Low-nitrogen condensation hot water boiler

Abstract

The utility model relates to the technical field of hot water boilers, in particular to a low-nitrogen condensation hot water boiler which not only can treat nitric oxide in flue gas for multiple times and improve the absorption effect on the nitric oxide, but also can improve the heat utilization rate and utilize heat in the flue gas and heat generated by reaction. Comprising a hot-water boiler; the device further comprises a preheating mechanism, a stirring mechanism, an inflation mechanism and a treatment mechanism, the preheating mechanism is installed on the hot water boiler and preheats water, the stirring mechanism is installed on the preheating mechanism and conducts primary treatment on smoke, and the inflation mechanism is installed on the stirring mechanism and conveys the smoke into the treatment mechanism from the stirring mechanism. And the treatment mechanism is mounted on the gas filling mechanism and is used for carrying out secondary treatment on the flue gas.

Description

Technical Field

[0001] The utility model relates to the technical field of hot water boilers, in particular to a low-nitrogen condensing hot water boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes the chemical energy in fuel and electric energy. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of heat energy.

[0003] For existing low-nitrogen condensing hot water boilers, such as a low-nitrogen condensing hot water boiler disclosed in the utility model patent with the application number 202021780824.2, its main structure includes a boiler body equipped with a low-nitrogen combustion box, a low-nitrogen burner and heat exchange water pipes. The low-nitrogen burner is provided with a gas installation interface. The low-nitrogen burner passes through the low-nitrogen combustion box and extends into the interior of the low-nitrogen combustion box. The bottom end of the low-nitrogen combustion box is provided with a flue gas circulation box. The heat exchange water pipes include a preheating section located in the flue gas circulation box and a constant temperature section located in the low-nitrogen combustion box. When in use, cold water enters from the inlet of the heat exchange water pipes, flows through the preheating section and the constant temperature section in sequence, and triggers the low-nitrogen burner. Gas enters the low-nitrogen combustion box from the gas installation interface and heats the constant temperature section, so that the hot water discharged from the constant temperature section is maintained at 80°C. The flue gas generated by the low-nitrogen combustion box enters the flue gas circulation box from the recovery pipe, and the exhaust fan promotes the flue gas in the low-nitrogen combustion box to enter the flue gas circulation box for heat exchange with the preheating section. Finally, the flue gas is discharged from the bent pipe and the outer discharge straight pipe in sequence.

[0004] However, most of the existing low-nitrogen condensing hot water boilers only treat the flue gas once, which easily makes the discharged flue gas still contain nitrogen oxides, and the heat utilization rate of the flue gas in most low-nitrogen condensing hot water boilers is relatively low. Summary of the Utility Model

[0005] To solve the above technical problems, the utility model provides a low-nitrogen condensing hot water boiler that can not only treat nitrogen oxides in the flue gas multiple times to improve the absorption effect of nitrogen oxides, but also improve the heat utilization rate and utilize the heat in the flue gas and the heat generated by the reaction.

[0006] A low-nitrogen condensing hot water boiler of the utility model comprises a hot water boiler; it further comprises a preheating mechanism, a stirring mechanism, an air-filling mechanism and a treatment mechanism. The preheating mechanism is installed on the hot water boiler and preheats water. The stirring mechanism is installed on the preheating mechanism and conducts the first treatment on the flue gas. The air-filling mechanism is installed on the stirring mechanism and conveys the flue gas from the stirring mechanism into the treatment mechanism. The treatment mechanism is installed on the air-filling mechanism and conducts the second treatment on the flue gas. After the preheating mechanism preheats the water, it conveys the water into the hot water boiler. The hot water boiler heats the water. The flue gas generated by heating enters into the stirring mechanism. The flue gas is mixed with oxygen to convert nitric oxide into nitrogen dioxide. At the same time, the heat in the flue gas is used to preheat the water in the preheating mechanism. The air-filling mechanism extracts the nitrogen dioxide in the stirring mechanism and then conveys it into the treatment mechanism. The treatment mechanism converts the nitrogen dioxide into sodium nitrate by using sodium hydroxide solution, and filters the flue gas again by using activated carbon and then discharges the flue gas.

[0007] Preferably, the hot water boiler comprises a furnace body, a controller, an igniter, a heating pipe and a drain pipe. The bottom end of the furnace body is connected to the ground. A furnace cavity is arranged inside the furnace body. The controller is installed on the furnace body. The igniter is installed in the furnace cavity of the furnace body. The heating pipe is installed in the cavity of the furnace body. The drain pipe is installed on the furnace body and is internally communicated with the heating pipe. Start the controller. The controller mixes gas and air and then conveys them into the igniter. The igniter ignites to heat the heating pipe and the water. The heated water is discharged through the drain pipe.

[0008] Preferably, the preheating mechanism comprises a heat exchange box, a water inlet pipe, a first valve and a water delivery pipe. The heat exchange box is installed on the furnace body. A cavity is arranged inside the heat exchange box. The water inlet pipe is installed on the heat exchange box and is internally communicated with the cavity of the heat exchange box. The first valve is installed on the water inlet pipe. The top end of the water delivery pipe is internally communicated with the bottom end of the heat exchange box. At the same time, the water delivery pipe is internally communicated with the heating pipe. Connect the water inlet pipe to a water source, open the first valve, convey water through the water inlet pipe into the cavity of the heat exchange box. The water in the stirring mechanism exchanges heat with the water in the cavity of the heat exchange box to preheat the water. The preheated water enters into the heating pipe through the water delivery pipe, improving the utilization rate of heat.

[0009] Preferably, the stirring mechanism includes a heat exchange cylinder, a gas transmission pipe, an oxygen addition pipe, a second valve, a motor, a speed reducer, a transmission shaft, and three groups of fan blades. The heat exchange cylinder is installed in the cavity of the heat exchange box. An inner cavity is provided inside the heat exchange cylinder. The gas transmission pipe is installed on the furnace body and is in communication with both the furnace cavity of the furnace body and the inner cavity of the heat exchange cylinder. The oxygen addition pipe is installed on the heat exchange box and is in communication with the inner cavity of the heat exchange cylinder. The second valve is installed on the oxygen addition pipe. The bottom end of the motor is connected to the top end of the furnace body. The bottom end of the speed reducer is connected to the top end of the heat exchange box. The transmission shaft is rotatably installed in the inner cavity of the heat exchange cylinder and is longitudinally connected to the speed reducer. The three groups of fan blades are all installed on the transmission shaft. The flue gas generated by combustion in the furnace cavity of the furnace body is transported to the inner cavity of the heat exchange cylinder through the gas transmission pipe. Connect the oxygen addition pipe to an oxygen cylinder, open the second valve, and transport oxygen to the inner cavity of the heat exchange cylinder. Start the motor. The motor drives the transmission shaft and the three groups of fan blades to rotate through the speed reducer. The three groups of fan blades stir the flue gas and oxygen, accelerating the reaction between oxygen and nitric oxide in the flue gas to generate nitrogen dioxide.

[0010] Preferably, the air inflation mechanism includes an air pump, an air extraction pipe, an air supply pipe, and a check valve. The bottom end of the air pump is connected to the top end of the furnace body. The air extraction pipe is installed on the air pump and is in communication with the inner cavity of the heat exchange cylinder. The air supply pipe is installed on the air pump. The check valve is installed on the air supply pipe. Start the air pump. The air pump extracts the flue gas in the inner cavity of the heat exchange cylinder through the air extraction pipe, and then transports it to the treatment mechanism through the air supply pipe. The check valve is provided to prevent the reverse flow of flue gas. The air pump is provided to improve the treatment speed of the flue gas.

[0011] Preferably, the treatment mechanism includes a treatment box, a partition board, and a smoke exhaust pipe. The bottom end of the treatment box is connected to the top end of the furnace body. A treatment cavity is provided inside the treatment box. The partition board is installed in the treatment cavity of the treatment box and divides the treatment cavity into left and right parts. Sodium hydroxide solution is stored in the right treatment cavity. The air supply pipe extends below the liquid level of the sodium hydroxide solution in the right treatment cavity of the treatment box. Activated carbon is stored in the left treatment cavity of the treatment box. The smoke exhaust pipe is installed on the treatment box and is in communication with the inner part of the left treatment cavity of the treatment box. The air supply pipe transports the flue gas into the sodium hydroxide solution in the treatment box. The sodium hydroxide solution reacts with nitrogen dioxide to remove nitrogen dioxide in the flue gas. Other gases in the flue gas pass through the partition board and enter the activated carbon. The activated carbon filters other impurities in the flue gas. The filtered flue gas is discharged through the smoke exhaust pipe.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: The preheating mechanism preheats water and then transports the water to the hot water boiler. The hot water boiler heats the water. The flue gas generated by heating enters the stirring mechanism. The flue gas and oxygen are mixed to convert nitric oxide into nitrogen dioxide. At the same time, the heat in the flue gas is used to preheat the water in the preheating mechanism. The air inflation mechanism extracts nitrogen dioxide in the stirring mechanism and then transports it to the treatment mechanism. The treatment mechanism uses sodium hydroxide solution to convert nitrogen dioxide into sodium nitrate and uses activated carbon to filter the flue gas again and then discharges the flue gas. Brief Description of the Drawings

[0013] Figure 1 is an isometric structural view of the present utility model;

[0014] Figure 2 is a sectional isometric structural view of the hot water boiler and the treatment mechanism of the present utility model;

[0015] Figure 3 is a sectional isometric structural view of the preheating mechanism and the stirring mechanism of the present utility model;

[0016] Figure 4 is a partially enlarged isometric structural view of the stirring mechanism and the air inflation mechanism of the present utility model;

[0017] Figure 5 is an isometric structural view of the hot water boiler and the treatment mechanism of the present utility model.

[0018] Reference numerals in the drawings: 01, hot water boiler; 11, furnace body; 12, controller; 13, igniter; 14, heating pipeline; 15, drain pipe; 02, preheating mechanism; 21, heat exchange box; 22, water inlet pipe; 23, first valve; 24, water delivery pipe; 03, stirring mechanism; 31, heat exchange cylinder; 32, gas delivery pipe; 33, oxygen addition pipe; 34, second valve; 35, motor; 36, speed reducer; 37, transmission shaft; 38, fan blade; 04, air inflation mechanism; 41, air pump; 42, air extraction pipe; 43, air supply pipe; 44, check valve; 05, treatment mechanism; 51, treatment box; 52, partition board; 53, smoke exhaust pipe. Detailed Embodiment

[0019] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0020] Embodiment 1

[0021] A low-nitrogen condensing hot water boiler of the present utility model includes a hot water boiler 01; it further includes a preheating mechanism 02, a stirring mechanism 03, an air-filling mechanism 04, and a treatment mechanism 05. The preheating mechanism 02 is installed on the hot water boiler 01 and preheats water. The stirring mechanism 03 is installed on the preheating mechanism 02 and performs a first treatment on the flue gas. The air-filling mechanism 04 is installed on the stirring mechanism 03 and conveys the flue gas from the stirring mechanism 03 into the treatment mechanism 05. The treatment mechanism 05 is installed on the air-filling mechanism 04 and performs a second treatment on the flue gas; the hot water boiler 01 includes a furnace body 11, a controller 12, an igniter 13, a heating pipe 14, and a drain pipe 15. The bottom end of the furnace body 11 is connected to the ground. There is a furnace cavity inside the furnace body 11. The controller 12 is installed on the furnace body 11. The igniter 13 is installed in the furnace cavity of the furnace body 11. The heating pipe 14 is installed in the cavity of the furnace body 11. The drain pipe 15 is installed on the furnace body 11 and is internally communicated with the heating pipe 14; the preheating mechanism 02 includes a heat exchange box 21, a water inlet pipe 22, a first valve 23, and a water delivery pipe 24. The heat exchange box 21 is installed on the furnace body 11. There is a cavity inside the heat exchange box 21. The water inlet pipe 22 is installed on the heat exchange box 21 and is internally communicated with the cavity of the heat exchange box 21. The first valve 23 is installed on the water inlet pipe 22. The top end of the water delivery pipe 24 is internally communicated with the bottom end of the heat exchange box 21, and at the same time, the water delivery pipe 24 is internally communicated with the heating pipe 14; the stirring mechanism 03 includes a heat exchange cylinder 31, an air delivery pipe 32, an oxygen addition pipe 33, a second valve 34, a motor 35, a speed reducer 36, a transmission shaft 37, and three groups of fan blades 38. The heat exchange cylinder 31 is installed in the cavity of the heat exchange box 21. There is an inner cavity inside the heat exchange cylinder 31. The air delivery pipe 32 is installed on the furnace body 11 and is internally communicated with both the furnace cavity of the furnace body 11 and the inner cavity of the heat exchange cylinder 31. The oxygen addition pipe 33 is installed on the heat exchange box 21 and is internally communicated with the inner cavity of the heat exchange cylinder 31. The second valve 34 is installed on the oxygen addition pipe 33. The bottom end of the motor 35 is connected to the top end of the furnace body 11. The bottom end of the speed reducer 36 is connected to the top end of the heat exchange box 21. The transmission shaft 37 is rotatably installed in the inner cavity of the heat exchange cylinder 31 and is longitudinally connected to the speed reducer 36. The three groups of fan blades 38 are all installed on the transmission shaft 37; the air-filling mechanism 04 includes an air pump 41, an air extraction pipe 42, an air delivery pipe 43, and a check valve 44. The bottom end of the air pump 41 is connected to the top end of the furnace body 11. The air extraction pipe 42 is installed on the air pump 41 and is internally communicated with the inner cavity of the heat exchange cylinder 31. The air delivery pipe 43 is installed on the air pump 41. The check valve 44 is installed on the air delivery pipe 43;When it is working, first, start the controller 12. The controller 12 mixes gas and air and then transports them into the igniter 13. The igniter 13 ignites to heat the heating pipe 14 and water. The flue gas generated by combustion in the furnace cavity of the furnace body 11 is transported into the inner cavity of the heat exchange cylinder 31 through the gas transmission pipe 32. Connect the oxygen adding pipe 33 with the oxygen cylinder, open the second valve 34, and transport oxygen into the inner cavity of the heat exchange cylinder 31. Start the motor 35. The motor 35 drives the transmission shaft 37 and three groups of fan blades 38 to rotate through the speed reducer 36. The three groups of fan blades 38 stir the flue gas and oxygen, accelerating the reaction of oxygen and nitric oxide in the flue gas to generate nitrogen dioxide. Connect the water inlet pipe 22 with the water source, open the first valve 23, and transport water into the cavity of the heat exchange box 21 through the water inlet pipe 22. The stirring mechanism 03 exchanges heat with the water in the cavity of the heat exchange box 21 to preheat the water. The preheated water enters the heating pipe 14 through the water transmission pipe 24, improving the utilization rate of heat. The heated water is discharged through the drain pipe 15. Start the air pump 41. The air pump 41 extracts the flue gas in the inner cavity of the heat exchange cylinder 31 through the air extraction pipe 42 and then transports it into the treatment mechanism 05 through the air supply pipe 43. The check valve 44 is provided to prevent the backflow of flue gas, and the air pump 41 is provided to improve the treatment speed of the flue gas.;

[0022] Embodiment 2

[0023] Such as Figures 1 to 5As shown in the figure, a low-nitrogen condensing hot water boiler of the present utility model is based on Embodiment 1; the treatment mechanism 05 includes a treatment box 51, a partition plate 52 and a smoke exhaust pipe 53. The bottom end of the treatment box 51 is connected to the top end of the furnace body 11. A treatment cavity is provided inside the treatment box 51. The partition plate 52 is installed in the treatment cavity of the treatment box 51 and divides the treatment cavity into left and right parts. Sodium hydroxide solution is stored in the right treatment cavity. The air supply pipe 43 extends below the liquid level of the solution in the right treatment cavity of the treatment box 51. Activated carbon is stored in the left treatment cavity of the treatment box 51. The smoke exhaust pipe 53 is installed on the treatment box 51 and is internally communicated with the left treatment cavity of the treatment box 51; when it works, first, start the controller 12. The controller 12 mixes gas and air and then transports them into the igniter 13. The igniter 13 ignites to heat the heating pipe 14 and water. The flue gas generated by combustion in the furnace cavity of the furnace body 11 is transported into the inner cavity of the heat exchange cylinder 31 through the gas transmission pipe 32. Connect the oxygen supply pipe 33 to the oxygen cylinder, open the second valve 34, and transport oxygen into the inner cavity of the heat exchange cylinder 31. Start the motor 35. The motor 35 drives the transmission shaft 37 and three groups of fan blades 38 to rotate through the speed reducer 36. The three groups of fan blades 38 stir the flue gas and oxygen to accelerate the reaction of nitric oxide in the oxygen and flue gas to generate nitrogen dioxide. Connect the water inlet pipe 22 to the water source, open the first valve 23, and transport water into the cavity of the heat exchange box 21 through the water inlet pipe 22. The stirring mechanism 03 exchanges heat with the water in the cavity of the heat exchange box 21 to preheat the water. The preheated water enters the heating pipe 14 through the water transmission pipe 24 to improve the utilization rate of heat. The heated water is discharged through the drain pipe 15. Start the air pump 41. The air pump 41 extracts the flue gas in the inner cavity of the heat exchange cylinder 31 through the air extraction pipe 42, and then transports it into the treatment mechanism 05 through the air supply pipe 43. The check valve 44 is provided to prevent the flue gas from flowing back. The air pump 41 is provided to improve the treatment speed of the flue gas. The air supply pipe 43 transports the flue gas into the sodium hydroxide solution in the treatment box 51. The sodium hydroxide solution reacts with nitrogen dioxide to remove nitrogen dioxide in the flue gas. Other gases in the flue gas pass through the partition plate 52 and enter the activated carbon. The activated carbon filters other impurities in the flue gas. The filtered flue gas is discharged through the smoke exhaust pipe 53.

[0024] The motor 35, speed reducer 36 and air pump 41 of the present utility model are purchased on the market. Those skilled in the art only need to install and operate according to the attached operation manuals, without the need for creative labor from those skilled in the art.

[0025] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A low-nitrogen condensing hot water boiler, comprising a hot water boiler (01); characterized in that: The invention also comprises a preheating mechanism (02), a stirring mechanism (03), an aeration mechanism (04) and a treatment mechanism (05), wherein the preheating mechanism (02) is installed on the hot water boiler (01) and preheats water, the stirring mechanism (03) is installed on the preheating mechanism (02) and performs a first treatment on the flue gas, the aeration mechanism (04) is installed on the stirring mechanism (03) and transports the flue gas from the stirring mechanism (03) to the treatment mechanism (05), and the treatment mechanism (05) is installed on the aeration mechanism (04) and performs a second treatment on the flue gas.

2. A low-nitrogen condensing hot water boiler as claimed in claim 1, characterized in that: The hot water boiler (01) comprises a furnace body (11), a controller (12), an igniter (13), a heating pipe (14) and a drain pipe (15); the bottom end of the furnace body (11) is connected to the ground; a furnace cavity is arranged inside the furnace body (11); the controller (12) is mounted on the furnace body (11); the igniter (13) is mounted in the furnace cavity of the furnace body (11); the heating pipe (14) is mounted in the cavity of the furnace body (11); and the drain pipe (15) is mounted on the furnace body (11) and is connected to the inside of the heating pipe (14).

3. A low nitrogen condensing hot water boiler as claimed in claim 2, characterized in that: The preheating mechanism (02) comprises a heat exchange box (21), a water inlet pipe (22), a first valve (23) and a water delivery pipe (24); the heat exchange box (21) is mounted on the furnace body (11); a cavity is provided inside the heat exchange box (21); the water inlet pipe (22) is mounted on the heat exchange box (21) and communicates with the interior of the cavity of the heat exchange box (21); the first valve (23) is mounted on the water inlet pipe (22); the top end of the water delivery pipe (24) is communicated with the interior of the bottom end of the heat exchange box (21); and the water delivery pipe (24) is communicated with the interior of the heating pipe (14).

4. A low nitrogen condensing hot water boiler as claimed in claim 3, characterized in that: The stirring mechanism (03) comprises a heat exchange tube (31), an air delivery pipe (32), an oxygenation pipe (33), a second valve (34), an electric motor (35), a reducer (36), a transmission shaft (37) and three sets of fan blades (38). The heat exchange tube (31) is installed in the cavity of the heat exchange box (21). An inner cavity is provided inside the heat exchange tube (31). The air delivery pipe (32) is installed on the furnace body (11) and is connected to the furnace cavity of the furnace body (11) and the inner cavity of the heat exchange tube (31). The oxygenation pipe (33) is installed on the heat exchange box (21) and communicated with the inner cavity of the heat exchange cylinder (31). The second valve (34) is installed on the oxygenation pipe (33). The bottom end of the motor (35) is connected to the top end of the furnace body (11). The bottom end of the reducer (36) is connected to the top end of the heat exchange box (21). The transmission shaft (37) is rotatably installed in the inner cavity of the heat exchange cylinder (31) and is longitudinally connected to the reducer (36). The three sets of fan blades (38) are all installed on the transmission shaft (37).

5. A low-nitrogen condensing hot water boiler as claimed in claim 4, characterized in that: The inflation mechanism (04) comprises an air pump (41), an air extraction pipe (42), an air supply pipe (43) and a check valve (44); the bottom end of the air pump (41) is connected to the top end of the furnace body (11); the air extraction pipe (42) is installed on the air pump (41) and communicates with the inner cavity of the heat exchange tube (31); the air supply pipe (43) is installed on the air pump (41); and the check valve (44) is installed on the air supply pipe (43).

6. A low-nitrogen condensing hot water boiler as claimed in claim 5, characterized in that: The treatment mechanism (05) comprises a treatment box (51), a partition (52) and a smoke exhaust pipe (53); the bottom end of the treatment box (51) is connected to the top end of the furnace body (11); a treatment chamber is arranged inside the treatment box (51); the partition (52) is installed in the treatment chamber of the treatment box (51) and divides the treatment chamber into a left part and a right part; a sodium hydroxide solution is stored in the right treatment chamber; the air supply pipe (43) extends below the liquid level of the solution in the right treatment chamber of the treatment box (51); activated carbon is stored in the left treatment chamber of the treatment box (51); the smoke exhaust pipe (53) is installed on the treatment box (51) and communicated with the inside of the left treatment chamber of the treatment box (51).

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