A cold air fuel heater

Abstract

The utility model relates to a boiler equipment technical field discloses a cold air fuel oil heater, including heating mixing chamber, air distribution tube, oil gun and ignition gun, heating mixing chamber installs in primary hot -blast female pipe, both ends of heating mixing chamber are open respectively, one end of air distribution tube is closed end, the side portion of closed end of air distribution tube is equipped with combustion -supporting air inlet, the other end of air distribution tube is open end and passes through the pipe wall of primary hot -blast female pipe and stretches into the port of heating mixing chamber, the output of oil gun and the ignition end of ignition gun respectively seal and stretch into the closed end of air distribution tube. The utility model heats the cold air in primary hot -blast pipe through oil gun to satisfy the starting demand of pulverizing system.

Description

Technical Field

[0001] This utility model relates to the field of boiler equipment technology, and in particular to a cold air fuel oil heater. Background Technology

[0002] Cold start-up of boiler units is one of the common start-up types for power plant boiler units. Both newly built units and in-service units require cold start-up after maintenance. However, when starting a cold boiler unit, if the pulverizing system needs to be started, the furnace needs to be preheated until the hot air temperature reaches the pulverizing requirements, which consumes a large amount of fuel oil. To reduce fuel oil consumption, existing systems use cold furnace pulverizing systems. In this system, when the boiler unit is cold-started, a steam heater or oil-assisted heating system is installed on the primary air hot air duct to heat the cold air entering the coal mill to the temperature required for pulverizing. However, if the unit is cold-started and the entire plant has no auxiliary steam system or fuel oil system, the pulverizing system cannot meet the start-up requirements, and the boiler cannot be ignited. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a cold air fuel heater that heats the cold air in the primary hot air pipe by means of an oil gun to meet the start-up requirements of the pulverizing system.

[0004] To solve the above-mentioned technical problems, this utility model provides a cold air fuel heater, including a heating mixing chamber, an air distribution duct, an oil gun, and an ignition gun. The heating mixing chamber is installed inside a primary hot air header, and both ends of the heating mixing chamber are open. One end of the air distribution duct is a closed end, and a combustion air inlet is provided on the side of the closed end of the air distribution duct. The other end of the air distribution duct is an open end and extends through the pipe wall of the primary hot air header into the port of the heating mixing chamber. The output end of the oil gun and the ignition end of the ignition gun are respectively sealed and extended into the closed end of the air distribution duct.

[0005] As a preferred embodiment of the utility model, the closed end of the air distribution duct is provided with an oil gun conduit and an ignition gun conduit. The oil gun conduit and the ignition gun conduit respectively pass through the closed end of the air distribution duct in a sealed manner and extend into the air distribution duct. The oil gun is installed in the oil gun conduit and the ignition gun is installed in the ignition gun conduit.

[0006] As a preferred embodiment of the utility model, the air distribution duct is provided with a flow stabilizer, and one end of the flow stabilizer near the closed end of the air distribution duct is connected to the oil gun guide tube and the end of the ignition gun guide tube that extends into the air distribution duct.

[0007] As a preferred embodiment of the utility model, a visible light flame detector is installed at the closed end of the air distribution duct.

[0008] As a preferred embodiment of the utility model, the heater further includes a first sensor for detecting the temperature of the surface of the heating mixing chamber and a second sensor for detecting the temperature of the pipe wall of the primary hot air header.

[0009] As a preferred embodiment of the utility model, the bottom of the heating mixing chamber is provided with a support seat, which is welded to the end of the heating mixing chamber near the air distribution duct and the inner side of the primary hot air header.

[0010] As a preferred embodiment of the utility model, the oil inlet of the oil gun is connected to the oil inlet pipeline, and the oil inlet pipeline is provided with a first control valve, a first filter and a first pressure gauge.

[0011] As a preferred embodiment of the utility model, the end of the oil inlet pipe away from the oil gun is connected to the output end of the mobile oil pump.

[0012] As a preferred embodiment of the utility model, the oil gun is an air atomizing oil gun, the air inlet of the oil gun is connected to an air pipeline, and the air pipeline is provided with a second control valve, a second filter and a second pressure gauge.

[0013] As a preferred embodiment of the utility model, the combustion air inlet is connected to the combustion air pipeline, and the combustion air pipeline is equipped with a regulating valve and a third pressure gauge.

[0014] This utility model provides a cold air fuel oil heater, which, compared with the prior art, has the following advantages: When the boiler unit is cold-started, the oil gun sprays fuel oil into the air distribution duct, the ignition gun ignites the fuel oil, and the flame is transported to the heating mixing chamber through the air distribution duct. At this time, the primary air fan transports cold air from the outside to the primary hot air header. As the cold air is transported to the coal mill along the primary hot air header, it enters the heating mixing chamber and is heated, so that the cold air is heated to the temperature required for coal mill pulverization, thereby meeting the cold start requirements of the boiler unit and solving the problem that the boiler cannot be ignited when there is no auxiliary steam system or fuel oil system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 yes Figure 1 A magnified view of a portion of point A;

[0017] Figure 3 This is a schematic diagram of the connection structure between the heating mixing chamber and the support base of this utility model;

[0018] In the diagram, the components are: heating mixing chamber 1; first sensor 11; second sensor 12; support base 13; air distribution duct 2; combustion air inlet 21; oil gun conduit 22; ignition gun conduit 23; flow stabilizer 24; oil gun 3; ignition gun 4; primary hot air main pipe 5; visible light flame detector 6; oil inlet pipe 7; first control valve 71; first filter 72; first pressure gauge 73; mobile oil pump 74; air pipe 8; second control valve 81; second filter 82; second pressure gauge 83; combustion air pipe 9; regulating valve 91; and third pressure gauge 92. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figure 1 As shown in Figure 3, a preferred embodiment of the present invention, a cold air fuel oil heater, includes a heating mixing chamber 1, an air distribution duct 2, an oil gun 3, and an ignition gun 4. The heating mixing chamber 1 is installed inside the primary hot air header 5. The heating mixing chamber 1 is made of a stainless steel outer cylinder lined with refractory material to provide space for heating cold air and protect the outer cylinder of the air duct. Both ends of the heating mixing chamber 1 are open. The heating mixing chamber 1 is arranged along the air flow direction of the primary hot air header 5. That is, during the transportation process, the cold air in the primary hot air header 5 will enter the heating mixing chamber 1 from one end and then flow out from the other end. One end of the air distribution duct 2 is a closed end. The side of the closed end of the air distribution duct 2 is provided with a combustion air inlet 21. It can be understood that the combustion air inlet 21 is connected to an air source. The other end of the air distribution duct 2 is an open end and extends through the pipe wall of the primary hot air header 5 into the port of the heating mixing chamber 1. The output end of the oil gun 3 and the ignition end of the ignition gun 4 are respectively sealed into the closed end of the air distribution duct 2.

[0022] The working principle of this embodiment is as follows: When the boiler unit is cold-started, the oil gun 3 sprays fuel oil into the air distribution duct 2, and the ignition gun 4 ignites the fuel oil. The flame is transported to the heating mixing chamber 1 through the air distribution duct 2. At this time, the primary air fan transports the outside cold air to the primary hot air header 5. As the cold air is transported to the coal mill along the primary hot air header 5, it will enter the heating mixing chamber 1 and be heated, so that the cold air is heated to the temperature required for coal mill pulverization, thereby meeting the cold start requirements of the boiler unit. After the boiler start-up requirements are met, the use of this heater is gradually stopped.

[0023] This invention uses an oil gun 3 to heat the cold air in the primary hot air header 5. During the cold start of the boiler unit, it preheats the cold air entering the coal mill, enabling the coal mill to reach the working conditions. This solves the problem that the boiler cannot ignite when there is no auxiliary steam system or fuel oil system. Compared with the existing steam-type air heater, which takes only 15 minutes from the time the steam-type air heater is put into use until the coal mill outlet temperature reaches 75°C, this invention allows for coal mill start-up and pulverization, effectively shortening the warm-up time and increasing the unit start-up speed.

[0024] For example, the closed end of the air distribution duct 2 is provided with an oil gun guide tube 22 and an ignition gun guide tube 23. The oil gun guide tube 22 and the ignition gun guide tube 23 respectively pass through the closed end of the air distribution duct 2 in a sealed manner and extend into the air distribution duct 2. The oil gun 3 is installed in the oil gun guide tube 22 and the ignition gun 4 is installed in the ignition gun guide tube 23, which facilitates the installation of the oil gun 3 and the ignition gun 4. During installation, the oil gun 3 should pass through the oil gun guide tube 22, and then the position of the oil gun 3 should be adjusted so that the nozzle of the oil gun 3 retracts into the front end section of the oil gun guide tube 22 by 50-100mm.

[0025] For example, the air distribution duct 2 is provided with a flow stabilizer 24. One end of the flow stabilizer 24 near the closed end of the air distribution duct 2 is connected to the oil gun guide tube 22 and the end of the ignition gun guide tube 23 that extend into the air distribution duct 2. The flow stabilizer 24 is prior art, and its specific structure will not be described in detail here. It can form a backflow zone of a certain size and position, which plays a role in stabilizing ignition. In addition, it can also promote the early mixing of air and oil, which is beneficial to combustion.

[0026] For example, a visible light flame detector 6 is installed at the closed end of the ventilation duct 2. The visible light flame detector 6 is a flame detection device designed and manufactured based on the principle of detecting visible light of flames. It uses the pulsating visible light radiated when coal, oil and natural gas are burned, and outputs a current signal after photoelectric conversion. The microcomputer then processes the intensity and frequency of the flame to determine whether the flame exists. The visible light flame detector 6 is existing technology, and its specific structure will not be described in detail here.

[0027] For example, the heater also includes a first sensor 11 for detecting the temperature of the surface of the heating mixing chamber 1 and a second sensor 12 for detecting the temperature of the pipe wall of the primary hot air header 5. It is understood that the first sensor 11 and the second sensor 12 are electrically connected to the controller of the heater to detect the temperature of the surface of the heating mixing chamber 1 and the temperature of the pipe wall of the primary hot air header 5. When the temperature exceeds the limit, an alert can be given so that timely adjustment can be made to prevent the air duct from burning out.

[0028] For example, the bottom of the heating mixing chamber 1 is provided with a support 13. The support 13 is welded to the end of the heating mixing chamber 1 near the air distribution duct 2 and the inner side of the primary hot air header 5, respectively, to realize the installation of the heating mixing chamber 1. One end of the heating mixing chamber 1 is a fixed end and the other end is a free end, which can effectively release thermal stress and prevent deformation and damage.

[0029] For example, the oil inlet of the oil gun 3 is connected to the oil inlet pipe 7. The oil inlet pipe 7 is equipped with a first control valve 71, a first filter 72 and a first pressure gauge 73. The amount of fuel delivered to the oil gun 3 can be adjusted by the first control valve 71, thereby adjusting the heating effect.

[0030] For example, the end of the oil inlet pipe 7 away from the oil gun 3 is connected to the output end of the mobile oil pump 74. When in use, the mobile oil pump 74 is moved to the site, and when not in use, the mobile oil pump 74 is moved to a safe area. There is no need to build a fuel tank area on site, reducing equipment investment and ensuring high safety.

[0031] For example, the oil gun 3 is an air atomizing oil gun 3. The air atomizing oil gun 3 is existing technology, and its specific structure will not be described in detail here. Its atomization principle is that when the oil flows out through the oil hole, it is blown out by high-pressure air into tiny particles and enters the mixing chamber to form oil mist. After being fully mixed, it is sprayed out through the nozzle at the front end of the atomizing chamber. The air inlet of the oil gun 3 is connected to the air pipe 8. The air pipe 8 is equipped with a second control valve 81, a second filter 82 and a second pressure gauge 83 to adjust the amount of air delivered to the oil gun 3.

[0032] For example, the combustion air inlet 21 is connected to the combustion air duct 9, and the combustion air duct 9 is equipped with a regulating valve 91 and a third pressure gauge 92 to regulate the amount of air delivered to the combustion air inlet 21.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A cold air fuel oil heater, characterized in that: The device includes a heating and mixing chamber, an air distribution duct, an oil gun, and an ignition gun. The heating and mixing chamber is installed inside a primary hot air header. Both ends of the heating and mixing chamber are open. One end of the air distribution duct is closed, and a combustion air inlet is provided on the side of the closed end of the air distribution duct. The other end of the air distribution duct is open and extends through the wall of the primary hot air header into the port of the heating and mixing chamber. The output end of the oil gun and the ignition end of the ignition gun are respectively sealed and extended into the closed end of the air distribution duct.

2. The cold air fuel oil heater according to claim 1, characterized in that: The closed end of the air distribution duct is provided with an oil gun guide tube and an ignition gun guide tube. The oil gun guide tube and the ignition gun guide tube respectively pass through the closed end of the air distribution duct in a sealed manner and extend into the air distribution duct. The oil gun is installed in the oil gun guide tube and the ignition gun is installed in the ignition gun guide tube.

3. The cold air fuel oil heater according to claim 2, characterized in that: The air distribution duct is equipped with a flow stabilizer, and one end of the flow stabilizer near the closed end of the air distribution duct is connected to the oil gun guide tube and the end of the ignition gun guide tube that extend into the air distribution duct.

4. The cold air fuel oil heater according to claim 1, characterized in that: The closed end of the air distribution duct is equipped with a visible light flame detector.

5. The cold air fuel oil heater according to claim 1, characterized in that: It also includes a first sensor for detecting the temperature of the surface of the heating mixing chamber and a second sensor for detecting the temperature of the pipe wall of the primary hot air header.

6. The cold air fuel oil heater according to claim 1, characterized in that: The bottom of the heating mixing chamber is provided with a support base, which is welded to one end of the heating mixing chamber near the air distribution duct and the inner side of the primary hot air header.

7. The cold air fuel oil heater according to claim 1, characterized in that: The oil inlet of the oil gun is connected to the oil inlet pipeline, which is equipped with a first control valve, a first filter, and a first pressure gauge.

8. The cold air fuel oil heater according to claim 7, characterized in that: The end of the oil inlet pipe furthest from the oil gun is connected to the output end of the mobile oil pump.

9. The cold air fuel oil heater according to claim 1, characterized in that: The oil gun is an air atomizing oil gun, and the air inlet of the oil gun is connected to an air pipeline. The air pipeline is equipped with a second control valve, a second filter, and a second pressure gauge.

10. The cold air fuel oil heater according to claim 1, characterized in that: The combustion air inlet is connected to the combustion air pipeline, and the combustion air pipeline is equipped with a regulating valve and a third pressure gauge.

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