A high-power full-convection condensing low-nitrogen boiler system

Abstract

A high-power full-convection condensing low-nitrogen boiler system, including a boiler, a burner, a condenser, a smoke return system, an inlet and outlet water system, an ignition and fire detector, etc.; by utilizing efficient condensation waste heat recovery and low-nitrogen combustion technology, and rationally designing and optimizing the structural layout, materials used, combustion mode and automatic control of the entire system, a full-convection condensing low-nitrogen boiler system that can meet customers' high-power heat needs is realized. Compared with traditional boiler systems, it has high combustion intensity, short flame, large area heat intensity and volume heat intensity, shortens the furnace height, brings the flame surface close to the heat exchanger, and improves the boiler heat transfer coefficient; it can absorb most of the sensible heat of the high-temperature flue gas discharged by the boiler and the latent heat released by the condensation of water vapor, and reduce the exhaust temperature to room temperature, reduce exhaust heat loss, and improve the thermal efficiency and energy-saving effect of the boiler system; both nitrogen oxides and CO concentrations after combustion can achieve ultra-low emissions, meeting environmental protection requirements.

Description

Technical Field

[0001] The present invention relates to the field of low-nitrogen boilers and combustion technology, and in particular to a high-power full-convection condensing low-nitrogen boiler system. Background Art

[0002] Condensing low nitrogen gas boiler system, its low nitrogen combustion technology is to improve the combustion equipment and control the combustion conditions to reduce the NO in the combustion exhaust gas X At the same time, full convection condensing technology is added to it, which increases the heat exchange coefficient, saves gas consumption, reduces the exhaust temperature, and makes the thermal efficiency as high as 107% under the premise of more complete combustion. Compared with ordinary gas boilers, the full convection condensing low-nitrogen boiler system has lower energy consumption, is more low-carbon and environmentally friendly, and can reach or even exceed the national first-level energy consumption. Since the combustion chamber of the condensing low-nitrogen boiler system is made of 310S stainless steel, it has good acid corrosion resistance and a service life of more than 20 years. The heating boilers currently available on the market can only reach 40KW, and the heating temperature and area are limited. This requires the development of a condensing low-nitrogen boiler system that can meet customers' high-power heat needs. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-power full-convection condensing low-nitrogen boiler system in order to solve the above problems.

[0004] In order to solve the above problems, the present invention provides a technical solution: a high-power full-convection condensing low-nitrogen boiler system, including a boiler, a burner, a combustion chamber, a condenser, a smoke hood, a smoke return valve, a combustion-supporting air valve, an air mixing chamber, a combustion-supporting fan, a gas valve, a thermometer, a boiler exhaust valve, a boiler water inlet valve, a boiler water outlet valve, a boiler sewage valve and an ignition and fire detector; the top of the boiler is fixedly connected to a smoke hood; the upper end of the left side of the boiler is fixedly connected to a boiler water inlet valve, and the left end of the boiler water inlet valve is connected to a thermometer and a boiler exhaust valve; the middle end of the left side of the boiler is fixedly connected to a boiler Water outlet valve, a thermometer and a boiler drain valve are connected to the left end of the boiler water outlet valve; a burner is provided at the bottom end of the interior of the boiler chamber; a gas valve is fixedly connected to the lower end of the left side of the boiler, and the gas valve is communicated with the burner; a combustion chamber is provided above the burner; a condenser is provided above the combustion chamber; an air mixing chamber is provided on one side of the boiler, and a smoke return valve, a combustion-supporting air valve and a combustion-supporting fan are respectively connected to the air mixing chamber; the air outlet end of the combustion-supporting fan is aligned with the interior of the combustion chamber; the other end of the smoke return valve is communicated with the smoke collecting hood through a pipe; the ignition and fire detector are arranged above the burner.

[0005] Preferably, it also includes a water tank, a water tank drain valve, a water tank outlet valve, a circulating pump, a first water tank return valve, a flow meter, a user-end drain valve and a second water tank return valve; the lower end of the left side of the water tank is fixedly connected to the water tank drain valve, and the lower end of the right side of the water tank is fixedly connected to the water tank outlet valve; the upper end of the right side of the water tank is fixedly connected to the first water tank return valve and the second water tank return valve, and the first water tank return valve is located below the second water tank return valve; the right end of the water tank outlet valve is connected to the circulating pump, the flow meter and the boiler inlet valve in sequence through a pipeline; the right end of the first water tank return valve is connected between the circulating pump and the flow meter through a pipeline; the right end of the second water tank return valve is connected to the user-end drain valve and the boiler outlet valve in sequence through a pipeline.

[0006] Preferably, the water tank drain valve, water tank outlet valve, first water tank return valve, user-end drain valve and second water tank return valve are all ball valves.

[0007] Preferably, the boiler is a full convection condensing low-nitrogen boiler.

[0008] Preferably, the burner is an anti-backfire low-nitrogen burner.

[0009] Preferably, the burner is composed of multiple levels of fire rows in parallel, the air inlet of the fire row is inclined from bottom to top toward the outside of the shell, the drainage portion is inclined from bottom to top toward the middle of the shell, and the lower end width of the drainage portion is greater than the upper end width.

[0010] Preferably, the finned tubes of the condenser are provided with rotating turbulents for enhancing the heat exchange efficiency between the internal water and the external high-temperature flue gas.

[0011] Preferably, the front end of the burner nozzle is provided with an air distribution plate for enhancing the uniformity of mixing wind and gas.

[0012] Beneficial effects of the present invention: The present invention utilizes efficient condensation waste heat recovery technology and low-nitrogen combustion technology, and rationally designs and optimizes the structural layout, materials used, combustion mode and automatic control system of the entire boiler system, thereby realizing a full-convection condensing low-nitrogen boiler system that can meet customers' high-power heat needs. Compared with traditional boiler systems, the combustion intensity is high, the flame is short, and it has a larger area heat intensity and volume heat intensity. The furnace height is shortened, and the flame surface is close to the heat exchanger, which greatly improves the boiler heat transfer coefficient; it absorbs most of the sensible heat in the high-temperature flue gas discharged by the boiler and the latent heat released by the condensation of water vapor, and reduces the exhaust gas temperature to room temperature, thereby minimizing the exhaust gas heat loss and greatly improving the thermal efficiency and energy-saving effect of the boiler system; the concentrations of nitrogen oxides and CO after combustion can achieve ultra-low emissions, meeting environmental protection requirements. This invention solves the problem of limited power use in the current market, reduces customers' use costs, saves national energy, has significant economic benefits, and can comply with national energy-saving industry policies. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the system layout of the present invention.

[0014] Figure 2 Schematic diagram of part of the structure of the present invention Figure 1 .

[0015] Figure 3 Schematic diagram of part of the structure of the present invention Figure 2 .

[0016] Figure 4 This is a schematic diagram of the structure of the condenser heat exchange tube of the present invention. DETAILED DESCRIPTION

[0017] like Figures 1 to 4As shown, this specific embodiment adopts the following technical solutions: a high-power full-convection condensing low-nitrogen boiler system, including a boiler 1, a burner 2, a combustion chamber 3, a condenser 4, a smoke hood 5, a smoke return valve 6, a combustion-supporting air valve 7, an air mixing chamber 8, a combustion-supporting fan 9, a gas valve 10, a thermometer 17, a boiler exhaust valve 18, a boiler water inlet valve 19, a boiler water outlet valve 20, a boiler sewage valve 21 and an ignition and fire detector 24; the top of the boiler 1 is fixedly connected to the smoke hood 5; the upper end of the left side of the boiler 1 is fixedly connected to the boiler water inlet valve 19, and the left end of the boiler water inlet valve 19 is connected to the thermometer 17 and the boiler exhaust valve 18; the middle end of the left side of the boiler 1 is fixedly connected to the boiler outlet valve Water valve 20, the left end of the boiler water outlet valve 20 is connected to a thermometer 17 and a boiler drain valve 21; a burner 2 is provided at the bottom end of the inner chamber of the boiler 1; a gas valve 10 is fixedly connected to the lower end of the left side of the boiler 1, and the gas valve 10 is communicated with the burner 2; a combustion chamber 3 is provided above the burner 2; a condenser 4 is provided above the combustion chamber 3; an air mixing chamber 8 is provided on one side of the boiler 1, and a smoke return valve 6, a combustion-supporting air valve 7 and a combustion-supporting fan 9 are respectively connected to the air mixing chamber 8; the air outlet end of the combustion-supporting fan 9 is aligned with the interior of the combustion chamber 3; the other end of the smoke return valve 6 is communicated with the smoke collecting hood 5 through a pipe; the ignition and fire detector 24 is arranged above the burner 2. The burner 2 adopts a fully enclosed combustion technology. After the gas and the combustion-supporting air are evenly mixed, they are fully burned in a closed and insulated combustion chamber through an automatic igniter to generate hot flue gas, which is monitored in real time by an ultraviolet fire detector. The hot flue gas is connected to the heat exchange condenser, the flue gas goes through the shell, and the water goes through the finned tubes, making full use of the high-temperature exhaust flue gas to exchange heat for the newly entered water to the temperature required by the user; the condensed flue gas is discharged from the smoke collection hood, so that the exhaust flue gas temperature is about 30℃~50℃, reducing the heat loss of the exhaust gas and greatly improving the thermal efficiency and energy-saving effect of the boiler system; a mixed air chamber is provided on one side of the boiler, and a return smoke valve, a combustion-supporting air valve and a combustion-supporting fan are respectively connected to the mixed air chamber; the air outlet end of the combustion-supporting fan is aligned with the inside of the combustion chamber; the other end of the return smoke valve is connected to the smoke collection hood through a pipe; the air volume ratio of the return smoke and combustion-supporting air can be adjusted according to the combustion needs.

[0018] like Figures 1 to 4As shown, it also includes a water tank 11, a water tank drain valve 12, a water tank outlet valve 13, a circulating pump 14, a first water tank return valve 15, a flow meter 16, a user-end drain valve 22 and a second water tank return valve 23; the lower end of the left side of the water tank 11 is fixedly connected to the water tank drain valve 12, and the lower end of the right side of the water tank 11 is fixedly connected to the water tank outlet valve 13; the upper right side of the water tank 11 is fixedly connected to the first water tank return valve 15 and the second water tank return valve 23, and the first water tank return valve 15 is located below the second water tank return valve 23; the right end of the water tank outlet valve 13 is connected to the circulating pump 14, the flow meter 16 and the boiler inlet valve 19 in sequence through a pipeline; the right end of the first water tank return valve 15 is connected between the circulating pump 14 and the flow meter 16 through a pipeline; the right end of the second water tank return valve 23 is connected to the user-end drain valve 22 and the boiler outlet valve 20 in sequence through a pipeline. Among them, the water tank drain valve 12, the water tank outlet valve 13, the first water tank return valve 15, the user end drain valve 22 and the second water tank return valve 23 are all ball valves;

[0019] The boiler 1 is a full convection condensing low-nitrogen boiler, which can absorb most of the sensible heat in the high-temperature flue gas discharged by the boiler and the latent heat released by the condensation of water vapor, and reduce the exhaust gas temperature to room temperature, thereby minimizing the exhaust gas heat loss and greatly improving the thermal efficiency and energy-saving effect of the boiler system; the burner 2 is an anti-backfire low-nitrogen burner, which adopts premixed low-nitrogen combustion technology, firstly mixes the air and gas in the required proportions through valve adjustment and then performs dispersed combustion, so that the combustion is more complete, the combustion intensity is high, and the area heat intensity and volume heat intensity are greater, the gas utilization rate and combustion efficiency are higher, no gas is wasted, and the combustion flame is uniform and not concentrated, which greatly reduces NO X Generation; the burner 2 is composed of multiple fire rows in parallel, the air inlet of the fire row is inclined from bottom to top toward the outside of the shell, and the guide part is inclined from bottom to top toward the middle of the shell, and the lower end width of the guide part is greater than the upper end width, which can effectively avoid backfire; the finned tubes of the condenser 4 are provided with rotating turbulents that enhance the heat exchange efficiency between internal water and external high-temperature flue gas; the front end of the nozzle of the burner 2 is provided with an air distribution plate that enhances the uniformity of wind and air mixing, so as to enhance the uniformity of wind and air mixing and ensure stable operation of the equipment. This control system integrates automation and adopts PLC+touch screen control mode with centralized control and simple operation to achieve accurate and stable ratio adjustment of gas and combustion-supporting air.

[0020] The working principle of the present invention is: by utilizing efficient condensation waste heat recovery technology and low-nitrogen combustion technology, the structural layout, materials used, combustion mode and automatic control system of the entire boiler system are reasonably designed and optimized, and a full-convection condensing low-nitrogen boiler system that can meet customers' high-power heat needs is designed. The concentrations of nitrogen oxides and CO after combustion are required to achieve ultra-low emissions, and the sensible heat in most of the high-temperature flue gas discharged by the boiler and the latent heat released by the condensation of water vapor are absorbed, the exhaust gas temperature is reduced to room temperature, the exhaust gas heat loss is minimized, and the thermal efficiency and energy-saving effect of the boiler system are greatly improved.

[0021] In the description of the invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0022] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "setting", "connection", "fixation", and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two elements or an interaction relationship between two elements. Unless otherwise clearly specified, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0023] The above shows and describes the basic principles, main features and advantages of the invention. Those skilled in the art should understand that the invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the invention. Without departing from the spirit and scope of the invention, the invention may be subject to various changes and improvements, which shall fall within the scope of the invention to be protected. The scope of protection of the invention shall be defined by the accompanying claims and their equivalents.

[0024] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices. Therefore, the control method and wiring layout are no longer explained in detail in the present invention.

Claims

1. A high-power full-convection condensing low-nitrogen boiler system, characterized by: It includes a boiler (1), a burner (2), a combustion chamber (3), a condenser (4), a smoke hood (5), a smoke return valve (6), a combustion air valve (7), an air mixing chamber (8), a combustion air fan (9), a gas valve (10), a water tank (11), a water tank drain valve (12), a water tank outlet valve (13), a circulating pump (14), a first water tank return valve (15), a flow meter (16), a thermometer (17), a boiler exhaust valve (18), a boiler inlet valve (19), a boiler outlet valve (20), a boiler blowdown valve (21), a user-end drain valve (22), a second water tank return valve (23), and an ignition and fire detector (24); The top of the boiler (1) is fixedly connected to a smoke collecting hood (5); The upper end of the left side surface of the boiler (1) is fixedly connected to a boiler water inlet valve (19), and the left end of the boiler water inlet valve (19) is connected to a thermometer (17) and a boiler exhaust valve (18); The middle end of the left side of the boiler (1) is fixedly connected to a boiler outlet valve (20), and the left end of the boiler outlet valve (20) is connected to a temperature measuring instrument (17) and a boiler drain valve (21); A burner (2) is provided at the bottom end of the inner chamber of the boiler (1); A gas valve (10) is fixedly connected to the lower end of the left side of the boiler (1), and the gas valve (10) is connected to the burner (2); A combustion chamber (3) is provided above the burner (2); A condenser (4) is provided above the combustion chamber (3); An air mixing chamber (8) is provided on one side of the boiler (1), and a smoke return valve (6), a combustion-supporting air valve (7), and a combustion-supporting fan (9) are respectively connected to the air mixing chamber (8); The air outlet end of the combustion-supporting fan (9) is aligned with the interior of the combustion chamber (3); The other end of the smoke return valve (6) is connected to the smoke collecting hood (5) through a pipe; The ignition and fire detector (24) is arranged above the burner (2); The lower end of the left side of the water tank (11) is fixedly connected to a water tank drain valve (12), and the lower end of the right side of the water tank (11) is fixedly connected to a water tank outlet valve (13); A first water tank return valve (15) and a second water tank return valve (23) are fixedly connected at the upper end of the right side surface of the water tank (11), and the first water tank return valve (15) is located below the second water tank return valve (23); The right end of the water tank outlet valve (13) is connected to the circulation pump (14), the flow meter (16) and the boiler water inlet valve (19) in sequence through pipelines; The right end of the first water tank return valve (15) is connected between the circulation pump (14) and the flow meter (16) through a pipeline; The right end of the second water tank return valve (23) is connected to the user-end drain valve (22) and the boiler outlet valve (20) in sequence through a pipeline; the water tank drain valve (12), the water tank outlet valve (13), the first water tank return valve (15), the user-end drain valve (22) and the second water tank return valve (23) are all ball valves; the boiler (1) is a full convection condensing low-nitrogen boiler; the burner (2) is an anti-backfire low-nitrogen burner; the burner (2) is composed of multiple fire rows in parallel, the air inlet part of the fire row piece is inclined from bottom to top toward the outside of the shell, and the drainage part is inclined from bottom to top toward the middle of the shell, and the lower end width of the drainage part is greater than the upper end width; the finned tube of the condenser (4) is provided with a rotating turbulent to enhance the heat exchange efficiency between the internal water and the external high-temperature flue gas; the front end of the nozzle of the burner (2) is provided with an air distribution plate to enhance the uniformity of wind and gas mixing.

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