Pulverized coal boiler with hydrogen, ammonia and coal cooperatively combusted

Abstract

The invention relates to the technical field of boilers, in particular to a pulverized coal boiler for synergic combustion of hydrogen, ammonia and coal, and solves the problems that when hydrogen, ammonia and pulverized coal are subjected to mixed combustion in an existing boiler, the mixing amount and the mixing degree of the hydrogen, the ammonia and the pulverized coal are inconvenient to control, so that the combustion effect is poor, ammonia residues are easily caused, and the environment is harmed during emission. Comprising a sectional type boiler main body and a secondary gas injection mechanism, a pulverized coal grading input mechanism is installed on the inner side of the front end of the sectional type boiler main body, the secondary gas injection mechanism is installed between the sectional type boiler main body and the pulverized coal grading input mechanism, and the secondary gas injection mechanism is composed of a hydrogen mixed flow mechanism and an ammonia mixed flow mechanism. The combustion efficiency of the ammonia gas is excited to reach the maximum value through mixed flow of the hydrogen and the ammonia gas, the combustion heat production capacity of the ammonia gas is effectively improved, meanwhile, emission of harmful substances of the ammonia gas can be reduced, pulverized coal and gas are mixed and pressurized, the pulverized coal is fully combusted in a combustion area, and the heat efficiency of the pulverized coal boiler is improved.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal. Background Art

[0002] Boilers generally use pulverized coal burners to ignite pulverized coal into the boiler. As the global demand for environmental protection and energy transformation continues to grow, the potential of hydrogen as a clean energy source is increasingly recognized. Hydrogen does not produce carbon dioxide during combustion and is an important means to achieve a low-carbon economy. However, the storage and transportation of hydrogen are still the main obstacles to its widespread application. In order to solve this problem, ammonia (NH3) has been widely studied as a hydrogen carrier. Ammonia has the advantages of high hydrogen content and easy liquefaction and storage. However, in the process of efficient utilization of ammonia, especially its combustion and decomposition technology, it still faces challenges.

[0003] When existing boilers use hydrogen, ammonia and pulverized coal for mixed combustion, the mixing amount and degree of the three are not easy to control, resulting in poor combustion effect and easy to cause ammonia residue, which harms the environment when discharged; therefore, it does not meet the existing needs. In this regard, we propose a pulverized coal boiler that synergizes the combustion of hydrogen, ammonia and coal. Summary of the invention

[0004] The purpose of the present invention is to provide a pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal, so as to solve the problem mentioned in the above background technology that when the existing boiler uses hydrogen, ammonia and pulverized coal for mixed combustion, it is difficult to control the mixing amount and mixing degree of the three, resulting in poor combustion effect and easy to cause ammonia residue, which harms the environment when discharged.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal, comprising a segmented boiler body and a secondary gas injection mechanism, a pulverized coal graded input mechanism is installed on the inner side of the front end of the segmented boiler body, a secondary gas injection mechanism is installed between the segmented boiler body and the pulverized coal graded input mechanism, the secondary gas injection mechanism is composed of a hydrogen mixing flow mechanism and an ammonia mixing flow mechanism, the hydrogen mixing flow mechanism is located in front of the ammonia mixing flow mechanism, and a residual detection mechanism is installed on the inner side of the rear end of the segmented boiler body;

[0006] The hydrogen mixing flow mechanism and the ammonia mixing flow mechanism both include a gas input pipe, a ring-shaped gas injection pipe is fixedly installed at the rear end of the gas input pipe, a plurality of conical conveying sleeves are arranged on the rear end face of the ring-shaped gas injection pipe, a magnetic drive mixing flow unit is installed on the inner side of the plurality of conical conveying sleeves, the magnetic drive mixing flow unit includes an annular connecting frame, a mounting retaining frame is installed on the outer side of the rear end of the annular connecting frame, a driving magnetic ring is installed on the outer side of the mounting retaining frame, an annular mixing flow frame is rotatably connected to the inside of the mounting retaining frame, and a plurality of arc-shaped magnetic blocks are installed between the annular mixing flow frame and the mounting retaining frame;

[0007] The hydrogen mixing mechanism also includes a hydrogen flow splitting hollow ring fixedly connected to one of the annular gas injection pipes, a front end surface of the hydrogen flow splitting hollow ring is provided with a plurality of first conical gas guide holes, and a rear end surface of the hydrogen flow splitting hollow ring is provided with a plurality of first connecting holes;

[0008] The ammonia mixing mechanism also includes an ammonia diversion hollow ring fixedly connected to another annular gas injection pipe, the front end surface of the ammonia diversion hollow ring is provided with a plurality of second conical air guide holes, and the rear end surface of the ammonia diversion hollow ring is provided with a plurality of second connecting holes.

[0009] Preferably, the segmented boiler body includes an injection and ignition pipe section, a plurality of oxygen input pipes are fixedly installed at the front end of the injection and ignition pipe section, a combustion acceleration pipe section is fixedly installed at the rear end of the injection and ignition pipe section, a diversion output pipe section is fixedly installed at the rear end of the combustion acceleration pipe section, a first combustion chamber is provided on the inner side of the rear end of the injection and ignition pipe section, a second combustion chamber is provided between the injection and ignition pipe section and the combustion acceleration pipe section, a third combustion chamber is provided on the inner side of the front end of the combustion acceleration pipe section, a first igniter is installed on the inner side of the first combustion chamber, a second igniter is installed on the inner side of the second combustion chamber, and a third igniter is installed on the inner side of the third combustion chamber, a first heat exchange curved tube is installed on the inner side of the middle part of the combustion acceleration pipe section, a second heat exchange curved tube is installed on the inner side of the first heat exchange curved tube, a variable diameter acceleration chamber is provided between the first heat exchange curved tube and the second heat exchange curved tube, and a heat exchange delivery pipe is fixedly installed on the rear end of the second heat exchange curved tube.

[0010] Preferably, the pulverized coal classification input mechanism comprises a pulverized coal conveying pipe, and a first flow diverter and a second flow diverter are fixedly mounted on the outer side of the rear end of the pulverized coal conveying pipe, and the first flow diverter is located in front of the second flow diverter.

[0011] Preferably, the residue detection mechanism includes a thermal insulation seat, the front end of the thermal insulation seat is fixedly provided with an arc-shaped inverted ring, the inner side of the front end of the thermal insulation seat is fixedly installed with a guide bend pipe, the inner side of the bottom end of the guide bend pipe is slidably connected with a conical sealing block, the rear end of the conical sealing block is installed with a transmission bent rod, a supporting spring is provided between the conical sealing block and the transmission bent rod, the upper end of the guide bend pipe is fixedly installed with a detection box, the front end of the detection box is fixedly installed with an electric push rod, the upper end surface of the detection box is provided with an exhaust port, and a plurality of detection probes are fixedly installed on the inner side of the upper end of the detection box.

[0012] Preferably, the hydrogen diversion hollow ring and the ammonia diversion hollow ring are both connected to the gas input pipe through an annular gas injection pipe, and the hydrogen diversion hollow ring and the ammonia diversion hollow ring are respectively connected to the conical conveying sleeve through the first connecting hole and the second connecting hole, and the first conical gas guide hole and the second conical gas guide hole respectively penetrate the hydrogen diversion hollow ring and the ammonia diversion hollow ring and are connected to the conical conveying sleeve.

[0013] Preferably, the first conical gas guide hole, the first connecting hole, the second conical gas guide hole, the second connecting hole and the conical conveying sleeve are all arranged circumferentially relative to the axis of the hydrogen diversion hollow ring, the first conical gas guide hole and the first connecting hole and the second conical gas guide hole and the second connecting hole are installed alternately, the first conical gas guide hole is coaxial with the second connecting hole, and the first connecting hole is coaxial with the second conical gas guide hole.

[0014] Preferably, the two mounting retainers are fixedly connected to the hydrogen diversion hollow ring and the ammonia diversion hollow ring through an annular connecting frame, the inner wall of the mounting retainer is in close contact with a plurality of arc-shaped magnetic blocks, the two mounting retainers are fixedly connected to the injection ignition tube section through a driving magnetic ring, the plurality of arc-shaped magnetic blocks are arranged in a circle relative to the axis of the annular mixing frame, a plurality of blades are fixedly provided on the inner side of the annular mixing frame, the blades in the two annular mixing frames are installed in opposite directions, and the rotation directions of the two annular mixing frames are opposite.

[0015] Preferably, the output end of the electric push rod passes through the detection box and is fixedly connected to the upper end of the transmission bent rod, the bottom end of the transmission bent rod passes through the diversion bent pipe and is slidably connected to the conical sealing block through a supporting spring, a limiting ring is provided on the inner side of the bottom end of the diversion bent pipe, the conical sealing block is in close contact with the rear end surface of the limiting ring, the detection box is connected to the inside of the diversion bent pipe, and a gas sensor is provided on the inner side of the detection probe, and the gas sensor is used to monitor the residual hydrogen and ammonia inside the detection box.

[0016] Preferably, the rear end of the pulverized coal conveying pipe passes through the injection ignition pipe section, the hydrogen diverter hollow ring and the ammonia diverter hollow ring in sequence and is fixedly connected to the front end of the second heat exchange curved tube. The first diverter is arranged between the first combustion chamber and the second combustion chamber, and the second diverter is arranged between the second combustion chamber and the third combustion chamber. The first diverter and the second diverter are both connected to the interior of the pulverized coal conveying pipe.

[0017] Preferably, a shut-off valve is provided inside the oxygen input pipe, the injection and ignition pipe section, the combustion acceleration pipe section and the diversion output pipe section are coaxial, the bottom ends of the first igniter, the second igniter and the third igniter pass through the injection and ignition pipe section and the combustion acceleration pipe section and are all provided with spark plugs, and the inner sides of the first heat exchange curved tube, the second heat exchange curved tube and the heat exchange delivery pipe are all filled with heat exchange medium.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention installs the first conical air guide hole and the first connecting hole and the second conical air guide hole and the second connecting hole alternately. The two gas input pipes respectively input hydrogen and ammonia into the inner side of the hydrogen shunting hollow ring and the ammonia shunting hollow ring through the annular gas injection pipe. The hydrogen shunting hollow ring and the ammonia shunting hollow ring can shun hydrogen and ammonia through a plurality of first connecting holes and second connecting holes respectively and transport them to the inside of the injection ignition pipe section through the conical conveying sleeve. During the hydrogen and ammonia input process, the two annular mixing frames drive the arc-shaped magnetic blocks to rotate in opposite directions on the inner side of the mounting retaining frame through the driving magnetic ring. The two magnetic drive mixing units can fully accelerate and mix hydrogen and ammonia to form a high-speed swirl.

[0020] 2. The present invention uses a first igniter to ignite a mixed gas flow formed by hydrogen and ammonia through a spark plug and performs preliminary combustion inside the first combustion chamber. The pulverized coal conveying pipe uses a first flow divider and a second flow divider to evenly output the pulverized coal twice and fully contact and burn with the mixed gas flow in the second combustion chamber and the inner side of the second combustion chamber to form a high-temperature gas flow. By mixing the pulverized coal twice, the difficulty of pulverized coal combustion can be reduced, the combustion effect of pulverized coal can be improved, and the waste of hydrogen and ammonia can be avoided. The high-temperature gas flow can be accelerated by a variable-diameter acceleration chamber, thereby effectively increasing the flow rate of the high-temperature gas flow and fully contacting with the surfaces of the first heat exchange curved tube and the second heat exchange curved tube, and heat exchange operation is performed on the high-temperature gas flow through a heat exchange medium.

[0021] 3. The present invention can intercept the high-temperature airflow by an arc-shaped inverted ring, start the electric push rod, and drive the transmission bent rod to move horizontally. The conical sealing block can be separated from the limit ring provided on the inner side of the bottom end of the guide bend under the pressurized action of the high-temperature airflow, and then part of the gas in the high-temperature airflow can be intercepted and guided to the inside of the detection box through the guide bend. The gas sensor can monitor the residual hydrogen and ammonia in the gas after combustion. When hydrogen and ammonia are residual, the two gas input pipes and the first diverter are controlled to control the mixed combustion effect of hydrogen, ammonia and coal powder. The guide bend can cool the high-temperature airflow through the temperature insulation seat when conveying, effectively extending the service life of the electric push rod and the detection probe and improving the detection accuracy of the detection probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of the present invention as a whole;

[0024] Figure 3 It is a structural schematic diagram of the two-stage gas injection mechanism of the present invention;

[0025] Figure 4 It is a schematic diagram of the installation structure of the conical air guide hole of the present invention;

[0026] Figure 5 For the present invention Figure 2 Schematic diagram of the enlarged structure of the A area in the middle;

[0027] Figure 6 It is a schematic diagram of the installation structure of the tapered conveying sleeve of the present invention;

[0028] Figure 7 It is a schematic diagram of the installation structure of the first connecting hole of the present invention;

[0029] Figure 8 It is a schematic diagram of the explosion structure of the magnetic drive mixed flow unit of the present invention;

[0030] Fig. 9 For the present invention Figure 2 Schematic diagram of the enlarged structure of area B in the middle.

[0031] In the figure: 1. Segmented boiler body; 101. Injection ignition pipe section; 102. Combustion acceleration pipe section; 103. Diversion output pipe section; 104. Oxygen input pipe; 105. First igniter; 106. Second igniter; 107. Third igniter; 108. First combustion chamber; 109. Second combustion chamber; 110. Third combustion chamber; 111. First heat exchange curved tube; 112. Second heat exchange curved tube; 113. Heat exchange conveying pipe; 114. Variable diameter acceleration chamber; 2. Coal powder classification input mechanism; 201. Coal powder conveying pipe; 202. First diverter; 203. Second diverter; 3. Secondary gas injection mechanism; 4. Residue detection mechanism; 401. Insulation seat; 402. Arc-shaped inverted ring; 403. Detection probe; 404, exhaust port; 405, electric push rod; 406, transmission bent rod; 407, guide bend pipe; 408, support spring; 409, conical blocking block; 410, detection box; 5, hydrogen mixing flow mechanism; 501, annular gas injection pipe; 502, hydrogen diversion hollow ring; 503, first conical gas guide hole; 504, magnetic drive mixed flow unit; 505, gas input pipe; 506, first connecting hole; 507, annular connecting frame; 508, annular mixed flow frame; 509, conical conveying sleeve; 510, arc-shaped magnetic block; 511, mounting retaining frame; 512, driving magnetic ring; 6, ammonia mixing flow mechanism; 601, ammonia diversion hollow ring; 602, second conical gas guide hole; 603, second connecting hole. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] The electric push rod 405 (model HTKC-35) mentioned in the present invention can be purchased from the market or obtained by private customization.

[0034] See also Figure 1 and Figure 2An embodiment of the present invention is as follows: a pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal, comprising a segmented boiler body 1 and a secondary gas injection mechanism 3, a pulverized coal graded input mechanism 2 is installed on the inner side of the front end of the segmented boiler body 1, a secondary gas injection mechanism 3 is installed between the segmented boiler body 1 and the pulverized coal graded input mechanism 2, the segmented boiler body 1 comprises an injection and ignition pipe section 101, a plurality of oxygen input pipes 104 are fixedly installed at the front end of the injection and ignition pipe section 101, a stop valve is arranged inside the oxygen input pipe 104, a combustion acceleration pipe section 102 is fixedly installed at the rear end of the injection and ignition pipe section 101, A guide output pipe section 103 is fixedly installed at the rear end of the combustion acceleration pipe section 102. The injection ignition pipe section 101, the combustion acceleration pipe section 102 and the guide output pipe section 103 are coaxial. A first combustion chamber 108 is provided on the inner side of the rear end of the injection ignition pipe section 101. A second combustion chamber 109 is provided between the injection ignition pipe section 101 and the combustion acceleration pipe section 102. A third combustion chamber 110 is provided on the inner side of the front end of the combustion acceleration pipe section 102. Three combustion operations can be achieved through the first combustion chamber 108, the second combustion chamber 109 and the third combustion chamber 110, which effectively improves the full combustion of hydrogen, ammonia and coal powder.

[0035] A first igniter 105 is installed inside the first combustion chamber 108, a second igniter 106 is installed inside the second combustion chamber 109, and a third igniter 107 is installed inside the third combustion chamber 110. The first igniter 105, the second igniter 106, and the third igniter 107 penetrate the injection ignition tube section 101 and the combustion acceleration tube section 102 and are all provided with spark plugs. The first igniter 105, the second igniter 106, and the third igniter 107 can perform three ignition operations, effectively avoiding the situation where combustion is interrupted.

[0036] A first heat exchange curved tube 111 is installed on the inner side of the middle part of the combustion acceleration tube section 102, and a second heat exchange curved tube 112 is installed on the inner side of the first heat exchange curved tube 111. A variable diameter acceleration cavity 114 is provided between the first heat exchange curved tube 111 and the second heat exchange curved tube 112, and a heat exchange delivery pipe 113 is fixedly installed on the rear end of the second heat exchange curved tube 112. The inner sides of the first heat exchange curved tube 111, the second heat exchange curved tube 112 and the heat exchange delivery pipe 113 are all filled with heat exchange medium. The variable diameter acceleration cavity 114 can be used to accelerate the high-temperature airflow, thereby effectively increasing the flow rate of the high-temperature airflow and fully contacting the surfaces of the first heat exchange curved tube 111 and the second heat exchange curved tube 112. The first heat exchange curved tube 111, the second heat exchange curved tube 112 and the heat exchange delivery pipe 113 can perform heat exchange operations on the high-temperature airflow through the heat exchange medium.

[0037] See also Figures 2 to 8The secondary gas injection mechanism 3 is composed of a hydrogen mixing mechanism 5 and an ammonia mixing mechanism 6. The hydrogen mixing mechanism 5 is located in front of the ammonia mixing mechanism 6. The hydrogen mixing mechanism 5 and the ammonia mixing mechanism 6 both include a gas input pipe 505. An annular gas injection pipe 501 is fixedly installed at the rear end of the gas input pipe 505. The rear end surface of the annular gas injection pipe 501 has a plurality of conical conveying sleeves 509. The plurality of conical conveying sleeves 509 can evenly convey hydrogen and ammonia.

[0038] A magnetic drive mixed flow unit 504 is installed on the inner side of multiple conical conveying sleeves 509. The magnetic drive mixed flow unit 504 includes an annular connecting frame 507. A mounting retaining frame 511 is installed on the outer side of the rear end of the annular connecting frame 507. A driving magnetic ring 512 is installed on the outer side of the mounting retaining frame 511. The inner side of the mounting retaining frame 511 is rotatably connected to an annular mixed flow frame 508. Multiple arc-shaped magnetic blocks 510 are installed between the annular mixed flow frame 508 and the mounting retaining frame 511. The two mounting retaining frames 511 are connected to the hydrogen diversion hollow ring 502 and the ammonia diversion hollow ring 60 through the annular connecting frame 507. 1 is fixedly connected, the inner wall of the mounting holder 511 is in close contact with the plurality of arc-shaped magnetic blocks 510, the two mounting holders 511 are fixedly connected to the injection ignition tube section 101 through the driving magnetic ring 512, the plurality of arc-shaped magnetic blocks 510 are arranged in a circle relative to the axis of the annular mixing frame 508, a plurality of blades are fixedly arranged on the inner side of the annular mixing frame 508, the blades in the two annular mixing frames 508 are installed in opposite directions, and the rotation directions of the two annular mixing frames 508 are opposite, and the two magnetic drive mixing units 504 can fully accelerate and mix the hydrogen and ammonia to form a high-speed vortex.

[0039] See also Figures 3 to 8 The hydrogen mixing mechanism 5 also includes a hydrogen splitting hollow ring 502 fixedly connected to one of the annular gas injection pipes 501, the front end surface of the hydrogen splitting hollow ring 502 is provided with a plurality of first conical gas guide holes 503, and the rear end surface of the hydrogen splitting hollow ring 502 is provided with a plurality of first connecting holes 506, and the ammonia mixing mechanism 6 also includes an ammonia splitting hollow ring 601 fixedly connected to another annular gas injection pipe 501, the front end surface of the ammonia splitting hollow ring 601 is provided with a plurality of second conical gas guide holes 602, and the rear end surface of the ammonia splitting hollow ring 601 is provided with A plurality of second connecting holes 603, the hydrogen splitting hollow ring 502 and the ammonia splitting hollow ring 601 are both connected to the gas input pipe 505 through the annular gas injection pipe 501, the hydrogen splitting hollow ring 502 and the ammonia splitting hollow ring 601 are respectively connected to the conical conveying sleeve 509 through the first connecting hole 506 and the second connecting hole 603, the hydrogen splitting hollow ring 502 and the ammonia splitting hollow ring 601 can split the hydrogen and ammonia through the plurality of first connecting holes 506 and the second connecting hole 603 and convey them through the conical conveying sleeve 509;

[0040] The first conical gas guide hole 503 and the second conical gas guide hole 602 respectively penetrate the hydrogen diversion hollow ring 502 and the ammonia diversion hollow ring 601 and are connected with the conical conveying sleeve 509. The first conical gas guide hole 503, the first connecting hole 506, the second conical gas guide hole 602, the second connecting hole 603 and the conical conveying sleeve 509 are all arranged in a circle relative to the axis of the hydrogen diversion hollow ring 502. The first conical gas guide hole 503 and the first connecting hole 506 and the second conical gas guide hole 602 and the second connecting hole 603 are installed alternately. The first conical gas guide hole 503 and the second connecting hole 603 are coaxial, and the first connecting hole 506 and the second conical gas guide hole 602 are coaxial. The gas inside the injection ignition tube section 101 can be axially conveyed through the first conical gas guide hole 503 and the second conical gas guide hole 602, so as to facilitate the mixing of hydrogen and ammonia.

[0041] See also Figure 2 The pulverized coal grading input mechanism 2 includes a pulverized coal conveying pipe 201, and a first diverter 202 and a second diverter 203 are fixedly installed on the outer side of the rear end of the pulverized coal conveying pipe 201. The first diverter 202 is located in front of the second diverter 203. The rear end of the pulverized coal conveying pipe 201 passes through the injection ignition pipe section 101, the hydrogen diverter hollow ring 502 and the ammonia diverter hollow ring 601 in sequence and is fixedly connected to the front end of the second heat exchange curved tube 112. The first diverter 202 is arranged between the first combustion chamber 108 and the second combustion chamber 109, and the second diverter 203 is arranged between the second combustion chamber 109 and the third combustion chamber 110. The first diverter 202 and the second diverter 203 are both connected to the inside of the pulverized coal conveying pipe 201. By mixing the pulverized coal twice, the difficulty of pulverized coal combustion can be reduced, the combustion effect of pulverized coal can be improved, and the waste of hydrogen and ammonia can be avoided.

[0042] See also Figure 2 and Fig. 9 A residue detection mechanism 4 is installed on the inner side of the rear end of the sectional boiler body 1, and the residue detection mechanism 4 includes a thermal insulation seat 401, and an arc-shaped inverted ring 402 is fixedly provided at the front end of the thermal insulation seat 401, and a guide elbow 407 is fixedly installed on the inner side of the front end of the thermal insulation seat 401, and a conical blocking block 409 is slidably connected to the inner side of the guide elbow 407, and a limiting ring is provided on the inner side of the guide elbow 407, and the conical blocking block 409 is in close contact with the rear end surface of the limiting ring, and a transmission bent rod 406 is installed at the rear end of the conical blocking block 409, and a support spring 408 is provided between the conical blocking block 409 and the transmission bent rod 406, and the transmission bent rod 406 passes through the guide elbow 407 and is slidably connected to the conical blocking block 409 through the support spring 408, and the support spring 408 can maintain the sealing contact between the conical blocking block 409 and the limiting ring under the support of the transmission bent rod 406 to avoid gas leakage;

[0043] A detection box 410 is fixedly installed on the upper end of the diversion bend 407, and the detection box 410 is connected to the inside of the diversion bend 407. An electric push rod 405 is fixedly installed on the front end of the detection box 410. The output end of the electric push rod 405 passes through the detection box 410 and is fixedly connected to the upper end of the transmission bend 406. An exhaust port 404 is provided on the upper end surface of the detection box 410. A plurality of detection probes 403 are fixedly installed on the inner side of the upper end of the detection box 410. A gas sensor is provided on the inner side of the detection probe 403. The gas sensor is used to monitor the residual hydrogen and ammonia inside the detection box 410, so that the electric push rod 405 drives the transmission bent rod 406 to move horizontally, and the conical blocking block 409 can be separated from the limit ring provided on the inner side of the guide bend 407 under the pressurized action of the high-temperature airflow, and then part of the gas in the high-temperature airflow can be intercepted and guided to the inside of the detection box 410 through the guide bend 407, and the residual hydrogen and ammonia in the post-combustion gas can be monitored by the gas sensor.

[0044] When in use, when using the segmented boiler body 1 to burn pulverized coal, the secondary gas injection mechanism 3 is installed on the inner side of the middle part of the injection ignition pipe section 101, specifically, a plurality of first conical gas guide holes 503, a first connecting hole 506, a second conical gas guide hole 602, a second connecting hole 603 and a conical conveying sleeve 509 are all arranged in a circle relative to the axis of the hydrogen diversion hollow ring 502, and the first conical gas guide hole 503 and the first connecting hole 506 and the second conical gas guide hole 602 and the second connecting hole 603 are installed alternately, the first conical gas guide hole 503 and the second connecting hole 603 are coaxial, the first connecting hole 506 and the second conical gas guide hole 602 are coaxial, and the two gas input pipes 505 are respectively used to input hydrogen and ammonia into the inner sides of the hydrogen diversion hollow ring 502 and the ammonia diversion hollow ring 601 through the annular gas injection pipe 501;

[0045] At this time, the hydrogen split hollow ring 502 and the ammonia split hollow ring 601 can split the hydrogen and ammonia through the multiple first connecting holes 506 and the second connecting holes 603 respectively and transport them to the inside of the injection and ignition pipe section 101 through the conical conveying sleeve 509. The first conical air guide hole 503 and the second conical air guide hole 602 respectively penetrate the hydrogen split hollow ring 502 and the ammonia split hollow ring 601 and are connected to the conical conveying sleeve 509, and then the gas inside the injection and ignition pipe section 101 can be axially transported through the first conical air guide hole 503 and the second conical air guide hole 602. The two magnetic drive mixed flow units 504 are fixedly installed at the rear ends of the two annular connecting frames 507;

[0046] The power is turned on, so that during the input of hydrogen and ammonia, the two annular flow mixing racks 508 drive the arc-shaped magnetic block 510 to rotate in opposite directions on the inner side of the mounting holder 511 through the driving magnetic ring 512. A plurality of blades are fixedly provided on the inner side of the annular flow mixing rack 508, and the blades in the two annular flow mixing racks 508 are installed in opposite directions, so that the hydrogen and ammonia can be fully accelerated and mixed through the two magnetic drive flow mixing units 504 to form a high-speed swirl.

[0047] Hydrogen and ammonia are mixed in front of 108 and ignited at 108, and the mixed gas in a high-speed swirling state is continuously transported, thereby delaying the combustion position of the mixed gas and increasing the distance between the combustion position and 504. At the same time, 504 can be continuously kept warm by the mixed gas to avoid being affected by the heat generated by the combustion.

[0048] Spark plugs are provided in the first igniter 105, the second igniter 106 and the third igniter 107, so that the first igniter 105 can ignite the mixed gas flow formed by hydrogen and ammonia through the spark plug and perform preliminary combustion in the first combustion chamber 108. The first flow divider 202 and the second flow divider 203 are respectively installed between the second combustion chamber 109 and the first combustion chamber 108 and the third combustion chamber 110, and the first flow divider 202 and the second flow divider 203 are both connected to the coal powder conveying pipe 201, so that the coal powder is The pulverized coal conveying pipe 201 can evenly output the pulverized coal for the first time through the first flow divider 202 and fully contact and burn with the mixed airflow inside the second combustion chamber 109. When the airflow is then transported to the third combustion chamber 110, the pulverized coal conveying pipe 201 can evenly output the pulverized coal for the second time through the second flow divider 203 and fully contact and burn with the mixed airflow again to form a high-temperature airflow. By mixing the pulverized coal twice, the difficulty of pulverized coal combustion can be reduced, the combustion effect of pulverized coal can be improved, and the waste of hydrogen and ammonia can be avoided.

[0049] A variable diameter acceleration chamber 114 is provided between the first heat exchange curved tube 111 and the second heat exchange curved tube 112, so that the variable diameter acceleration chamber 114 can accelerate the high temperature airflow, thereby effectively increasing the flow rate of the high temperature airflow and fully contacting with the surfaces of the first heat exchange curved tube 111 and the second heat exchange curved tube 112. The first heat exchange curved tube 111, the second heat exchange curved tube 112 and the heat exchange delivery tube 113 are all filled with heat exchange medium, so that the first heat exchange curved tube 111, the second heat exchange curved tube 112 and the heat exchange delivery tube 113 can perform heat exchange operation on the high temperature airflow through the heat exchange medium. An arc-shaped inverted ring 402 is fixedly provided at the front end of the temperature insulation seat 401. When the high temperature airflow is transported to the inner side of the guide output pipe section 103, the high temperature airflow can be inverted and intercepted by the arc-shaped inverted ring 402;

[0050] The electric push rod 405 is started, so that the electric push rod 405 drives the transmission bent rod 406 to move horizontally under the support of the detection box 410, and then the support spring 408 is extended. The conical blocking block 409 can be separated from the limit ring provided on the inner side of the guide bend 407 under the pressurized action of the high-temperature airflow, and then part of the gas in the high-temperature airflow can be intercepted and guided to the inside of the detection box 410 through the guide bend 407. A gas sensor is provided on the inner side of the detection probe 403, and the hydrogen and ammonia remaining in the gas after combustion can be monitored by the gas sensor. When hydrogen and ammonia remain, the two gas input pipes 505 and the first diverter 202 are controlled to control the mixed combustion effect of hydrogen, ammonia and coal powder. The guide bend 407 can cool down the high-temperature airflow through the temperature insulation seat 401 when conveying, effectively extending the service life of the electric push rod 405 and the detection probe 403 and improving the detection accuracy of the detection probe 403.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal, comprising a segmented boiler body (1) and a secondary gas injection mechanism (3), characterized in that: A pulverized coal classification input mechanism (2) is installed on the inner side of the front end of the sectional boiler body (1); a secondary gas injection mechanism (3) is installed between the sectional boiler body (1) and the pulverized coal classification input mechanism (2); the secondary gas injection mechanism (3) is composed of a hydrogen mixing mechanism (5) and an ammonia mixing mechanism (6); the hydrogen mixing mechanism (5) is located in front of the ammonia mixing mechanism (6); and a residue detection mechanism (4) is installed on the inner side of the rear end of the sectional boiler body (1); The hydrogen mixing mechanism (5) and the ammonia mixing mechanism (6) both comprise a gas input pipe (505), a ring-shaped gas injection pipe (501) being fixedly mounted at the rear end of the gas input pipe (505), a plurality of conical conveying sleeves (509) being mounted on the rear end face of the ring-shaped gas injection pipe (501), a magnetic drive mixing unit (504) being mounted on the inner side of the plurality of conical conveying sleeves (509), the magnetic drive mixing unit (504) comprising a ring-shaped connecting frame (507), a mounting retaining frame (511) being mounted on the outer side of the rear end of the ring-shaped connecting frame (507), a driving magnetic ring (512) being mounted on the outer side of the mounting retaining frame (511), a ring-shaped mixing frame (508) being rotatably connected to the interior of the mounting retaining frame (511), a plurality of arc-shaped magnetic blocks (510) being mounted between the ring-shaped mixing frame (508) and the mounting retaining frame (511).

2. A pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 1, characterized in that: The hydrogen mixing mechanism (5) further comprises a hydrogen flow splitting hollow ring (502) fixedly connected to one of the annular gas injection pipes (501), a front end surface of the hydrogen flow splitting hollow ring (502) being provided with a plurality of first conical gas guide holes (503), and a rear end surface of the hydrogen flow splitting hollow ring (502) being provided with a plurality of first connecting holes (506); The ammonia mixing mechanism (6) further comprises an ammonia flow splitting hollow ring (601) fixedly connected to another annular gas injection pipe (501), the front end surface of the ammonia flow splitting hollow ring (601) being provided with a plurality of second conical gas guide holes (602), and the rear end surface of the ammonia flow splitting hollow ring (601) being provided with a plurality of second connecting holes (603).

3. A pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 2, characterized in that: The segmented boiler body (1) comprises an injection and ignition pipe section (101), a plurality of oxygen input pipes (104) are fixedly installed at the front end of the injection and ignition pipe section (101), a combustion acceleration pipe section (102) is fixedly installed at the rear end of the injection and ignition pipe section (101), a flow guide output pipe section (103) is fixedly installed at the rear end of the combustion acceleration pipe section (102), a first combustion chamber (108) is provided on the inner side of the rear end of the injection and ignition pipe section (101), a second combustion chamber (109) is provided between the injection and ignition pipe section (101) and the combustion acceleration pipe section (102), and a third combustion chamber (110) is provided on the inner side of the front end of the combustion acceleration pipe section (102). A first igniter (105) is installed on the inner side of the first combustion chamber (108), a second igniter (106) is installed on the inner side of the second combustion chamber (109), a third igniter (107) is installed on the inner side of the third combustion chamber (110), a first heat exchange curved tube (111) is installed on the inner side of the middle part of the combustion acceleration tube section (102), a second heat exchange curved tube (112) is installed on the inner side of the first heat exchange curved tube (111), a variable diameter acceleration chamber (114) is provided between the first heat exchange curved tube (111) and the second heat exchange curved tube (112), and a heat exchange delivery tube (113) is fixedly installed at the rear end of the second heat exchange curved tube (112); A stop valve is provided inside the oxygen input pipe (104); the injection ignition pipe section (101), the combustion acceleration pipe section (102) and the diversion output pipe section (103) are coaxial; the bottom ends of the first igniter (105), the second igniter (106) and the third igniter (107) penetrate the injection ignition pipe section (101) and the combustion acceleration pipe section (102) and are all provided with spark plugs; the inner sides of the first heat exchange curved tube (111), the second heat exchange curved tube (112) and the heat exchange delivery pipe (113) are all filled with heat exchange medium.

4. A pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 2, characterized in that: The pulverized coal classification input mechanism (2) comprises a pulverized coal conveying pipe (201), a first flow divider (202) and a second flow divider (203) being fixedly mounted on the outer side of the rear end of the pulverized coal conveying pipe (201), and the first flow divider (202) is located in front of the second flow divider (203).

5. The pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 2 is characterized by: The residue detection mechanism (4) comprises a temperature insulation seat (401), the front end of which is fixedly provided with an arc-shaped inverted buckle ring (402), the inner side of the front end of the temperature insulation seat (401) is fixedly provided with a guide bend pipe (407), the inner side of the bottom end of the guide bend pipe (407) is slidably connected with a conical blocking block (409), the rear end of the conical blocking block (409) is provided with a transmission bent rod (406), a support spring (408) is provided between the conical blocking block (409) and the transmission bent rod (406), the upper end of the guide bend pipe (407) is fixedly provided with a detection box (410), the front end of the detection box (410) is fixedly provided with an electric push rod (405), the upper end surface of the detection box (410) is provided with an exhaust port (404), and the inner side of the upper end of the detection box (410) is fixedly provided with a plurality of detection probes (403).

6. A pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 3, characterized in that: The hydrogen split hollow ring (502) and the ammonia split hollow ring (601) are both connected to the gas input pipe (505) through the annular gas injection pipe (501); the hydrogen split hollow ring (502) and the ammonia split hollow ring (601) are connected to the conical conveying sleeve (509) through the first connecting hole (506) and the second connecting hole (603), respectively; the first conical gas guide hole (503) and the second conical gas guide hole (602) respectively penetrate the hydrogen split hollow ring (502) and the ammonia split hollow ring (601) and are connected to the conical conveying sleeve (509).

7. A pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 6, characterized in that: The first conical gas guide hole (503), the first connecting hole (506), the second conical gas guide hole (602), the second connecting hole (603) and the conical conveying sleeve (509) are all arranged in a circle relative to the axis of the hydrogen diversion hollow ring (502); the first conical gas guide hole (503) and the first connecting hole (506) and the second conical gas guide hole (602) and the second connecting hole (603) are installed alternately; the first conical gas guide hole (503) and the second connecting hole (603) are coaxial; and the first connecting hole (506) and the second conical gas guide hole (602) are coaxial.

8. A pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 7, characterized in that: The two mounting retainers (511) are fixedly connected to the hydrogen diversion hollow ring (502) and the ammonia diversion hollow ring (601) through the annular connecting frame (507); the inner wall of the mounting retainer (511) is in close contact with the plurality of arc-shaped magnetic blocks (510); the two mounting retainers (511) are fixedly connected to the injection ignition tube section (101) through the driving magnetic ring (512); the plurality of arc-shaped magnetic blocks (510) are arranged in a circle relative to the axis of the annular mixing frame (508); a plurality of blades are fixedly provided on the inner side of the annular mixing frame (508); the blades in the two annular mixing frames (508) are installed in opposite directions; and the rotation directions of the two annular mixing frames (508) are opposite.

9. The pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 5, characterized in that: The output end of the electric push rod (405) passes through the detection box (410) and is fixedly connected to the upper end of the transmission curved rod (406); the bottom end of the transmission curved rod (406) passes through the diversion curved pipe (407) and is slidably connected to the conical blocking block (409) via a support spring (408); a limiting ring is provided on the inner side of the bottom end of the diversion curved pipe (407); the conical blocking block (409) is in close contact with the rear end surface of the limiting ring; the detection box (410) is connected to the inside of the diversion curved pipe (407); a gas sensor is provided on the inner side of the detection probe (403); the gas sensor is used to monitor the residual hydrogen and ammonia inside the detection box (410).

10. A pulverized coal boiler for the coordinated combustion of hydrogen, ammonia and coal according to claim 4, characterized in that: The rear end of the pulverized coal conveying pipe (201) sequentially passes through the injection ignition pipe section (101), the hydrogen diversion hollow ring (502) and the ammonia diversion hollow ring (601) and is fixedly connected to the front end of the second heat exchange curved tube (112); the first diverter (202) is arranged between the first combustion chamber (108) and the second combustion chamber (109); the second diverter (203) is arranged between the second combustion chamber (109) and the third combustion chamber (110); the first diverter (202) and the second diverter (203) are both connected to the inside of the pulverized coal conveying pipe (201).

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