A kind of hedge tower boiler

Abstract

The present invention provides a counter-hedge tower boiler, which relates to the technical field of boilers, and includes: a boiler body, a counter-hedge burner, a temperature-adjusting baffle, a flue gas duct, and a reactor; a plurality of counter-hedge burners are installed on the two side walls at the bottom of the boiler body, the temperature-adjusting baffle is installed on the top of the boiler body, a smoke exhaust port is provided above the temperature-adjusting baffle, the smoke exhaust port is connected to the reactor through a smoke duct, and a smoke recirculation system is provided between the smoke duct and the boiler body. The present invention improves the uniformity and combustion efficiency of pulverized coal by improving the arrangement method of the burner on the boiler body, thereby reducing the deviation of steam temperature; and adopts advanced combustion control technology to achieve precise control of the combustion process and improve the stability and efficiency of the boiler.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a hedge tower boiler. Background Art

[0002] The original meaning of pot refers to a container for holding water heated on fire, and furnace refers to a place where fuel is burned. A boiler consists of two parts: a pot and a furnace. The hot water or steam produced in a boiler can directly provide the required heat energy for industrial production and people's lives, or it can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator.

[0003] The existing hedge tower boiler is a boiler equipment that combines the advantages of tower layout and hedge combustion. The hedge tower boiler uses steam to evaporate water and releases heat by burning fuel (such as oil, coal, natural gas, etc.). This heat is transferred to water through a heat exchanger, and the water is heated to boiling point and evaporated into steam. The hedge combustion method allows the fuel to be fully burned in the boiler, improving the combustion efficiency. However, the hedge boiler may have a steam temperature deviation problem during operation. Due to the low calorific value of the coal type and the large total coal volume caused by the boiler combustion deviation, the coal powder concentration at the outlet of the pulverizer will have a large deviation. At the same time, the oxygen distribution required for coal powder combustion is difficult to achieve balance, which causes the combustion heat load deviation, and ultimately affects the boiler steam temperature deviation. Therefore, it is urgent to design a hedge tower boiler to solve the above problems. Summary of the invention

[0004] The present invention provides a hedge tower boiler and a solar power generation system to solve at least one of the problems raised by the above background technology.

[0005] In order to solve the above technical problems, the present invention discloses a hedge tower boiler, comprising: a boiler body, a hedge burner, a temperature control baffle, a flue gas duct, and a reactor; a plurality of groups of hedge burners are installed on the two side walls of the bottom of the boiler body, the temperature control baffle is installed on the top of the boiler body, a smoke exhaust port is provided above the temperature control baffle, the smoke exhaust port is connected to the reactor through the smoke duct, and a smoke recirculation system is provided between the smoke duct and the boiler body.

[0006] Preferably, a water-cooled wall intermediate mixing header, a lower portion of a first-stage superheater, a third-stage superheater, a low-pressure final-stage reheater, a high-pressure final-stage reheater, a second-stage superheater, a high-pressure low-temperature reheater, a low-pressure low-temperature reheater, an economizer and an upper portion of a first-stage superheater are sequentially installed above the counter-burner; the high-pressure low-temperature reheater and the low-pressure low-temperature reheater are symmetrically arranged, the lower portion of the first-stage superheater is connected to the second-stage superheater, the second-stage superheater is connected to the third-stage superheater, the lower portion of the first-stage superheater is connected to the upper portion of the first-stage superheater, the high-pressure low-temperature reheater is connected to the high-pressure final-stage reheater, and the low-pressure low-temperature reheater is connected to the low-pressure final-stage reheater.

[0007] Preferably, the counter burners include a counter main burner and a burnout sub-burner, and a plurality of groups of counter main burners are installed on the outer walls on both sides of the bottom of the boiler body, and the burnout sub-burner is located above the counter main burner.

[0008] Preferably, a denitrification mechanism is installed in the reactor, an economizer is installed below the denitrification mechanism, and an air preheater is installed at the bottom outlet of the reactor.

[0009] Preferably, the flue gas recirculation system includes: an air supply duct, a fan and an air outlet duct, one end of the air supply duct is connected to the flue gas duct, the other end of the air supply duct is connected to the inlet end of the fan, one end of the air outlet duct is connected to the outlet end of the fan, the other end of the air outlet duct passes through the two side walls of the boiler body and is located below the counter burner, and the air outlet duct is provided with a nozzle on the pipe wall below the counter burner.

[0010] Preferably, it also includes a boiler combustion performance detection device for detecting the combustion state in the hedge tower boiler, and the boiler combustion performance detection device includes:

[0011] Temperature sensor 1, used to detect the temperature of slag discharged from the furnace of the hedge tower boiler;

[0012] Temperature sensor 2, used to detect the temperature of flue gas discharged from the combustion of the hedge tower boiler;

[0013] Temperature sensor three, used to detect the temperature of the settled ash discharged from the flue during the combustion of the hedge tower boiler;

[0014] Flow meter, used to detect the main steam flow generated by the combustion of the hedge tower boiler;

[0015] A controller and an alarm, wherein the controller is electrically connected to temperature sensor 1, temperature sensor 2, temperature sensor 3, flow meter and alarm, and the controller controls the alarm to work based on temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter.

[0016] Preferably, the controller controls the alarm to work based on temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter, comprising the following steps:

[0017] Step 1: According to formula (1) and the detection values ​​of temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter, calculate the actual boiler heat loss Z after the slag, fly ash and settled ash are discharged from the boiler during the combustion process of the hedge tower boiler:

[0018]

[0019] Where Z is the actual boiler heat loss after slag, fly ash and settled ash are discharged from the boiler, A is the percentage of ash mass content of boiler fuel application basis, Q is the energy input into the boiler, α is the heat loss coefficient of slag discharged from the boiler, β is the heat loss coefficient of fly ash discharged from the boiler, γ is the heat loss coefficient of settled ash discharged from the boiler, T 1 is the detected value of the slag temperature discharged from the furnace of a counter-tower boiler by the temperature sensor, T 0 is the reference temperature, T 2 is the detection value of the exhaust gas temperature of the combustion tower boiler detected by the temperature sensor 2, T 3 The third temperature sensor is used to detect the temperature of the ash discharged from the flue of the hedge tower boiler. 1 is the specific heat of slag, C 2 is the specific heat of fly ash, C 3 is the specific heat of the settled ash;

[0020] Step 2: According to the following formula (2) and the detection value of the flow meter, the actual thermal efficiency η of the current combustion process in the hedge tower boiler is calculated. The controller compares the actual thermal efficiency η of the fuel combustion process in the current hedge tower boiler with the preset thermal efficiency range. When the actual thermal efficiency of the fuel combustion process in the actual hedge tower boiler is lower than the preset thermal efficiency range, the controller controls the alarm to sound an alarm:

[0021]

[0022] Among them, η is the actual thermal efficiency of the fuel combustion process in the current hedge tower boiler, D is the detection value of the main steam flow generated by the combustion of the hedge tower boiler by the flow meter, and G 1 is the enthalpy of steam generated by the combustion of the counter-tower boiler, G 2 is the enthalpy of feed water during combustion of the hedge tower boiler; N is the heat of formation of carbon dioxide during combustion of the hedge tower boiler.

[0023] The present invention provides a hedge tower boiler and a solar power generation system. Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The above-mentioned hedge tower boiler has the following features: first, the peak regulation depth is lower, so that the boiler can still operate stably under lower load, which improves the flexibility and adaptability of the boiler; second, the boiler can maintain the rated steam temperature of the main steam within the high load range, which helps the boiler to maintain efficient operation within a wide load range and improves the economy of the boiler; third, it can maintain lower nitrogen oxide emissions within a wide load range, which helps to reduce environmental pollution and improve the environmental performance of the boiler.

[0025] 2. The above-mentioned hedge tower boiler can adapt to a variety of fuels and different combustion requirements, with high flexibility. The boiler can be applied to large-scale combustion production to meet large-scale electricity needs. At the same time, it has good environmental protection performance and can help reduce the impact on the environment through environmental protection measures such as reducing NOx emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic structural diagram of a hedge tower boiler provided in an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1. Boiler body; 2. Counter-burner; 3. Temperature-adjusting damper; 4. Flue gas duct; 5. Reactor; 6. Water-cooled wall intermediate mixing header; 7. Lower part of primary superheater; 8. Third-stage superheater; 9. Low-pressure final reheater; 10. High-pressure final reheater; 11. Second-stage superheater; 12. High-pressure low-temperature reheater; 13. Low-pressure low-temperature reheater; 14. Economizer; 15. Upper part of primary superheater; 16. Denitrification mechanism; 17. Air preheater; 18. Air supply duct; 19. Fan; 20. Air outlet duct. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides the following embodiments

[0032] Example 1

[0033] The embodiment of the present invention provides a hedge tower boiler, such as Figure 1As shown, it includes: a boiler body 1, a counter-burner 2, a temperature-adjusting baffle 3, a flue gas duct 4, and a reactor 5; a plurality of groups of counter-burners 2 are installed on the two side walls at the bottom of the boiler body 1, the temperature-adjusting baffle 3 is installed on the top of the boiler body 1, a smoke exhaust port is provided above the temperature-adjusting baffle 3, the smoke exhaust port is connected to the reactor 5 through the smoke duct 4, and a smoke recirculation system is provided between the smoke duct 4 and the boiler body 1.

[0034] Preferably, a water-cooled wall intermediate mixing header 6, a first-stage superheater lower part 7, a third-stage superheater 8, a low-pressure final-stage reheater 9, a high-pressure final-stage reheater 10, a second-stage superheater 11, a high-pressure low-temperature reheater 12, a low-pressure low-temperature reheater 13, an economizer 14 and a first-stage superheater upper part 15 are sequentially installed above the counter-burner 2; the high-pressure low-temperature reheater 12 and the low-pressure low-temperature reheater 13 are symmetrically arranged, the first-stage superheater lower part 7 is connected to the second-stage superheater 11, the second-stage superheater 11 is connected to the third-stage superheater 8, the first-stage superheater lower part is connected to the first-stage superheater upper part 15, the high-pressure low-temperature reheater 12 is connected to the high-pressure final-stage reheater 10, and the low-pressure low-temperature reheater 13 is connected to the low-pressure final-stage reheater 9.

[0035] Preferably, the counter burner 2 includes a counter main burner and a burnout sub-burner, and multiple groups of counter main burners are installed on the outer walls on both sides of the bottom of the boiler body 1, and the burnout sub-burner is located above the counter main burner.

[0036] Preferably, a denitration mechanism 16 is installed in the reactor 5 , an economizer 14 is installed below the denitration mechanism 16 , and an air preheater 17 is installed at the bottom outlet of the reactor 5 .

[0037] Preferably, the flue gas recirculation system includes: an air supply duct 18, a fan 19 and an air outlet duct, one end of the air supply duct 18 is connected to the flue gas duct 4, the other end of the air supply duct 18 is connected to the inlet end of the fan 19, one end of the air outlet duct is connected to the outlet end of the fan 19, the other end of the air outlet duct passes through the two side walls of the boiler body 1 and is located below the counter burner 2, and a nozzle is provided on the pipe wall of the air outlet duct located below the counter burner 2.

[0038] The working principle and beneficial effects of the above technical solution are:

[0039] The present invention discloses a counter-tower boiler, which is mainly composed of a boiler body 1, a counter-tower burner 2, a temperature-adjusting baffle 3, a flue gas duct 4, and a reactor 5. The boiler is a counter-tower-arranged secondary reheating boiler, which is a DC furnace with supercritical parameter voltage conversion operation, a single furnace, secondary reheating, counter-tower combustion, balanced ventilation, solid slag removal, an all-steel suspension structure, and a coal-fired tower boiler. The upper part of the furnace is arranged in sequence along the flue gas flow with a primary superheater, a final superheater, a high-pressure high-temperature reheater, a low-pressure high-temperature reheater, a secondary superheater 11, and a furnace top partition flue heating surface (respectively, a front flue high-pressure low-temperature reheater 12 and an economizer 14, and a rear flue low-pressure low-temperature reheater 13 and an economizer 14). A flue gas regulating damper device is arranged at the top of the partition flue to distribute the flue gas volume so as to keep the reheat steam outlet temperature within the control load range; the flue gas is collected from the furnace top and introduced into the flue gas denitrification mechanism 16 on the left and right, and is introduced into the air preheater 17 after the NOx is reduced by the denitrification mechanism 16. A recirculated flue gas extraction port is arranged at the inlet of the SCR flue, and the left and right smoke extraction ducts are introduced into the mixing flue at the inlet of the flue gas recirculation fan 19. After expansion and dust reduction, the flue gas is sent into the furnace from the bottom of the burner by the three-in-one-standby flue gas recirculation fan 19; secondly, a first-stage water spray desuperheater is arranged between the first-stage superheater and the second-stage superheater 11, and between the second-stage superheater 11 and the third-stage superheater 8, and the high and low pressure reheater system adopts flue gas recirculation + tail flue gas baffle as the main adjustment method; the boiler feed water enters the water-cooled wall outlet header through the economizer 14 and the flue economizer 14, and the water-cooled wall outlet header enters the separator through the connecting pipe, and the separator outlet working medium enters the first-stage superheater, the second-stage superheater 11, and the third-stage superheater 8 through the connecting pipe, and finally enters the boiler main steam system.

[0040] The above-mentioned hedge tower boiler has the following advantages: First, the peak-shaving depth is lower, so that the boiler can still operate stably under lower loads, which improves the flexibility and adaptability of the boiler; second, the boiler can maintain the rated steam temperature of the main steam within the high load range, which helps the boiler to maintain efficient operation within a wide load range and improves the economy of the boiler; third, it can maintain low nitrogen oxide emissions within a wide load range, which helps to reduce environmental pollution and improve the environmental performance of the boiler. At the same time, the above-mentioned hedge tower boiler can adapt to a variety of fuels and different combustion requirements, with high flexibility, and the boiler can be used in large-scale combustion production to meet large-scale electricity needs. At the same time, it has good environmental protection performance and helps to reduce the impact on the environment through environmental protection measures such as reducing NOx emissions.

[0041] Example 2

[0042] The hedge tower boiler described on the basis of Example 1 preferably further comprises a boiler combustion performance detection device for detecting the combustion state in the hedge tower boiler, wherein the boiler combustion performance detection device comprises:

[0043] Temperature sensor 1, used to detect the temperature of slag discharged from the furnace of the hedge tower boiler;

[0044] Temperature sensor 2, used to detect the temperature of flue gas discharged from the combustion of the hedge tower boiler;

[0045] Temperature sensor three, used to detect the temperature of the settled ash discharged from the flue during the combustion of the hedge tower boiler;

[0046] Flow meter, used to detect the main steam flow generated by the combustion of the hedge tower boiler;

[0047] A controller and an alarm, wherein the controller is electrically connected to temperature sensor 1, temperature sensor 2, temperature sensor 3, flow meter and alarm, and the controller controls the alarm to work based on temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter.

[0048] Preferably, the controller controls the alarm to work based on temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter, comprising the following steps:

[0049] Step 1: According to formula (1) and the detection values ​​of temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter, calculate the actual boiler heat loss Z after the slag, fly ash and settled ash are discharged from the boiler during the combustion process of the hedge tower boiler:

[0050]

[0051] Where Z is the actual boiler heat loss after slag, fly ash and settled ash are discharged from the boiler, A is the percentage of ash mass content of boiler fuel application basis, Q is the energy input into the boiler, α is the heat loss coefficient of slag discharged from the boiler, β is the heat loss coefficient of fly ash discharged from the boiler, γ is the heat loss coefficient of settled ash discharged from the boiler, T 1 is the detected value of the slag temperature discharged from the furnace of a counter-tower boiler by the temperature sensor, T 0 is the reference temperature, T 2 is the detection value of the exhaust gas temperature of the combustion tower boiler detected by the temperature sensor 2, T 3 The third temperature sensor is used to detect the temperature of the ash discharged from the flue of the hedge tower boiler. 1 is the specific heat of slag, C 2 is the specific heat of fly ash, C 3 is the specific heat of the settled ash;

[0052] Step 2: According to the following formula (2) and the detection value of the flow meter, the actual thermal efficiency η of the current combustion process in the hedge tower boiler is calculated. The controller compares the actual thermal efficiency η of the fuel combustion process in the current hedge tower boiler with the preset thermal efficiency range. When the actual thermal efficiency of the fuel combustion process in the actual hedge tower boiler is lower than the preset thermal efficiency range, the controller controls the alarm to sound an alarm:

[0053]

[0054] Among them, η is the actual thermal efficiency of the fuel combustion process in the current hedge tower boiler, D is the detection value of the main steam flow generated by the combustion of the hedge tower boiler by the flow meter, and G 1 is the enthalpy of steam generated by the combustion of the counter-tower boiler, G 2 is the enthalpy of feed water during combustion of the hedge tower boiler; N is the amount of carbon dioxide generated during combustion of the hedge tower boiler; H is the heat of reaction generated during combustion of the hedge tower boiler.

[0055] The beneficial effects of the above technical scheme are as follows: first, according to formula (1) and the detection values ​​of temperature sensor 1, temperature sensor 2 and temperature sensor 3, the actual boiler heat loss after slag, fly ash and sedimentation ash are discharged from the boiler is calculated, and the calculation result is more accurate and reliable by comprehensively considering the percentage of the ash mass content of the boiler fuel application basis, the energy input inside the boiler, the heat loss coefficient of slag discharged from the boiler, the heat loss coefficient of fly ash discharged from the boiler, the heat loss coefficient of sedimentation ash discharged from the boiler, the slag temperature discharged from the furnace of the hedge tower boiler, the reference temperature, the flue gas temperature discharged from the combustion of the hedge tower boiler, the temperature of the sedimentation ash discharged from the flue of the combustion of the hedge tower boiler, the specific heat of the slag, the specific heat of the fly ash, and the specific heat of the sedimentation ash;

[0056] Then, according to formula (2) and the detection value of the flow meter, the actual thermal efficiency of the fuel combustion process in the current hedge tower boiler is calculated, and the detection value of the main steam flow generated by the combustion of the hedge tower boiler, the enthalpy of the steam generated by the combustion of the hedge tower boiler, the enthalpy of the feed water during the combustion of the hedge tower boiler, the amount of carbon dioxide generated during the combustion of the hedge tower boiler, and the heat generated by the reaction during the combustion of the hedge tower boiler are comprehensively considered, so that the calculation result is more accurate and reliable;

[0057] The controller controls the alarm to work based on the temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter. If during the combustion process of the hedge tower boiler, the actual thermal efficiency of the current combustion process in the hedge tower boiler is within the preset thermal efficiency range, the controller controls the alarm to sound, thereby reminding the staff to inspect the hedge tower boiler in time, and perform maintenance on the hedge tower boiler according to the actual inspection results to maintain the use requirements of the hedge tower boiler, while ensuring the normal operation of the hedge tower boiler and high combustion efficiency, further meeting the use requirements of the hedge tower boiler for operational reliability and stability, and by real-time monitoring of the working status of the hedge tower boiler during the combustion process, it can ensure that the hedge tower boiler can be quickly discovered and repaired in time after a failure occurs.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hedge tower boiler, characterized in that: include: A boiler body (1), a counter-burner (2), a temperature-adjusting baffle (3), a flue gas duct (4), and a reactor (5); a plurality of counter-burners (2) are installed on the two side walls at the bottom of the boiler body (1); the temperature-adjusting baffle (3) is installed on the top of the boiler body (1); a smoke exhaust port is provided above the temperature-adjusting baffle (3); the smoke exhaust port is connected to the reactor (5) through the smoke duct (4); and a smoke recirculation system is provided between the smoke duct (4) and the boiler body (1).

2. The hedge tower boiler according to claim 1, characterized in that: A water-cooled wall intermediate mixing header (6), a first-stage superheater lower portion (7), a third-stage superheater (8), a low-pressure final-stage reheater (9), a high-pressure final-stage reheater (10), a second-stage superheater (11), a high-pressure low-temperature reheater (12), a low-pressure low-temperature reheater (13), an economizer (14) and a first-stage superheater upper portion (15) are sequentially installed above the counter-burner burner (2); the high-pressure low-temperature reheater (12) and the low-pressure low-temperature reheater (13) are symmetrically arranged, the first-stage superheater lower portion (7) is connected to the second-stage superheater (11), the second-stage superheater (11) is connected to the third-stage superheater (8), the first-stage superheater lower portion is connected to the first-stage superheater upper portion (15), the high-pressure low-temperature reheater (12) is connected to the high-pressure final-stage reheater (10), and the low-pressure low-temperature reheater (13) is connected to the low-pressure final-stage reheater (9).

3. The hedge tower boiler according to claim 1, characterized in that: The counter burner (2) comprises a counter main burner and a burnout sub-burner. Multiple groups of counter main burners are installed on the outer walls on both sides of the bottom of the boiler body (1), and the burnout sub-burner is located above the counter main burner.

4. The hedge tower boiler according to claim 1, characterized in that: A denitration mechanism (16) is installed in the reactor (5), a coal economizer (14) is installed below the denitration mechanism (16), and an air preheater (17) is installed at the bottom outlet of the reactor (5).

5. The hedge tower boiler according to claim 1, characterized in that: The flue gas recirculation system comprises: an air supply duct (18), a fan (19) and an air outlet duct, wherein one end of the air supply duct (18) is connected to the flue gas duct (4), the other end of the air supply duct (18) is connected to the inlet end of the fan (19), one end of the air outlet duct is connected to the outlet end of the fan (19), the other end of the air outlet duct passes through the two side walls of the boiler body (1) and is located below the counter-burner (2), and a nozzle is provided on the pipe wall of the air outlet duct located below the counter-burner (2).

6. The hedge tower boiler according to claim 1, characterized in that: It also includes a boiler combustion performance detection device for detecting the combustion state in the hedge tower boiler, and the boiler combustion performance detection device includes: Temperature sensor 1, used to detect the temperature of slag discharged from the furnace of the hedge tower boiler; Temperature sensor 2, used to detect the temperature of flue gas discharged from the combustion of the hedge tower boiler; Temperature sensor three, used to detect the temperature of the settled ash discharged from the flue during the combustion of the hedge tower boiler; Flow meter, used to detect the main steam flow generated by the combustion of the hedge tower boiler; A controller and an alarm, wherein the controller is electrically connected to temperature sensor 1, temperature sensor 2, temperature sensor 3, flow meter and alarm, and the controller controls the alarm to work based on temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter.

7. The hedge tower boiler according to claim 6, characterized in that: The controller controls the alarm to work based on the temperature sensor 1, the temperature sensor 2, the temperature sensor 3 and the flow meter, and includes the following steps: Step 1: According to formula (1) and the detection values ​​of temperature sensor 1, temperature sensor 2, temperature sensor 3 and flow meter, calculate the actual boiler heat loss Z after the slag, fly ash and settled ash are discharged from the boiler during the combustion process of the hedge tower boiler: Wherein, Z is the actual boiler heat loss after slag, fly ash and sedimentation ash are discharged from the boiler, A is the percentage of the ash mass content of the boiler fuel application basis, Q is the energy input into the boiler, α is the heat loss coefficient of slag discharged from the boiler, β is the heat loss coefficient of fly ash discharged from the boiler, γ is the heat loss coefficient of sedimentation ash discharged from the boiler, T1 is the detection value of the slag temperature discharged from the furnace of the hedging tower boiler by temperature sensor one, T0 is the reference temperature, T2 is the detection value of the flue gas temperature discharged from the combustion of the hedging tower boiler by temperature sensor two, T3 is the detection value of the sedimentation ash temperature discharged from the flue of the combustion of the hedging tower boiler by temperature sensor three, C1 is the specific heat of slag, C2 is the specific heat of fly ash, and C3 is the specific heat of sedimentation ash; Step 2: According to the following formula (2) and the detection value of the flow meter, the actual thermal efficiency η of the current combustion process in the hedge tower boiler is calculated. The controller compares the actual thermal efficiency η of the fuel combustion process in the current hedge tower boiler with the preset thermal efficiency range. When the actual thermal efficiency of the fuel combustion process in the actual hedge tower boiler is lower than the preset thermal efficiency range, the controller controls the alarm to sound an alarm: Among them, η is the actual thermal efficiency of the fuel combustion process in the current hedge tower boiler, D is the detection value of the main steam flow generated by the combustion of the hedge tower boiler by the flow meter, G1 is the enthalpy of steam generated by the combustion of the hedge tower boiler, G2 is the enthalpy of feed water during the combustion of the hedge tower boiler; N is the heat of formation of carbon dioxide during the combustion of the hedge tower boiler.

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