Wide-load denitration device for boiler

Abstract

The invention belongs to the technical field of boilers, and particularly relates to a boiler wide-load denitration device which comprises a boiler exhaust pipe, the output end of the boiler exhaust pipe is communicated with a denitration device, one end of the boiler exhaust pipe is sequentially communicated with a conveying device and a gas storage tank through a gas tank gas inlet pipe, and low-temperature waste gas exhausted by a boiler is stored through the gas storage tank. When the temperature of the waste gas exhausted by the boiler meets the requirement that the denitration device works normally, the gas tank gas inlet pipe is closed, the low-temperature waste gas stored in the gas tank returns to the boiler gas exhaust pipe through the gas tank gas exhaust pipe, the low-temperature waste gas exhausted by the boiler is temporary, and the exhausted waste gas amount is not too large, so that the waste gas in the stage is temporarily stored, and the denitration device works normally. And after the temperature of the boiler is increased, the stored low-temperature waste gas is gradually mixed with the high-temperature waste gas, so that efficient operation of the denitration device can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to a boiler wide-load denitration device. Background Art

[0002] In the normal load operation of the boiler, it generally refers to the boiler operating at 70% to 100% of the rated load. At this time, parameters such as flue gas temperature and flow are relatively stable. Under this condition, the denitrification device can operate stably to perform denitrification work. However, when the boiler is just started, or the boiler is working at a low load (such as operating at 30% to 70% of the rated load, that is, wide load, covering a wider load range), the flue gas temperature discharged from the boiler is relatively low. The drop in flue gas temperature will affect the efficiency of the selective catalytic reduction (SCR) reaction, and the denitrification device cannot maintain an efficient NOx removal rate, resulting in a decrease in the performance of the denitrification device or unstable operation, which will discharge harmful gases. Summary of the invention

[0003] To solve the problems raised in the above background technology, the present invention provides a boiler wide load denitration device, which can achieve efficient operation of the denitration device by temporarily storing low-temperature exhaust gas and gradually mixing the stored low-temperature exhaust gas with high-temperature exhaust gas after the boiler temperature is increased.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a boiler wide-load denitrification device, comprising a boiler exhaust pipe, wherein the output end of the boiler exhaust pipe is connected to the denitrification device, and one end of the boiler exhaust pipe is connected to a conveying device and a gas storage tank in sequence through a gas tank air inlet pipe. The low-temperature exhaust gas discharged from the boiler is stored through the gas storage tank. When the temperature of the exhaust gas discharged from the boiler meets the normal operation of the denitrification device, the gas tank air inlet pipe is closed, and the low-temperature exhaust gas stored in the gas storage tank is returned to the boiler exhaust pipe through the gas tank exhaust pipe.

[0005] As a preferred boiler wide load denitration device of the present invention, the boiler exhaust pipe is connected to the gas tank air inlet pipe, and a buffer shell is connected to the gas tank air inlet pipe between the boiler exhaust pipe and the conveying device.

[0006] As a preferred boiler wide-load denitration device of the present invention, a one-way valve and / or a control valve is provided at the gas tank air inlet pipe between the boiler exhaust pipe and the buffer shell.

[0007] As a preferred embodiment of a boiler wide-load denitration device of the present invention, a second one-way valve is provided at the gas tank air inlet pipe between the conveying device and the gas storage tank.

[0008] As a preferred boiler wide-load denitrification device of the present invention, a gas tank exhaust pipe is connected between the gas storage tank and the boiler exhaust pipe, a first control valve is installed at one end of the gas tank exhaust pipe, and a second control valve is provided at the boiler exhaust pipe between the gas tank exhaust pipe and the gas tank air inlet pipe.

[0009] As a preferred boiler wide-load denitrification device of the present invention, the conveying device includes an annular shell and two movable bodies sliding inside the annular shell, the air inlet end and the exhaust end of the annular shell are both connected to the air inlet pipe of the gas tank, and the two movable bodies compress the gas in the annular shell and convey it to the gas storage tank by moving.

[0010] As a preferred boiler wide-load denitrification device of the present invention, the movable body includes a connecting body and a piston head fixed at both ends of the connecting body, the diameter of the connecting body is smaller than the diameter of the piston head, the inner side of the connecting body is rotatably connected to a roller for driving the movable body to move, the roller is rollingly connected to the inner wall surface of the annular shell, one end of the roller is coaxially fixedly connected to a sprocket, and the sprocket is connected to a driving device installed on the inner side of the connecting body through a chain.

[0011] As a preferred embodiment of a boiler wide load denitration device of the present invention, when the two movable bodies are respectively located at the first stop position and the second stop position, the position where the two movable bodies contact each other is located at the exhaust end of the annular shell.

[0012] As a preferred boiler wide load denitration device of the present invention, when the movable body for moving and squeezing gas is in the stop position, an arc-shaped rack movable relative to the annular shell is arranged between the two piston heads of the movable body, and the arc-shaped rack is rotatably connected to the annular shell through a connecting plate, and a receiving groove for receiving the arc-shaped rack is arranged on the inner side of one end of the annular shell, and a spring piece is installed between the inner wall surface of the receiving groove and the inner arc surface of the arc-shaped rack, and a guide surface is arranged at one end of the arc-shaped rack, and a gear is coaxially fixedly connected to one end of the roller, and the gear is used to mesh with the arc-shaped rack;

[0013] When the gear is meshed with the arc-shaped rack, the arc-shaped rack does not contact the piston head.

[0014] As a preferred embodiment of a boiler wide load denitration device of the present invention, a biaxial telescopic rod is fixedly connected to the inner side of the connecting body, the end of the movable shaft of the biaxial telescopic rod is fixedly connected to a limiting block, and an inclined groove is provided at the first stop position of the annular shell. When the movable body is located at the first stop position, the cooperation between the inclined groove and the limiting block can limit the position of the movable body;

[0015] A proximity switch is fixedly connected to the inner side of the connecting body, and a sensing body cooperating with the proximity switch is fixedly installed on the inclined surface of the inclined groove;

[0016] An annular conductive member is fixedly connected to the inner side of one end of the annular shell, one end of the annular conductive member is electrically connected to an external power supply through a cable, and a conductive sheet for connecting electricity is fixedly installed at one end of the connecting body, and the conductive sheet and the annular conductive member are slidably connected to electricity.

[0017] Compared with the prior art, the beneficial effects of the present invention are: Generally speaking, due to peak-shaving needs, equipment failure or maintenance phase, limited fuel supply and startup phase, the boiler will operate under wide load conditions. That is to say, under normal circumstances, the low-temperature exhaust gas discharged by the boiler is only temporary, and the amount of exhaust gas discharged will not be too large. Therefore, by temporarily storing the exhaust gas at this stage, and waiting until the boiler temperature is raised, the stored low-temperature exhaust gas is gradually mixed with the high-temperature exhaust gas, thereby achieving efficient operation of the denitrification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 A cross-sectional view of the connection structure of the annular shell in the present invention;

[0021] Figure 3 It is a schematic diagram of the docking structure of two movable bodies in the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the movable body in the present invention;

[0023] Figure 5 It is a schematic diagram of the connection structure of the gears in the present invention;

[0024] Figure 6 A schematic diagram of the connection position of the proximity switch in the present invention;

[0025] Figure 7 It is a schematic diagram of the extension structure of the arc-shaped rack in the present invention;

[0026] Figure 8 It is a schematic diagram of the retracted structure of the arc-shaped rack in the present invention;

[0027] Fig. 9 Schematic diagram of the installation structure of the double-axis telescopic rod in the present invention;

[0028] Fig.10 It is a schematic diagram of the running state of the movable body in the present invention;

[0029] Fig.11 It is a structural cross-sectional view of the chute in the present invention;

[0030] In the figure:

[0031] 1. Boiler exhaust pipe; 2. Conveying device; 3. Gas storage tank; 4. Gas tank exhaust pipe; 5. Gas tank air inlet pipe;

[0032] 6. First one-way valve; 7. Second one-way valve; 8. First control valve; 9. Second control valve;

[0033] 10. Buffer shell;

[0034] 21. annular housing; 22. movable body; 23. first stop position; 24. second stop position; 25. inclined groove; 26. arc-shaped rack; 27. connecting plate; 28. spring piece; 29. ​​guide surface;

[0035] 2101, annular conductive member; 2102, cable; 2103, inductor;

[0036] 2201, piston head; 2202, connecting body; 2203, roller; 2204, sprocket; 2205, chain; 2206, gear; 2207, double-axis telescopic rod; 2208, limit block; 2209, conductive sheet; 2210, proximity switch; DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0038] like Figure 1-Figure 11 As shown:

[0039] A boiler wide load denitration device comprises a boiler exhaust pipe 1, the output end of the boiler exhaust pipe 1 is connected to the denitration device, one end of the boiler exhaust pipe 1 is connected to a conveying device 2 and a gas storage tank 3 in sequence through a gas tank air inlet pipe 5, and the low-temperature exhaust gas discharged from the boiler is stored in the gas storage tank 3. When the temperature of the exhaust gas discharged from the boiler meets the normal operation of the denitration device, the gas tank air inlet pipe 5 is closed, and the low-temperature exhaust gas stored in the gas storage tank 3 is returned to the boiler exhaust pipe 1 through the gas tank exhaust pipe 4.

[0040] In this embodiment, in the normal load operation of the boiler, it generally refers to the boiler operating at 70% to 100% of the rated load. At this time, the flue gas temperature, flow rate and other parameters are relatively stable. Under this condition, the denitrification device can stably operate to perform denitrification work. However, when the boiler is just started, or the boiler is operating at a low load (such as operating at 30% to 70% of the rated load, that is, a wide load, covering a wider load range), the flue gas temperature discharged from the boiler is relatively low. The decrease in flue gas temperature will affect the efficiency of the selective catalytic reduction (SCR) reaction, and the denitrification device cannot maintain an efficient NOx removal rate, thereby causing the performance of the denitrification device to decrease or the operation to be unstable, and harmful gases will be discharged;

[0041] Generally speaking, due to peak-shaving needs, equipment failure or maintenance phase, limited fuel supply and startup phase, the boiler will operate under wide load conditions. That is to say, under normal circumstances, the low-temperature exhaust gas discharged by the boiler is only temporary and the amount of exhaust gas discharged will not be too large. Therefore, by temporarily storing the exhaust gas at this stage and waiting until the boiler temperature rises, the stored low-temperature exhaust gas will be gradually mixed with the high-temperature exhaust gas, thereby achieving efficient operation of the denitrification device.

[0042] In an optional embodiment, the boiler exhaust pipe 1 is connected to the gas tank air inlet pipe 5 , and a buffer shell 10 is connected to the gas tank air inlet pipe 5 between the boiler exhaust pipe 1 and the conveying device 2 .

[0043] In this embodiment, when storing the exhaust gas discharged from the boiler, it is necessary to transport the gas in the boiler exhaust pipe 1 to the gas storage tank 3 through the gas tank inlet pipe 5. When the gas pressure inside the gas storage tank 3 is relatively high, the conveying device 2 will cause the gas pressure at the air inlet end of the conveying device 2 to fluctuate when performing gas conveying work. Since the buffer shell 10 has a large accommodating space, the fluctuation will be reduced in the buffer shell 10, which is beneficial to the stable discharge of the boiler gas.

[0044] In an optional embodiment, a one-way valve and / or a control valve is provided at the gas tank air inlet pipe 5 between the boiler exhaust pipe 1 and the buffer shell 10 .

[0045] In this embodiment, for example, a first one-way valve 6 is provided at the gas tank air inlet pipe 5 between the boiler exhaust pipe 1 and the buffer shell 10. This can reduce the air pressure fluctuation in the buffer shell 10 and further reduce the influence of the air pressure fluctuation on the gas pressure in the boiler exhaust pipe 1. If a control valve is provided at the gas tank air inlet pipe 5 between the boiler exhaust pipe 1 and the buffer shell 10, the passage and disconnection of the pipeline can be controlled. Of course, when the second one-way valve 7 is provided, the control valve may not be provided in this part.

[0046] In an optional embodiment, a second one-way valve 7 is provided at the gas tank air inlet pipe 5 between the conveying device 2 and the gas storage tank 3 .

[0047] In this embodiment, the second one-way valve 7 can prevent the high-pressure gas stored in the gas storage tank 3 from flowing back into the gas tank intake pipe 5 .

[0048] In an optional embodiment, a gas tank exhaust pipe 4 is connected between the gas storage tank 3 and the boiler exhaust pipe 1, a first control valve 8 is installed at one end of the gas tank exhaust pipe 4, and a second control valve 9 is provided at the boiler exhaust pipe 1 between the gas tank exhaust pipe 4 and the gas tank air inlet pipe 5.

[0049] In this embodiment, when the exhaust gas in the boiler exhaust pipe 1 needs to be transported to the gas storage tank 3, the first control valve 8 and the second control valve 9 are closed. Figure 1 As shown, the exhaust gas in the boiler exhaust pipe 1 will enter the gas tank 3 after passing through the buffer shell 10 and the conveying device 2 in sequence under the connection with the gas tank inlet pipe 5. When it is necessary to stop conveying gas to the gas tank 3, open the first control valve 8 and the second control valve 9. Affected by the second one-way valve 7, the gas in the gas tank 3 cannot enter the gas tank inlet pipe 5, and the gas in the boiler exhaust pipe 1 can be transported to the denitrification device. At the same time, the exhaust gas inside the gas tank 3 can be transported to the boiler exhaust pipe 1 through the gas tank exhaust pipe 4, so as to achieve the mixing of the low-temperature exhaust gas in the gas tank 3 and the high-pressure exhaust gas in the boiler exhaust pipe 1. Of course, the exhaust volume of the gas tank 3 per unit time needs to be controlled according to the exhaust gas volume in the boiler exhaust pipe 1 and the exhaust gas temperature.

[0050] In an optional embodiment, the conveying device 2 includes an annular shell 21 and two movable bodies 22 sliding inside the annular shell 21. The air inlet end and the exhaust end of the annular shell 21 are both connected to the gas tank air inlet pipe 5. The two movable bodies 22 compress the gas in the annular shell 21 and convey it to the gas storage tank 3 by moving.

[0051] In this embodiment, the amount of waste gas generated varies according to the size of the boiler. For large boilers, the amount of waste gas generated is relatively large. Traditional compressors that can work at high temperatures are mainly divided into three types, namely centrifugal compressors, reciprocating compressors and screw compressors. Among them, the screw compressor has a moderate flow range, generally from a few cubic meters to tens of cubic meters per second, and a pressure range usually below a few MPa. It is suitable for high-temperature gas transportation with medium flow and pressure requirements, and is not suitable for transporting the waste gas of large boilers to high-pressure tanks. Reciprocating compressors are suitable for occasions with high pressure requirements and relatively small flow rates. There is currently no situation on the market where centrifugal compressors are enlarged to increase the delivery flow rate. Since they need to move back and forth, the larger volume will lead to The centrifugal compressor causes large energy loss and high power consumption. It is suitable for large flow rates, but when the delivery pressure is high, the power consumption is relatively high. This is because the centrifugal compressor achieves gas pressurization and delivery by rotating the impeller at high speed to do work on the gas. Since it needs to provide sufficient kinetic energy to drive the gas flow and pressurization, the energy consumption is relatively high when operating at high power. Therefore, the delivery device 2 of the present invention can deliver gas under low power consumption, high delivery volume and high pressure. The two movable bodies 22 compress the gas in the annular shell 21 and deliver it to the gas storage tank 3 through unidirectional annular movement, which can increase the volume of the delivery device 2 and will not cause the problem of increased power consumption due to reciprocating movement. The increase in volume can reduce the moving speed of the movable body 22.

[0052] In an optional embodiment, the movable body 22 includes a connecting body 2202 and a piston head 2201 fixed at both ends of the connecting body 2202. The diameter of the connecting body 2202 is smaller than the diameter of the piston head 2201. The inner side of the connecting body 2202 is rotatably connected to a roller 2203 for driving the movable body 22 to move. The roller 2203 is rollingly connected to the inner wall surface of the annular shell 21. One end of the roller 2203 is coaxially fixedly connected to a sprocket 2204. The sprocket 2204 is connected to a driving device installed on the inner side of the connecting body 2202 through a chain 2205.

[0053] In this embodiment, the driving device can be a high temperature resistant electric motor, which drives the chain 2205 and thus drives the sprocket 2204 to rotate. The rotation of the sprocket 2204 can drive the roller 2203 to rotate. The rotation of the roller 2203 can drive the connecting body 2202 and then drive the piston head 2201 to move. The movement of the piston head 2201 can compress the gas.

[0054] In an optional embodiment, when the two movable bodies 22 are respectively located at the first stop position 23 and the second stop position 24 , the position where the two movable bodies 22 contact each other is located at the exhaust end of the annular housing 21 .

[0055] In this embodiment, Fig.10 As shown, the movable body 22 rotates counterclockwise, and when one of the movable bodies 22 stays at the first stop position 23, the other movable body 22 moves toward the second stop position 24 to compress the gas between the air inlet end and the second stop position 24 until the two movable bodies 22 contact each other, that is, the two movable bodies 22 are respectively located at the first stop position 23 and the second stop position 24. This process will discharge the compressed gas from the exhaust end of the annular shell 21 and squeeze it into the gas storage tank 3, and then the two movable bodies 22 rotate counterclockwise synchronously, and when the movable body 22 previously located at the second stop position 24 moves to the first stop position 23, it stops, and the movable body 22 previously located at the first stop position 23 continues to move counterclockwise until the movable body 22 moves to the second stop position 24.

[0056] In an optional embodiment, when the movable body 22 for moving and squeezing gas is in the stop position, an arc-shaped rack 26 movable relative to the annular housing 21 is provided between the two piston heads 2201 of the movable body 22, and the arc-shaped rack 26 is rotatably connected to the annular housing 21 through a connecting plate 27, and a receiving groove for receiving the arc-shaped rack 26 is provided on the inner side of one end of the annular housing 21, and a spring piece 28 is installed between the inner wall surface of the receiving groove and the inner arc surface of the arc-shaped rack 26, and a guide surface 29 is provided at one end of the arc-shaped rack 26, and a gear 2206 is coaxially fixedly connected to one end of the roller 2203, and the gear 2206 is used to mesh with the arc-shaped rack 26;

[0057] When the gear 2206 is meshed with the arc-shaped rack 26 , the arc-shaped rack 26 does not contact the piston head 2201 .

[0058] In this embodiment, when the movable body 22 moves normally, it is achieved by the rotation of the roller 2203. When the movable body 22 in the moving state compresses the gas, as the movable body 22 gets closer to the second stop position 24, the resistance to the movement of the movable body 22 becomes greater. At this time, the roller 2203 may slip. In order to cope with this situation, an arc-shaped rack 26 is provided. The arc-shaped rack 26 can be in contact with and meshed with the gear 2206 under the influence of elastic force. The rotation of the gear 2206 can drive the movable body 22 to continue moving when the roller 2203 slips until the movable body 22 completes the gas compression work. When the movable body 22 is in the stop position, the arc-shaped rack 26 is located between the two piston heads 2201 of the movable body 22. Therefore, the setting position of the arc-shaped rack 26 will not affect the movement of the movable body 22. When the arc-shaped rack 26 is extended by the elastic force of the spring piece 28, as shown in FIG. Figure 7 As shown, the bottom of the arc-shaped rack 26 abuts against the inner wall of the receiving groove, and the connecting plate 27 at this time points to the center of the annular shell 21, which means that when the gear 2206 is meshed with the arc-shaped rack 26, the gear 2206 will apply a downward force to the arc-shaped rack 26, but because the bottom of the arc-shaped rack 26 abuts against the inner wall of the receiving groove, the arc-shaped rack 26 can be stable and not move. At the same time, when the gear 2206 contacts the tooth surface of the arc-shaped rack 26, the interaction force between the tooth surfaces will give the arc-shaped rack 26 an extrusion force to move into the receiving groove, but the connecting plate 27 points to the center of the annular shell 21, that is, through the connecting plate 27. Provide sufficient support for the arc-shaped rack 26 to keep the position of the arc-shaped rack 26 stable. When the gear 2206 separates from the arc-shaped rack 26, the continued movement of the movable body 22 will cause the piston head 2201 to squeeze the arc-shaped rack 26. The guide surface 29 set on the arc-shaped rack 26 will first contact the piston head 2201. The piston head 2201 will push the arc-shaped rack 26 into the receiving groove due to the guide surface 29, so that the arc-shaped rack 26 is pressed into the receiving groove without hindering the movement of the piston head 2201. Of course, since the position of the arc-shaped rack 26 and its length are smaller than the connecting body 2202, the movable body 22 will not cause leakage of squeezed gas.

[0059] In an optional embodiment, a biaxial telescopic rod 2207 is fixedly connected to the inner side of the connecting body 2202, and the end of the movable axis of the biaxial telescopic rod 2207 is fixedly connected to a limiting block 2208. An inclined groove 25 is provided at the first stop position 23 of the annular shell 21. When the movable body 22 is located at the first stop position 23, the cooperation between the inclined groove 25 and the limiting block 2208 can limit the position of the movable body 22.

[0060] A proximity switch 2210 is fixedly connected to the inner side of the connecting body 2202, and a sensing body 2103 cooperating with the proximity switch 2210 is fixedly installed on the inclined surface of the inclined groove 25;

[0061] An annular conductive part 2101 is fixedly connected to the inner side of one end of the annular shell 21, and one end of the annular conductive part 2101 is electrically connected to an external power supply through a cable 2102. A conductive sheet 2209 for connecting electricity is fixedly installed at one end of the connecting body 2202, and the conductive sheet 2209 is slidably connected to the annular conductive part 2101.

[0062] In this embodiment: the movable body 22 can be stably stopped at the first stop position 23, which is achieved by the engagement of the limit block 2208 with the inclined groove 25. When the movable body 22 moves, when the proximity switch 2210 in the movable body 22 approaches the sensing body 2103, it means that the limit block 2208 has entered the inclined surface of the inclined groove 25. At this time, the limit block 2208 can be driven to move by the extension of the double-axis telescopic rod 2207, so that the limit block 2208 is engaged with the inclined groove 25 after movement. The electric power of the movable body 22 is conductively conducted through the sliding contact between the conductive sheet 2209 and the annular conductive member 2101. The annular conductive member 2101 and the annular shell 21 are insulated, and insulation isolation can be achieved by a mica board or insulating ceramics.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A boiler wide load denitration device, comprising a boiler exhaust pipe (1), wherein the output end of the boiler exhaust pipe (1) is connected to the denitration device, and is characterized in that: One end of the boiler exhaust pipe (1) is connected to the conveying device (2) and the gas storage tank (3) in sequence through the gas tank air inlet pipe (5). The low-temperature exhaust gas discharged from the boiler is stored in the gas storage tank (3). When the temperature of the exhaust gas discharged from the boiler meets the normal operation of the denitration device, the gas tank air inlet pipe (5) is closed, and the low-temperature exhaust gas stored in the gas storage tank (3) is returned to the boiler exhaust pipe (1) through the gas tank exhaust pipe (4).

2. The boiler wide load denitration device according to claim 1, characterized in that: The boiler exhaust pipe (1) is connected to the gas tank air inlet pipe (5), and a buffer shell (10) is connected to the gas tank air inlet pipe (5) between the boiler exhaust pipe (1) and the conveying device (2).

3. The boiler wide load denitration device according to claim 2, characterized in that: A one-way valve and / or a control valve is provided at the gas tank air inlet pipe (5) between the boiler exhaust pipe (1) and the buffer shell (10).

4. The boiler wide load denitration device according to claim 1, characterized in that: A second one-way valve (7) is provided at the gas tank air inlet pipe (5) between the conveying device (2) and the gas storage tank (3).

5. The boiler wide load denitration device according to claim 1, characterized in that: A gas tank exhaust pipe (4) is connected between the gas storage tank (3) and the boiler exhaust pipe (1), a first control valve (8) is installed at one end of the gas tank exhaust pipe (4), and a second control valve (9) is provided at the boiler exhaust pipe (1) between the gas tank exhaust pipe (4) and the gas tank air inlet pipe (5).

6. The boiler wide load denitration device according to any one of claims 1 to 5, characterized in that: The conveying device (2) comprises an annular shell (21) and two movable bodies (22) sliding inside the annular shell (21); the air inlet end and the air outlet end of the annular shell (21) are both connected to the air inlet pipe (5) of the gas tank; the two movable bodies (22) compress the gas in the annular shell (21) and convey it to the gas storage tank (3) by moving.

7. The boiler wide load denitration device according to claim 6, characterized in that: The movable body (22) comprises a connecting body (2202) and piston heads (2201) fixed at both ends of the connecting body (2202); the diameter of the connecting body (2202) is smaller than the diameter of the piston head (2201); a roller (2203) for driving the movable body (22) to move is rotatably connected to the inner side of the connecting body (2202); the roller (2203) is rollingly connected to the inner wall surface of the annular shell (21); one end of the roller (2203) is coaxially fixedly connected to a sprocket (2204); the sprocket (2204) is connected to a driving device installed on the inner side of the connecting body (2202) via a chain (2205).

8. The boiler wide load denitration device according to claim 6, characterized in that: When the two movable bodies (22) are respectively located at the first stop position (23) and the second stop position (24), the position where the two movable bodies (22) contact each other is located at the exhaust end of the annular housing (21).

9. The boiler wide load denitration device according to claim 7, characterized in that: When the movable body (22) for moving and squeezing gas is in the stop position, an arc-shaped rack (26) movable relative to the annular housing (21) is arranged between the two piston heads (2201) of the movable body (22), the arc-shaped rack (26) is rotatably connected to the annular housing (21) via a connecting plate (27), a receiving groove for receiving the arc-shaped rack (26) is arranged on the inner side of one end of the annular housing (21), a spring sheet (28) is installed between the inner wall surface of the receiving groove and the inner arc surface of the arc-shaped rack (26), a guide surface (29) is arranged at one end of the arc-shaped rack (26), and a gear (2206) is coaxially fixedly connected to one end of the roller (2203), and the gear (2206) is used for meshing connection with the arc-shaped rack (26); When the gear (2206) is meshed with the arc-shaped rack (26), the arc-shaped rack (26) does not contact the piston head (2201).

10. The boiler wide load denitration device according to claim 8, characterized in that: A double-axis telescopic rod (2207) is fixedly connected to the inner side of the connecting body (2202); the end of the movable axis of the double-axis telescopic rod (2207) is fixedly connected to a limit block (2208); an inclined groove (25) is provided at the first stop position (23) of the annular shell (21); when the movable body (22) is located at the first stop position (23), the cooperation between the inclined groove (25) and the limit block (2208) can limit the position of the movable body (22); A proximity switch (2210) is fixedly connected to the inner side of the connecting body (2202), and a sensing body (2103) matching the proximity switch (2210) is fixedly installed on the inclined surface of the inclined groove (25); An annular conductive member (2101) is fixedly connected to the inner side of one end of the annular shell (21), one end of the annular conductive member (2101) is electrically connected to an external power source via a cable (2102), and a conductive sheet (2209) for connecting electricity is fixedly installed on one end of the connecting body (2202), and the conductive sheet (2209) and the annular conductive member (2101) are slidably connected to electricity.

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