Condensing boiler with energy-saving and emission-reducing effect

Abstract

The present application relates to a condensing boiler furnace with energy-saving and emission-reducing effect, when the mixed gas as fuel is injected into the condensing boiler shell through the gas distribution plate, and then passes through the wind baffle and the flame stabilizing fire grate group, the mixed gas is dispersed into countless uniform small gas beams, and after the mixed gas is ignited, countless small flames are dispersed, so that the flame temperature is not too concentrated, and the unburned mixed gas continues to pass through the wind baffle under the action of wind pressure, so that the fuel and combustion air are further fully mixed, so that the combustion is more sufficient, and the condensing boiler is designed as a whole, adopts the inverted cold flame combustion technology, in the heat exchange fire grate group, the guiding dispersion fire grate group and the flame stabilizing fire grate group, the liquid water can exchange energy with the heat generated by the mixed gas combustion, the reverse heat exchange can rapidly reduce the temperature of the flame root, the flame presents blue flame state, the heat transfer is rapid, the heat exchange is sufficient, and the emission of thermal nitrogen oxides is effectively inhibited.

Description

Technical Field

[0001] This invention relates to a condensing boiler grate with energy-saving and emission-reduction effects, and particularly to a condensing boiler grate with energy-saving and emission-reduction effects applied in the field of condensing boilers. Background Technology

[0002] A boiler is a mechanical device that uses the heat energy of fuel or other energy sources to heat water into hot water or steam. Boilers can be classified according to fuel type, such as oil-fired boilers, gas-fired boilers, and biomass boilers. According to heating medium, they can be classified as hot water boilers, steam boilers, and thermal oil boilers. Boilers are an important energy equipment and a basic piece of equipment for many industrial production processes.

[0003] To address the issues associated with the use of gas-fired boilers, a certain gas-fired boiler on the market adopts a drum-type design and has a certain market share.

[0004] Most existing boilers are non-grate boilers, which have relatively low energy efficiency during operation and are prone to producing large amounts of polluting gases such as carbon monoxide and nitrogen oxides during combustion. Even if some boilers use grate structures, they are simple grates that do not contribute much to energy conservation and emission reduction. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the energy utilization efficiency of existing boilers is relatively low, and they are prone to producing a large amount of polluting gases such as carbon monoxide and nitrogen oxides due to combustion.

[0006] To address the aforementioned problems, this invention provides a condensing boiler grate with energy-saving and emission-reduction effects, comprising a condensing boiler shell, a gas distribution plate fixedly connected to the upper end of the condensing boiler shell, a flue gas chamber fixedly connected to the lower end of the condensing boiler shell, a flue gas outlet fixedly connected to the upper end of the flue gas chamber, and the flue gas outlet connecting the flue gas chamber to the external space, and two sets of water collection tanks fixedly connected to opposite side walls of the condensing boiler shell, the two sets of water collection tanks including, from bottom to top, water collection tank 1, water collection tank 2, water collection tank 3 and water collection tank 4, one end of each of the sets of water collection tanks 1 and 2 and water collection tanks 3 and 4 are respectively fixedly connected to a connecting elbow, and the connecting elbow connects the two ends, the other set of water collection tanks 2 and 3 are fixedly connected to a connecting elbow, and the connecting elbow connects the two ends, one end of one set of water collection tank 1 is connected to a water inlet, and one end of the other set of water collection tank 4 is fixedly connected to a water outlet;

[0007] The lower side of the gas distribution plate is provided with, from top to bottom, a flame stabilizing burner group, a guide and disperser burner group, and a heat exchanger burner group. The two ends of the flame stabilizing burner group penetrate the inner wall of the condensing boiler shell and extend into the two water collection tanks 4, and are connected to the two water collection tanks 4. Wind baffles with positions matching the flame stabilizing burner group are fixedly connected between the inner walls of the condensing boiler shell, and the wind baffles are located on the upper side of the flame stabilizing burner group. The wind baffles include multiple T-shaped segmented units. The two ends of the guide and disperser burner group penetrate the inner wall of the condensing boiler shell and extend into the two water collection tanks 3, and are connected to the two water collection tanks 3. The two ends of the heat exchanger burner group penetrate the inner wall of the condensing boiler shell and extend into the two water collection tanks 1 and 2, and are connected to the two water collection tanks 1 and 2, respectively.

[0008] In the aforementioned condensing boiler grate with energy-saving and emission-reduction effects, the energy utilization efficiency of the boiler is increased, and the polluting gases such as carbon monoxide and nitrogen oxides produced by combustion are significantly reduced.

[0009] As a further improvement of this application, the air distribution plate is a grille plate, and the grille gap on the grille plate matches the gap between multiple wind deflectors, so that after the mixed gas forms an air jet under the action of the air distribution plate, it is not easily re-integrated by the wind deflectors to form an airflow.

[0010] As a further improvement of this application, each of the two sets of water collection tanks 1, 2, 3 and 4 is fixedly connected with a partition plate. The partition plate divides the internal space of water collection tanks 1, 2, 3 and 4 into two non-connected parts, so that the flow direction of cooling water in water collection tanks 1, 2, 3 and 4 is S-shaped, increasing the water flow path and improving the heat exchange efficiency.

[0011] As a further improvement of this application, a temperature detection device is fixedly connected to the end of the water outlet away from the water collection tank. The temperature detection device includes a fixed frame, which is threadedly connected to the water outlet. A rotating shaft is fixedly connected to the end of the fixed frame near the water outlet, and the rotating shaft is coaxial with the water outlet. A rotating bushing is sleeved on the outside of the rotating shaft. A driven fan blade is fixedly connected to the outer wall of the rotating bushing. An installation groove is chiseled at the end of the driven fan blade away from the rotating bushing. A temperature sensor is fixedly connected in the installation groove. The temperature sensor can detect the temperature at multiple locations on the outlet cross section and can calculate the average temperature detected by the temperature sensor during the detection period, thereby reducing the influence of the temperature stratification phenomenon of the liquid water itself on the final detection result.

[0012] As a further improvement to this application, the connection between the driven fan blade and the rotating bushing is detachable, and the weight and fan surface tilt angle of the multiple driven fan blades are all different. The rotation speed of the driven fan blade under the action of liquid water can be changed by changing the weight and fan surface tilt angle of the driven fan blade. Under the same other conditions, the greater the weight of the driven fan blade and the smaller the fan surface tilt angle, the slower the rotation speed under the scouring of water at the same flow rate, and the better the continuity of the temperature measured by the temperature sensor. Similarly, the slower the rotation speed of the driven fan blade, the easier it is to stop without the action of other external forces, and it cannot drive the temperature sensor to rotate and detect the temperature.

[0013] As a further improvement to this application, the driven fan blades of different weights and fan tilt angles are coated with hydrophobic coatings of different colors, which facilitates the differentiation and installation work of the workers. At the same time, the surface of the driven fan blades is less likely to retain cooling water and is less likely to cause corrosion to the driven fan blades.

[0014] As another improvement of this application, multiple driven fan blades are also fixedly connected to the outer wall of the rotating bushing. In summary, in this application, when the mixed gas used as fuel is injected into the outer shell of the condensing boiler through the gas distribution plate, and then passes through the wind baffle and the flame stabilizing baffle group, the mixed gas is dispersed into countless uniform small gas streams. After the mixed gas is ignited, it forms countless dispersed small flames, so that the flame temperature is not too concentrated. Moreover, the unburned mixed gas continues to pass through the wind baffle under the action of wind pressure, so that the fuel and combustion air are further fully mixed, making the combustion more complete and avoiding fuel waste. The condensing boiler is an integrated design and adopts inverted cold flame combustion technology. In the heat exchange baffle group, the guide dispersion baffle group, and the flame stabilizing baffle group, liquid water can exchange energy with the heat generated by the combustion of the mixed gas. The reverse heat exchange can quickly reduce the temperature at the root of the flame, and the flame presents a blue flame state. The heat transfer is rapid and sufficient, effectively suppressing the emission of thermal nitrogen oxides. After the mixed gas is completely burned, it is discharged through the flue gas chamber and the flue gas outlet. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the condensing boiler grate according to the first embodiment of this application;

[0016] Figure 2 This is a front sectional view of the grate of a condensing boiler according to the first embodiment of this application;

[0017] Figure 3 This is a schematic diagram of the combination of flame stabilizer and wind deflector strip according to the first embodiment of this application;

[0018] Figure 4 This is a schematic diagram of the water flow structure within the heat exchange grate according to the first embodiment of this application.

[0019] Figure 5 This is an exploded view of the water outlet pipe and temperature detection device according to the second embodiment of this application;

[0020] Figure 6 A schematic diagram of the water outlet pipe equipped with a temperature detection device according to the second embodiment of this application;

[0021] Figure 7 A side view of the water outlet pipe equipped with a temperature detection device according to the second embodiment of this application;

[0022] Figure 8 A side view of the water outlet pipe equipped with a multiple temperature detection device according to the third embodiment of this application;

[0023] Figure 9 This is a schematic diagram of the structure of the multi-temperature detection device according to the third embodiment of this application;

[0024] Figure 10 This is a schematic diagram illustrating the effect of scale growth in the heat exchange vent on the heat exchange efficiency of this application.

[0025] The following are the labels in the diagram: 1. Condensing boiler shell, 2. Gas distribution plate, 3. Water collection tank group, 301 Water collection tank one, 302 Water collection tank two, 303 Water collection tank three, 304 Water collection tank four, 305 Water inlet, 306 Water outlet, 4. Flue gas chamber, 5. Flue gas outlet, 6. Flame stabilizing array group, 7. Wind baffle, 8. Guide and dispersed flame array group, 9. Heat exchange flame array group, 10. Fixed frame, 11. Rotating shaft sleeve, 12. Driven fan blade, 13. Mounting groove, 14. Temperature sensor. Detailed Implementation

[0026] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0027] First implementation method:

[0028] Figure 1-3The diagram illustrates a condensing boiler grate with energy-saving and emission-reduction effects, comprising a condensing boiler shell 1, a gas distribution plate 2 fixedly connected to the upper end of the condensing boiler shell 1, and a flue gas chamber 4 fixedly connected to the lower end of the condensing boiler shell 1. The condensing boiler shell 1 and the flue gas chamber 4 form a combustion space for the fuel gas. A flue gas outlet 5 is fixedly connected to the upper end of the flue gas chamber 4, and the flue gas outlet 5 connects the flue gas chamber 4 to the external space. Two sets of water collection tanks 3 are fixedly connected to opposite side walls of the condensing boiler shell 1. The two sets of water collection tanks 3, from bottom to top, include water collection tank 1 3. 01. Water collection tank 2 302, water collection tank 303 and water collection tank 4 304. One end of water collection tank 1 301 and water collection tank 2 302 and water collection tank 303 and water collection tank 4 304 are respectively fixedly connected to a connecting elbow, and the connecting elbow connects the two ends. Another set of water collection tank 2 302 and water collection tank 303 are fixedly connected to a connecting elbow, and the connecting elbow connects the two ends. One end of water collection tank 1 301 is connected to a water inlet 305, and one end of water collection tank 4 304 is fixedly connected to a water outlet 306.

[0029] The lower side of the gas distribution plate 2 is provided with, from top to bottom, a flame stabilizing burner group 6, a guide and disperser burner group 8, and a heat exchanger burner group 9. The two ends of the flame stabilizing burner group 6 penetrate the inner wall of the condensing boiler shell 1 and extend into the two water collection tanks 4 304, and are connected to the two water collection tanks 4 304. A wind baffle 7 is fixedly connected between the inner walls of the condensing boiler shell 1, and the wind baffle 7 is located on the upper side of the flame stabilizing burner group 6. The wind baffle 7 includes multiple T-shaped segmented units. The two ends of the guide and disperser burner group 8 penetrate the inner wall of the condensing boiler shell 1 and extend into the two water collection tanks 3 303, and are connected to the two water collection tanks 3 303. The two ends of the heat exchanger burner group 9 penetrate the inner wall of the condensing boiler shell 1 and extend into the two water collection tanks 1 301 and 2 302, and are connected to the two water collection tanks 1 301 and 2 302, respectively.

[0030] Please refer to the following first. Figure 4 On the other hand, the liquid water for cooling enters the water collection tank 301 at one end through the inlet 305, and flows to the other water collection tank 301 under the action of the heat exchange fire row group 9. Then it enters the water collection tank 302 through the connecting elbow. Then, under the action of the connecting elbow of the heat exchange fire row group 9, the liquid water enters the other water collection tank 302 and the water collection tank 303 in turn. Then, it passes through the guide and disperse fire row group 8, the water collection tank 303, a water collection tank 4 304, the flame stabilizing fire row group 6 and another water collection tank 4 304 in sequence, and is discharged through the outlet 306.

[0031] On the other hand, when the mixed gas used as fuel is injected into the outer shell 1 of the condensing boiler through the gas distribution plate 2, and then passes through the wind baffle 7 and the flame stabilizing baffle group 6, the mixed gas is dispersed into countless uniform small gas streams. After the mixed gas is ignited, it becomes countless dispersed small flames, so that the flame temperature is not too concentrated. Moreover, the unburned mixed gas continues to pass through the wind baffle 7 under the action of wind pressure, so that the fuel and combustion air are further fully mixed, making the combustion more complete and avoiding fuel waste. The condensing boiler is an integrated design and adopts inverted cold flame combustion technology. In the heat exchange baffle group 9, the guide dispersion baffle group 8 and the flame stabilizing baffle group 6, liquid water can exchange energy with the heat generated by the combustion of the mixed gas. The reverse heat exchange can quickly reduce the temperature at the root of the flame, and the flame presents a blue flame state. The heat transfer is rapid and the heat exchange is sufficient, effectively suppressing the emission of thermal nitrogen oxides. After the mixed gas is completely burned, it is discharged through the flue gas chamber 4 and the flue gas outlet 5.

[0032] The air distribution plate 2 is a grid plate. The grid gap on the grid plate matches the gap between the multiple wind deflectors 7, so that after the mixed gas forms an air bundle under the action of the air distribution plate 2, it is not easy for the wind deflectors 7 to re-integrate into airflow.

[0033] Please see Figure 4 Each of the two sets of water collection tanks 301, 302, 303, and 304 is fixedly connected with a partition plate. The partition plate divides the internal space of the water collection tanks 301, 302, 303, and 304 into two non-connected parts, so that the flow direction of the cooling water in the water collection tanks 301, 302, 303, and 304 is S-shaped, which increases the water flow path and improves the heat exchange efficiency.

[0034] Second implementation method:

[0035] Please see Figure 5-7 A temperature detection device is fixedly connected to the end of the outlet 306 away from the water collection tank 304. The temperature detection device includes a fixed frame 10, and the fixed frame 10 is threadedly connected to the outlet 306. A rotating shaft is fixedly connected to the end of the fixed frame 10 near the outlet 306, and the rotating shaft is coaxial with the outlet 306. A rotating shaft sleeve 11 is sleeved on the outside of the rotating shaft. A driven fan blade 12 is fixedly connected to the outer wall of the rotating shaft sleeve 11. An installation groove 13 is chiseled at the end of the driven fan blade 12 away from the rotating shaft sleeve 11. A temperature sensor 14 is fixedly connected in the installation groove 13.

[0036] The special temperature sensor 14 should also be connected to a data processing terminal to process the real-time data detected by the temperature sensor 14, and to issue an alarm in a timely manner when the data is abnormal, and to contact the staff for corresponding maintenance work. This is a well-known technology to those skilled in the art, and therefore is not disclosed in detail in this application.

[0037] Please see Figure 10 When the cooling liquid water exchanges heat with the heat generated by the combustion of the mixed gas in the heat exchanger group 9, the guide and disperser group 8, and the flame stabilizing group 6, the temperature of the liquid water will change drastically during the above process. Scale will form on the inner walls of the heat exchanger group 9, the guide and disperser group 8, and the flame stabilizing group 6. As the scale grows, it will affect the heat exchange efficiency between the liquid water and the heat generated by the combustion of the mixed gas. The condensing boiler shell 1 will not be able to maintain a cold flame combustion state, and thermal nitrogen oxides will easily be generated, causing serious environmental pollution.

[0038] In this implementation method, a temperature detection device is installed at the opening of the outlet 306 to detect the temperature of the liquid water discharged from the outlet 306. Based on the temperature of the liquid water, the heat exchange efficiency in the heat exchange burner group 9, the guiding and dispersing burner group 8, and the stabilizing burner group 6 is calculated. This allows the determination of whether scale has formed on the inner walls of the heat exchange burner group 9, the guiding and dispersing burner group 8, and the stabilizing burner group 6, affecting the normal heat exchange operation. The driven fan blade 12 rotates automatically under the continuous flushing of the liquid water, allowing the temperature sensor 14 to detect the temperature at multiple locations on the outlet section of the outlet 306. The average temperature detected by the temperature sensor 14 can be calculated over the detection period, reducing the impact of temperature stratification of the liquid water on the final detection result.

[0039] The connection between the driven fan blade 12 and the rotating bushing 11 is detachable, and the weight and fan surface tilt angle of the multiple driven fan blades 12 are different. The rotation speed of the driven fan blade 12 under the action of liquid water can be changed by changing the weight and fan surface tilt angle of the driven fan blade 12. Under the same other conditions, the greater the weight of the driven fan blade 12 and the smaller the fan surface tilt angle, the slower the rotation speed under the scouring of water at the same flow rate, and the better the continuity of the temperature measured by the temperature sensor 14. Similarly, the slower the rotation speed of the driven fan blade 12, the easier it is to stop without the action of other external forces, and it is impossible to drive the temperature sensor 14 to perform rotation temperature detection. The surfaces of the driven fan blades 12 with different weights and fan surface tilt angles are coated with hydrophobic coatings of different colors, which facilitates the differentiation and installation work of the workers. At the same time, the surface of the driven fan blade 12 is not easy to retain cooling water and is not easy to cause corrosion to the driven fan blade 12.

[0040] The third implementation method:

[0041] Please see Figure 8-9Compared with the second embodiment, in this embodiment, a plurality of driven fan blades 12 are fixedly connected to the rotating bushing 11 of the temperature detection device. Each of the driven fan blades 12 has a mounting groove 13 cut at the end away from the rotating bushing 11. A temperature sensor 14 matching itself is fixedly connected in the mounting groove 13. The temperature detection device with a plurality of driven fan blades 12 connected to the rotating bushing 11 is named a multiple temperature detection device. Compared with the second embodiment, in this application, the water temperature is detected by multiple temperature sensors 14 in combination, and the average value of the detected data is calculated to represent the coolant temperature, which is more accurate. At the same time, the multiple temperature sensors 14 can also form a control group with each other. The temperature difference detected can be used to detect the faulty temperature sensor 14 in time, and the erroneous data of the faulty temperature sensor 14 can be eliminated in time. At the same time, the temperature of the liquid water discharged from the outlet 306 can be continuously detected.

[0042] Compared to the first embodiment, the second and third embodiments, by installing a temperature detection device at the outlet 306, detect the temperature of the discharged liquid water, thereby determining the heat exchange efficiency of the liquid water in the heat exchange burner group 9, the guiding and dispersing burner group 8, and the flame stabilizing burner group 6. When the heat exchange efficiency of the liquid water is too low, the condensing boiler shell 1 and the flue gas chamber 4 cannot maintain a low-temperature environment, and the combustion of the mixed gas cannot maintain the inverted cold flame combustion state, easily generating thermal nitrogen oxides, causing serious environmental pollution, requiring timely shutdown and maintenance. However, the introduction of the temperature detection device in the second and third embodiments increases the operating cost, requiring those skilled in the art to make a reasonable choice based on the actual situation. Considering the current practical needs, the above-mentioned embodiments adopted in this application are not limited to these. Various changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A condensing boiler grate with energy-saving and emission-reduction effects, characterized in that: The boiler includes a condensing boiler shell (1), with a gas distribution plate (2) fixedly connected to the upper end of the condensing boiler shell (1), a flue gas chamber (4) fixedly connected to the lower end of the condensing boiler shell (1), and a flue gas outlet (5) fixedly connected to the upper end of the flue gas chamber (4), the flue gas outlet (5) connecting the flue gas chamber (4) to the outside space. Two sets of water collection tanks (3) are fixedly connected to the opposite side walls of the condensing boiler shell (1). The two sets of water collection tanks (3) include, from bottom to top, water collection tank one (301) and water collection tank two (302) (303) (304) (305) (306) (307) (308) (309 ... 302), water collection tank three (303) and water collection tank four (304), one end of water collection tank one (301) and water collection tank two (302) and water collection tank three (303) and water collection tank four (304) are respectively fixedly connected to a connecting elbow, and the connecting elbow connects the two ends. Another set of water collection tank two (302) and water collection tank three (303) are fixedly connected to a connecting elbow, and the connecting elbow connects the two ends. One end of water collection tank one (301) is connected to a water inlet (305). The other set of water collection tanks A water outlet (306) is fixedly connected to one end of the fourth collection tank (304). A temperature detection device is fixedly connected to the end of the water outlet (306) away from the fourth collection tank (304). The temperature detection device includes a fixed frame (10), and the fixed frame (10) is threadedly connected to the water outlet (306). A rotating shaft is fixedly connected to the end of the fixed frame (10) near the water outlet (306), and the rotating shaft is coaxial with the water outlet (306). A rotating shaft sleeve (11) is fitted on the outside of the rotating shaft. A driven fan blade (12) is fixedly connected to the outer wall of the sleeve (11), and the connection between the rotating bushing (11) and the driven fan blade (12) is a detachable fixed connection. A mounting groove (13) is chiseled at the end of the driven fan blade (12) away from the rotating bushing (11). A temperature sensor (14) is fixedly connected in the mounting groove (13). The weight and fan tilt angle of the multiple driven fan blades (12) are different. The surfaces of the driven fan blades (12) with different weights and fan tilt angles are coated with hydrophobic coatings of different colors. The lower side of the gas distribution plate (2) is provided with a flame stabilizing fire row group (6), a guide and dispersion fire row group (8), and a heat exchange fire row group (9) arranged sequentially from top to bottom. The two ends of the flame stabilizing fire row group (6) penetrate the inner wall of the condensing boiler shell (1) and extend into the two water collection tanks (304), and are connected to the two water collection tanks (304). The inner walls of the condensing boiler shell (1) are fixedly connected with wind baffles (7) whose positions match those of the flame stabilizing fire row group (6), and the wind baffles (7) are located on the upper side of the flame stabilizing fire row group (6). The wind baffles (7) include multiple T-shaped sections. The cutting unit, the two ends of the guide and dispersed fire bar group (8) respectively penetrate through the inner wall of the condensing boiler shell (1) and extend into the two water collection tanks three (303), and are connected to the two water collection tanks three (303). The two ends of the heat exchange fire bar group (9) respectively penetrate through the inner wall of the condensing boiler shell (1) and extend into the two water collection tanks one (301) and two water collection tanks two (302), and are connected to the two water collection tanks one (301) and two water collection tanks two (302). The gas distribution plate (2) is a grid plate, and the grid gap on the grid plate matches the gap between the multiple wind baffles (7).

2. The condensing boiler grate with energy-saving and emission-reduction effects according to claim 1, characterized in that: Each of the two sets of water collection tanks (301, 302, 303, and 404) is fixedly connected with a partition plate, which divides the internal space of the water collection tank into two unconnected parts.

3. The condensing boiler grate with energy-saving and emission-reduction effects according to claim 1, characterized in that: A driven fan blade (12) is also fixedly connected to the outer wall of the rotating bushing (11).

4. A condensing boiler grate with energy-saving and emission-reduction effects according to claim 1, characterized in that: Multiple driven fan blades (12) are also fixedly connected to the outer wall of the rotating bushing (11).

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