air blowing and inducing fan and the frequency of the fire grate speed reducer can be controlled in a linkage mode according to the hearth temperature condition, and dynamic combustion is achieved; micro-negative pressure in the stock bin is realized by detecting the pressure in the stock bin, so that smoke return and fire return of a stock bin opening are avoided; and through daily and powerful modes of the bag breaking device, the problems of non-uniform material falling and bag breaking efficiency of straws with different qualities are solved, and the practicability is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural equipment, and in particular to a combustion control system for a straw bale direct-fired boiler. Background Art

[0002] With the development of straw bale direct combustion technology, the requirements for automatic control are getting higher and higher, and the linkage between straw bale direct combustion boilers and various auxiliary machines is becoming more and more important. Currently, most of the existing control systems are based on the coal-fired boiler control system with some auxiliary functions added. However, the combustion conditions of coal and straw bale fuel are completely different. The combustion condition of coal is relatively stable, while the combustion condition of straw bale is very complex and unstable due to the influence of moisture content and impurity content. Therefore, there is an urgent need for a combustion control system that is tailored to the combustion characteristics of straw bale direct combustion boilers. Summary of the invention

[0003] In order to overcome the defects existing in the above-mentioned prior art, the purpose of the present invention is to propose a combustion control system for a bale of straw direct-fired boiler, which can realize the dynamic and stable combustion of the bale of straw through linkage control, and how to maintain a slight negative pressure in the silo and solve the problems of uneven material falling and the efficiency of breaking bales of straw of different qualities.

[0004] To achieve the above purpose, the present invention proposes a combustion control system for a straw bale direct-fired boiler, and the specific technical scheme is as follows: A combustion control system for a bale straw direct-fired boiler comprises a grate and a boiler placed on the grate; The silo is a full membrane wall structure and is placed at the front end of the grate. A silo negative pressure gauge detection port is provided at the upper position of the silo; A feeding device, the feeding device is connected to the silo opening on one side of the silo, a dust cover is provided at the connection, a high temperature resistant stainless steel sealing door is provided inside the dust cover, and a quick lifting sealing door is provided at the inlet of the dust cover; A combustion chamber, which is a main combustion zone and is arranged at the lower end of the silo; a side wall of the combustion chamber close to the boiler is provided with a fire outlet, the fire outlet is connected to the boiler through a connecting arch, and a furnace temperature sensor is arranged near the connecting arch of the boiler; A bag breaking device, the bag breaking device is arranged at an upper position in the combustion chamber and at a certain height from the grate surface; A high-pressure bag-breaking blower, which is located below the bag-breaking device and connected to a wind box; A grate reducer, the grate reducer is arranged at one side of the front end of the grate; A burnout fan, the burnout fan is arranged at the front end of the boiler close to the combustion chamber and below the furnace temperature sensor; A grate blower, the grate blower is located below the heat exchange cylinder and connected to the grate; The combustion control system of the baled straw direct-fired boiler also includes a heat exchanger, a dust collector, an induced draft fan and a chimney. The heat exchanger inlet smoke box is connected to the boiler, the heat exchanger outlet smoke box is connected to the dust collector smoke inlet, the dust collector smoke outlet is connected to the induced draft fan air inlet, and the induced draft fan smoke outlet is connected to the chimney.

[0005] Preferably, the fast lifting sealing door and the high temperature resistant stainless steel sealing door always keep one door in a closed state during the loading process, so as to control the air intake to the greatest extent to maintain the boiler running at a slight negative pressure; The combustion control system of the bale straw direct-fired boiler is also provided with a controller, which reads the reading by detecting the negative pressure gauge of the silo during feeding, and is used to adjust the frequency of the blower and the induced draft fan to keep the boiler running at a slight negative pressure.

[0006] Preferably, the controller is used to control the feeding frequency, the bag breaking device frequency, the grate reducer frequency, and the blower and induced draft fan frequency in a linkage manner according to the feedback signal of the furnace temperature sensor to achieve efficient and stable load output.

[0007] Preferably, the bag breaking device is composed of several groups of bag breaking units, each group of bag breaking units has a bag breaking roller and a reducer, and the rotation direction of the bag breaking roller is controlled by controlling the reducer. The control mode is divided into a daily mode and a strong mode; When the program is set to daily mode, all the bale breaking rollers rotate to the left together, and then rotate to the right together after a certain interval, so that the bale straw moves left and right on the bale breaking rollers, breaking while moving, so that the broken straw fuel falls onto the grate more evenly; When the program is set to strong mode, the two adjacent bale breaking rollers rotate in opposite directions, and then rotate in the opposite direction after a certain interval, which is used to increase the disturbance of the bale of straw and reduce the difficulty of breaking the bale.

[0008] Preferably, the bag breaking unit also includes a first sealing component, a second sealing component and a heat collecting air distribution pipe, wherein the bag breaking roller is a hollow structure, the outer surface of the bag breaking roller is provided with a plurality of raised hollow spikes connected thereto, and the other end of the hollow spikes forms a second air outlet; the outer surface of the heat collecting air distribution pipe is provided with a plurality of raised hollow short tubes connected thereto, and the other end of the hollow short tubes forms a first air outlet; one end of the bag breaking roller is connected to the reducer through the first sealing component, and the other end is connected to the heat collecting air distribution pipe in the maintenance space outside the combustion chamber through the second sealing component.

[0009] Preferably, the bellows is arranged outside the side wall of the silo away from the boiler and is located below the reducer; one side of the bellows is connected to the high-pressure bag breaking blower, and the opposite side is connected to one end of the heat collecting air distribution pipe.

[0010] Preferably, the combustion chamber side wall is a concrete-wrapped membrane wall structure, and the concrete has heat storage properties and is used to create a high-temperature environment.

[0011] Preferably, the combustion control system of the bale straw direct-fired boiler also includes a feeding device winch, a feeding pusher and an observation hole. The feeding device winch is located below the feeding device and operates by dragging the feeding pusher through a steel wire rope.

[0012] Preferably, the working principle of the combustion control system of the bale straw direct-fired boiler is as follows: the pusher of the feeding device waits at the starting position for the bag grabbing machine to load the material. After the bag grabbing machine puts the bale straw fuel in place, the feeding switch is started, and the hoist of the feeding device drags the pusher forward through the wire rope to push the bale straw fuel. At the same time, the rapid lifting and sealing door opens, and when the pusher and the bale straw fuel pass through, they fall down, and the pusher continues to push the bale straw fuel until the bale straw fuel pushes open the high-temperature resistant stainless steel sealing door, and the bale straw falls into the silo, and the hoist of the feeding device reverses to drag the pusher back, and the rapid lifting and sealing door opens and falls after the pusher has completely passed, and the pusher is dragged to the starting position and stops, thereby completing a single feeding process; The bale of straw fuel entering the silo falls onto the bale breaking roller of the bale breaking device. The high-pressure wind enters the wind box from the outlet of the high-pressure bale breaking blower and is distributed to several groups of heat collecting air distribution pipes. The high-pressure wind exchanges heat with the heat collecting air distribution pipes to form high-temperature and high-pressure wind, which is ejected from the first and second air outlets in turn; the reducer drives the bale breaking roller to rotate, the hollow spikes tear the bale of straw fuel, and the second air outlet ejects high-temperature and high-pressure wind, creating a high-temperature environment locally, making it easier to break up, dry and burn the bale of straw fuel. The scattered burning fuel falls naturally through the first outlet of the heat collecting air distribution pipe, and the high-temperature and high-pressure air is sprayed out to assist combustion again, and then falls on the grate. This process all takes place in the combustion chamber; the burning fuel enters the boiler through the fire outlet through the connecting arch along the grate, and at the same time, the burnout fan and the grate blower continue to supply combustion-supporting air to make the fuel burn out completely; the high-temperature flue gas generated by the combustion exchanges heat with the boiler's water cooling system, enters the heat exchange cylinder, exchanges heat again, and then enters the dust collector for dust removal. The flue gas that meets the standards is discharged to the outside through the induced draft fan and chimney, completing the heat exchange; The controller controls the frequency of the feeding, bag breaking device, induced draft fan and grate reducer in conjunction with the boiler furnace temperature to achieve dynamic and stable combustion.

[0013] Compared with the prior art, the present invention provides a combustion control system for a bale straw direct-fired boiler, which enables the feeding device, bale breaking device, high-pressure bale breaking blower, grate blower, grate reducer and induced draft fan of the bale straw direct-fired boiler to be closely linked, and the frequencies of the feeding, bale breaking device, induced draft fan and grate reducer are linked and controlled according to the boiler furnace temperature to achieve dynamic combustion; the bale breaking device is provided with a daily mode and a strong mode to solve the problems of uneven material dropping and the effect of different straw qualities on bale breaking efficiency; the frequency of the high-pressure bale breaking blower, chain grate blower and induced draft fan during feeding is controlled by detecting the pressure in the silo to achieve a slight negative pressure in the silo to avoid smoke and fire backflow at the silo mouth; in addition, the combustion control system of the bale straw direct-fired boiler is controlled by PLC, and the process and various data are displayed intuitively, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the side structure of the combustion control system of the present invention; Figure 2 It is a schematic diagram of the structure of the bag breaking unit in the bag breaking device of the combustion control system of the present invention.

[0015] Description of the numbers in the figure: Feeding device, 2. Silo, 3. Combustion chamber, 4. Bag breaking device, 41. Reducer, 42. Bag breaking roller, 43. Second air outlet, 44. Heat collecting air distribution duct, 45. First air outlet, 5. Grate, 6. Boiler, 7. Rapid lifting sealing door, 8. Dust cover, 9. High temperature resistant stainless steel sealing door, 10. Silo opening, 11. Silo negative pressure gauge, 12. Maintenance space, 13. High pressure bag breaking blower, 14. Bellows, 15. Grate reducer, 16. Fire outlet, 17. Connecting arch, 18. Furnace temperature sensor, 19. Burnout fan, 20. Heat exchange cylinder, 21. Grate blower, 22. Dust collector, 23. Draft fan, 24. Chimney, 25. Feeding device winch, 26. Pusher, 27. Observation hole. DETAILED DESCRIPTION

[0016] In order to better understand the purpose, structure and function of the present invention, a combustion control system for a bale straw direct-fired boiler of the present invention is further described in detail below with reference to the accompanying drawings.

[0017] Figure 1 The structure of an embodiment of a combustion control system for a straw bale direct-fired boiler of the present invention is shown as follows: Figure 1As shown, a combustion control system for a bale straw direct-fired boiler mainly includes a feeding device 1, a silo 2, a bag breaking device 4, a combustion chamber 3, a high-pressure bag breaking blower 13, a grate 5, a grate reducer 15, a grate blower 20, a burnout blower 18, a boiler 6, a heat exchange cylinder 19, a dust collector 21, an induced draft fan 22 and a chimney 23. The silo 2 is a full membrane wall structure, with a combustion chamber 3 at the lower end, which is the main combustion area, and a side wall of the combustion chamber 3 is a concrete-wrapped membrane wall structure, which has heat storage properties and is used to create a high-temperature environment. The silo 2 falls on the grate 5 and is arranged at the front end of the grate 5. The side wall of the combustion chamber 3 at the lower end of the silo 2, which is close to the boiler 6, is provided with a fire outlet 16, which is connected to the boiler 6 through a connecting arch 17, and the boiler 6 falls on the grate 5. The feeding device 1 is connected to the silo opening 10 on one side of the silo 2, and a dust cover 8 is provided at the connection, a high temperature resistant stainless steel sealing door 9 is provided inside the dust cover 8, and a quick lifting sealing door 7 is provided at the inlet of the dust cover 8. The bag breaking device 4 is arranged at an upper position in the combustion chamber 3, at a certain height from the grate 5 surface. The high pressure bag breaking blower 13 is located below the bag breaking device 4 and connected to the bellows 14. The detection port of the silo negative pressure gauge 11 is arranged at the upper part of the silo 2. The furnace temperature sensor 18 is arranged at the front end of the boiler 6 near the connecting arch 17. The grate reducer 15 is arranged at one side of the front end of the grate 5 and below the high pressure bag breaking blower 13, the burnout blower 19 is arranged at the front end of the boiler 6 near the combustion chamber 3 and below the furnace temperature sensor 18, and the grate blower 21 is located below the heat exchange cylinder 20 and connected to the grate 5. The heat exchange tube 20 inlet smoke box is connected to the boiler 6, the heat exchange tube 20 outlet smoke box is connected to the dust collector 22 smoke inlet, the dust collector 22 smoke outlet is connected to the induced draft fan 23 air inlet, and the induced draft fan 23 smoke outlet is connected to the chimney 24. The combustion chamber 3 is the main combustion area, and its side wall is a concrete wrapped membrane wall structure. The side wall close to the boiler 6 is provided with a fire outlet 16, and the fire outlet 16 is connected to the boiler 6 through a connecting arch 17. Concrete has heat storage capacity, which can provide favorable conditions for creating a high temperature environment for the combustion chamber 3.

[0018] like Figure 1 and Figure 2 As shown, the bag breaking device 4 is composed of several groups of bag breaking units, and the bag breaking units include a reducer 41, a bag breaking roller 42, a first sealing component, a second sealing component and a heat collecting air distribution pipe 44. The bag breaking roller 42 is a hollow structure, and the outer surface of the bag breaking roller 42 is provided with several raised hollow spikes communicating with it, and the other end of the hollow spikes forms a second air outlet 43; the outer surface of the heat collecting air distribution pipe 44 is provided with several raised hollow short tubes communicating with it, and the other end of the hollow short tube forms a first air outlet 45. One end of the bag breaking roller 42 is connected to the reducer 41 through the first sealing component, and the other end of the bag breaking roller 42 is connected to the heat collecting air distribution pipe 44 in the maintenance space 12 outside the combustion chamber 3 through the second sealing component.

[0019] like Figure 1As shown, the bellows 14 is arranged outside the side wall of the silo 2 away from the boiler 6 and below the reducer 41. One side of the bellows 14 is connected to the high-pressure bag breaking blower 13, and the opposite side is connected to one end of the heat collection air distribution pipe 44.

[0020] The bundled straw fuel entering the silo 2 falls onto the bag breaking roller 42 of the bag breaking device 4. The high-pressure air is input into the wind box 14 by the high-pressure bag breaking blower 13 and distributed to a number of heat collecting air distribution pipes 44 by the wind box 14. The high-pressure air exchanges heat with the heat collecting air distribution pipes 44 to form high-temperature and high-pressure air, which is ejected from the first air outlet 45 and the second air outlet 43 in sequence. At the same time, the reducer 41 drives the bag breaking roller 42 to rotate, and the hollow spikes tear the bundled straw fuel. At this time, the second air outlet 43 ejects high-temperature and high-pressure air, creating a high-temperature environment locally, making it easier to break up, dry and burn the bundled straw fuel. The scattered and burned fuel naturally falls through the first air outlet 45 of the heat collecting air distribution pipe 44, and then ejects high-temperature and high-pressure air to assist combustion again, and then burns violently. The bundled straw fuel is scattered, dried, burned, falls through the second air outlet 43, the first air outlet 45 high temperature and high pressure wind assists combustion, and falls onto the grate 5. This process all takes place in the combustion chamber 3. The concrete in the combustion chamber 3 creates a high temperature environment after heat storage, which helps the fuel burn more fully. The burning fuel enters the boiler 6 through the fire outlet 16 and the connecting arch 17 and moves to the rear of the boiler 6 along the grate 5. The main combustion area is set at the front end of the grate 5, and the fuel has sufficient time and space to burn out.

[0021] The bag breaking device 4 is composed of several groups of bag breaking units, each group of bag breaking units is equipped with a reducer 41, and the rotation direction of the bag breaking roller 42 is controlled by controlling the reducer 41. The control mode is divided into a daily mode and a strong mode. Since the bale of straw naturally falls onto the bag breaking roller after entering the silo, it may be biased to the left or right, resulting in an uneven fuel layer after crushing. To solve this problem, the program sets the daily mode, and all the bag breaking rollers 42 rotate to the left together, and then rotate to the right together after a certain interval, so that the bale of straw moves left and right on the bag breaking roller, and is crushed while moving, so that the crushed straw fuel can fall more evenly onto the grate 5. Due to the different types and qualities of the bale of straw, the difficulty of breaking the bale is also different. To solve this problem, the program sets the strong mode, and the two adjacent bag breaking rollers 42 rotate in opposite directions, and then rotate in the opposite direction after a certain interval, so as to increase the disturbance of the bale of straw and reduce the difficulty of breaking the bale.

[0022] The combustion control system of the bale straw direct-fired boiler is also provided with a controller. The fast lifting sealing door 7 and the high-temperature resistant stainless steel sealing door 9 always keep one door in a closed state during the loading process, so as to control the air intake to the greatest extent to maintain the micro-negative pressure operation of the boiler; at the same time, the controller will detect the silo negative pressure gauge 11 set at the upper part of the silo to read the reading when loading, so as to adjust the frequency of the high-pressure bale breaking blower 13, the grate blower 21, the burnout fan 19, and the induced draft fan 23 to keep the boiler running at a micro-negative pressure.

[0023] The controller controls the feeding frequency, the frequency of the reducer 41 of the bag breaking device 4, the frequency of the grate reducer 15, and the frequencies of the high-pressure bag breaking blower 13, the grate blower 21, the burnout fan 19, and the induced draft fan 23 according to the feedback signal of the furnace temperature sensor 18 to achieve an efficient and stable load output.

[0024] The combustion control system of the bale straw direct-fired boiler also includes a feeding device winch 25, a pushing cart 26 and an observation hole 27. The feeding device winch 25 is located below the feeding device 1 and is operated by dragging the pushing cart 26 with a steel rope; the observation hole 27 is arranged on the top of the silo; the pushing cart 26 is placed on the feeding device 1 and is used to push the bale straw fuel.

[0025] The working principle of the present invention is as follows: the pusher 26 of the feeding device 1 waits for the bag grabbing machine to load at the starting position. After the bag grabbing machine burns the bales of straw in place, the feeding switch is started, and the hoist 25 of the feeding device drags the pusher 26 forward through the wire rope to push the bales of straw fuel. At the same time, the rapid lifting and sealing door 7 is opened, and the pusher 26 falls down after the bales of straw fuel pass through. The pusher 26 continues to push the bales of straw fuel until the bales of straw fuel push open the high-temperature resistant stainless steel sealing door 9, and the bales of straw fall into the silo 2. The hoist 25 of the feeding device reverses and drags the pusher 26 back. Similarly, the rapid lifting and sealing door 7 is opened and falls down after the pusher 26 passes completely. The pusher 26 is dragged to the starting position and stops, and the feeding process is completed. The bundled straw fuel entering the silo 2 falls onto the bag breaking roller 42 of the bag breaking device 4. The bag breaking device 4 is composed of a plurality of bag breaking units, wherein the bag breaking roller 42 is a hollow structure, one end of which is connected to the reducer 41 through a first sealing component, and the other end is connected to the heat collecting air distribution pipe 44 through a second sealing component. The bag breaking roller 42 is provided with a plurality of raised hollow spikes communicating therewith, and the other end of the hollow spikes forms a second air outlet 43. One end of the heat collecting air distribution pipe 44 is connected to the bag breaking roller 42 through a second sealing component, and the other end is connected to the bellows 14. The heat collecting air distribution pipe 44 is provided with a plurality of raised hollow short tubes communicating therewith, and the other end of the hollow short tubes forms a first air outlet 45. High-pressure air enters the wind box 14 from the outlet of the high-pressure bag-breaking blower 13 and is distributed to several groups of heat-collecting air distribution pipes 44. The high-pressure air exchanges heat with the heat-collecting air distribution pipes 44 to form high-temperature and high-pressure air, which is ejected from the first air outlet 45 and the second air outlet 43 in turn. The reducer 41 drives the bag-breaking roller 42 to rotate, and the hollow spikes tear the bale of straw fuel. At the same time, the second air outlet 43 ejects high-temperature and high-pressure air, creating a high-temperature environment locally, making it easier to break up, dry, and burn the bale of straw fuel. The scattered and burned fuel naturally falls through the first air outlet 45 of the heat-collecting air distribution pipe 44, and then falls on the grate 5 after the high-temperature and high-pressure air is ejected again to assist combustion. The process of the bale of straw fuel from being broken up, dried, burned, to falling on the grate 5 occurs in the combustion chamber 3. The concrete in the combustion chamber 3 accumulates heat to create a high-temperature environment, which helps the fuel burn more fully. The burning fuel enters the boiler 6 through the fire outlet 16 and the connecting arch 17 along the grate 5. At the same time, the burnout fan 19 and the grate blower 21 continuously supply combustion-supporting air to completely burn the fuel. The high-temperature flue gas generated by the combustion exchanges heat with the water cooling system of the boiler 6 and enters the heat exchange cylinder 20 for heat exchange again before entering the dust collector 22 for dust removal. The flue gas that meets the standards is discharged to the outside through the induced draft fan 23 and the chimney 24 to complete the heat exchange. The controller controls the frequency of the feeding device 1, the bag breaking device 4, the high-pressure bag breaking blower 13, the grate blower 21, the burnout fan 19, the induced draft fan 23 and the grate reducer 15 in conjunction with the boiler furnace temperature to achieve dynamic and stable combustion.

[0026] The controller of this bale straw direct-fired boiler combustion control system is installed on the electric control cabinet. All sensors and motors are connected to the controller port through cables. The controller outputs signals according to the program based on the feedback data and detection signals, thereby completing the entire control. This bale straw direct-fired boiler combustion control system is controlled by PLC, and the process and various data are displayed intuitively, and the operation is simple and convenient.

[0027] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A combustion control system for a straw bale direct-fired boiler, characterized in that: It includes a grate (5) and a boiler (6) placed on the grate (5); A silo (2), the silo (2) being a full membrane wall structure, placed at the front end of the grate (5), and a silo negative pressure gauge (11) detection port being provided at the upper position of the silo (2); A feeding device (1), the feeding device (1) being connected to a silo opening (10) on one side of a silo (2), a dust cover (8) being provided at the connection, a high temperature resistant stainless steel sealing door (9) being provided inside the dust cover (8), and a quick lifting sealing door (7) being provided at the inlet of the dust cover (8); A combustion chamber (3), the combustion chamber (3) being a main combustion zone and being arranged at the lower end of the silo (2); a side wall of the combustion chamber (3) close to the boiler is provided with a fire outlet (16); the fire outlet (16) is connected to the boiler (6) via a connecting arch (17); a furnace temperature sensor (18) is provided on the boiler (6) close to the connecting arch (17); a bag breaking device (4), the bag breaking device (4) being arranged at an upper position in the combustion chamber (3) and at a certain height from the surface of the grate (5); a high-pressure bag-breaking blower (13), the high-pressure bag-breaking blower (13) being located below the bag-breaking device (4) and connected to a wind box (14); A grate reducer (15), the grate reducer (15) being arranged at one side of the front end of the grate (5); A burnout fan (19), the burnout fan (19) being arranged at the front end of the boiler (6) close to the combustion chamber (3) and below the furnace temperature sensor (18); a grate blower (21), the grate blower (21) being located at the end of the grate (5) and connected to the grate (5); It also comprises a heat exchange cylinder (20), a dust collector (22), an induced draft fan (23) and a chimney (24); the inlet smoke box of the heat exchange cylinder (20) is connected to the boiler (6); the outlet smoke box of the heat exchange cylinder (20) is connected to the smoke inlet of the dust collector (22); the smoke outlet of the dust collector (22) is connected to the air inlet of the induced draft fan (23); and the smoke outlet of the induced draft fan (23) is connected to the chimney (24).

2. The combustion control system for a straw bale direct-fired boiler according to claim 1, characterized in that: The fast lifting sealing door (7) and the high temperature resistant stainless steel sealing door (9) always keep one door in a closed state during the loading process, so as to control the air intake and maintain the boiler in a slightly negative pressure operation; The combustion control system of the bale straw direct-fired boiler is also provided with a controller, which is used to adjust the frequency of the blower and the induced draft fan by detecting the reading of the silo negative pressure gauge (11) when loading materials, so as to maintain the boiler running at a slight negative pressure.

3. The combustion control system for a straw bale direct-fired boiler according to claim 2, characterized in that: The controller is used to control the feeding frequency, the bag breaking device frequency, the grate reducer frequency, and the blower and induced draft fan frequency in a linked manner according to the feedback signal of the furnace temperature sensor (18), so as to achieve efficient and stable load output.

4. The combustion control system for a bale straw direct-fired boiler according to claim 1, characterized in that: The bag breaking device (4) is composed of a plurality of bag breaking units, each of which has a bag breaking roller (42) and a reducer (41). The rotation direction of the bag breaking roller (42) is controlled by controlling the reducer (41). The control mode is divided into a normal mode and a strong mode. When the program is set to the daily mode, all the bale breaking rollers (42) rotate to the left together, and then rotate to the right together after a certain interval, so that the bale of straw moves left and right on the bale breaking rollers (42), breaking while moving, so that the broken straw fuel falls onto the grate (5) more evenly; When the program is set to the strong mode, two adjacent bale breaking rollers (42) rotate in opposite directions, and then rotate in the opposite direction after a certain interval, so as to increase the disturbance of the bale straw and reduce the difficulty of breaking the bale.

5. The combustion control system for a straw bale direct-fired boiler according to claim 4 is characterized in that: The bag breaking unit further comprises a first sealing component, a second sealing component and a heat collecting air distribution pipe (44), wherein the bag breaking roller (42) is a hollow structure, and the outer surface of the bag breaking roller (42) is provided with a plurality of protruding hollow spikes communicating therewith, and the other end of the hollow spike forms a second air outlet (43); The outer surface of the heat collecting air distribution pipe (44) is provided with a plurality of protruding hollow short pipes communicating therewith, and the other end of the hollow short pipe forms a first air outlet (45); One end of the bag breaking roller (42) is connected to the reducer (41) via the first sealing component, and the other end is connected to the heat collecting air distribution pipe (44) in the maintenance space (12) outside the combustion chamber (3) via the second sealing component.

6. The combustion control system for a straw bale direct-fired boiler according to claim 5, characterized in that: The wind box (14) is arranged outside a side wall of the silo (2) away from the boiler (6) and is located below the reducer (41); One side of the wind box (14) is connected to the high-pressure bag breaking blower (13), and the opposite side is connected to one end of the heat collection air distribution pipe (44).

7. The combustion control system for a straw bale direct-fired boiler according to claim 1, characterized in that: The side wall of the combustion chamber (3) is a membrane wall structure wrapped in concrete, and the concrete has heat storage properties and is used to create a high-temperature environment.

8. The combustion control system for a straw bale direct-fired boiler according to claim 1, characterized in that: It also includes a loading device winch (25), a material pusher (26) and an observation hole (27); the loading device winch (25) is located below the loading device (1) and is driven by a steel wire rope to push the material pusher (26).

9. The combustion control system for a bale straw direct-fired boiler according to claim 1, characterized in that: The working principle of the combustion control system of the straw bale direct-fired boiler is as follows: the pusher (26) of the loading device (1) waits at the starting position for the grabbing machine to load the straw bale fuel. After the grabbing machine puts the straw bale fuel in place, the loading switch is started, and the hoist (25) of the loading device drags the pusher (26) forward through the wire rope to push the straw bale fuel. At the same time, the rapid lifting and sealing door (7) is opened, and when the pusher (26) and the straw bale fuel pass through, it falls down. The pusher (26) continues to push the straw bale fuel until the straw bale fuel pushes open the high-temperature resistant stainless steel sealing door (9), and the straw bale falls into the silo (2). The hoist (25) of the loading device reverses to drag the pusher (26) back. Similarly, the rapid lifting and sealing door (7) is opened and waits for the pusher (26) to completely pass through before falling down. The pusher (26) is dragged to the starting position and stops, and a single loading process is completed. The bale of straw fuel entering the silo (2) falls onto the bale breaking roller (42) of the bale breaking device (4), and the high-pressure air enters the wind box (14) from the outlet of the high-pressure bale breaking blower (13) and is distributed to a plurality of groups of heat collecting air distribution pipes (44). The high-pressure air exchanges heat with the heat collecting air distribution pipes (44) to form high-temperature and high-pressure air, which is ejected from the first and second air outlets in sequence; the speed reducer (41) drives the bale breaking roller (42) to rotate, and the hollow spikes tear the bale of straw fuel, and the second air outlet (43) ejects high-temperature and high-pressure air, creating a high-temperature environment locally, making it easier for the bale of straw fuel to be broken up, dried, and burned. The broken and burned fuel naturally falls down through the first air outlet (45) of the heat collecting air distribution pipe, and the high-temperature and high-pressure air is ejected again to assist After combustion, the fuel falls onto the grate (5), and the entire process occurs in the combustion chamber (3); the burned fuel follows the grate (5) through the fire outlet (16) and the connecting arch (17) into the boiler (6), and at the same time, the burnout fan (19) and the grate blower (21) continuously supply combustion-supporting air to completely burn the fuel; the high-temperature flue gas generated by the combustion exchanges heat with the water cooling system of the boiler (6) and enters the heat exchange cylinder (20) for further heat exchange and then enters the dust collector (22) for dust removal. The flue gas that meets the standards is discharged to the outside through the induced draft fan (23) and the chimney (24), completing the heat exchange; the controller controls the frequency of the feeding and bag breaking device (4), the induced draft fan and the grate reducer (15) in conjunction with each other according to the temperature of the boiler furnace to achieve dynamic and stable combustion.

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