Combustion control system and combustion control method

Abstract

To provide a combustion control system and a combustion control method that do not require installation of a moisture concentration meter and is capable of stabilizing a combustion state in a simpler way.SOLUTION: A combustion control system calculates, using acquired operational process data, a theoretical combustion air volume for a combustion material at the time when the operational process data is acquired in real time; calculates an index indicating an amount of combustion heat based on the calculated theoretical combustion air volume; and controls a supply amount of combustion material and / or combustion air so that the calculated index indicating the amount of combustion heat becomes a target value.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a combustion control system and a combustion control method. [Background technology]

[0002] For example, in a combustion control system that burns materials such as biomass fuels and waste, the combustion state is prone to become unstable due to variations in the materials, such as inconsistent moisture and combustible composition, uneven shape, and unexpected fluctuations in supply amount.

[0003] In previous technology, in order to stabilize the combustion state, the boiler evaporation rate was measured and the supply of combustion material and combustion air was controlled so that the measured boiler evaporation rate remained constant. However, with this previous technology, the measured boiler evaporation rate had a large time constant and reflected the actual combustion state with a delay of several minutes. Therefore, when the variation in the combustion material became large, the supply control of combustion material and combustion air could not keep up with the fluctuations in the combustion state, resulting in an unstable combustion state.

[0004] To solve the above problems, the technologies described in Patent Documents 1 and 2 below have been devised. This technology measures the oxygen concentration, moisture concentration, and other factors in the exhaust gas at the combustion chamber outlet, calculates the calorific value of the combustion material based on the measured values ​​in real time, and calculates an estimated boiler evaporation rate based on the calculated calorific value of the combustion material, and controls the supply of the combustion material and combustion air using the calculated estimated boiler evaporation rate. With this technology, the estimated boiler evaporation rate follows the combustion state with little delay, so even when there is significant variation in the calorific value of the combustion material or the supply amount, it is possible to appropriately control the supply of the combustion material and combustion air with little response delay, thereby stabilizing the combustion state. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5996762 [Patent Document 2] Patent No. 6429911 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the technology described in the above patent document, data on the moisture concentration of the exhaust gas is used to calculate the estimated boiler evaporation amount, so it is necessary to install a moisture concentration meter. In addition, the formula for calculating the estimated boiler evaporation rate is complex, which can take a long time to set up and adjust. Furthermore, when calculating the estimated boiler evaporation amount, data on the weight of garbage thrown in by a crane is also used, for example, so there was a risk that the weight of garbage thrown in would not match the actual weight of the material supplied for combustion, causing the calculation results to deviate from the actual combustion state.

[0007] In view of the above circumstances, an object of the present invention is to provide a combustion control system and a combustion control method that can achieve stabilization of the combustion state in a simpler manner without requiring the installation of a moisture concentration meter. [Means for solving the problem]

[0008] The combustion control system of the present invention is characterized by comprising a control unit that uses acquired operating process data to calculate in real time the theoretical combustion air amount of the combustion material at the time the operating process data was acquired, calculates an index indicating the combustion heat amount based on the calculated theoretical combustion air amount, and controls the supply amount of the combustion material and / or the combustion air so that the calculated index indicating the combustion heat amount becomes a target value.

[0009] In the above configuration, the index indicating the amount of combustion heat may be a boiler evaporation amount calculated based on the theoretical amount of combustion air. In the above configuration, the index indicating the amount of combustion heat may be a boiler steam heat amount calculated based on the theoretical amount of combustion air. In the above configuration, the index indicating the amount of combustion heat may be a calculated value of boiler absorption heat calculated based on the theoretical amount of combustion air. In the above configuration, the amount of combustion air and the oxygen concentration of exhaust gas at the combustion chamber outlet may be used as the operating process data.

[0010] The combustion control method of the present invention is characterized in that it uses the acquired operating process data to calculate in real time the theoretical amount of combustion air for the combustion material at the time the operating process data is acquired, calculates an index indicating the amount of combustion heat based on the calculated theoretical amount of combustion air, and controls the amount of supply of the combustion material and / or the combustion air so that the calculated index indicating the amount of combustion heat reaches a target value. [Effects of the Invention]

[0011] In the present invention, moisture concentration data is not required to calculate an index indicating the amount of heat generated by combustion used to control the amount of fuel and / or combustion air supplied. This eliminates the need for a moisture concentration meter, thereby reducing the costs required for purchasing and installing measuring equipment. Furthermore, the calculation formula is simpler than in the past, reducing the time and effort required for setup and adjustment. Furthermore, because an index indicating the amount of heat generated by combustion based on the theoretical amount of combustion air is used, the system is less susceptible to disturbances than in the past, enabling more accurate combustion control. Therefore, according to the present invention, it is not necessary to install a moisture concentration meter, and stabilization of the combustion state can be achieved by a simpler method. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram illustrating a combustion facility in which a combustion control system and a combustion control method according to a first embodiment of the present invention are implemented. [Figure 2] FIG. 1 is a diagram showing the correlation between the theoretical combustion air amount and the boiler evaporation amount. [Figure 3]This shows a comparison between an example and a comparative example, and the upper figure shows an example of the relationship between the calculated boiler evaporation amount and the measured boiler evaporation amount in an example of embodiment 1, and the lower figure shows an example of the relationship between the estimated boiler evaporation amount and the measured boiler evaporation amount in a comparative example of conventional technology (technology described in patent documents). DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, several embodiments of the present invention will be described as examples. The scope of the present invention is not limited to the embodiments shown in this specification, and various modifications are possible within the scope of the present invention.

[0014] [Outline of the combustion facility] FIG. 1 shows a schematic diagram of a combustion facility 1 equipped with a combustion control system S according to embodiment 1. The combustion facility 1 is, for example, a waste incineration facility that mainly uses waste as a combustion material W. Examples of waste include municipal solid waste and industrial waste. In this embodiment, a stepped stoker furnace is shown.

[0015] The combustion facility 1 includes a hopper H into which the combustion material W is fed by a transport device such as a crane, a dust feeder 111 which is a combustion material supply section that sends out and supplies the combustion material W in the hopper H, a combustion device 112 which burns the combustion material W supplied from the dust feeder 111, a primary combustion chamber 10a and a secondary combustion chamber 10b which are spaces inside the furnace, etc.

[0016] The combustion furnace 10 is made up of a combustion device 112, a primary combustion chamber 10a, a secondary combustion chamber 10b, etc. The combustion furnace 10 is, for example, a stepped stoker furnace. The primary combustion chamber 10a is located at the bottom of the combustion furnace 10, and the secondary combustion chamber 10b is located at the top of the combustion furnace 10. A laser-type oxygen concentration meter S1 that measures oxygen concentration is installed at the outlet of the secondary combustion chamber 10b. The combustion facility 1 is equipped with a combustion air supply unit P that supplies combustion air into the combustion furnace 10.

[0017] The combustion air supply section P includes, for example, a forced draft fan P0 and a secondary air fan P1. The combustion air supply section P also includes, for example, a first air duct L0 and a second air duct L01. Flow meters are provided at various locations in the combustion air supply section P.

[0018] In the combustion furnace 10, the material for combustion W is supplied by the dust feeder 111, and the material for combustion W is combusted in the combustion device 112 using combustion air supplied from the forced draft fan P0. The amount of material for combustion W supplied to the combustion furnace 10 can be adjusted by, for example, adjusting the drive speed of the dust feeder 111 or the combustion device 112.

[0019] The combustion facility 1 includes a boiler 12 into which the combustion gas discharged from the combustion furnace 10 is introduced, an economizer 13 into which the combustion gas discharged from the boiler 12 is introduced, a bag filter 15 that collects dust from the combustion gas discharged from the economizer 13, and a chimney 16 that releases the combustion gas sent from the bag filter 15 into the atmosphere.

[0020] A first exhaust gas duct L1 extends from the economizer 13 and is connected to a bag filter 15. A second exhaust gas duct L2, which has an induced draft fan P2 installed midway, extends from the bag filter 15, and the exhaust gas from which dust has been removed by the bag filter 15 is sent to the chimney 16 through the second exhaust gas duct L2. A circulating exhaust gas duct L22 branches off from the second exhaust gas duct L2 at a location upstream of the induced draft fan P2. A recirculating gas blower P3 and a flow meter are installed in the circulating exhaust gas duct L22, and a portion of the exhaust gas from which dust has been removed is sent to the combustion furnace 10 as circulating exhaust gas through the circulating exhaust gas duct L22.

[0021] The combustion furnace 10 or the boiler 12 may be provided with a temperature measuring device for measuring the temperature of the combustion gas and a pressure measuring device for measuring the pressure.

[0022] The boiler 12 uses the combustion gas generated in the combustion furnace 10 to evaporate boiler feed water and generate steam. The steam is sent to a power generation unit (not shown).

[0023] [Combustion control system] 1, the combustion facility 1 is equipped with a combustion control system S for controlling combustion. The combustion control system S includes a control unit C1 for controlling the combustion of the material for combustion W, a memory unit 102 for storing various information, and the like.

[0024] The control unit C1 and the storage unit 102 may be configured with hardware such as one or more processors and a memory for storing programs, a control procedure program, etc. Also, the control unit C1 and the storage unit 102 may be configured with an information processing device, a dedicated circuit, etc.

[0025] In the combustion air supply unit P, the amount of primary combustion air sent from the forced draft fan P0, the amount of secondary combustion air sent from the secondary air fan P1, and the amount of circulating exhaust gas sent from the recirculation gas fan P3 are all measured in real time and sent to the control unit C1. The oxygen concentration of the exhaust gas at the combustion chamber outlet is also measured in real time by an oxygen concentration meter S1, and the data is stored in the memory unit 102 and sent to the control unit C1. Data on the measured temperature, pressure, and other internal information of the combustion furnace 10 is also stored in the memory unit 102 and sent to the control unit C1. Data on the amount of boiler evaporation generated is also stored in the memory unit 102. In other words, the control unit C1 of the combustion control system S acquires at least the amount of combustion air, the oxygen concentration of the exhaust gas at the combustion chamber outlet, and the amount of boiler evaporation as operating process data.

[0026] The control unit C1 calculates in real time the theoretical combustion air amount of the combustion material at the time of acquisition of the operation process data using the acquired operation process data, and controls the supply amount of the combustion material and / or combustion air so that an index indicating the combustion heat quantity based on the calculated theoretical combustion air amount reaches a target value. The supply amount of the combustion material W can be controlled by changing the drive speed of the dust feeder 111 and the combustion device 112.

[0027] In the first embodiment, the boiler evaporation amount is used as an index indicating the amount of combustion heat.

[0028] The control unit C1 includes a theoretical combustion air amount calculation unit 101a, a boiler evaporation amount calculation unit 101b, an operation amount control unit 101c, and the like.

[0029] The theoretical combustion air amount calculation unit 101a calculates the theoretical combustion air amount from the combustion air amount in the combustion furnace 10 and the oxygen concentration of the exhaust gas at the combustion chamber outlet.

[0030] The boiler evaporation amount calculation unit 101b uses the correlation between the theoretical combustion air amount in the combustion furnace 10 and the boiler evaporation amount (see FIG. 2) to calculate the boiler evaporation amount calculation value using the theoretical combustion air amount.

[0031] In this embodiment, the boiler evaporation amount calculation unit 101b of the control unit C1 calculates a boiler evaporation amount calculation value from the theoretical combustion air amount using a preset correlation between the theoretical combustion air amount and the boiler evaporation amount, and adjusts the supply amount of combustion air and / or the supply amount of combustion material W so that this boiler evaporation amount calculation value becomes equal to the target value of the boiler evaporation amount.

[0032] The operation amount control unit 101c of the control unit C1 adjusts the supply amount of the combustion material W by controlling at least one of the drive speeds of the dust feeder 111 and the combustion device 112. The operation amount control unit 101c of the control unit C1 also adjusts the supply amount of combustion air by controlling the combustion air supply unit P (forced draft fan P0, secondary air blower P1).

[0033] For example, if the calculated boiler evaporation amount is higher than the target boiler evaporation amount, it is advisable to reduce the amount of combustion air or to reduce the drive speed of the combustion device 112 and the dust feeder 111 to reduce the supply amount of the combustion material W. On the other hand, if the calculated boiler evaporation amount is lower than the target boiler evaporation amount, it is advisable to increase the amount of combustion air or to increase the drive speed of the combustion device 112 and the dust feeder 111 to increase the supply amount of the combustion material W.

[0034] An example of the combustion control system according to the first embodiment will be described in more detail below. First, the oxygen concentration and the amount of combustion air are detected as operational process data, and the theoretical amount of combustion air at the time of detection is calculated in real time. The theoretical combustion air amount can be calculated, for example, using the following formula. ■Air ratio λ=21 / (21-O2) (Formula 1) ■Theoretical combustion air volume A0=Σ n i=1 (A i ) / λ (Equation 2)

[0035] Here, "O 2」 is the oxygen concentration (%-dry). The oxygen concentration can be the actual measured value of the oxygen concentration meter S1. Note that this actual measured value is a value converted from a wet basis to a dry basis using the moisture concentration in the exhaust gas under the design conditions of the combustion facility 1. Also, "Σ n i=1 (A i ) is the total amount of combustion air actually supplied to the combustion furnace. This total may be, for example, the total amount of primary combustion air, the total amount of secondary combustion air, the equivalent air amount calculated according to the amount of oxygen in the recirculated gas, the amount of leaked air, etc. A fixed value for the amount of leaked air may also be used for each facility. The flow rates of the amount of primary combustion air, the amount of secondary combustion air, and the amount of circulated exhaust gas can be measured in real time using a flow meter or the like.

[0036] The calculated boiler evaporation amount is calculated in real time based on the calculated theoretical combustion air amount. The calculated boiler evaporation amount can be calculated, for example, using the following formula: ■ Boiler evaporation calculation value Q1x=f1(A0) (Equation 3-1)

[0037] FIG. 2 shows an example of the correlation between the theoretical combustion air volume and the boiler evaporation rate. By plotting the relationship between the theoretical combustion air volume and the boiler evaporation rate based on actual operating data for the target combustion facility 1, a certain relationship equation (for example, a linear function relationship equation) can be obtained. This relationship equation may be the same throughout the year, or multiple correlations may be calculated throughout the year so that multiple correlations can be selected according to the season. The correlation may also be updated at any time. It may also be configured to be able to respond to fluctuations in the quality of the collected waste.

[0038] The upper graph in Figure 3 shows the change over time of the calculated boiler evaporation amount (solid line) and the actually measured boiler evaporation amount (dashed line) in the example. The lower graph in Figure 3 shows the change over time of the estimated boiler evaporation amount (solid line) and the actually measured boiler evaporation amount (dashed line) in the comparative example using the technology described in the patent document.

[0039] The calculated boiler evaporation amount value calculated as described above has a lead of about 4 minutes over the actual measured boiler evaporation amount value, as shown in the upper diagram of Figure 3, which shows a lead that is almost the same as that of the technology (comparison example) described in the above patent document previously proposed by the applicant, as shown in the lower diagram of Figure 3. In other words, the calculated boiler evaporation amount value can be calculated without relying on a moisture concentration meter, yet follows fluctuations in the combustion state with little delay, just like the technology described in the above patent document.

[0040] (Example) An example according to the first embodiment will be described below. For example, the total amount of detected combustion air Σ n i=1 (A i ) is 25,000 (m 3 N / h) and the oxygen concentration O2 measured at that time is 4.2%. In this case, from equation 1, the air ratio λ is 21 / (21-4.2) = 1.25. And from equation 2, the theoretical combustion air amount A0 is 25,000 (m 3 N / h) / 1.25=20000(m 3Using this theoretical combustion air volume A0 and the correlation between the theoretical combustion air volume and boiler evaporation volume (Figure 2, Equation 3-1), the corresponding boiler evaporation volume is calculated to be 22 (t / h).

[0041] For example, if the target value of the boiler evaporation rate is 20 (t / h), the control unit C1 adjusts the supply rate of the combustion material W and the amount of combustion air to decrease so that the calculated value of the boiler evaporation rate approaches the target value of the boiler evaporation rate (becomes smaller). On the other hand, if the target value of the boiler evaporation rate is 24 (t / h), the control unit C1 adjusts the supply rate of the combustion material W and the amount of combustion air to increase so that the calculated value of the boiler evaporation rate approaches the target value of the boiler evaporation rate (becomes larger).

[0042] Below, several embodiments will be described that are partial modifications of embodiment 1. Each embodiment may be the same as embodiment 1 except for the portions described above, as long as no contradictions arise. (Embodiment 2) A second embodiment will be described below. In a combustion control system according to the second embodiment, a boiler steam calorific value is used as an index showing the amount of combustion heat. The combustion control system according to the second embodiment includes a control unit that adjusts the amount of combustion material W and / or combustion air supplied so that the calculated boiler steam calorific value is equal to a target value for the boiler steam calorific value.

[0043] The combustion control system S may include a boiler steam calorific value calculation unit that calculates a boiler steam calorific value calculation value using the theoretical combustion air amount.

[0044] The boiler steam calorific value calculation unit may calculate the boiler steam calorific value from the theoretical combustion air volume using a predetermined correlation between the theoretical combustion air volume and the boiler steam calorific value, or a correlation between the theoretical combustion air volume and the boiler steam calorific value based on actual operating data. The correlation between the theoretical combustion air volume and the boiler steam calorific value may be expressed, for example, by a linear function or another function.

[0045] The control unit C1 may control the amount of combustion air supplied to the combustion furnace and / or the amount of combustion material W supplied so that the boiler steam calorific value calculated by the boiler steam calorific value calculation unit is equal to the target value of the boiler steam calorific value.

[0046] The theoretical combustion air amount can be calculated in real time as in the first embodiment.

[0047] The boiler steam calorific value is one of the indicators of the amount of heat generated by combustion, and is calculated from the boiler evaporation rate and steam enthalpy (determined by the steam temperature and steam pressure). The boiler steam calorific value can be used for control in the same way as the boiler evaporation rate in the first embodiment, and when the steam temperature or steam pressure fluctuates, using the boiler steam calorific value is a more accurate indicator of the amount of heat generated by combustion.

[0048] Based on the theoretical combustion air volume, the boiler steam calorific value is calculated in real time. ■ Calculated boiler steam calorific value Q2x=f2(A0) (Equation 3-2)

[0049] The boiler steam calorific value calculation unit calculates a boiler steam calorific value from the theoretical combustion air volume calculated by the theoretical combustion air volume calculation unit 101a, using the correlation between the theoretical combustion air volume and the boiler steam calorific value. This boiler steam calorific value has precedence over the actual measured value of the boiler evaporation volume, similar to the boiler evaporation volume calculation value in the first embodiment.

[0050] The manipulated variable control unit 101c controls the supply amount of the material for combustion W and / or the supply amount of combustion air so that the calculated boiler steam calorific value is equal to the target value of the boiler steam calorific value. For example, if the calculated boiler steam calorific value is higher than the target value of the boiler steam calorific value, it is recommended to reduce the amount of combustion air or slow down the drive speeds of the combustion device 112 and the dust feeder 111 to reduce the supply amount of the material for combustion W. On the other hand, for example, if the calculated boiler steam calorific value is lower than the target value of the boiler steam calorific value, it is recommended to increase the amount of combustion air or speed up the drive speeds of the combustion device 112 and the dust feeder 111 to increase the supply amount of the material for combustion W.

[0051] (Embodiment 3) A third embodiment will be described below. In the combustion control system according to the third embodiment, the boiler absorption heat quantity is used as an index showing the amount of combustion heat. The combustion control system according to the third embodiment includes a control unit that controls the supply of the combustion material W and / or the combustion air so that the calculated value of the boiler absorption heat quantity is equal to the target value of the boiler absorption heat quantity.

[0052] The combustion control system S may include a boiler absorption heat amount calculation unit that calculates a boiler absorption heat amount calculation value using the theoretical combustion air amount.

[0053] The boiler absorption heat calculation unit may calculate the boiler absorption heat calculation value from the theoretical combustion air volume using a correlation between a predetermined theoretical combustion air volume and the boiler absorption heat volume, or a correlation between the theoretical combustion air volume and the boiler absorption heat volume based on actual operating data. The correlation between the theoretical combustion air volume and the boiler absorption heat volume may be expressed, for example, by a linear function or other function.

[0054] The control unit C1 may control the supply amount of combustion air to the combustion furnace and / or the supply rate of the combustion material W so that the calculated value of the boiler absorption heat obtained by the boiler absorption heat calculation unit becomes equal to the target value of the boiler absorption heat.

[0055] The theoretical combustion air amount can be calculated in real time as in the first embodiment.

[0056] Boiler absorption heat is one index of combustion heat quantity, and is calculated by subtracting the boiler feedwater heat quantity from the boiler steam heat quantity and the boiler blowdown water export heat quantity. The boiler steam heat quantity is calculated using the method of the second embodiment. The boiler blowdown water export heat quantity is calculated from the blowdown water volume and the blowdown water enthalpy (determined by the boiler drum pressure (saturation)). The boiler feedwater heat quantity is calculated from the boiler feedwater volume and the boiler feedwater enthalpy (determined by the feedwater temperature and feedwater pressure). The boiler absorption heat quantity can be used to control the boiler absorption heat quantity in the same way as the boiler evaporation quantity in the first embodiment. When the feedwater flow rate, feedwater temperature, feedwater pressure, blowdown water volume, and boiler drum pressure fluctuate in addition to fluctuations in steam temperature and steam pressure, using the boiler absorption heat quantity is a more accurate index of combustion heat quantity than the boiler evaporation quantity.

[0057] Based on the theoretical amount of combustion air, the boiler absorption heat amount is calculated in real time. The calculated boiler absorption heat amount can be calculated using, for example, the following formula. ■ Calculated boiler absorption heat amount Q3x=f3(A0) (Equation 3-3)

[0058] The boiler absorption heat calculation unit calculates a boiler absorption heat calculation value using the correlation from the theoretical combustion air volume calculated by the theoretical combustion air volume calculation unit 101a. This boiler absorption heat calculation value precedes the actual boiler evaporation volume, similar to the boiler evaporation volume calculation value in the first embodiment.

[0059] The manipulated variable control unit 101c controls the supply rate of the combustion material W and / or the supply amount of combustion air so that the calculated value of the boiler absorption heat quantity becomes equal to the target value of the boiler absorption heat quantity. For example, if the calculated value of the boiler absorption heat quantity is higher than the target value of the boiler absorption heat quantity, it is recommended to reduce the amount of combustion air or slow down the drive speeds of the combustion device 112 and the dust feeder 111 to reduce the supply amount of the combustion material W. On the other hand, for example, if the calculated value of the boiler absorption heat quantity is lower than the target value of the boiler absorption heat quantity, it is recommended to increase the amount of combustion air or speed up the drive speeds of the combustion device 112 and the dust feeder 111 to increase the supply amount of the combustion material W.

[0060] (Other embodiments) The above-described embodiments may be modified as follows: Elements of the embodiments may be combined as long as no contradiction occurs, and suitable embodiments may be configured by combining them. (1) The combustion facility 1 may be provided with an agent injection device for injecting an agent for filtration treatment into the first exhaust gas duct L1 upstream of the bag filter 15. (2) The combustion facility 1 does not necessarily have to be provided with a structure for sending a portion of the exhaust gas to the combustion furnace 10 as a circulating exhaust gas. (3) Although the combustion control system S is illustrated as being provided in the combustion furnace 10, it may be provided in another location. (4) The incineration furnace 10 is exemplified as a stepped stoker furnace, but may be another type of incinerator such as a traveling stoker furnace.

[0061] (5) Although waste materials have been mainly exemplified as the combustion material W, other combustion materials W such as biomass may also be used. In this case, examples of biomass include waste-based biomass (livestock excrement, food waste, waste paper, pulp mill effluent, sewage sludge, human waste sludge, construction wood, sawmill residues, etc.), unused biomass (rice straw, wheat straw, rice husks, forest residues, etc.), resource crops (carbohydrate resources, starch resources, oil resources), willow, poplar, switchgrass, etc. (6) The correlation between the theoretical combustion air volume and the boiler evaporation volume (or the boiler steam heat volume, the boiler absorption heat volume, etc.) is exemplified based on actual operating data, but it may also be calculated using the correlation between the theoretical combustion air volume and the boiler evaporation volume (or the boiler steam heat volume, the boiler absorption heat volume, etc.) determined based on the design conditions of the combustion furnace 10. (7) The index indicating the amount of combustion heat may be a combination of boiler evaporation, boiler steam heat, boiler absorption heat, etc. (8) In addition to using the combustion air volume and the oxygen concentration of the exhaust gas at the combustion chamber outlet as operating process data, data on other gas concentrations, excluding moisture concentration, etc., may be used, and the theoretical combustion air volume may be calculated in real time from such data.

[0062] (Method and Program) The combustion control method may be any method that corresponds to the above-mentioned combustion control system, and uses the acquired operating process data to calculate in real time the theoretical amount of combustion air for the combustion material at the time the operating process data was acquired, calculates the combustion heat quantity based on the calculated theoretical amount of combustion air, and controls the supply amount of the combustion material and / or combustion air so that the index indicating the calculated combustion heat quantity becomes a target value.

[0063] The combustion control program may be a program for executing the steps of the combustion control method by one or more processors or information processing devices.

[0064] (effect) (1) There is no need to install a laser moisture concentration meter, and an index showing the amount of heat generated by combustion can be calculated in a simpler way, enabling responsive combustion control based on the calculation results. (2) The oxygen concentration can be measured in real time using a laser-type oxygen analyzer with an extremely short response delay, and the amount of combustion air supplied can be measured using a flow meter. The indicators showing the amount of combustion heat calculated using this measurement data (boiler evaporation amount, boiler steam heat amount, boiler absorption heat amount) can detect fluctuations in the combustion state more quickly than the actual measured values ​​of boiler evaporation amount, etc., and by using the detection results in combustion control, the combustion state can be stabilized. [Industrial Applicability]

[0065] The combustion control system and combustion control method are particularly suitable for use in various combustion facilities such as waste treatment facilities, refuse incineration facilities, and biomass power generation facilities. [Explanation of symbols]

[0066] 1. Combustion facility 10 Combustion furnace 111 Dust feeder 112 Combustion equipment 12. Boiler 13 Economizer 15 Bag filter 16 Chimney C1 control section 101a Theoretical combustion air amount calculation section 101b Boiler evaporation calculation unit 101c operation amount control section 102 Storage section 112 Combustion equipment S Combustion Control System P Combustion air supply section S1 Oxygen Concentration Meter

Claims

1. A combustion control system comprising a control unit that calculates, in real time, a theoretical combustion air amount for a combustion material at the time the operation process data is acquired using acquired operation process data, calculates an index indicating a combustion heat amount based on the calculated theoretical combustion air amount, and controls the supply amount of the combustion material and / or combustion air so that the calculated index indicating the combustion heat amount becomes a target value.

2. The combustion control system according to claim 1 , wherein the index indicating the amount of combustion heat is a boiler evaporation amount.

3. The combustion control system according to claim 1 , wherein the index indicating the amount of combustion heat is a boiler steam heat amount.

4. The combustion control system according to claim 1 , wherein the index indicating the amount of combustion heat is a boiler absorption heat amount.

5. 2. The combustion control system according to claim 1, wherein the operation process data is a combustion air amount and an oxygen concentration of exhaust gas at an outlet of the combustion chamber.

6. A combustion control method comprising: calculating, in real time using acquired operating process data, a theoretical amount of combustion air for a combustion material at the time the operating process data was acquired; calculating an index indicating the amount of combustion heat based on the calculated theoretical amount of combustion air; and controlling the amount of supply of the combustion material and / or the combustion air so that the calculated index indicating the amount of combustion heat reaches a target value.

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