Boiler hot water recycling denitration device

Abstract

The utility model relates to the technical field of boiler circulating denitration, in particular to a boiler hot water recycling denitration device which comprises a boiler, a denitration chamber and a circulating pump, a smoke communicating pipe is detachably installed at the top end of the boiler, the other end of the smoke communicating pipe is connected with the center of the bottom end of the denitration chamber, and a heating chamber is installed at the bottom end of the denitration chamber. A U-shaped transverse pipe is installed on the peripheral side wall of the circulating pump, side heating assemblies are installed at the two ends of the U-shaped transverse pipe, a U-shaped recycling pipe is detachably installed between the other ends of the side heating assemblies, a flow dividing pipe is installed at the bottom end of the middle of the U-shaped transverse pipe, the other end of the flow dividing pipe is connected with the top end of one side of the heating chamber, and a backflow branch pipe is installed at the bottom end of the other side of the heating chamber. According to the utility model, hot water is recycled through the boiler and the circulating pump, the temperature of the two side walls of the denitration chamber in the denitration process is regulated and controlled, and the temperature of the smoke inlet end of the denitration chamber is regulated and controlled through the heating chamber, so that the catalytic reduction temperature required by denitration is regulated and controlled through the heat of the hot water on the premise of improving the circulating efficiency of the hot water.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler circulation denitration, in particular to a boiler hot water recirculation denitration device. Background Art

[0002] The fuel combustion process is a major source of atmospheric pollutants, significantly impacting human health, air quality, and climate change. Nitrogen oxides (NOx) are one of the primary pollutants emitted when boiler fuel is burned in boilers. Typical non-catalytic denitrification schemes reduce NOx emissions by adding denitrifiers such as liquid ammonia, ammonia gas, or urea solution to the flue gas treatment process at 800-1100°C. This method can reduce NOx to N2 to a certain extent, but its denitrification efficiency rarely exceeds 50%. Especially for large boilers, the majority of improved boiler denitrification devices utilize selective catalytic reduction technology, and the catalysts typically require an operating temperature range of 300-400°C.

[0003] The catalytic reduction efficiency of the catalyst in the denitrification device is often related to the temperature of the flue gas itself and the operating temperature of the denitrification chamber. However, in existing denitrification devices, there is often a lack of recycling of boiler hot water, which causes the heat of the boiler hot water to be directly wasted and cannot be used to control the temperature of the denitrification chamber; and in the process of flue gas being transferred from the boiler to the denitrification chamber, the temperature of the flue gas continues to drop in the pipeline, resulting in a low flue gas temperature at the smoke inlet end of the denitrification device, which is not conducive to subsequent catalytic reduction. Therefore, it is necessary to design an additional smoke inlet heating device, which not only makes the entire device complicated, but also lacks the recycling of the filtered hot water temperature to this location.

[0004] Therefore, it is necessary to invent a boiler hot water recirculation denitrification device to solve the above problems. Utility Model Content

[0005] In order to address the deficiencies of the prior art, the purpose of the present invention is to provide a boiler hot water recycling denitrification device, which solves the problem that the prior art often lacks the recycling of boiler hot water, thereby causing the heat of the boiler hot water to be directly wasted and unable to be used for temperature control of the denitrification chamber; and in the process of flue gas being transferred from the boiler to the denitrification chamber, the temperature of the flue gas continues to drop in the pipeline, resulting in a low flue gas temperature at the smoke inlet end of the denitrification device, which is not conducive to subsequent catalytic reduction. Therefore, it is necessary to design an additional smoke inlet end heating device, which not only makes the entire device complicated, but also lacks the problem of applying the filtered hot water temperature to the recycling use there.

[0006] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0007] The evaporation pipe is connected to the heat exchanger via a channel that is provided with a channel for circulating heat from the heat exchanger to the outlet port, and the channel is connected to the heat exchanger via a channel for circulating heat from the heat exchanger to the outlet port.

[0008] As a preferred solution of the present invention, the side heating assembly includes a first vertical tube that is detachably mounted on the end of the U-shaped horizontal tube, a plurality of heating horizontal tubes arranged on the side walls of the first vertical tube and parallel to the side walls of the denitrification chamber, and a second vertical tube installed between the other ends of the plurality of heating horizontal tubes, and the first vertical tube and the second vertical tube are respectively located at the edges on both sides of the denitrification chamber.

[0009] As a preferred solution of the present invention, both ends of the U-shaped recovery pipe are detachably connected to the bottom ends of the two second vertical pipes.

[0010] As a preferred solution of the present invention, support frames are provided at symmetrical positions on one side wall of the denitrification chamber, the U-shaped horizontal pipe is detachably installed between multiple support frames, and a hot water circulation pipe is installed at the top middle part of the U-shaped horizontal pipe, and the other end of the hot water circulation pipe is detachably connected to the circulation pump.

[0011] As a preferred solution of the present invention, the bottom end of the boiler and the top end of the circulating pump are detachably connected via a water outlet pipe, an air outlet pipe is installed at the top end of the boiler, and one end of the flue gas connecting pipe is detachably connected to the air outlet pipe.

[0012] As a preferred solution of the present invention, a discharge pipe is installed in the middle of the top of the denitrification chamber.

[0013] As a preferred solution of the present invention, the smoke connecting pipe, the U-shaped horizontal pipe, the diversion pipe and the return main pipe can all control the flow automatically.

[0014] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0015] In the present invention, the boiler hot water is transferred to the periphery of the denitrification chamber through a circulation pump and a U-shaped cross pipe, and part of the boiler hot water is transferred to the two side walls of the denitrification chamber through a side heating assembly, so that the hot water in the side heating assembly is used to heat the temperature of the two side walls of the denitrification chamber, thereby adaptively regulating the temperature of the denitrification chamber to the optimal catalytic reduction temperature; at the same time, part of the hot water in the U-shaped cross pipe can be transferred to the heating chamber through a diversion pipe, so that the temperature is heated and regulated at the connection end of the flue gas connecting pipe and the denitrification chamber to avoid the low temperature at the smoke inlet end of the denitrification chamber, and the boiler hot water in the side heating assembly and in the heating chamber is returned through the U-shaped recovery pipe, and finally transferred to the boiler again through the reflux main pipe and subsequently recycled by the circulation pump. Finally, the hot water is circulated by the boiler and the circulation pump, and the temperature of the two side walls of the denitrification chamber during the denitrification process is regulated, and the temperature of the smoke inlet end of the denitrification chamber is regulated through the heating chamber. Under the premise of improving the hot water circulation efficiency, the catalytic reduction temperature required for denitrification is regulated by the heat of hot water. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the front plan view structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the planar top view structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the utility model when viewed from below.

[0020] Description of reference numerals:

[0021] 1. Boiler; 2. Water outlet pipe; 3. Circulation pump; 4. Air outlet pipe; 5. Flue gas connecting pipe; 6. Denitrification chamber; 7. Heating chamber; 8. Hot water circulation pipe; 9. U-shaped horizontal pipe; 10. Support frame; 11. First vertical pipe; 12. Heating horizontal pipe; 13. Second vertical pipe; 14. Diversion pipe; 15. U-shaped recovery pipe; 16. Reflux branch pipe; 17. Reflux main pipe; 18. Discharge pipe. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] The utility model provides Figure 1-4The boiler hot water recirculation denitrification device shown in the figure comprises a boiler 1, a denitrification chamber 6 located on the right side of the boiler, and a circulating pump 3 detachably mounted on the bottom end of the boiler 1. A flue gas connecting pipe 5 is detachably mounted on the top of the boiler 1. The other end of the flue gas connecting pipe 5 is detachably connected to the center of the bottom end of the denitrification chamber 6. A hollow heating chamber 7 is mounted around the flue gas connecting pipe 5 at the bottom end of the denitrification chamber 6. A U-shaped transverse pipe 9 is detachably mounted on the side wall of the circulating pump 3. Both ends of the U-shaped transverse pipe 9 are mounted with side heating components that are parallel to the side walls of the denitrification chamber 6. The side heating components are also mounted on the bottom end of the denitrification chamber 6. A U-shaped recovery pipe 15 is detachably installed between one end and the other end, a diversion pipe 14 is installed at the bottom middle end of the U-shaped horizontal pipe 9, the other end of the diversion pipe 14 is connected to the top of one side of the heating chamber 7, a reflux branch pipe 16 is installed at the bottom end of the other side of the heating chamber 7, the other end of the reflux branch pipe 16 is detachably connected to the middle of the U-shaped recovery pipe 15, a reflux main pipe 17 is installed in the middle of the U-shaped recovery pipe 15, the other end of the reflux main pipe 17 is detachably connected to the bottom side of the side wall of the boiler 1, and the heating chamber 7 is arranged in the middle of the bottom end of the denitrification chamber 6, which is convenient for the flue gas to enter the denitrification chamber for denitrification from bottom to top.

[0024] The side heating assembly includes a first vertical pipe 11 that can be detachably mounted on the end of the U-shaped horizontal pipe 9, a plurality of heating horizontal pipes 12 arranged on the side walls of the first vertical pipe 11 and parallel to the side walls of the denitrification chamber 6, and a second vertical pipe 13 installed between the other ends of the plurality of heating horizontal pipes 12. The first vertical pipe 11 and the second vertical pipe 13 are respectively located at the edges on both sides of the denitrification chamber 6. A plurality of heating horizontal pipes 12 can be arranged horizontally, and then at different longitudinal heights of the denitrification chamber 6, the catalytic reduction temperature of the denitrification chamber 6 is regulated by the heat of the hot water from the boiler 1 in the heating horizontal pipe 12.

[0025] The two ends of the U-shaped recovery pipe 15 are detachably connected to the bottom ends of the two second vertical pipes 13 respectively. Support frames 10 are provided at symmetrical positions on one side wall of the denitrification chamber 6. The U-shaped horizontal pipe 9 is detachably installed between multiple support frames 10, and a hot water circulation pipe 8 is installed at the top middle part of the U-shaped horizontal pipe 9. The other end of the hot water circulation pipe 8 is detachably connected to the circulation pump 3. The support frame 10 can improve the installation strength of the U-shaped horizontal pipe 9 on the side wall around the denitrification chamber 6.

[0026] The bottom end of the boiler 1 and the top end of the circulating pump 3 are detachably connected via the water outlet pipe 2. An air outlet pipe 4 is installed at the top end of the boiler 1. One end of the flue gas connecting pipe 5 is detachably connected to the air outlet pipe 4. A discharge pipe 18 is installed in the middle of the top end of the denitrification chamber 6. The hot water from the boiler 1 enters the circulating pump 3 from the water outlet pipe 2, and the flue gas is transferred from the air outlet pipe 4 above to the flue gas connecting pipe 5.

[0027] The flue gas connecting pipe 5, U-shaped horizontal pipe 9, diversion pipe 14 and return main pipe 17 can all control the flow by themselves. The pipes can regulate the flow through their own control valves, thereby facilitating the circulation and retention of hot water from the boiler 1.

[0028] In the present invention, the hot water from the boiler 1 is transferred to the periphery of the denitrification chamber 6 through the circulation pump 3 and the U-shaped transverse pipe 9, and part of the hot water from the boiler 1 is transferred to the two side walls of the denitrification chamber 6 through the side heating assembly, so that the hot water in the side heating assembly is used to heat the two side walls of the denitrification chamber 6, thereby adaptively regulating the temperature of the denitrification chamber 6 to the optimal catalytic reduction temperature; at the same time, part of the hot water from the U-shaped transverse pipe 9 can be transferred to the heating chamber 7 through the diversion pipe 14, so that the temperature is heated and regulated at the connection end of the flue gas connecting pipe 5 and the denitrification chamber 6, thereby avoiding the denitrification chamber from being heated. 6 has a low temperature at the smoke inlet end, while the hot water from the boiler 1 in the side heating assembly and the heating chamber 7 is refluxed through the U-shaped recovery pipe 15, and finally transferred to the boiler 1 again through the reflux main pipe 17 and subsequently recycled through the circulation pump 3. Finally, the hot water is circulated by the boiler 1 and the circulation pump 3, and the temperature of the two side walls of the denitrification chamber 6 during the denitrification process is regulated, and the temperature of the smoke inlet end of the denitrification chamber 6 is regulated through the heating chamber 7. Under the premise of improving the hot water circulation efficiency, the catalytic reduction temperature required for denitrification is regulated by the heat of the hot water.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A boiler hot water recirculation denitrification device, characterized by: The invention comprises a boiler (1), a denitrification chamber (6) located on the right side of the boiler, and a circulating pump (3) detachably mounted on the bottom end of the boiler (1); a flue gas connecting pipe (5) is detachably mounted on the top end of the boiler (1); the other end of the flue gas connecting pipe (5) is detachably connected to the center of the bottom end of the denitrification chamber (6); and a hollow heating chamber (7) is mounted around the flue gas connecting pipe (5) at the bottom end of the denitrification chamber (6); a U-shaped transverse pipe (9) is detachably mounted on the side wall of the circulating pump (3); and side heating elements parallel to the side wall of the denitrification chamber (6) are mounted on both ends of the U-shaped transverse pipe (9). The side heating assembly comprises a U-shaped recovery pipe (15) detachably mounted between the other ends of the side heating assembly, a diversion pipe (14) is mounted at the middle bottom end of the U-shaped horizontal pipe (9), the other end of the diversion pipe (14) is connected to the top end of one side of the heating chamber (7), a reflux branch pipe (16) is mounted at the bottom end of the other side of the heating chamber (7), the other end of the reflux branch pipe (16) is detachably connected to the middle of the U-shaped recovery pipe (15), a reflux main pipe (17) is mounted at the middle of the U-shaped recovery pipe (15), and the other end of the reflux main pipe (17) is detachably connected to the bottom side of the peripheral wall of the boiler (1).

2. A boiler hot water recirculation denitrification device according to claim 1, characterized in that: The side heating assembly comprises a first vertical tube (11) detachably mounted on the end of the U-shaped horizontal tube (9), a plurality of heating horizontal tubes (12) arranged on the peripheral side wall of the first vertical tube (11) and parallel to the side wall of the denitrification chamber (6), and a second vertical tube (13) mounted between the other ends of the plurality of heating horizontal tubes (12), wherein the first vertical tube (11) and the second vertical tube (13) are respectively located at the edges on both sides of the denitrification chamber (6).

3. The boiler hot water recirculation denitrification device according to claim 2, characterized in that: Both ends of the U-shaped recovery pipe (15) are detachably connected to the bottom ends of the two second vertical pipes (13).

4. The boiler hot water recirculation denitrification device according to claim 1, characterized in that: Support frames (10) are provided at symmetrical positions on one side wall of the denitrification chamber (6), the U-shaped transverse pipe (9) is detachably installed between the plurality of support frames (10), and a hot water circulation pipe (8) is installed at the top end of the middle portion of the U-shaped transverse pipe (9), and the other end of the hot water circulation pipe (8) is detachably connected to the circulation pump (3).

5. The boiler hot water recirculation denitrification device according to claim 1, characterized in that: The bottom end of the boiler (1) and the top end of the circulating pump (3) are detachably connected via a water outlet pipe (2). An air outlet pipe (4) is installed at the top end of the boiler (1), and one end of the flue gas connecting pipe (5) is detachably connected to the air outlet pipe (4).

6. The boiler hot water recirculation denitrification device according to claim 1, characterized in that: A discharge pipe (18) is installed in the middle of the top of the denitrification chamber (6).

7. The boiler hot water recirculation denitrification device according to claim 1, characterized in that: The flue gas connecting pipe (5), the U-shaped transverse pipe (9), the diversion pipe (14) and the return flow main pipe (17) can all control the flow automatically.

Images