CN109539247B - Coal gasification low-nitrogen combustor system for thermal power boiler - Google Patents
Coal gasification low-nitrogen combustor system for thermal power boiler Download PDFInfo
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- CN109539247B CN109539247B CN201811237002.7A CN201811237002A CN109539247B CN 109539247 B CN109539247 B CN 109539247B CN 201811237002 A CN201811237002 A CN 201811237002A CN 109539247 B CN109539247 B CN 109539247B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2700/00—Special arrangements for combustion apparatus using fluent fuel
- F23C2700/06—Combustion apparatus using pulverized fuel
- F23C2700/066—Other special arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/06—Sampling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
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Abstract
The invention belongs to the field of low-nitrogen combustion of large thermal power boilers, and particularly relates to a coal gasification low-nitrogen combustor system for a thermal power boiler. The system mainly comprises a dense-phase pulverized coal gasification burner, a variable-frequency high-temperature resistant fan, a flue gas analyzer, a natural gas gun body assembly, an oxygen inlet, an automatic control cabinet, a light-phase pulverized coal burner, a pulverized coal eccentric separation elbow and the like.
Description
Technical Field
The invention belongs to the field of low-nitrogen combustion of large thermal power boilers, and particularly relates to a coal gasification low-nitrogen combustor system for a thermal power boiler.
Background
The nitrogen oxide is one of main pollutants causing air pollution, more than 90% of artificially-discharged nitrogen oxide comes from the combustion process of fossil fuels, and the nitrogen oxide discharge amount of thermal power coal-fired boilers in China accounts for 60% of the total industrial discharge amount, so that the method has very important significance for reducing the nitrogen oxide discharge amount of the thermal power boilers.
The low-nitrogen combustor is an effective method for remarkably reducing the emission of nitrogen oxides of a thermal power boiler, and common low-nitrogen combustors include a double-air-regulation combustor, a Hitachi low-nitrogen combustor, an XCL low-nitrogen combustor and the like. The double air-adjusting burner injects fuel to the combustion zone along with the axial direction of primary air, when oxygen in the primary air is consumed in the fuel-rich zone, the air-fuel ratio in the primary combustion zone is rapidly reduced, so that the fuel is in an anoxic state during devolatilization, carbon, hydrogen and volatile nitrogen compete for the oxygen, nitrogen molecules are generated more than NO and NO2 due to the lack of the competitive power of the nitrogen, and secondary air is gradually mixed with the fuel through the air adjuster to form a volatile matter separation zone, a hot combustion product circulation zone and a complete combustion zone, so that the aim of reducing nitrogen oxides is fulfilled. The Hitachi low-nitrogen burner is developed on the basis of a double-air-regulation swirling burner, and is characterized in that a ceramic flame stabilizing ring is arranged at the outlet of a nozzle, so that backflow is formed at the outlet of the nozzle, pulverized coal is rapidly ignited after leaving a fuel nozzle, a nitrogen oxide reducing area is formed under the condition of low air-fuel ratio, when flame is continuously conveyed forwards, secondary air with high swirling flow reenters the core of the flame and flows downstream until the flame is completely combusted, and effective swirling flow is utilized to accelerate mixing so as to promote the reduction of the nitrogen oxide. The XCL low-nitrogen combustor adopts a sliding sleeve valve to adjust the inner and outer airflow areas, adopts an airflow separation blade structure in the inner and outer airflow areas, realizes the staged ignition of pulverized coal and the staged air supplement, can make the flame shape adapt to the furnace type through the selection of an impeller, reduces nitrogen oxides, and can keep high combustion efficiency.
However, the low-nitrogen burner can only reduce the generation amount of nitrogen oxides to a certain extent, has limited effect of reducing the pressure of a denitration system at the tail of the boiler, and is easy to cause the negative effect of increasing the carbon content of fly ash, so that the research on the novel low-nitrogen burner by adopting a new theory and a new method still has very important significance.
The existing theory proves that compared with the direct combustion of coal, the concentration of nitrogen oxides generated in the combustion process of coal gas generated after coal gasification can be reduced by more than 90. In addition, the coal gas has reducibility, the coal gas and the coal powder are mixed together for combustion, and the coal gas can reduce nitrogen oxides generated by the combustion of the coal powder. Based on the above theory, the invention provides a novel coal gasification low-nitrogen combustor system.
Disclosure of Invention
The invention aims to solve the problem that the concentration of nitrogen oxides generated in the pulverized coal combustion process of a large thermal power boiler is too high. The invention provides a low-nitrogen burner for a thermal power boiler, which has advanced principle and simple structure. The invention can establish high-temperature and oxygen-deficient atmosphere in the combustor, creates favorable conditions for coal powder gasification, realizes the purposes of firstly gasifying dense-phase coal powder (namely dense-phase coal powder) and then mixing and burning the dense-phase coal powder and light-phase coal powder, fully utilizes the reducibility of coal gas, establishes reducibility atmosphere in a main burning area of the boiler, inhibits and reduces the generation of nitrogen oxides, improves the ignition condition of the coal powder and reduces the incomplete combustion loss.
The technical scheme for solving the technical problems is as follows:
the dense-phase pulverized coal gasification burner comprises a shell, a pulverized coal gasification chamber, a flue gas sampling tube, a thermocouple, a pulverized coal enrichment guide block, a flue gas injection device, a flue gas sleeve and a natural gas combustion chamber, wherein the shell is in a gradually expanding shape, a natural gas gun body assembly penetrates through a dense-phase outlet of a pulverized coal eccentric separation elbow and is inserted into the right side of the shell from the horizontal direction, the left side of the natural gas gun body assembly is connected with the natural gas combustion chamber, the flue gas sleeve and the natural gas combustion chamber are coaxially and parallelly installed, the flue gas injection device is installed on the left side of the flue gas sleeve, the left side of the flue gas injection device is flush with the left side of the natural gas combustion chamber, the pulverized coal gasification chamber is coaxially installed at the downstream of the outlet of the natural gas combustion chamber, the flue gas sampling tube is installed on the wall surface of the pulverized coal gasification chamber and is communicated with the flue, the other end of the thermocouple is connected with an automatic control cabinet through a compensating lead, and a coal dust enrichment guide block is arranged in the middle of the shell (between the natural gas combustion chamber and the coal dust gasification chamber).
The coal gasification low-nitrogen burner system comprises a dense-phase coal powder gasification burner, a variable-frequency high-temperature resistant fan, a flue gas analyzer, a natural gas gun body assembly, an oxygen inlet, a flow regulating valve, an automatic control cabinet, a light-phase coal powder burner, a coal powder eccentric separation elbow and a natural gas inlet, wherein the light-phase coal powder burner is arranged at the lower part of a hearth, the dense-phase coal powder gasification burner is arranged above the light-phase coal powder burner, the inlet of the coal powder eccentric separation elbow is connected with a coal powder pipeline, the outlet of the dense-phase coal powder gasification burner is divided into an upper part and a lower part which are respectively connected with the inlets of the dense-phase coal powder gasification burner and the light-phase coal powder burner, the upper part of the hearth is communicated with a flame folding angle, the inlet of the variable-frequency high-temperature resistant fan is connected with the flame folding angle through a pipeline, the outlet of the variable-frequency high-, insert the eccentric separation elbow of buggy from the horizontal direction, and extend to in the close looks buggy gasification burner, oxygen entry and natural gas entry are installed to the right-hand member of natural gas rifle body subassembly, flow control valve's entry and oxygen pipe connection, flow control valve's export is passed through the pipeline and is connected with the oxygen entry, flow control valve's entry and natural gas pipe connection, flow control valve's export is passed through the pipeline and is connected with the natural gas entry, flue gas analyzer's entry is passed through the sampling tube and is connected with close looks buggy gasification burner, the high temperature resistant fan of frequency conversion, flue gas analyzer, flow control valve is connected with the automatic control cabinet through power cable and control cable respectively.
The beneficial effect of above-mentioned device is:
(1) the invention can create the oxygen-deficient atmosphere required by coal powder gasification. The invention utilizes the frequency conversion high temperature resistant fan to introduce the high temperature flue gas at the corner of the folding flame into the dense phase coal powder gasification low-nitrogen combustor, and has the following two functions: firstly, the characteristic that the oxygen concentration in the high-temperature flue gas is only 3% -4% is utilized, the oxygen concentration after the flue gas and the primary air-powder airflow are mixed is effectively reduced, which is very important for the successful gasification of the coal powder, because the coal powder can be subjected to gasification reaction only in the high-temperature and oxygen-deficient atmosphere, and if the oxygen concentration is higher, the coal powder can be subjected to combustion reaction and cannot be gasified. Secondly, the temperature of the flue gas at the corner of the folding flame is above 1000 ℃, and the primary air-powder airflow can be preheated by utilizing the characteristic of high temperature, so that the temperature of the airflow in the coal gasification chamber basically reaches the range of 500-600 ℃, and is basically close to the temperature required by the separation of volatile matters, thereby providing favorable conditions for the next coal gasification.
(2) The invention can create the temperature required by the instant gasification of the coal powder. According to the operation data of the coal powder gasification furnace, when the temperature exceeds 1500 ℃, the coal powder can be directly gasified instantly in an oxygen-deficient environment. In the natural gas combustion chamber, pure oxygen is used for supporting combustion of natural gas, the temperature of the generated white flame is over 2000 ℃, and the temperature requirement required by instant gasification of pulverized coal can be completely met.
(3) The invention can measure the optimal oxygen concentration range of coal powder gasification in an experiment. Because the gasification reaction of pulverized coal is an endothermic reaction, part of the heat required is supplied by the combustion of natural gas and the other part is supplied by the combustion of volatile components first precipitated from pulverized coal, the oxygen concentration of the air-pulverized gas stream mixture is notThe lower the better, but there is an optimum range. The invention determines the optimum range of oxygen concentration by: continuously sampling the actual condition of coal gasification through a sampling tube arranged on a coal gasification chamber, and carrying out O-gas analysis through a flue gas analyzer2、CO、CH4And analyzing the main components, comparing the generation conditions of the reducing gas under different oxygen concentrations, further determining the optimal oxygen concentration, and generating a historical record curve to be recorded in an automatic control system.
(4) The invention can flexibly adjust the oxygen concentration in the coal gasification chamber. The specific method comprises the following steps: the oxygen concentration in the coal gasification chamber is sampled and measured by a sampling tube and a flue gas analyzer, and then the measured value is compared with the optimal range recorded in an automatic control system. If the measured value is not in the optimal range, the rotating speed of the variable-frequency high-temperature-resistant fan is adjusted through the automatic control cabinet, so that the flow of the flue gas is changed, and the aim of adjusting the oxygen concentration of the mixture of the flue gas and the primary air is fulfilled.
(5) The invention can flexibly adjust the temperature field in the coal gasification chamber. The specific method comprises the following steps: firstly, the mixture temperature in the coal gasification chamber is measured through a thermocouple, and then the measured value is compared with a target value in an automatic control system (according to the design operation data of the existing coal powder gasification furnace, the temperature required by the instant gasification of the coal powder is not lower than 1500 ℃). If the measured value is lower than the target value, the regulating valves of the natural gas pipeline and the oxygen pipeline are automatically adjusted to be larger through the automatic control cabinet, the flow of the natural gas and the oxygen is increased, the temperature field in the gasification chamber can be rapidly improved, and the requirement of rapid gasification of the pulverized coal is met.
(6) The invention can effectively prolong the time required by coal powder gasification. The coal powder gasification chamber and the dense phase coal powder burner have the shell of a gradually expanding shape. The shape is beneficial to reducing the flow velocity of the air-powder mixture in the combustor and prolonging the retention time of the coal powder in the coal powder gasification chamber, thereby being beneficial to the smooth operation of coal powder gasification.
(7) The invention can improve the burnout rate of the pulverized coal. The specific principle is as follows: firstly, the coal powder entering the coal powder gasification chamber is gasified into combustible gas, so that the coal powder is easy to ignite, and the heat generated by ignition can be used for rapidly heating other coal powder to ignition temperature, so that the ignition performance of coal powder airflow can be greatly improved by adopting the invention. Secondly, under the action of high-temperature flue gas, the pulverized coal airflow is preheated to a higher temperature level (500-600 ℃) in the combustor, so that ignition heat required to be absorbed by the pulverized coal airflow after the pulverized coal airflow enters a hearth is greatly reduced, the ignition of the pulverized coal can be advanced, the ignition stability of the pulverized coal is improved, and the burnout rate of the pulverized coal is increased.
The coal powder eccentric separation elbow comprises a dilute phase outlet, a dense phase outlet, an outlet separation baffle, a motor, a rotating shaft and a coal powder airflow adjusting baffle, wherein the outlet separation baffle is arranged at the outlet position of the coal powder eccentric separation elbow, the left side of the outlet separation baffle is flush with the outlet end face of the coal powder eccentric separation elbow, the outlet separation baffle divides the outlet of the coal powder eccentric separation elbow into a dense phase outlet and a dilute phase outlet in the vertical direction, the flow area of the dense phase outlet is about 1/2 of the dilute phase outlet, the dense phase outlet is communicated with a dense phase gasification coal powder burner, the dilute phase outlet is communicated with a dilute phase coal powder burner, the left side of the coal powder airflow adjusting baffle is connected with the outlet separation baffle through the rotating shaft, the motor is connected with the coal powder airflow adjusting baffle through a connecting rod and can drive the coal powder airflow adjusting baffle to rotate around the rotating shaft within the range of 90 degrees (namely the coal powder airflow adjusting baffle can freely, the motor is connected with the automatic control cabinet through a power cable and a control cable.
The beneficial effect of above-mentioned device is:
(1) the invention can improve the coal powder concentration of the coal powder airflow and reduce the heat source power required by coal powder gasification in unit mass (namely, the consumption of natural gas and oxygen can be reduced by improving the coal powder concentration). The specific implementation method comprises the following two steps: firstly, the high-concentration coal dust airflow is formed at the outer side of the elbow by utilizing the inertial centrifugal separation effect generated when the coal dust airflow flows through the coal dust eccentric separation elbow, and is guided into the dense-phase coal dust gasification combustor through the dense-phase outlet. Secondly, in the dense-phase coal powder gasification burner, the coal powder enrichment guide block arranged on the shell impacts coal powder particles to change the flow direction and concentrate the coal powder particles to the central area of the burner, so that the formed coal powder enters a coal gasification chamber after being concentrated for the second time. Therefore, the coal gasification chamber finally obtains very high coal dust concentration, reduces the primary air quantity required by carrying unit mass of coal dust, reduces the gasification heat required by unit mass of coal dust, and achieves the aim of saving natural gas and oxygen.
(2) The invention can effectively adjust the flow ratio of the dense-phase coal dust airflow and the light-phase coal dust airflow. The specific implementation method comprises the following steps: the motor can drive the pulverized coal airflow adjusting baffle to rotate within a range of 90 degrees around the rotating shaft, when the baffle rotates clockwise, the airflow and the pulverized coal flow entering the dense-phase pulverized coal gasification burner are increased, and when the baffle moves anticlockwise, the airflow and the pulverized coal flow entering the dilute-phase pulverized coal burner are increased. Therefore, in the actual operation process, if the coal powder gasification effect is found to be poor, the air-powder flow entering the dense-phase coal powder gasification combustor can be reduced, so that the flow speed of the coal powder in the dense-phase coal powder gasification combustor is reduced, which is equivalent to prolonging the coal powder gasification time, and the purpose of improving the coal powder gasification effect is achieved. On the contrary, if the coal powder gasification effect is better, the flow of the air and the powder entering the dense-phase coal powder gasification combustor should be increased as much as possible so as to gasify more coal powder.
In conclusion, the invention can create a favorable high-temperature and anoxic environment for the gasification of the coal powder, so that the high-concentration coal powder entering the coal gasification chamber is gasified before ignition to generate reducing gas, thereby not only reducing the nitrogen oxides generated by self combustion, but also reducing the nitrogen oxides generated by direct combustion of the rest coal powder and light-phase coal powder in the dense-phase coal powder gasification combustor, and finally achieving the purpose of reducing the total generation amount of the nitrogen oxides in the combustion process of the coal powder.
Drawings
FIG. 1 is a coal gasification low-nitrogen burner system for a thermal power boiler;
FIG. 2 is an eccentric coal powder separating elbow;
FIG. 3 is a dense phase coal powder gasification burner;
in the figure: 1 hearth, 2 dense phase coal powder gasification burner, 21 shell, 22 coal powder gasification chamber, 23 flue gas sampling tube, 24 thermocouple, 25 coal powder enrichment guide block, 26 flue gas injection device, 27 flue gas sleeve, 28 natural gas combustion chamber, 3 flame folding angle, 4 frequency conversion high temperature resistant fan, 5 flue gas analyzer, 6 natural gas gun body component, 7 oxygen inlet, 8a flow regulating valve, 8b flow regulating valve, 9 automatic control cabinet, 10 light phase coal powder burner, 11 coal powder eccentric separation elbow, 111 light phase outlet, 112 dense phase outlet, 113 outlet separation baffle, 114 motor, 115 rotation axis, 116 coal powder airflow regulation baffle, 12 natural gas inlet.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the coal gasification low-nitrogen burner system for thermal power boiler in this embodiment includes a dense-phase pulverized coal gasification burner 2, a frequency conversion high temperature resistant fan 4, a flue gas analyzer 5, a natural gas gun body assembly 6, an oxygen inlet 7, a flow control valve 8a, a flow control valve 8b, an automatic control cabinet 9, a light-phase pulverized coal burner 10, a pulverized coal eccentric separation elbow 11, and a natural gas inlet 12, wherein the light-phase pulverized coal burner 10 and the dense-phase pulverized coal gasification burner 2 are both installed at the lower part of a furnace 1, the dense-phase pulverized coal gasification burner 2 is located above the light-phase pulverized coal burner 10, the inlet of the pulverized coal eccentric separation elbow 11 is connected with a pulverized coal pipeline by bolts, the outlet is divided into an upper part and a lower part, and is respectively connected with the inlets of the dense-phase pulverized coal burner 2 and the light-phase pulverized coal burner 10 by bolts, the upper part of the furnace 1 is communicated with a flame break angle, an inlet of a variable-frequency high-temperature resistant fan 5 is connected and communicated with the flame folding angle 3 in a welding mode through a pipeline, an outlet of the variable-frequency high-temperature resistant fan 5 is connected and communicated with a dense-phase pulverized coal gasification burner 8 in a welding mode through a pipeline, a natural gas gun body assembly 6 is inserted from the upper part of a pulverized coal eccentric separation elbow 11 in the horizontal direction and extends into the dense-phase pulverized coal gasification burner 2, an oxygen inlet 7 and a natural gas inlet 12 are welded at the right end of the natural gas gun body assembly 6 and are communicated with each other, an inlet of a flow regulating valve 8a is connected with an oxygen pipeline, an outlet of a flow regulating valve 8a is connected with the oxygen inlet 7 through a pipeline, an inlet of a flow regulating valve 8b is connected with a natural gas pipeline, an outlet of the flow regulating valve 8b is connected with the natural gas inlet 7 through a pipeline, an inlet of a flue gas analyzer 5, the frequency conversion high temperature resistant fan 4, the flue gas analyzer 5, the flow regulating valve 8a and the flow regulating valve 8b are respectively connected with the automatic control cabinet 9 through a power cable and a control cable.
As shown in fig. 2, the coal powder eccentric separation elbow 11 in this embodiment further includes a dilute phase outlet 111, a dense phase outlet 112, an outlet separation baffle 113, a motor 114, a rotating shaft 115, and a coal powder airflow adjusting baffle 116, wherein the outlet separation baffle 113 is welded at the outlet of the coal powder eccentric separation elbow 11, the left side of the outlet separation baffle 113 is flush with the outlet end face of the coal powder eccentric separation elbow 11, the outlet separation baffle 113 vertically divides the outlet of the coal powder eccentric separation elbow 11 into the dense phase outlet 112 and the dilute phase outlet 111, the flow area of the dense phase outlet 112 is about 1/2 of the dilute phase outlet 111, the dense phase outlet 112 is connected and communicated with the dense phase coal powder gasification burner 2, the dilute phase outlet 111 is connected and communicated with the dilute phase coal powder burner 10, two sides of the rotating shaft 115 are fixed on the right side of the outlet separation baffle 113, the left side of the coal powder airflow adjusting baffle 116 is connected with the outlet separation baffle 113, the motor 114 is connected with the pulverized coal airflow adjusting baffle 116 through a connecting rod and can drive the pulverized coal airflow adjusting baffle 116 to rotate around the rotating shaft 115 within a range of 90 degrees (namely, the pulverized coal airflow adjusting baffle 116 can freely rotate within a range from horizontal to vertical), and the motor 114 is connected with the automatic control cabinet 9 through a power cable and a control cable.
As shown in fig. 3, the dense phase pulverized coal gasification burner 2 in this embodiment further includes a casing 21, a pulverized coal gasification chamber 22, a flue gas sampling tube 23, a thermocouple 24, a pulverized coal enrichment guide block 25, a flue gas injection device 26, a flue gas sleeve 27, and a natural gas combustion chamber 28, where the casing 21 is in a gradually expanding shape, the natural gas gun body assembly 6 passes through the dense phase outlet 112 of the pulverized coal eccentric separation elbow 11, is inserted into the right side of the casing 21 from the horizontal direction, and extends into the casing 21 to be connected and communicated with the natural gas combustion chamber 28, the flue gas sleeve 27 and the natural gas combustion chamber 28 are installed coaxially and in parallel, the flue gas injection device 26 is welded on the left side of the flue gas sleeve 27, the left side of the flue gas injection device 26 is flush with the left side of the natural gas combustion chamber 28, the pulverized coal gasification chamber 22 is installed coaxially on the left downstream of the natural gas combustion chamber 28, and keep communicating, the outlet welding of the flue gas sampling tube 23 has stainless steel tube to connect with flue gas analyzer 5, still weld thermocouple 24 in the cliff side of the coal dust gasification chamber 22, the other end of the thermocouple 24 is connected with automatic control cabinet 9 through compensating the wire, install the coal dust and enrich the guide block 25 in the middle part of the outer casing 21 (between combustion chamber of natural gas 28 and coal dust gasification chamber 22).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A coal gasification low-nitrogen burner system for a thermal power boiler is characterized in that: comprises a dense-phase pulverized coal gasification burner (2), a variable-frequency high-temperature resistant fan (4), a flue gas analyzer (5), a natural gas gun body assembly (6), an oxygen inlet (7), flow regulating valves (8 a, 8 b), an automatic control cabinet (9), a light-phase pulverized coal burner (10), a pulverized coal eccentric separation elbow (11) and a natural gas inlet (12), wherein the light-phase pulverized coal burner (10) and the dense-phase pulverized coal gasification burner (2) are both arranged at the lower part of a hearth (1), the dense-phase pulverized coal gasification burner (2) is positioned above the light-phase pulverized coal burner (10), the inlet of the pulverized coal eccentric separation elbow (11) is connected with a pulverized coal pipeline, the outlet is divided into an upper part and a lower part which are respectively connected with the inlets of the dense-phase pulverized coal gasification burner (2) and the light-phase pulverized coal burner (10), the upper part of the hearth (1) is communicated with a flame folding angle (3), an inlet of a frequency conversion high temperature resistant fan (4) is connected with the flame folding angle (3) through a pipeline, an outlet of the frequency conversion high temperature resistant fan (4) is connected with the dense-phase pulverized coal gasification burner (8) through a pipeline, a natural gas gun body assembly (6) is inserted from the upper part of a pulverized coal eccentric separation elbow (11) in the horizontal direction and extends into the dense-phase pulverized coal gasification burner (2), an oxygen inlet (7) and a natural gas inlet (12) are installed at the right end of the natural gas gun body assembly (6), an inlet of a flow regulating valve I (8 a) is connected with the oxygen pipeline, an outlet of the flow regulating valve I (8 a) is connected with the oxygen inlet (7) through a pipeline, an inlet of a flow regulating valve II (8 b) is connected with the natural gas pipeline, an outlet of the flow regulating valve II (8 b) is connected with the natural gas inlet (12) through a pipeline, an inlet of a flue gas analyzer (5) is connected with the dense-phase pulverized coal, the variable-frequency high-temperature-resistant fan (4), the flue gas analyzer (5), the first flow regulating valve (8 a) and the second flow regulating valve (8 b) are respectively connected with the automatic control cabinet (9) through power cables and control cables.
2. The coal gasification low-nitrogen burner system for the thermal power boiler according to claim 1, characterized in that: the coal powder eccentric separation elbow (11) further comprises a dilute phase outlet (111), a dense phase outlet (112), an outlet separation baffle (113), a motor (114), a rotating shaft (115) and a coal powder airflow adjusting baffle (116), wherein the outlet separation baffle (113) is arranged at the outlet position of the coal powder eccentric separation elbow (11), the left side of the outlet separation baffle is flush with the outlet end face of the coal powder eccentric separation elbow (11), the outlet separation baffle (113) divides the outlet of the coal powder eccentric separation elbow (11) into the dense phase outlet (112) and the dilute phase outlet (111) in the vertical direction, the flow area of the dense phase outlet (112) is 1/2 of the dilute phase outlet (111), the dense phase outlet (112) is connected and communicated with the dense phase coal powder gasification burner (2), the dilute phase outlet (111) is connected and communicated with the dilute phase coal powder burner (10), the left side of the coal powder airflow adjusting baffle (116) is connected with the outlet separation baffle (113) through the rotating shaft (115), the motor (114) is connected with the pulverized coal airflow adjusting baffle (116) through a connecting rod and can drive the pulverized coal airflow adjusting baffle (116) to rotate around the rotating shaft (115) within the range of 90 degrees, and the motor (114) is connected with the automatic control cabinet (9) through a power cable and a control cable.
3. The coal gasification low-nitrogen burner system for the thermal power boiler according to claim 1, characterized in that: dense-phase pulverized coal gasification burner (2) further comprises a shell (21), a pulverized coal gasification chamber (22), a flue gas sampling tube (23), a thermocouple (24), a pulverized coal enrichment guide block (25), a flue gas injection device (26), a flue gas sleeve (27) and a natural gas combustion chamber (28), wherein the shell (21) is in a gradually expanding shape, a natural gas gun body assembly (6) penetrates through a dense-phase outlet (112) of a pulverized coal eccentric separation elbow (11) and is inserted into the right side of the shell (21) from the horizontal direction, the left side of the natural gas gun body assembly (6) is connected with the natural gas combustion chamber (28), the flue gas sleeve (27) and the natural gas combustion chamber (28) are coaxially and parallelly installed, the flue gas injection device (26) is installed on the left side of the flue gas sleeve (27), the left side of the flue gas injection device (26) is flush with the left side of the natural gas combustion chamber (28), and the pulverized coal gasification chamber (22) is, install flue gas sampling tube (23) on the wall of buggy gasification room (22), and keep the intercommunication, the export of flue gas sampling tube (23) is passed through stainless steel pipe and is connected with flue gas analyzer (5), still install thermocouple (24) in the wall of buggy gasification room (22), the other end of thermocouple (24) is connected with automatic control cabinet (9) through compensating the wire, install buggy enrichment guide block (25) in the middle part of shell (21) and the position that is located between natural gas combustion chamber (28) and buggy gasification room (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237002.7A CN109539247B (en) | 2018-10-23 | 2018-10-23 | Coal gasification low-nitrogen combustor system for thermal power boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237002.7A CN109539247B (en) | 2018-10-23 | 2018-10-23 | Coal gasification low-nitrogen combustor system for thermal power boiler |
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| CN109539247A CN109539247A (en) | 2019-03-29 |
| CN109539247B true CN109539247B (en) | 2020-02-14 |
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| CN201811237002.7A Active CN109539247B (en) | 2018-10-23 | 2018-10-23 | Coal gasification low-nitrogen combustor system for thermal power boiler |
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