An air supply system and method for a fluidized bed incinerator

Abstract

The present invention discloses an air supply system and method for a fluidized bed incinerator. The system includes: a fluidizing fan, whose air inlet side is respectively communicated with a second regulating air valve and a cooling air jacket of the incinerator, and whose air outlet side includes two branches. The first branch is communicated with a distributing air pipe of the incinerator through a heat exchanger, and the second branch is communicated with an auxiliary burner; a first switching valve is provided between the fluidizing fan and the auxiliary burner; a temperature regulating valve is provided between the fluidizing fan and the distributing air pipe; a heating burner is provided between the fluidizing fan and the distributing air pipe and is located on the pipeline between the heat exchanger and the distributing air pipe; a combustion-supporting fan is respectively communicated with the auxiliary burner and a starting burner; a second switching valve is provided between the combustion-supporting fan and the auxiliary burner; a third switching valve is provided between the combustion-supporting fan and the starting burner. The beneficial effects of the present invention are: reducing the number of fans required for the air supply system and lowering the idle rate of the fans; and realizing the regulation of the air temperature entering the fluidized bed incinerator by combining the use of valves.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection, and in particular, to an air supply system and method for a fluidized bed incinerator. Background Art

[0002] In the field of sludge treatment, the incineration method has gradually become an important technology for sludge treatment. The core equipment of the incineration method is a fluidized bed incinerator. In order to ensure complete combustion of sludge, sufficient air must be blown into the incinerator. On the one hand, it maintains the fluidized state of the sand bed in the furnace, and on the other hand, it provides the oxygen concentration necessary for sludge combustion to keep the operating conditions and load in the furnace stable. A stable and reliable air supply system is an important part of the fluidized bed incinerator system.

[0003] However, in the prior art, the following key technical problems have not been fundamentally solved:

[0004] First, there are many types of air supply and high air supply requirements for the fluidized bed incinerator, including furnace body cooling air, fluidization air, ignition burner combustion-supporting air, and auxiliary burner combustion-supporting air. If separate fans are set, it will increase the system investment cost, and the equipment idle rate is high after the stable operation of the incinerator, resulting in waste.

[0005] Second, the fluidization air provided by the fluidization fan is the main air supply source required for sludge incineration, with a large air volume and a certain inlet furnace temperature requirement. To maintain the heat load of the incinerator, the temperature of the fluidization air needs to be adjusted to adapt to the inlet furnace air temperature according to the seasonal operating conditions, while the prior art cannot adjust the inlet furnace air temperature. Summary of the Invention

[0006] To solve the problems of high fan idle rate and inability to adjust the inlet furnace air temperature, the purpose of the present invention is to provide an air supply system and method for a fluidized bed incinerator.

[0007] The present invention provides an air supply system for a fluidized bed incinerator, and the air supply system includes:

[0008] A fluidization fan, whose inlet side is respectively connected to a second regulating air valve and the cooling air jacket of the incinerator, and the outlet side of the fluidization fan includes two branches. Among them, the first branch passes through a heat exchanger and is connected to the air distribution pipe of the incinerator, and the second branch is connected to an auxiliary burner;

[0009] A first switching valve is provided between the fluidization fan and the auxiliary burner;

[0010] A temperature regulating valve is provided between the fluidization fan and the air distribution pipe, and the temperature regulating valve is arranged in parallel with the heat exchanger;

[0011] A heating burner is arranged between the heat exchanger and the air distribution pipe;

[0012] A combustion-supporting fan, which is respectively communicated with the auxiliary burner and the start-up burner;

[0013] A second switching valve is provided between the combustion-supporting fan and the auxiliary burner;

[0014] A third switching valve is provided between the combustion-supporting fan and the start-up burner.

[0015] As a further improvement of the present invention, a first regulating air valve is provided between the cooling air jacket and the fluidizing fan. The inlet end of the first regulating air valve is communicated with the highest point of the pipeline between the cooling air jacket and the fluidizing fan, and the outlet end of the first regulating air valve is communicated with the atmosphere.

[0016] As a further improvement of the present invention, a first flowmeter is provided between the fluidizing fan and the first switching valve, and a second flowmeter is provided between the fluidizing fan and the heat exchanger;

[0017] The second flowmeter is connected in series with the heat exchanger and is arranged in parallel with the temperature regulating valve.

[0018] As a further improvement of the present invention, the heat exchanger includes an air inlet, an air outlet, a flue gas inlet and a flue gas outlet;

[0019] The air inlet is connected to the second flowmeter, and the air outlet is connected to the temperature-rising burner;

[0020] The flue gas inlet is connected to the incinerator, and the flue gas outlet is connected to the subsequent flue gas purification equipment.

[0021] As a further improvement of the present invention, a thermometer and a pressure gauge are provided between the temperature-rising burner and the air distribution pipe for respectively monitoring the temperature and pressure of the air entering the air distribution pipe.

[0022] As a further improvement of the present invention, the cooling air jacket covers the outside of the incinerator, so that a hollow cavity is formed between the cooling air jacket and the incinerator;

[0023] An opening is provided at the bottom of the hollow cavity for air to enter, and an air outlet is provided at the upper end of the hollow cavity and is communicated with the air inlet side of the fluidizing fan.

[0024] The present invention also provides a method for supplying air to a fluidized bed incinerator, and the air supply method includes:

[0025] The cold air in the external environment and the heated air in the cooling air jacket converge in the fluidizing fan to obtain mixed air, and the mixed air is conveyed into the incinerator to provide oxygen for incineration and maintain the fluidized state of the fluidized sand bed. During this process, the ratio of the cold air to the heated air is adjusted by controlling the opening degree of the second regulating air valve to adjust the cooling effect of the cooling air jacket;

[0026] Before the mixed air enters the incinerator, it exchanges heat with the high-temperature flue gas in the heat exchanger to increase the temperature of the mixed air. The amount of the mixed air entering the heat exchanger is adjusted by controlling the opening degree of the temperature regulating valve, or the mixed air is heated by controlling the start of the temperature-rising burner to control the temperature of the mixed air entering the incinerator;

[0027] The cold air is respectively conveyed into the auxiliary burner and the start-up burner in the incinerator through the combustion-supporting fan. During the start-up stage of the furnace, the second switching valve is controlled to be shut off and the third switching valve is opened, and the cold air is conveyed into the start-up burner to provide oxygen; when the incinerator operates stably, the second switching valve is controlled to be opened and the third switching valve is shut off, and the cold air is conveyed into the auxiliary burner to provide oxygen.

[0028] As a further improvement of the present invention, the controlling the amount of the mixed air entering the heat exchanger by controlling the opening degree of the temperature regulating valve, or heating the mixed air by controlling the start of the temperature-rising burner to control the temperature of the mixed air entering the incinerator includes:

[0029] When the temperature regulating valve is in the shut-off state, the temperature of the mixed air entering the incinerator is monitored in real time by a thermometer. When the temperature is higher than the target temperature, the temperature regulating valve is interlocked to be opened and the opening degree is gradually increased to reduce the amount of the mixed air entering the heat exchanger, so that the temperature of the mixed air entering the incinerator is reduced, and the amount of the mixed air entering the heat exchanger is monitored by a second flowmeter;

[0030] When the temperature regulating valve is in the shut-off state, the temperature of the mixed air entering the incinerator is monitored in real time by a thermometer. When the temperature is lower than the target temperature, the temperature-rising burner is interlocked to start and the load is gradually increased to heat the mixed air to increase the temperature of the mixed air entering the incinerator.

[0031] As a further improvement of the present invention, the method further includes:

[0032] When the auxiliary burner and the start-up burner need to be turned on simultaneously, control the first switching valve to open, and convey the mixed air to the auxiliary burner through the fluidizing blower to supply oxygen. At the same time, control the second switching valve to close and the third switching valve to open, and convey the cold air to the start-up burner through the combustion-supporting blower to supply oxygen.

[0033] As a further improvement of the present invention, the method further includes:

[0034] During the furnace shutdown and cooling stage, turn off the fluidizing blower and the combustion-supporting blower, control the first regulating air valve to open, so that the heated air is discharged into the atmosphere, and the incinerator is naturally cooled down.

[0035] The present invention also provides a control method for the air supply system of a fluidized bed incinerator, and the control method includes:

[0036] After the incineration system is started, set the initial state of the air supply system: the opening degree of the first regulating air valve is 0%, the opening degree of the second regulating air valve is 30%, the first switching valve is closed, the second switching valve is closed, the third switching valve is open, and the opening degree of the temperature regulating valve is 0%. The control method controls the operation of the air supply system so that the temperature at the control point in the furnace of the incinerator is stably maintained at ≥850°C;

[0037] Among them, if the incineration system is started under a normal furnace start instruction, the control method includes the following steps:

[0038] Step 1: Give the "normal start instruction of the incineration system";

[0039] Step 2: The program judges whether all furnace start conditions are met. If so, proceed to the next step;

[0040] Step 3: Turn on the fluidizing blower;

[0041] Step 4: Turn on the start-up burner and the combustion-supporting blower;

[0042] Step 5: The program judges whether the temperature at the control point in the furnace of the incinerator is greater than or equal to 850°C. Wait until it is met and then proceed to the next step;

[0043] Step 6: The incineration system starts to feed and incinerate to the rated processing capacity;

[0044] Step 7: Turn off the start-up burner, turn off the combustion-supporting blower, and turn off the third switching valve;

[0045] Step 8: After a delay of t = 1 min, the program reads the fluidizing air temperature value T2 of the fluidizing blower, and at the same time inputs the calorific value of the incoming material into the incineration system, and the program automatically calculates the optimal fluidizing air operating condition temperature value T1 of the incinerator;

[0046] Step Nine: The program compares the value T1 with the value T2:

[0047] (1) If T2 = T1 ± 10°C, then proceed to Step Ten;

[0048] (2) If T2 > T1 + 10°C, then open the temperature control valve and gradually increase its opening degree. At the same time, the opening degree of the temperature control valve is in linkage with the value T2 for PID regulation until T2 = T1 ± 10°C is satisfied, and then proceed to Step Ten;

[0049] (3) If T2 < T1 - 10°C, then start the heating burner and gradually increase the combustion load. At the same time, the operating load of the heating burner is in linkage with the value T2 for PID regulation until T2 = T1 ± 10°C is satisfied, and then proceed to Step Ten;

[0050] Step Ten: The program determines whether the temperature at the control point in the incinerator furnace is greater than or equal to 850°C. If not, then start the auxiliary burner, start the combustion-supporting fan, open the second switching valve, and adjust the combustion load in linkage with the temperature at the furnace control point until the temperature at the furnace control point is stably maintained at ≥850°C;

[0051] If the incineration system is started under a rapid furnace start command, the control method includes the following steps:

[0052] Step One: Give the "rapid start command for the incineration system";

[0053] Step Two: The program determines whether all furnace start conditions are met. If so, then proceed to the next step;

[0054] Step Three: Start the fluidization fan;

[0055] Step Four: Open the first switching valve, start the start-up burner, and start the combustion-supporting fan;

[0056] Step Five: The program determines whether the temperature at the control point in the incinerator furnace is greater than or equal to 850°C until it is satisfied, and then proceed to the next step;

[0057] Step Six: The incineration system starts feeding and incinerating until the rated processing capacity is reached;

[0058] Step Seven: Turn off the start-up burner, turn off the auxiliary burner, turn off the combustion-supporting fan, and turn off the first switching valve;

[0059] Step Eight: After a delay of t = 1 min, the program reads the fluidization air temperature value T2 of the fluidization fan,

[0060] At the same time, input the calorific value of the incoming materials into the incineration system, and the program automatically calculates the optimal operating condition temperature value T1 of the fluidization air in the incinerator;

[0061] Step 9: The program compares the value T1 with the value T2:

[0062] (1) If T2 = T1 ± 10°C, then proceed to Step 10;

[0063] (2) If T2 > T1 + 10°C, then open the temperature control valve and gradually increase its opening degree. At the same time, the opening degree of the temperature control valve is linked with the value T2 for PID adjustment until T2 = T1 ± 10°C is satisfied, and then proceed to Step 10;

[0064] (3) If T2 < T1 - 10°C, then start the heating burner and gradually increase the combustion load. At the same time, the operating load of the heating burner is linked with the value T2 for PID adjustment until T2 = T1 ± 10°C is satisfied, and then proceed to Step 10;

[0065] Step 10: The program determines whether the temperature at the control point of the incinerator furnace chamber is greater than or equal to 850°C. If not, then start the auxiliary burner, start the combustion-supporting fan, open the second switching valve, and adjust the combustion load according to the temperature at the furnace chamber control point in a linked manner until the temperature at the furnace chamber control point is stably maintained at ≥ 850°C.

[0066] The beneficial effects of the present invention are as follows: By the combined use of the fluidization fan and the combustion-supporting fan, on the basis of meeting the supply of fluidization air and combustion-supporting air, the number of fans required for the air supply system is reduced, and the idle rate of the fans is lowered; at the same time, in combination with the use of valves, the adjustment of the inlet air temperature of the fluidized bed incinerator sand bed fluidization air is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0068] Figure 1 It is a schematic structural diagram of the air supply system of a fluidized bed incinerator according to an embodiment of the present invention;

[0069] Figure 2 It is a schematic flowchart of the air supply method of a fluidized bed incinerator according to an embodiment of the present invention;

[0070] Figure 3 It is a flowchart of the control method when the air supply system of a fluidized bed incinerator starts up normally according to an embodiment of the present invention;

[0071] Figure 4 It is a flowchart of the control method when the air supply system of a fluidized bed incinerator starts up quickly according to an embodiment of the present invention.

[0072] In the figure,

[0073] 1. Incinerator; 2. Cooling air jacket; 3. Auxiliary burner; 4. Ignition burner; 5. Fluidized sand bed; 6. Air distribution pipe; 7. First regulating air valve; 8. Second regulating air valve; 9. Fluidizing fan; 10. First flowmeter; 11. First switching valve; 12. Combustion-supporting fan; 13. Second switching valve; 14. Third switching valve; 15. Second flowmeter; 16. Heat exchanger; 17. Temperature regulating valve; 18. Heating-up burner; 19. Thermometer; 20. Pressure gauge. Specific embodiments

[0074] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0075] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0076] In addition, in the description of the present invention, the terms used are only for the purpose of illustration and are not intended to limit the scope of the present invention. The terms "including" and / or "comprising" are used to specify the existence of the described elements, steps, operations, and / or components, but do not exclude the existence or addition of one or more other elements, steps, operations, and / or components. The terms "first", "second", etc. may be used to describe various elements, do not represent an order, and do not limit these elements. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. These terms are only used to distinguish one element from another. In conjunction with the following drawings, these and / or other aspects become obvious, and those of ordinary skill in the art will more easily understand the description of the embodiments of the present invention. The drawings are only used to depict the embodiments of the present invention for the purpose of illustration. Those skilled in the art will easily recognize from the following description that alternative embodiments of the structure and method shown in the present invention can be adopted without departing from the principles described in the present invention.

[0077] A fluidized bed incinerator air supply system according to an embodiment of the present invention, the air supply system includes:

[0078] The fluidizing fan 9 has its air inlet side communicating with the second regulating air valve 8 and the cooling air jacket 2 of the incinerator 1 respectively. The cooling air jacket 2 covers the outside of the incinerator 1, forming a hollow cavity between the cooling air jacket 2 and the incinerator 1. An opening is provided at the bottom of the hollow cavity for air to enter, and an air outlet is arranged at the upper end of the hollow cavity and communicates with the air inlet side of the fluidizing fan 9;

[0079] The air outlet side of the fluidizing fan 9 includes two branches. Among them, the first branch passes through the heat exchanger 16 and communicates with the air distribution pipe 6 of the incinerator 1, and the second branch communicates with the auxiliary burner 3;

[0080] A first switching valve 11 is provided between the fluidizing fan 9 and the auxiliary burner 3;

[0081] A temperature regulating valve 17 is provided between the fluidizing fan 9 and the air distribution pipe 6, and the temperature regulating valve 17 is arranged in parallel with the heat exchanger 16;

[0082] A heating-up burner is provided between the fluidizing fan and the air distribution pipe, and the heating-up burner is located on the pipeline between the heat exchanger and the air distribution pipe;

[0083] The combustion-supporting fan 12 communicates with the auxiliary burner 3 and the starting burner 4 respectively;

[0084] A second switching valve 13 is provided between the combustion-supporting fan 12 and the auxiliary burner 3;

[0085] A third switching valve 14 is provided between the combustion-supporting fan 12 and the starting burner 4.

[0086] For example, such as Figure 1As shown, two cooling air jackets 2 are sleeved at a position 15 - 30 cm away from the outer surface of the incinerator 1, and a hollow cavity is formed between the two. An air inlet is provided at the lower end of the hollow cavity, and an air outlet is provided at the upper part of the hollow cavity. Cold air in the external environment continuously enters the cooling air jacket 2 through the air inlet and is discharged through the air outlet. The outer surface of the incinerator 1 is cooled by the air convection between the air inlet and the air outlet. Among them, the air inlet side of the fluidization blower 9 is connected to the air outlet of the hollow cavity through a pipeline. Under the action of the fluidization blower 9, the heated air in the cooling air jacket 2 is continuously extracted, accelerating the air convection in the cooling air jacket 2 and improving the cooling effect. At the same time, the air inlet side of the fluidization blower 9 is also connected to the outlet of the second regulating air valve 8 through a pipeline, and the inlet of the second regulating air valve 8 communicates with the external environment, enabling cold air in the external environment to enter the fluidization blower 9 through the second regulating air valve 8. By adjusting the opening degree of the second regulating air valve 8, the proportion of cold air and heated air can be adjusted, thereby realizing the adjustment of the cooling effect of the cooling air jacket 2. For example, when the opening degree of the second regulating air valve 8 is increased, the proportion of heated air entering the fluidization blower 9 is smaller, the air convection effect in the cooling air jacket 2 is reduced, and its cooling effect is weakened; when the opening degree of the second regulating air valve 8 is decreased, the proportion of heated air entering the fluidization blower 9 is increased, the air convection effect in the cooling air jacket 2 is enhanced, and its cooling effect is increased. Preferably, a temperature monitoring device is provided on the surface of the incinerator 1 and is interlocked with the second regulating air valve 8. According to the surface temperature of the incinerator 1 monitored in real time by the temperature monitoring device, the opening degree of the second regulating air valve 8 is synchronously adjusted through an interlock reaction, so that the temperature on the surface of the incinerator 1 meets the requirements.

[0087] In the fluidization blower 9, cold air in the external environment and heated air in the cooling air jacket 2 converge to obtain a mixed air. The mixed air is conveyed to the heat exchanger 16 under the action of the fluidization blower 9 for heat exchange with the high-temperature flue gas. The mixed air absorbs the heat of the high-temperature flue gas and its temperature rises, and the temperature of the high-temperature flue gas decreases accordingly. The mixed air with increased temperature is continuously conveyed to the air distribution pipe 6 inside the incinerator 1. On the one hand, it provides oxygen for the combustion of the sludge in the incinerator, and on the other hand, it keeps the fluidized sand bed 5 in a fluidized state all the time to ensure the full combustion of the sludge. The cooled flue gas is conveyed to the subsequent flue gas treatment equipment for subsequent treatment;

[0088] Method 1: By adjusting the opening degree of the temperature regulating valve 17, the amount of mixed air entering the heat exchanger 16 can be controlled, thereby controlling the temperature of the mixed air entering the incinerator 1. For example, increasing the opening degree of the temperature regulating valve 17 reduces the amount of mixed air entering the heat exchanger 16, and the remaining mixed air enters the incinerator 1 directly without passing through the heat exchanger 16, and finally the temperature of the mixed air entering the incinerator 1 decreases; reducing the opening degree of the temperature regulating valve 17 increases the amount of mixed air entering the heat exchanger 16, and the remaining mixed air enters the incinerator 1 directly without passing through the heat exchanger 16, and finally the temperature of the mixed air entering the incinerator 1 increases. During this process, the amount of mixed air entering the heat exchanger 16 can be monitored by the second flowmeter 15 to accurately adjust the temperature regulating valve 17;

[0089] Method 2: By adjusting the switch and combustion load of the heating burner 18, the temperature of the mixed air entering the incinerator 1 can be controlled. For example, turning on the heating burner 18 and increasing its combustion load raises the temperature of the mixed air entering the incinerator 1; reducing the combustion load of the heating burner 18 lowers the temperature of the mixed air entering the incinerator 1;

[0090] In the initial state, the temperature regulating valve 17 is in the closed state. If the reading of the thermometer 19 is too high at this time, then open the temperature regulating valve 17 to lower the temperature of the mixed air and perform accurate adjustment according to the above step 1. If the reading of the thermometer 19 is too low at this time, then turn on the heating burner 18 to raise the temperature of the mixed air and perform accurate adjustment according to the above step 2. Adjusting the temperature of the mixed air entering the incinerator 1 can improve the adaptability of the incinerator 1 to the sludge feeding amount, sludge calorific value, etc., avoid fluctuations in the furnace temperature, and improve the operating stability of the incinerator 1.

[0091] The auxiliary burner 3 and the start-up burner 4 are both arranged inside the incinerator 1. Among them, the start-up burner 4 is arranged below, and the auxiliary burner 3 is arranged above. The start-up burner 4 is inclined and arranged at a position above the fluidized sand bed 5. Its power (combustion load) is very large and is generally used in the start-up stage of the incinerator 1, that is, the incinerator 1 continuously heats up from normal temperature to 20°C and reaches 850°C at the smoke outlet (required by environmental protection standards). Only when it reaches 850°C can sludge be fed. The sludge is dried at high temperature inside the furnace, crushed by friction with the fluidized sand bed 5, and ignited by the flame. At this time, the ignited sludge can maintain combustion and release heat by virtue of its own calorific value. The start-up burner 4 is turned off, the sludge is continuously fed, and the incineration continues, and the furnace load remains stable. The auxiliary burner 3 is used in the stable combustion stage of the sludge. Due to environmental protection requirements, the outlet temperature of the incinerator 1 needs to reach 850°C when the sludge is fed and during operation. When the calorific value of the incoming sludge is low or fluctuates, the auxiliary burner 3 is interlocked with the furnace temperature. Once it is lower than 850°C, the auxiliary burner 3 is immediately interlocked and started. The auxiliary burner 3 adjusts its own combustion load according to the actual situation of the furnace temperature to keep the furnace temperature stable at the target value. When the incinerator 1 is in the start-up stage, the second switching valve 13 is controlled to open, and the third switching valve 14 is closed. The combustion blower 12 conveys the outside ambient air into the start-up burner 4 for heating up inside the furnace. When the incinerator 1 is in the operation stage and the furnace needs to be heated up, the second switching valve 13 is controlled to close, and the third switching valve 14 is opened. The combustion blower 12 conveys the outside ambient air into the auxiliary burner 3 for heating up inside the furnace. Preferably, the amount of air entering the auxiliary burner 3 or the start-up burner 4 can be controlled by the operating frequency of the combustion blower 12.

[0092] When the calorific value of the sludge coming into the incinerator 1 is too low and exceeds the fluctuation range of the normal operating conditions, the auxiliary burner 3 cannot maintain 850°C by its own ability, and the start-up burner 4 needs to be started to supplement heat, and at the same time, the auxiliary combustion is used for adjustment. Or, when the incinerator 1 is in the start-up stage, in order to increase the heating rate of the incinerator 1, the start-up burner 4 and the auxiliary burner 3 need to be started simultaneously to achieve the purpose of rapid heating in a short time. The first switching valve 11 can be controlled to open, the second switching valve 13 can be closed, and the third switching valve 14 can be opened, so that the fluidizing blower 9 provides the oxygen required for combustion for the auxiliary burner 3, and the combustion blower 12 provides the oxygen required for combustion for the start-up burner 4.

[0093] An optional implementation manner is that a first regulating air valve 7 is provided between the cooling air jacket 2 and the fluidizing fan 9. The inlet end of the first regulating air valve 7 is communicated with the highest point of the pipeline between the cooling air jacket 2 and the fluidizing fan 9, and the outlet end of the first regulating air valve 7 is communicated with the atmosphere. When the incinerator 1 is in the stage of shutting down and cooling down, the fluidizing fan 9 and the second regulating air valve 8 are closed, and the first regulating air valve 7 is controlled to open, so that the cooling air jacket 2 is communicated with the external ambient atmosphere. Under the action of natural convection, the heated air in the cooling air jacket 2 is discharged into the atmosphere, and the incinerator 1 is cooled down naturally.

[0094] An optional implementation manner is that a first flowmeter 10 is provided between the fluidizing fan 9 and the first switching valve 11, and a second flowmeter 15 is provided between the fluidizing fan 9 and the heat exchanger 16;

[0095] The second flowmeter 15 is connected in series with the heat exchanger 16 and arranged in parallel with the temperature regulating valve 17.

[0096] The first flowmeter 10 is used to monitor the total amount of the mixed air flowing through the fluidizing fan 9, and the second flowmeter 15 is used to monitor the amount of the mixed air entering the heat exchanger 16. When the first switching valve 11 is in the closed state, through the monitoring results of the first flowmeter 10 and the second flowmeter 15, the proportion of the mixed air delivered by the fluidizing fan 9 to the heat exchanger 16 and the temperature regulating valve 17 can be known.

[0097] An optional implementation manner is that the heat exchanger 16 includes an air inlet, an air outlet, a flue gas inlet and a flue gas outlet; the air inlet is connected with the second flowmeter 15, the air outlet is connected with the temperature-rising burner 18 and the air distribution pipe 6; the flue gas inlet is connected with the incinerator 1, and the flue gas outlet is connected with the subsequent flue gas purification equipment. The mixed air enters the heat exchanger 16 through the air inlet, exchanges heat with the high-temperature flue gas and is discharged from the heat exchanger 16 through the air outlet, and finally enters the air distribution pipe 6 through the pipeline. The high-temperature flue gas in the incinerator 1 enters the heat exchanger 16 through the flue gas inlet to exchange heat with the mixed air, and then is transported to the subsequent flue gas purification equipment through the flue gas outlet.

[0098] An optional implementation manner is that a thermometer 19 and a pressure gauge 20 are provided between the heat exchanger 16 and the air distribution pipe 6, and are used to monitor the temperature and pressure of the air entering the air distribution pipe 6 respectively. Preferably, the thermometer 19 is interlocked with the temperature regulating valve 17 and the temperature-rising burner 18. According to the temperature of the air entering the air distribution pipe 6 monitored by the thermometer 19, through the interlock reaction, the opening and opening degree of the temperature regulating valve 17 and the opening and combustion load of the temperature-rising burner 18 are adjusted in real time to ensure the stable operation of the incinerator 1.

[0099] As Figure 1 and 2As shown in the figure, a method for supplying air to a fluidized bed incinerator according to an embodiment of the present invention, the air supply method includes:

[0100] Cold air in the external environment and heated air in the cooling air jacket 2 converge in the fluidization blower 9 to obtain mixed air, and the mixed air is transported into the incinerator 1 to provide oxygen for incineration and maintain the fluidization state of the fluidized sand bed 5. During this process, the ratio of the cold air to the heated air is adjusted by controlling the opening degree of the second regulating air valve 8 to adjust the cooling effect of the cooling air jacket 2;

[0101] Before the mixed air enters the incinerator 1, it exchanges heat with the high-temperature flue gas in the heat exchanger 16 to increase the temperature of the mixed air. The amount of the mixed air entering the heat exchanger 16 is adjusted by controlling the opening degree of the temperature regulating valve 17, or the mixed air is heated by controlling the opening of the temperature-rising burner to control the temperature of the mixed air entering the incinerator 1;

[0102] The cold air is respectively transported into the auxiliary burner 3 and the start-up burner 4 in the incinerator 1 through the combustion-supporting blower 12. During the furnace-starting stage, the second switching valve 13 is controlled to be closed and the third switching valve 14 is opened, and the cold air is transported into the start-up burner 4 to provide oxygen; after the incinerator 1 operates stably, the second switching valve 13 is controlled to be opened and the third switching valve 14 is closed, and the cold air is transported into the auxiliary burner 3 to provide oxygen.

[0103] An optional implementation manner, the amount of the mixed air entering the heat exchanger 16 is adjusted by controlling the opening degree of the temperature regulating valve 17 to control the temperature of the mixed air entering the incinerator 1, and the temperature of the mixed air is further controlled by opening the temperature-rising burner 18, including:

[0104] The temperature regulating valve 17 is in the off state, and the temperature of the mixed air entering the incinerator 1 is monitored in real time through the thermometer 19. When the temperature is higher than the target temperature, the opening degree of the temperature regulating valve 17 is interlocked to increase, reducing the amount of the mixed air entering the heat exchanger 16, and the amount of the mixed air entering the heat exchanger 16 is monitored through the second flowmeter 15 to reduce the temperature of the mixed air entering the incinerator 1; when the temperature is lower than the target temperature, the temperature-rising burner 18 is interlocked to start and the load is gradually increased to heat the mixed air to increase its temperature.

[0105] An optional implementation manner, the method further includes:

[0106] When the auxiliary burner 3 and the start-up burner 4 need to be turned on simultaneously, control the first switching valve 11 to open, and convey the mixed air to the auxiliary burner 3 through the fluidization blower 9 to provide oxygen. At the same time, control the second switching valve 13 to close and the third switching valve 14 to open, and convey the cold air to the start-up burner 4 through the ignition blower 12 to provide oxygen.

[0107] An alternative embodiment, the method further includes:

[0108] During the furnace shutdown and cooling stage, turn off the fluidization blower 9 and the combustion-supporting blower 12, control the first regulating air valve 7 to open, so that the heated air is discharged into the atmosphere, and the incinerator 1 cools down naturally.

[0109] Taking a sludge incinerator as an example, the air supply method of the above fluidized bed incinerator is specifically described as follows:

[0110] During the furnace start-up stage of the incinerator 1, the start-up burner 4 operates, and the combustion-supporting blower 12 is turned on to provide the oxygen required for combustion support for the start-up burner 4; at the same time, the fluidization blower 9 is turned on to provide the oxygen required for sludge combustion in the incinerator 1 and start the fluidization of the fluidized sand bed 5. When the fluidization blower 9 is turned on, the value of the pressure gauge 20 will experience a process of rising from low to high and then suddenly decreasing. The moment of sudden decrease from high is judged as the successful fluidization of the fluidized sand bed 5 at the bottom of the incinerator 1.

[0111] When the incinerator 1 operates stably, the fluidization blower 9 supplies the oxygen required for sludge combustion to the incinerator 1 at a fixed frequency and fixed air volume, and maintains the fluidization state of the fluidized sand bed 5.

[0112] Keep the first regulating air valve 7 closed, set the initial opening of the second regulating air valve 8 to 50%, and control the outer surface temperature of the cooling air jacket 2 to be between 45 and 50 °C. When the temperature exceeds 50 °C, the opening of the second regulating air valve 8 is interlocked to decrease, strengthening the forced convection in the cooling air jacket 2 and improving its cooling effect on the incinerator 1; when the temperature is lower than 45 °C, the opening of the second regulating air valve 8 is interlocked to increase, weakening the forced convection in the cooling air jacket 2 and reducing its cooling effect on the incinerator 1. On the pipeline on the air outlet side of the fluidization blower 9, the first flowmeter 10 monitors the total air volume passing through the fluidization blower 9 to be approximately 23000 m 3 / h, and the pressure gauge 19 monitors the fluidization air pressure to be approximately 30 kPa. Under stable operating conditions, the values of both tend to be stable.

[0113] The heat exchanger 16 selects a 1.9 MW shell-and-tube heat exchanger. The temperature regulating valve 17 connected in parallel with it selects a specification of DN150 and is set to the initial state of being closed, that is, the opening is 0%; the heating-up burner 18 selects a 3.0 MW load-adjustable burner and is in the initial state of being closed, that is, the combustion load is 0%. When operating:

[0114] If the temperature shown by the thermometer 19 is higher than the fluidization air temperature of 450°C required for the incinerator 1, the temperature regulating valve 17 is opened. The opening degree of the temperature regulating valve 17 is interlocked with the real-time temperature data of the thermometer 19, and the opening degree of the temperature regulating valve 17 is gradually increased, reducing the air volume entering the heat exchanger 16 for heat exchange with the high-temperature flue gas until the temperature shown by the thermometer 19 continuously decreases and approaches the target value of 450°C and remains stable;

[0115] If the temperature shown by the thermometer 19 is lower than the fluidization air temperature of 450°C required for the incinerator 1, the heating combustion burner 18 is opened. The combustion load of the heating combustion burner 18 is interlocked with the real-time temperature of the thermometer 19, and the combustion load of the heating combustion burner 18 is gradually increased to heat the mixed air until the temperature shown by the thermometer 19 continuously rises and approaches the target value of 450°C and remains stable.

[0116] The optimal fluidization air temperature required for the incinerator 1 depends on the furnace heat load, and the furnace heat load is determined by the amount of sludge incinerated and the calorific value of the sludge. On the premise that the sludge feeding amount remains constant, when the calorific value of the sludge is low and the furnace heat load of the incinerator 1 decreases, the temperature of the mixed air entering the incinerator 1 should be increased; when the calorific value of the sludge is high and the furnace heat load of the incinerator 1 increases, the temperature of the mixed air entering the incinerator 1 should be appropriately decreased. Usually, when the temperature regulating valve 17 is closed and the heating combustion burner 18 operates at the maximum combustion load, the temperature of the mixed air entering the incinerator 1 reaches the highest value; however, closing the heating combustion burner 18 and fully opening the temperature regulating valve 17 is not the lowest operating condition point for the mixed air supply, because to ensure that there is enough heat exchange and cooling air volume inside the heat exchanger 16 to maintain its safe operation, the maximum opening degree of the temperature regulating valve 17 is 65%, and at this time, the temperature of the mixed air entering the incinerator 1 reaches the lowest value.

[0117] After the sludge treatment in the incinerator 1 is completed or during furnace shutdown for maintenance, the incinerator 1 enters the furnace shutdown and cooling stage. The auxiliary combustion burner 3 and the start-up combustion burner 4 both stop operating, the fluidization air blower 9 and the combustion-supporting air blower 12 are closed, the first regulating air valve 7 is opened, and the air in the cooling air jacket 2 flows upward under the action of natural convection and is discharged into the atmosphere through the first regulating air valve 7, so that the incinerator 1 cools down naturally.

[0118] As Figure 3 and Figure 4 shown, for a control method of the air supply system of the fluidized bed incinerator described in the embodiment of the present invention, the control method includes:

[0119] As Figure 3 shown, the control method of the air supply system during the normal start-up of the incinerator includes: after the incineration system is started, setting the initial state of the system: the opening degree of the first regulating air valve is 0%, the opening degree of the second regulating air valve is 30%, the first switching valve is closed, the second switching valve is closed, the third switching valve is opened, and the opening degree of the temperature regulating valve is 0%. The control method controls the operation of the air supply system to stably maintain the temperature at the control point of the incinerator furnace at ≥850°C;

[0120] Among them, if the incineration system is started under a normal furnace-starting instruction, which is usually issued when starting the furnace for the first time or restarting the furnace after a long-term shutdown,

[0121] Step 1: Give the "normal start instruction for the incineration system";

[0122] Step 2: The program determines whether all furnace-starting conditions are met. If so, proceed to the next step;

[0123] Step 3: Start the fluidization blower;

[0124] Step 4: Start the start-up burner and the combustion-supporting blower;

[0125] Step 5: The program determines whether the temperature at the control point of the incinerator furnace chamber is greater than or equal to 850 °C. Until it is satisfied, proceed to the next step;

[0126] Step 6: The incineration system starts to feed (sludge) for incineration until the rated processing capacity;

[0127] Step 7: Turn off the start-up burner, turn off the combustion-supporting blower, and turn off the third switching valve;

[0128] Step 8: After a delay of t = 1 min, the program reads the fluidization air temperature value T2 of the fluidization blower. At the same time, the calorific value of the incoming material is input into the incineration system, and the program automatically calculates the optimal fluidization air operating condition temperature value T1 of the incinerator;

[0129] Step 9: The program compares the value T1 with the value T2;

[0130] (1) If T2 = T1 ± 10 °C, proceed to Step 10;

[0131] (2) If T2 > T1 + 10 °C, open the temperature regulating valve and gradually increase the opening degree. At the same time, the opening degree of the temperature regulating valve is in linkage with the value T2 for PID regulation until T2 = T1 ± 10 °C is satisfied, and then proceed to Step 10;

[0132] (3) If T2 < T1 - 10 °C, start the heating-up burner and gradually increase the combustion load. At the same time, the operating load of the heating-up burner is in linkage with the value T2 for PID regulation until T2 = T1 ± 10 °C is satisfied, and then proceed to Step 10;

[0133] Step 10: The program determines whether the temperature at the control point of the incinerator furnace chamber is greater than or equal to 850 °C. If not, start the auxiliary burner, start the combustion-supporting blower, start the second switching valve, and adjust the combustion load according to the temperature at the control point of the furnace chamber until the temperature at the control point of the furnace chamber is stably maintained at ≥ 850 °C.

[0134] AsFigure 4 As shown, the control method for the air supply system during the rapid startup of the incinerator includes: after the incineration system starts, set the initial state of the system: the opening degree of the first regulating air valve is 0%, the opening degree of the second regulating air valve is 30%, the first switching valve is closed, the second switching valve is closed, the third switching valve is opened, and the opening degree of the temperature regulating valve is 0%. The control method controls the operation of the air supply system to stably maintain the temperature at the control point in the incinerator furnace at ≥850 °C;

[0135] Among them, if the incineration system starts under the rapid furnace startup instruction, usually when the system needs to start quickly, a rapid furnace startup instruction is issued;

[0136] Step 1: Give the "rapid startup instruction for the incineration system";

[0137] Step 2: The program judges whether all furnace startup conditions are met. If so, proceed to the next step;

[0138] Step 3: Start the fluidizing fan;

[0139] Step 4: Open the first switching valve, start the startup burner, and start the combustion-supporting fan;

[0140] Step 5: The program judges whether the temperature at the control point in the incinerator furnace is greater than or equal to 850 °C. Until it is satisfied, proceed to the next step;

[0141] Step 6: The incineration system starts to feed and incinerate until the rated processing capacity;

[0142] Step 7: Close the startup burner, close the auxiliary burner, close the combustion-supporting fan, and close the first switching valve;

[0143] Step 8: After a delay of t = 1 min, the program reads the fluidizing air temperature value T2 of the fluidizing fan,

[0144] At the same time, input the calorific value of the incoming material to the incineration system, and the program automatically calculates the optimal fluidizing air operating condition temperature value T1 of the incinerator;

[0145] Step 9: The program compares the value T1 with the value T2;

[0146] (1) If T2 = T1 ± 10 °C, then proceed to Step 10;

[0147] (2) If T2 > T1 + 10 °C, then open the temperature regulating valve and gradually increase the opening degree. At the same time, the opening degree of the temperature regulating valve is in linkage with the value T2 for PID adjustment until T2 = T1 ± 10 °C is satisfied, and then proceed to Step 10;

[0148] (3) If T2 < T1 - 10°C, then start the said heating burner and gradually increase the combustion load. At the same time, the operating load of the heating burner is interlocked with the value T2 for PID regulation until T2 = T1 ± 10°C is satisfied, and proceed to Step Ten;

[0149] Step Ten: The program determines whether the temperature at the control point in the incinerator furnace chamber meets or is greater than 850°C. If not, start the auxiliary burner, start the said combustion-supporting fan, start the said second switching valve, and interlock and regulate the combustion load according to the temperature at the furnace chamber control point until the temperature at the furnace chamber control point is stably maintained at ≥850°C.

[0150] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0151] In addition, those of ordinary skill in the art can understand that although some of the embodiments described herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0152] Those skilled in the art should understand that although the present invention has been described with reference to exemplary embodiments, various changes can be made and elements thereof can be replaced with equivalents without departing from the scope of the present invention. Additionally, many modifications can be made to adapt a particular situation or material to the teachings of the present invention without departing from the essential scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but the present invention will include all embodiments falling within the scope of the appended claims.

Claims

1. An air supply system for a fluidized bed incinerator, characterized in that: The air supply system comprises: A fluidizing fan, the air inlet side of which is respectively connected to the second regulating air valve and the cooling air jacket of the incinerator, and the air outlet side of the fluidizing fan includes two branches, wherein the first branch is connected to the air distribution pipe of the incinerator through a heat exchanger, and the second branch is connected to the auxiliary burner; A first switching valve is provided between the fluidizing fan and the auxiliary burner; A temperature regulating valve is provided between the fluidizing fan and the air distribution duct, and the temperature regulating valve is arranged in parallel with the heat exchanger; A temperature-raising burner, which is arranged between the heat exchanger and the air distribution pipe; A combustion-supporting fan, which is communicated with the auxiliary burner and the start-up burner respectively; A second switching valve is provided between the combustion-supporting fan and the auxiliary burner; A third switching valve is provided between the combustion-supporting fan and the starting burner; A first flow meter is provided between the fluidizing fan and the first switching valve, and a second flow meter is provided between the fluidizing fan and the heat exchanger; A first regulating air valve is provided between the cooling air jacket and the fluidizing fan, wherein an inlet end of the first regulating air valve is connected to the highest point of the pipeline between the cooling air jacket and the fluidizing fan, and an outlet end of the first regulating air valve is connected to the atmosphere; The second flow meter is connected in series with the heat exchanger and is arranged in parallel with the temperature regulating valve; the heat exchanger includes an air inlet, an air outlet, a flue gas inlet and a flue gas outlet; the air inlet is connected to the second flow meter, and the air outlet is connected to the temperature-raising burner; the flue gas inlet is connected to the incinerator, and the flue gas outlet is connected to the subsequent flue gas purification equipment; A thermometer and a pressure gauge are provided between the temperature-raising burner and the air distribution pipe, for respectively monitoring the temperature and pressure of the air entering the air distribution pipe; The cooling air jacket is arranged on the outside of the incinerator to form a hollow cavity between the cooling air jacket and the incinerator; an opening is arranged at the bottom of the hollow cavity for air to enter, and an air outlet is arranged at the upper end of the hollow cavity and is connected to the air inlet side of the fluidizing fan.

2. A method for supplying air to a fluidized bed incinerator, characterized in that: The air supply method comprises: The cold air in the external environment and the heated air in the cooling air jacket are combined in the fluidizing fan to obtain mixed air, which is transported to the incinerator to provide oxygen for incineration and maintain the fluidized state of the fluidized sand bed. In this process, the ratio of the cold air to the heated air is adjusted by controlling the opening of the second regulating air valve to adjust the cooling effect of the cooling air jacket; The mixed air exchanges heat with the high-temperature flue gas in the heat exchanger before entering the incinerator, so that the temperature of the mixed air is increased, and the amount of the mixed air entering the heat exchanger is adjusted by controlling the opening of the temperature regulating valve, or the mixed air is heated by controlling the opening of the temperature-raising burner, so as to control the temperature of the mixed air entering the incinerator; The cold air is respectively delivered to the auxiliary burner and the start-up burner in the incinerator through the combustion-supporting blower. When the incinerator is started, the second switching valve is controlled to be closed and the third switching valve is controlled to be opened, and the cold air is delivered to the start-up burner to provide oxygen; when the incinerator runs stably, the second switching valve is controlled to be opened and the third switching valve is controlled to be closed, and the cold air is delivered to the auxiliary burner to provide oxygen; When the auxiliary burner and the start-up burner need to be turned on at the same time, the first switching valve is controlled to be turned on, and the mixed air is delivered to the auxiliary burner through the fluidizing fan to provide oxygen; at the same time, the second switching valve is controlled to be closed and the third switching valve is controlled to be turned on, and the cold air is delivered to the start-up burner through the combustion-supporting fan to provide oxygen; The method of adjusting the amount of the mixed air entering the heat exchanger by controlling the opening of the thermostatic valve, or heating the mixed air by controlling the opening of the temperature-raising burner to control the temperature of the mixed air entering the incinerator, comprises: The thermostatic valve is in the off state, and the temperature of the mixed air entering the incinerator is monitored in real time by a thermometer. When the temperature is higher than the target temperature, the thermostatic valve is interlocked to open and gradually increase the opening, thereby reducing the amount of the mixed air entering the heat exchanger, thereby lowering the temperature of the mixed air entering the incinerator, and monitoring the amount of the mixed air entering the heat exchanger by a second flow meter; The temperature regulating valve is in the off state, and the temperature of the mixed air entering the incinerator is monitored in real time by a thermometer. When the temperature is lower than the target temperature, the interlock control temperature raising burner is started and the load is gradually increased to heat the mixed air so as to increase the temperature of the mixed air entering the incinerator.

3. The air supply method according to claim 2, characterized in that: The method further comprises: During the shutdown and cooling stage, the fluidizing fan and the combustion-supporting fan are turned off, and the first regulating air valve is controlled to open so that the heated air is discharged into the atmosphere, so that the incinerator is cooled naturally.

4. A method for controlling an air supply system of a fluidized bed incinerator, characterized in that: After the incineration system is started, the initial state of the air supply system is set: the first regulating air valve opening is 0%, the second regulating air valve opening is 30%, the first switching valve is closed, the second switching valve is closed, the third switching valve is opened, and the temperature regulating valve opening is 0%. The control method controls the operation of the air supply system so that the temperature of the incinerator furnace control point is stably maintained at ≥850°C; Wherein, if the incineration system is started under a normal furnace start-up instruction, the control method comprises the following steps: Step 1: Give the "normal start instruction of the incineration system"; Step 2: The program determines whether all the furnace start-up conditions are met, and if so, proceeds to the next step; Step 3: Turn on the fluidizing fan; Step 4: Start the burner and start the combustion-supporting fan; Step 5: The program determines whether the temperature of the incinerator furnace control point is greater than or equal to 850°C, and proceeds to the next step if it is satisfied; Step 6: The incineration system starts feeding and incinerating to a rated processing capacity; Step 7: Turn off the start-up burner, turn off the combustion-supporting fan, and close the third switching valve; Step 8: After a delay of t=1min, the program reads the fluidizing air temperature value T2 of the fluidizing fan, and simultaneously inputs the calorific value of the incoming material into the incineration system, and the program automatically calculates the optimal fluidizing air operating condition temperature value T1 of the incinerator; Step 9: The program compares value T1 with value T2: (1) If T2 = T1 ± 10 °C, proceed to step 10; (2) If T2>T1+10°C, the thermostatic valve is opened and the opening is gradually increased. At the same time, the opening of the thermostatic valve is linked to the value T2 for PID adjustment until T2=T1±10°C is satisfied, and step ten is performed; (3) If T2 is less than T1-10°C, the temperature-raising burner is turned on and the combustion load is gradually increased. At the same time, the temperature-raising burner operating load is linked to the value T2 for PID adjustment until T2=T1±10°C is satisfied, and step ten is performed; Step 10: The program determines whether the temperature of the furnace control point of the incinerator is greater than or equal to 850°C. If not, the auxiliary burner is turned on, the combustion-supporting fan is turned on, the second switching valve is turned on, and the combustion load is adjusted according to the furnace control point temperature until the furnace control point temperature is stably maintained at ≥850°C; If the incineration system is started under the quick start command, the control method comprises the following steps: Step 1: Give the "incineration system quick start instruction"; Step 2: The program determines whether all the furnace start-up conditions are met, and if so, proceeds to the next step; Step 3: Turn on the fluidizing fan; Step 4: Open the first switching valve, start the starter burner, and start the combustion-supporting fan; Step 5: The program determines whether the temperature of the incinerator furnace control point is greater than or equal to 850°C, and proceeds to the next step if it is satisfied; Step 6: The incineration system starts feeding and incinerating to the rated processing capacity; Step 7: Turn off the starting burner, turn off the auxiliary burner, turn off the combustion-supporting fan, and close the first switching valve; Step 8: After a delay of t=1 min, the program reads the fluidizing air temperature value T2 of the fluidizing fan. At the same time, the calorific value of the incoming materials is input into the incineration system, and the program automatically calculates the optimal fluidizing air operating condition temperature value T1 of the incinerator; Step 9: The program compares value T1 with value T2: (1) If T2 = T1 ± 10 °C, proceed to step 10; (2) If T2>T1+10°C, the thermostatic valve is opened and the opening is gradually increased. At the same time, the opening of the thermostatic valve is linked to the value T2 for PID adjustment until T2=T1±10°C is satisfied, and step ten is performed; (3) If T2 is less than T1-10°C, the temperature-raising burner is turned on and the combustion load is gradually increased. At the same time, the temperature-raising burner operating load is linked to the value T2 for PID adjustment until T2=T1±10°C is satisfied, and step ten is performed; Step 10: The program determines whether the temperature of the incinerator furnace control point meets the requirement of being greater than or equal to 850°C. If not, the auxiliary burner is turned on, the combustion-supporting fan is turned on, the second switching valve is turned on, and the combustion load is adjusted according to the furnace control point temperature until the furnace control point temperature is stably maintained at ≥850°C.

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