Winding smoke gas cooling device for gas-fired boiler

Abstract

The invention discloses a smoke entrainment gas cooling device for a gas-fired boiler, and belongs to the technical field of gas-fired boilers. The device comprises a water-cooled wall, upper and lower water-cooled tube panels, left and right water-cooled tube panels and an injection chamber. According to the working principle, smoke entrainment is enhanced through the pressure difference formed by high-speed jet flow of the combustor in the injection chamber, so that high-temperature smoke flows through the water-cooled tube panels arranged on the periphery of an inlet of the injection chamber. Circulating water in the water cooling wall is used as a cooling medium to absorb heat, and the temperature of entrainment smoke can be reduced by about 20-70 DEG C, so that the flame temperature of a combustion area is reduced, and the generation of NOx is remarkably reduced. The device is simple in structure and easy to install and overhaul, emission is reduced, meanwhile, the working environment of the burner can be effectively improved, and the service life of the burner is prolonged.

Description

Technical Field

[0001] This application belongs to the field of gas boiler technology, and in particular relates to a gas-fired boiler flue gas cooling device. Background Technology

[0002] With increasingly stringent environmental protection requirements, the original NOx emissions from boilers are becoming more stringent. x Emission requirements are becoming increasingly stringent. Most commonly used burners utilize the principle of entraining flue gas around the flame, aiming to reduce the oxygen concentration and combustion temperature in the main combustion zone, thereby suppressing NOx emissions. x The generation of [something]. However, the flue gas entrained around the flame is itself at a high temperature. If the initial temperature of this entrained gas can be effectively reduced, the temperature of the main combustion zone can be reduced more significantly, further enhancing the emission reduction effect.

[0003] Therefore, developing a cooling device that can both enhance flue gas entrainment and achieve efficient cooling is of great significance for energy conservation and emission reduction of gas-fired boilers. Summary of the Invention

[0004] The purpose of this application is to provide a flue gas cooling device for a gas-fired boiler. By arranging a water-cooling device around the burner, the temperature of the flue gas entrained into the flame is reduced, thereby lowering the combustion temperature and reducing NO. x The generation of .

[0005] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows: A flue gas cooling device for a gas-fired boiler includes: a water-cooled wall, upper and lower water-cooled tube panels and left and right water-cooled tube panels disposed on the water-cooled wall, and an ejector chamber fixed on the burner nozzle; the ejector chamber is located at the burner outlet end and uses the pressure difference generated by the burner jet to entrain surrounding flue gas; the upper and lower water-cooled tube panels and the left and right water-cooled tube panels are arranged around the flue gas inlet of the ejector chamber and are all connected to the water-cooled wall, using water in the water-cooled wall as a cooling medium to cool the flue gas.

[0006] Optionally, the upper and lower water-cooled tube panels are symmetrically arranged at the upper and lower ends of the burner; each end consists of nine sets of water-cooled panels, and each set of water-cooled panels includes three water-cooled tubes, which are led out from the same wall tube of the water-cooled wall.

[0007] Optionally, the left and right water-cooled tube screens are symmetrically arranged on the left and right sides of the burner; each end consists of three sets of water-cooled screens, each set of water-cooled screens includes three water-cooled tubes, and the water-cooled tubes are led out from the same wall tube of the water-cooled wall.

[0008] Optionally, the ejector chamber is fixed to the burner nozzle by a bracket.

[0009] Compared with the prior art, the beneficial effects of the embodiments of this application are: This application provides a flue gas entrainment cooling device for a gas-fired boiler. The high-speed jet from the burner reduces the pressure inside the ejector chamber, creating a pressure difference with the surrounding environment. This entrains the surrounding flue gas into the ejector chamber. Since the flue gas temperature around the burner is typically high, directly entraining it into the combustion zone would increase the combustion temperature. Therefore, a flue gas entrainment water-cooling device (including: water-cooled walls, upper and lower water-cooled tube panels, left and right water-cooled tube panels, and the ejector chamber) is arranged around the inlet of the ejector chamber. Water from the water-cooled walls is used as the cooling medium. By drawing water from the water-cooled walls, the entrained flue gas is cooled, thereby reducing the combustion temperature and thus reducing NO₂. x The cooling device can also reduce the temperature of the flue gas around the burner, which helps to improve the service life of the burner nozzle. It is also simple in structure and easy to install and maintain. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This paper shows an arrangement diagram of a flue gas cooling device for a gas-fired boiler provided in an embodiment of this application.

[0012] Figure 2 It shows Figure 1 View A in the diagram.

[0013] Illustration: 1. Water-cooled wall; 2. Upper and lower water-cooled tube panels; 3. Left and right water-cooled tube panels; 4. Injector chamber. Detailed Implementation

[0014] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0015] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0017] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0018] Please see Figure 1 and Figure 2 As shown, this embodiment provides a flue gas cooling device for a gas-fired boiler, which enhances the entrainment of flue gas around the burner, while reducing the temperature of the entrained flue gas, thereby reducing the combustion temperature of the flame and reducing NO. x The device generates energy. While achieving energy conservation and emission reduction, it also features a simple structure and is easy to install and maintain.

[0019] Specifically, the aforementioned flue gas cooling device for gas-fired boilers includes a water-cooled wall 1, upper and lower water-cooled tube panels 2, left and right water-cooled tube panels 3, and an ejector chamber 4. The high-speed jet generated by the burner reduces the internal pressure of the ejector chamber 4, thereby creating a certain pressure difference with the surrounding environment, which in turn draws the flue gas around the burner into the ejector chamber 4.

[0020] In this embodiment, left and right water-cooled tube screens 3 are arranged on the left and right sides of the inlet of the ejector chamber 4, and upper and lower water-cooled tube screens 2 are arranged on the upper and lower sides. These water-cooled tube screens are connected to the water-cooled wall 1, and the circulating water in the water-cooled wall 1 is used as the cooling medium. When the entrained high-temperature flue gas flows through the upper and lower water-cooled tube screens 2 and the left and right water-cooled tube screens 3, the heat of the flue gas is absorbed and carried away by the cooling water flowing upward in the tube screens. At this time, the flue gas temperature can be reduced by about 20-70°C. The cooled flue gas then enters the combustion zone, which can significantly reduce the flame temperature and reduce NO. x The generation of [something] achieves the effect of energy conservation and emission reduction.

[0021] Therefore, by configuring an ejector chamber 4 at the burner outlet, the pressure difference generated by its high-speed jet enhances the flue gas entrainment effect. Simultaneously, water-cooled tube panels connected to the water-cooled wall 1 are arranged around the flue gas inlet of the ejector chamber 4. When the entrained high-temperature flue gas passes through the water-cooled tube panel, some of its heat is carried away by the circulating cooling water, reducing the flue gas temperature entering the combustion zone by 20-70℃. This effectively reduces the overall temperature of the combustion zone, thereby reducing NO₂ levels. x The purpose of emissions.

[0022] As an example, the upper and lower water-cooled tube panels 2 are arranged at the upper and lower ends of the burner. The structures at both ends are the same. Each end consists of nine sets of water-cooled panels. Each set of water-cooled panels has three water-cooled tubes. Water is drawn from the wall tube of the same water-cooled wall 1, circulated, and then enters the raw water pipe. The left and right water-cooled tube panels 3 are arranged on the left and right sides of the burner. The structures at both ends are the same, each consisting of three sets of water-cooled panels. Each set of water-cooled panels has three water-cooled tubes, which draw water from the wall tube of the same water-cooled wall 1, circulate it, and then enter the raw water pipe. The ejector chamber 4 is connected to the burner nozzle through a bracket and fixed on the burner nozzle to enhance the flue gas entrainment effect.

[0023] In summary, the flue gas cooling device for a gas-fired boiler provided in this application has the following advantages: (1) The cooling device uses water in the water-cooled wall 1 as the cooling medium to reduce the temperature of the flue gas entrained in the combustion zone. That is, it utilizes the structure of the boiler itself with the water-cooled wall 1, without the need for additional cooling sources, and has a simple structure that is easy to install and maintain.

[0024] (2) The high-speed jet of the burner will reduce the pressure in the ejector chamber 4, creating a certain pressure difference with the surrounding area, and enhancing the entrainment effect on the surrounding flue gas.

[0025] (3) When the high-temperature flue gas entrained passes through the upper and lower water-cooled tube screens 2 and the left and right water-cooled tube screens 3, some of the heat in the flue gas is absorbed by the water in the water-cooled tube screens. Since the cooling water flows upward, some of the heat in the entrained high-temperature flue gas is carried away. At this time, the flue gas will be reduced by about 20-70°C after passing through the water-cooled tube screens. The reduced temperature of the entrained flue gas will reduce the flame temperature when it re-enters the combustion zone. The reduction in flame temperature will reduce NO. x The generation of [something] achieves the effect of energy conservation and emission reduction.

[0026] (4) The flue gas cooling device for gas boilers can reduce the temperature of the flue gas around the burner, improve the working environment of the burner nozzle, and increase the service life of the burner.

[0027] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A flue gas cooling device for a gas-fired boiler, characterized in that, include: Water-cooled wall, upper and lower water-cooled tube panels and left and right water-cooled tube panels installed on the water-cooled wall, and ejector chamber fixed on the burner nozzle; The ejector chamber is located at the burner outlet end and uses the pressure difference generated by the burner jet to entrain surrounding flue gas. The upper and lower water-cooled tube panels and the left and right water-cooled tube panels are arranged around the flue gas inlet of the ejector chamber and are all connected to the water-cooled wall. The water in the water-cooled wall is used as a cooling medium to cool the entrained flue gas.

2. The flue gas cooling device for a gas-fired boiler according to claim 1, characterized in that: The upper and lower water-cooled tube panels are symmetrically arranged at the upper and lower ends of the burner; each end consists of nine sets of water-cooled panels, and each set of water-cooled panels includes three water-cooled tubes, which are led out from the same wall tube of the water-cooled wall.

3. The flue gas cooling device for a gas-fired boiler according to claim 1, characterized in that: The left and right water-cooled tube panels are symmetrically arranged on the left and right sides of the burner; each end consists of three sets of water-cooled panels, and each set of water-cooled panels includes three water-cooled tubes, which are led out from the same wall tube of the water-cooled wall.

4. The flue gas cooling device for a gas-fired boiler according to claim 1, characterized in that: The ejector chamber is fixed to the burner nozzle by a bracket.

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