A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel

Abstract

The present invention relates to a double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel, comprising a straw powder storage bin, a sawdust powder storage bin, a central weighing stirring and conveying storage bin, an impeller feeder, a fuel conveying fan, an air distributor, a feeding shoe, a conveying pipeline under the kiln and a conveying pipeline on the kiln. The system of the present invention uses straw and sawdust to replace coal powder, coal gas, natural gas and other fuels to calcine lime, which not only reduces fuel costs but also protects the environment; the two fuels can be switched or mixed for use, and at the same time, the problem of uneven heating caused by the physical properties of straw powder and sawdust powder can be minimized, so that each burner can get a corresponding amount of fuel.

Description

Technical Field

[0001] The invention relates to the technical field of lime shaft kiln heating, in particular to a double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel. Background Art

[0002] Straw and wood waste are two types of waste produced in agricultural and industrial production. In the past, direct incineration was often used to treat these two types of waste. Since the incineration environment is mostly open-air, the combustion process is not controlled, and the large amount of flue gas generated by the combustion cannot be treated in time, a large amount of smoke, dust and sulfide will be directly discharged into the atmosphere to pollute the environment, and it will also waste resources.

[0003] The calorific value of different straws is 3000-3800 kcal / kg, and the calorific value of different sawdust is 4200-4500 kcal / kg. The calorific value per unit mass of the above two fuels is significantly lower than that of coal powder, coal gas, natural gas and other fuels, so the maximum temperature formed by combustion is relatively low. The temperature for industrial preparation of lime is much lower than that of cement production, sintering and other reactions, generally at 1100-1350℃, and the double-bore vertical kiln is the kiln type with the lowest fuel consumption among many kiln types. Therefore, it is feasible to use straw powder and sawdust powder as fuel and use a double-bore vertical kiln to prepare lime.

[0004] Compared with traditional fuels (such as pulverized coal, coal gas, and natural gas), using straw powder and sawdust powder as fuel has the following problems: 1) low unit calorific value; 2) it is difficult to achieve very fine particle size after crushing; 3) the moisture content of the fuel must be strictly controlled; 4) the source of straw is seasonal; 5) the fuel burning time is short; 6) the amount of smoke generated during the fuel combustion process is large.

[0005] Due to the change in fuel characteristics, the heating system of the lime kiln using straw powder and sawdust powder as fuel must be improved to achieve the following goals: 1) Ensure the quality of the produced lime (reduce the rate of raw burning and overburning); 2) Ensure the temperature and height of the burning zone; 3) The ratio of sawdust and straw can be changed at will to adapt to the problem of insufficient source of straw powder due to seasonal factors; 4) Ensure stable and safe operation of the equipment. Summary of the invention

[0006] The invention provides a double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel, using straw and sawdust instead of coal powder, coal gas, natural gas and other fuels to calcine lime, which not only reduces fuel costs but also protects the environment; the two fuels can be switched or mixed for use, and the problem of uneven heating caused by the physical properties of straw powder and sawdust powder can be reduced to the greatest extent, so that each burner can obtain a corresponding amount of fuel.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel, comprising a straw powder storage bin, a sawdust powder storage bin, a central weighing, stirring and conveying storage bin, an impeller feeder, a fuel conveying fan, an air distributor, a feeding shoe, a conveying pipeline under the kiln and a conveying pipeline above the kiln;

[0009] The top of the central weighing, stirring and conveying storage bin is provided with a straw feed port, a sawdust feed port and a pressure balance port, the discharge port of the straw powder storage bin is connected to the straw feed port via a straw powder discharge pipe, the discharge port of the sawdust powder storage bin is connected to the sawdust feed port via a sawdust powder discharge pipe, and the sawdust powder storage bin is further connected to the pressure balance port via a pressure balance pipe; an agitator is arranged inside the central weighing, stirring and conveying storage bin, and a plurality of discharge ports are arranged at the bottom, which are connected to corresponding conveying pipes under the bin via corresponding discharge pipes, and impeller feeders are respectively arranged on the conveying pipes under the bin;

[0010] The air outlet duct of the fuel delivery fan is connected to the air inlet end of the air distributor, and the air outlet end of the air distributor is provided with multiple air outlets connected to the corresponding multiple under-kiln delivery pipes; the under-bin delivery pipe is connected to the corresponding under-kiln delivery pipe through the feeding shoe, and the under-kiln delivery pipe is connected to the two-way distribution branch pipes through the corresponding two-way pipe valve 1; the double-chamber lime vertical kiln is provided with a 1# kiln chamber and a 2# kiln chamber, each of which is respectively provided with a central burner and a plurality of peripheral burners, and the peripheral burners form a group of 2; the two-way distribution branch pipes connected to one of the under-kiln delivery pipes are respectively connected to the central burner in the 1# kiln chamber and the central burner in the 2# kiln chamber; the two-way distribution branch pipes of the remaining under-kiln delivery pipes are respectively connected to the two-way fuel branch pipes through the corresponding two-way pipe valve 2; among the two-way fuel branch pipes, one is connected to a group of peripheral burners in the 1# kiln chamber, and the other is connected to a group of peripheral burners in the 2# kiln chamber.

[0011] A plurality of U-shaped grooves are arranged in the valve body of the impeller feeder to replace blades, and the impeller feeder is made of stainless steel.

[0012] The feeding boot consists of a feeding pipe, an air intake and feeding pipe and a blowing pipe; the top of the feeding pipe is connected to the discharge port of the conveying pipe under the bin; the feeding pipe is arranged on the conveying pipe under the kiln, one end of which is the air intake port and the other end is the air outlet port; the feeding pipe near the air intake port is connected to the feeding pipe near the feeding port through a blowing pipe.

[0013] The fuel delivery blower adopts a Roots blower; a main pipe pressure sensor is arranged on the air outlet duct connecting the fuel delivery blower and the air distributor.

[0014] A nitrogen inlet and an exhaust gas inlet are also provided on the top of the central weighing, stirring and conveying storage bin; the nitrogen inlet is connected to a nitrogen gas source via a nitrogen pipeline, and the exhaust gas inlet is connected to the kiln tail drying exhaust gas via a kiln tail drying exhaust gas pipeline; the nitrogen pipeline and the kiln tail drying exhaust gas pipeline are both provided with a semi-ball valve and an air-controlled semi-ball valve, wherein the air-controlled semi-ball valve is arranged close to the central weighing, stirring and conveying storage bin; the straw powder feeding pipeline, the sawdust powder feeding pipeline and the pressure balance pipeline are both provided with a semi-ball valve and an air-controlled semi-ball valve, wherein the air-controlled semi-ball valve is arranged close to the central weighing, stirring and conveying storage bin.

[0015] A compressed air ring pipe is arranged on the outer side of the bottom of the central weighing, stirring and conveying storage bin, one end of which is connected to a compressed air source, and the compressed air ring pipe is respectively connected to each material discharge pipe.

[0016] A conveying hose 1 and a conveying hose 2 are respectively arranged on the conveying pipeline under the kiln at both ends of the feeding shoe, wherein the conveying hose 1 is arranged close to the air distributor; a branch pressure sensor, a stop valve and a check valve are arranged in sequence on the conveying pipeline under the kiln between the air distributor and the conveying hose 1.

[0017] A gas-controlled stop valve is arranged on the distribution branch pipe downstream of the two-way pipe valve.

[0018] The central weighing, stirring and conveying storage bin is also provided with a weighing sensor, a pressure sensor and a temperature sensor.

[0019] A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel also includes a burner cooling air fan; the air outlet of the burner cooling air fan is connected to the 1# furnace and the 2# furnace through a burner cooling air pipeline.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) Using straw and sawdust to calcine lime instead of coal powder, coal gas, natural gas and other fuels not only reduces fuel costs but also protects the environment;

[0022] 2) Sawdust powder and straw powder share a central weighing, mixing, conveying and storage bin, which allows fuel switching without increasing costs, and can even be mixed;

[0023] 3) It can minimize the uneven heating problem caused by the physical characteristics of straw powder and sawdust powder, so that each burner can get the corresponding amount of fuel;

[0024] 4) The system structure is simple and compact, easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1The invention discloses a structural schematic diagram of a double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel.

[0026] Figure 2 It is a structural schematic diagram of the feeding shoe of the present invention.

[0027] Figure 3 This is the layout diagram of the burner in the 1# kiln chamber described in the present invention.

[0028] Figure 4 This is the layout diagram of the burner in the 2# kiln chamber described in the present invention.

[0029] Figure 5 It is a schematic diagram of the connection between the burner cooling air blower of the present invention and the 1# furnace and the 2# furnace.

[0030] In the figure: 1. Fuel delivery fan 2. Main pipe pressure sensor 3. Air distributor 4. Branch pipe pressure sensor 5. Stop valve 6. Delivery hose 1 7. Feeding shoe 71. Feeding pipe 72. Intake feeding pipe 73. Blowing pipe 8. Delivery hose 2 9. Impeller feeder 10. Feeding pipe 11. Compressed air ring pipe 12. Weighing sensor 13. Pressure sensor 14. Agitator 15. Air-controlled semi-ball valve 16. Semi-ball valve 17. Straw powder storage bin 18. Sawdust powder storage bin 19. Nitrogen gas source 20. Kiln tail drying exhaust gas 21. Center weighing agitator Mixing and conveying storage bin 22. Compressed air source 23. Two-way pipe valve 1 24. Air control stop valve 25. Two-way pipe valve 2 26. 2# kiln chamber 27. 2# kiln chamber burner 28. 1# kiln chamber 29. 1# kiln chamber burner 30. Burner cooling air duct 31. Burner cooling air fan 32. Under-bin conveying pipeline 33. Under-kiln conveying pipeline 34. Kiln conveying pipeline 35. Kiln tail drying exhaust gas pipeline 36. Nitrogen pipeline 37. Pressure balance pipeline 38. Sawdust powder feeding pipeline 39. Straw powder feeding pipeline 40. Check valve 41. Temperature sensor DETAILED DESCRIPTION

[0031] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0032] like Figure 1 As shown, the double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel of the present invention comprises a straw powder storage bin 17, a sawdust powder storage bin 18, a central weighing stirring and conveying storage bin 21, an impeller feeder 9, a fuel conveying fan 1, an air distributor 3, a feeding shoe 7, a conveying pipeline 33 under the kiln and a conveying pipeline 34 above the kiln;

[0033] The top of the central weighing, stirring and conveying storage bin 21 is provided with a straw feed port, a sawdust feed port and a pressure balance port, the discharge port of the straw powder storage bin 17 is connected to the straw feed port via a straw powder discharge pipe 39, the discharge port of the sawdust powder storage bin 18 is connected to the sawdust feed port via a sawdust powder discharge pipe 38, and the sawdust powder storage bin 18 is further connected to the pressure balance port via a pressure balance pipe 37; the central weighing, stirring and conveying storage bin 21 is provided with a stirrer 14, and a plurality of discharge ports are provided at the bottom, which are connected to the corresponding storage lower conveying pipes 32 via corresponding discharge pipes 10, and the storage lower conveying pipes 32 are respectively provided with impeller feeders 9;

[0034] The air outlet duct of the fuel delivery fan 1 is connected to the air inlet end of the air distributor 3, and the air outlet end of the air distributor 3 is provided with multiple air outlets connected to the corresponding multiple kiln conveying pipes 33; the warehouse conveying pipe 32 is connected to the corresponding kiln conveying pipe 33 through the feeding shoe 7, and the kiln conveying pipe 33 is connected to the two-way distribution branch pipe through the corresponding two-way pipe valve 23; the double-chamber lime vertical kiln is provided with a 1# kiln chamber 28 and a 2# kiln chamber 26, such as Figure 3 , Figure 4 As shown, each kiln chamber is provided with a central burner and a plurality of peripheral burners, and each peripheral burner forms a group of two; the two-way distribution branch pipes connected to one of the under-kiln delivery pipelines 33 are respectively connected to the central burner in the 1# kiln chamber 28 and the central burner in the 2# kiln chamber 26; the two-way distribution branch pipes of the remaining under-kiln delivery pipelines 33 are respectively connected to the two-way fuel branch pipes through the corresponding two-way pipe valve 25; among the two-way fuel branch pipes, one is connected to a group of peripheral burners in the 1# kiln chamber 28, and the other is connected to a group of peripheral burners in the 2# kiln chamber 26.

[0035] The valve body of the impeller feeder 9 is provided with a plurality of U-shaped grooves instead of blades, and the impeller feeder 9 is made of stainless steel.

[0036] like Figure 2 As shown, the feeding boot 7 is composed of a feed tube 71, an air intake and conveying pipe 72 and a blowing pipe 73; the top end of the feed tube 71 is connected to the discharge port of the conveying pipe 32 under the bin; the air intake and conveying pipe 72 is arranged on the conveying pipe 33 under the kiln, one end of which is the air intake port and the other end is the air outlet and discharge port; the air intake and conveying pipe 72 near the air intake port is connected to the feed tube 71 near the feed outlet through the blowing pipe 73.

[0037] The fuel delivery blower 1 is a Roots blower; a main pipe pressure sensor 2 is provided on the air outlet duct connecting the fuel delivery blower 1 and the air distributor 3.

[0038] A nitrogen inlet and an exhaust gas inlet are also provided on the top of the central weighing, stirring and conveying storage bin 21; the nitrogen inlet is connected to the nitrogen gas source 19 through a nitrogen pipeline 36, and the exhaust gas inlet is connected to the kiln tail drying exhaust gas 20 through a kiln tail drying exhaust gas pipeline 35; the nitrogen pipeline 36 and the kiln tail drying exhaust gas pipeline 35 are both provided with a semi-ball valve 16 and an air-controlled semi-ball valve 15, wherein the air-controlled semi-ball valve 15 is arranged close to the central weighing, stirring and conveying storage bin 21; the straw powder feeding pipeline 39, the sawdust powder feeding pipeline 38, and the pressure balance pipeline 37 are both provided with a semi-ball valve 16 and an air-controlled semi-ball valve 15, wherein the air-controlled semi-ball valve 15 is arranged close to the central weighing, stirring and conveying storage bin 21.

[0039] A compressed air annular pipe 11 is provided on the outer side of the bottom of the central weighing, stirring and conveying storage bin 21 , one end of the compressed air annular pipe 11 is connected to a compressed air source 22 , and the compressed air annular pipe 11 is connected to each material discharge pipe 10 .

[0040] A conveying hose 1 6 and a conveying hose 2 8 are respectively arranged on the under-kiln conveying pipeline 22 at both ends of the feeding shoe 7, wherein the conveying hose 1 6 is arranged close to the air distributor 3; a branch pressure sensor 4, a stop valve 5 and a check valve 40 are arranged in sequence on the under-kiln conveying pipeline 33 between the air distributor 3 and the conveying hose 1 6.

[0041] A gas-controlled stop valve 24 is provided on the distribution branch pipe downstream of the two-way pipe valve 1 23 .

[0042] The central weighing, stirring and conveying storage bin 21 is also provided with a weighing sensor 12 , a pressure sensor 13 and a temperature sensor 41 .

[0043] like Figure 5 As shown, a double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel also includes a burner cooling air fan 31; the air outlet of the burner cooling air fan 31 is connected to the 1# furnace 28 and the 2# furnace 26 through the burner cooling air duct 30.

[0044] The double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel is provided with two fuel storage bins, namely straw powder storage bin 17 and sawdust powder storage bin 18. The sawdust and straw are crushed to a specified particle size and then loaded into the corresponding storage bins. Since the particle sizes of the two fuels are close and their physical properties are similar, they can be loaded and transported using the same central weighing, stirring and transporting storage bin 21. The two fuels can be switched or mixed.

[0045] Since the acquisition of straw is seasonal, the central weighing, stirring and conveying storage bin 21 is connected to the wood chip powder bin through a pressure balancing pipe 37 to balance the pressure in the central weighing, stirring and conveying storage bin 21.

[0046] Straw powder and sawdust powder (hereinafter collectively referred to as fuel) start from the straw powder storage bin 17 and sawdust powder storage bin 18 respectively, and enter the central weighing, stirring and conveying storage bin 21 through the sawdust powder discharge pipe 38 and the straw powder discharge pipe 39 by pneumatic conveying. After the fuel is stirred and leveled by the stirrer 14 provided in the central weighing, stirring and conveying storage bin 21, it flows downstream into the discharge pipe 10. The fuel at the discharge pipe 10 is dense and easy to be fluffed, so a compressed air blowing device is provided there. Compressed air starts from the compressed air source 22, is introduced into the compressed air ring pipe 11, and enters the discharge pipe 10 through the connecting hose, and is continuously blown to prevent the discharge pipe 10 from being fluffed. The lower end of the discharge pipe 10 is directly connected to the impeller feeder 9. The impeller feeder 9 plays the role of sealing and quantitative discharge. The valve core of the impeller feeder 9 adopts a U-shaped groove structure and is made of stainless steel. The capacity of the U-shaped groove is set according to the material delivery rate. This structure can ensure that sufficient wood chip powder and straw powder enter the kiln conveying pipeline 33 without causing fuel adhesion on the groove or empty groove.

[0047] According to the physical properties of the fuel, the number of impeller feeders 9 used in the present invention matches the number of conveying pipes 33 under the kiln, which are [(number of burners - 1) ÷ 2] + 1 (for example, the number of impeller feeders is 17, and the corresponding number of burners is 33). In the 1# kiln chamber and the 2# kiln chamber, except for the central burner, the other peripheral burners are grouped in pairs, corresponding to one impeller feeder 9. The reason is that the particle size of straw powder and sawdust powder is larger than that of coal powder, and the particle size range control is also wider than that of coal powder. Therefore, according to the traditional equal pressure principle, that is, the main pipe and the branch pipe automatically divide and distribute the materials according to the pressure, it is easy to cause segregation and blockage. The above arrangement enables fuels of different particle sizes to be supplied to each burner in quantity.

[0048] The downstream of the impeller feeder 9 is connected to the feeding shoe 7. Due to the physical properties of the fuel, a blowing pipe 73 is added to the end of the feeding shoe 7 near the air inlet to change the direction of part of the air flow to flush the U-shaped groove of the impeller feeder 9 to prevent the powder from sticking to the groove and not falling off. The fuel enters the conveying pipe 33 under the kiln from the feeding shoe 7.

[0049] The fuel delivery fan 1 adopts a Roots blower, which can ensure that the delivery air pressure remains unchanged when the flow rate changes. The air of the fuel delivery fan 1 is sent to the air distributor 3 through the main pipe pressure sensor 2, and the main pipe pressure sensor 2 is used to measure the working condition of the fuel delivery fan 1. The air distributor 3 is used to balance the pressure, and at the same time, the pressure and flow rate of the central burner are controlled by adjusting the outlet size, thereby controlling the fuel ratio obtained by the central burner and other peripheral burners.

[0050] The gas enters the conveying pipeline 32 under the conveying storage bin through the branch pressure sensor 4, the stop valve 5, the check valve 40, and the conveying hose 1 6. After carrying the fuel at the feeding shoe 7, the gas enters the conveying pipeline 33 under the kiln through the conveying hose 2 8. The pressure sensor 4 is used to monitor whether each conveying pipeline is blocked. The stop valve 5 is used to close the pipeline during maintenance. The check valve 40 prevents the fuel from flowing into the intake pipe and the air distributor 3 in the fault state. The conveying hose 1 6 and the conveying hose 2 8 are used to disconnect the hard connection between the central weighing and stirring conveying storage bin 21 and the conveying pipeline 33 under the kiln so that the weighing sensor 12 can weigh.

[0051] The fuel enters the distribution section from the kiln conveying pipeline 33, and first enters the two-way pipe valve 1 23 and the gas-controlled stop valve 24 to form the kiln chamber control pipeline. The gas-controlled stop valve 24 is divided into two groups, one group of valves is actuated to supply heat to the 1# kiln chamber 28. The other group of valves is actuated to supply heat to the 2# kiln chamber 26. The fuel continues to enter the two-way pipe valve 2 25, so that one pipeline corresponds to two burners. The fuel enters the kiln conveying pipeline 34 through the two-way pipe valve 2 25, and then enters the 1# kiln chamber burner 29 or the 2# kiln chamber burner 27, completing the fuel conveying process.

[0052] A burner cooling air fan 31 is provided, and cooling air is introduced into the No. 1 kiln chamber 28 and the No. 2 kiln chamber 26 through a burner cooling air duct 32 to cool the burner.

[0053] When the temperature sensor 41 on the central weighing, stirring and conveying storage bin 21 detects a significant temperature rise in the bin or exceeds the specified temperature, an alarm is sounded, at which time the nitrogen gas source 19 valve is opened to convey nitrogen to the central weighing, stirring and conveying storage bin 21 through the nitrogen pipeline 36, thereby playing a safety protection role.

[0054] The pressure sensor 13 is used to detect the pressure of the central weighing, stirring and conveying storage bin 21 to ensure that there is a slight negative pressure in the central weighing, stirring and conveying storage bin 21 .

[0055] During the operation of the system, a certain amount of fuel will be stored in the central weighing, mixing and conveying storage bin 21. If it is not used for a period of time, it will easily absorb water and become damp. At this time, a certain amount of kiln tail drying exhaust gas 20 is introduced to dry the fuel, and the material unloading work can be carried out after the drying is completed.

[0056] All pipelines for feeding materials and supplying gas to the central weighing, mixing and conveying storage bin 21 are provided with gas-controlled semi-ball valves 15 and semi-ball valves 16 for controlling the opening and closing of corresponding pipelines.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel, characterized in that: It includes straw powder storage bin, wood chip powder storage bin, central weighing mixing and conveying storage bin, impeller feeder, fuel conveying fan, air distributor, feeding boots, under-kiln conveying pipeline and over-kiln conveying pipeline; A straw feed port, a sawdust feed port and a pressure balance port are arranged on the top of the central weighing, stirring and conveying storage bin; the discharge port of the straw powder storage bin is connected to the straw feed port via a straw powder discharge pipe, the discharge port of the sawdust powder storage bin is connected to the sawdust feed port via a sawdust powder discharge pipe, and the sawdust powder storage bin is also connected to the pressure balance port via a pressure balance pipe; an agitator is arranged in the central weighing, stirring and conveying storage bin, a plurality of discharge ports are arranged at the bottom, which are connected to the corresponding conveying pipes under the bin via corresponding discharge pipes, and impeller feeders are arranged on the conveying pipes under the bin respectively; a plurality of U-shaped grooves are arranged in the valve body of the impeller feeder instead of blades, and the impeller feeder is made of stainless steel; a compressed air ring pipe is arranged on the outer side of the bottom of the central weighing, stirring and conveying storage bin, one end of which is connected to a compressed air source, and the compressed air ring pipe is respectively connected to each discharge pipe; The air outlet duct of the fuel conveying fan is connected to the air inlet end of the air distributor, and the air outlet end of the air distributor is provided with multiple air outlets connected to the corresponding multiple under-kiln conveying pipes; the under-bin conveying pipe is connected to the corresponding under-kiln conveying pipe through a feeding boot, and the under-kiln conveying pipe is connected to the two-way distribution branch pipes through a corresponding two-way pipe valve 1; the feeding boot is composed of a discharge pipe, an air intake conveying pipe and a blow pipe; the top of the discharge pipe is connected with the discharge port of the under-bin conveying pipe; the air intake conveying pipe is arranged on the under-kiln conveying pipe, one end of which is an air inlet and the other end is an air outlet; the air intake conveying pipe near the air inlet is connected with the under-kiln conveying pipe near the discharge port through a blow pipe; a conveying hose 1 and a conveying hose 2 are respectively arranged on the under-kiln conveying pipe at both ends of the feeding boot, wherein the conveying hose 1 is arranged close to the air distributor; a branch pressure sensor, a stop valve and a check valve are arranged in sequence on the under-kiln conveying pipe between the air distributor and the conveying hose 1; The double-chamber lime vertical kiln is provided with a 1# kiln chamber and a 2# kiln chamber, each of which is provided with a central burner and a plurality of peripheral burners, and the peripheral burners form a group of two; the two-way distribution branch pipes connected to one of the under-kiln conveying pipelines are respectively connected to the central burner in the 1# kiln chamber and the central burner in the 2# kiln chamber; the two-way distribution branch pipes of the remaining under-kiln conveying pipelines are respectively connected to the two-way fuel branch pipes through the corresponding two-way pipe valve 2; among the two-way fuel branch pipes, one is connected to a group of peripheral burners in the 1# kiln chamber, and the other is connected to a group of peripheral burners in the 2# kiln chamber.

2. A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel according to claim 1, characterized in that: The fuel delivery blower adopts a Roots blower; a main pipe pressure sensor is arranged on the air outlet duct connecting the fuel delivery blower and the air distributor.

3. A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel according to claim 1, characterized in that: A nitrogen inlet and an exhaust gas inlet are also provided on the top of the central weighing, stirring and conveying storage bin; the nitrogen inlet is connected to a nitrogen gas source via a nitrogen pipeline, and the exhaust gas inlet is connected to the kiln tail drying exhaust gas via a kiln tail drying exhaust gas pipeline; the nitrogen pipeline and the kiln tail drying exhaust gas pipeline are both provided with a semi-ball valve and an air-controlled semi-ball valve, wherein the air-controlled semi-ball valve is arranged close to the central weighing, stirring and conveying storage bin; the straw powder feeding pipeline, the sawdust powder feeding pipeline and the pressure balance pipeline are both provided with a semi-ball valve and an air-controlled semi-ball valve, wherein the air-controlled semi-ball valve is arranged close to the central weighing, stirring and conveying storage bin.

4. A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel according to claim 1, characterized in that: A gas-controlled stop valve is arranged on the distribution branch pipe downstream of the two-way pipe valve.

5. A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel according to claim 1, characterized in that: The central weighing, stirring and conveying storage bin is also provided with a weighing sensor, a pressure sensor and a temperature sensor.

6. A double-chamber lime shaft kiln heating system using straw powder and sawdust powder as fuel according to claim 1, characterized in that: It also includes a burner cooling air fan; the air outlet of the burner cooling air fan is connected to the 1# furnace and the 2# furnace through the burner cooling air pipeline.

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