Cold air fuel oil heating device

Abstract

The utility model discloses a cold air fuel oil heating device which is arranged in an air duct between a primary air fan and a coal mill and comprises an oil burner, an oil gun, a fuel oil system, a compressed air system, a cooling combustion-supporting air system and a control cabinet. The compressed air system is connected to the compressed air mother pipe so as to provide compressed air for oil gun atomization, the cooling combustion-supporting air system is connected to the sealing air mother pipe so as to provide cold air for oil gun cooling and combustion supporting, and the cold air fuel heating device is controlled by a remote DCS. The device is small in size, simple in structure and convenient to operate, primary air circulation resistance is smaller and almost free of resistance when the device is arranged in an air duct, primary air smoothness is better guaranteed, accordingly, power consumption of a primary fan is not increased, the cold air heating speed is high, the device can be put into a coal mill within a short time, and the cost is reduced. The problems that a boiler is started slowly and energy is wasted are solved, the energy-saving effect is better guaranteed, and high practicability is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler ignition accessories, and more specifically to a cold air fuel heating device. Background Art

[0002] The boiler ignition system of a power plant is an important system for unit startup. When the boiler is ignited and started, the primary air is cold air, and the coal mill must be started with hot primary air above 160°C to dry the pulverized coal medium. At present, in China, most of the cold primary air heating adopts the technology of heating the primary air with a steam heat exchanger. However, the steam heat exchanger has dense tube bundles, large resistance of the primary air and slow heating speed, which will increase the power consumption of the primary air fan, cause energy waste, and the steam heat exchanger uses steam at about 250°C in the auxiliary steam system of the power plant as the heat exchange heat source medium, with a low temperature of the heat medium and slow temperature rise. Since various current technologies have defects to varying degrees and there is an energy waste problem when starting the coal mill after heating the cold primary air, it is urgent to provide a cold air fuel heating device to overcome the above defects. Content of the Utility Model

[0003] In view of this, the utility model provides a cold air fuel heating device, which has a simple structure and is convenient to operate. It can effectively overcome the defects of the existing technology, ensure the smooth flow of the primary air, and has a fast heating speed, solving the problems of slow boiler startup and energy waste, being able to better save energy and being more practical.

[0004] To achieve the above object, the cold air fuel heating device provided by the utility model is arranged in the air duct between the primary air fan and the coal mill, and is characterized in that it includes an oil burner and an oil gun with one end pipe-connected to the oil burner. One end of the oil burner is pipe-connected to one end of a flame detector sleeve. The other end of the oil gun is pipe-connected to a fuel system, a compressed air system and a cooling combustion-supporting air system, and the fuel system, the compressed air system and the cooling combustion-supporting air system are all electrically connected to a control cabinet.

[0005] Preferably, the oil gun includes a main oil gun and an auxiliary oil gun. The main oil gun adopts secondary atomization, and the auxiliary oil gun is used to increase the fuel supply amount for the main oil gun.

[0006] Preferably, the side wall of the oil burner is provided with a main oil gun connection flange, an auxiliary oil gun installation hole and a flame detector sleeve installation hole. One ends of the main oil gun and the auxiliary oil gun are respectively pipe-connected to the oil burner through the main oil gun connection flange and the auxiliary oil gun installation hole, and one end of the flame detector sleeve is pipe-connected to the oil burner through the flame detector sleeve installation hole.

[0007] Preferably, the fuel system is connected to the fuel main pipe on the boiler fuel platform through a seamless steel pipe and to the oil gun through a metal hose for supplying fuel to the oil gun.

[0008] Preferably, a manual valve, a quick cut-off valve, a filter and a pressure gauge are provided on the connecting pipeline between the fuel system and the oil gun.

[0009] Preferably, the compressed air system is connected to the compressed air main pipe for instrument use through a seamless steel pipe and to the oil gun through a metal hose, and is used to provide the air required for atomization of the oil gun.

[0010] Preferably, a manual valve, a quick cut-off valve, a filter and a pressure gauge are provided on the connecting pipeline between the compressed air system and the oil gun.

[0011] Preferably, the cooling and combustion-supporting air system is connected to the seal air main pipe through a steel pipe and to the oil gun through a metal hose, and is used to provide the combustion-supporting air volume for the oil gun and the cold air source required for flame detection cooling.

[0012] Preferably, a manual valve and a pressure gauge are provided on the connecting pipeline between the cooling and combustion-supporting air system and the oil gun.

[0013] Preferably, a refractory layer with a length greater than 5 meters is provided on the four walls of the air duct at the outlet of the oil burner to prevent the air duct from overheating and deforming.

[0014] Through the above technical solutions, compared with the prior art, the cold air fuel heating device provided by the present utility model is small in size, simple in structure and convenient to operate. Being arranged in the air duct can make the resistance of the primary air flow smaller, almost without resistance, better ensuring the unobstructed flow of the primary air. Thus, the power consumption of the primary air fan is not increased, and the cold air heating speed is fast, and it can be put into the coal mill in a very short time, solving the problems of slow boiler startup and energy waste, better ensuring the energy-saving effect, and having strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0016] Figure 1 It is a schematic side view of the installation of the cold air fuel heating device of the present utility model.

[0017] Figure 2 For the Figure 1 schematic left cross-sectional view of the cold air fuel heating device in the present utility model.

[0018] Figure 3 It is a schematic connection diagram of each component, system and control cabinet of the cold air fuel heating device of the present utility model.

[0019] In the figure, 1 is an oil burner; 12 is the main oil gun connection flange; 13 is the auxiliary oil gun mounting hole; 14 is the flame detector sleeve mounting hole; 2 is the main oil gun; 3 is the auxiliary oil gun; 4 is the flame detector sleeve; 5 is the refractory layer; 6 is the fuel system; 7 is the compressed air system; 8 is the cooling combustion-supporting air system; 9 is the control cabinet. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to the attached Figures 1-3 , which is a cold air fuel heating device disclosed by the present invention.

[0022] The cold air fuel heating device provided by the present invention includes: an oil burner 1, a main oil gun 2, an auxiliary oil gun 3, a flame detector sleeve 4, a fuel system 6, a compressed air system 7, a cooling combustion-supporting air system 8, and a control cabinet 9.

[0023] The cold air fuel heating device is arranged in the air duct between the primary air fan and the coal mill and is installed through a support plate. The fillet weld leg height between the support plate and the air duct wall is not less than 10 mm. The oil burner 1 of the cold air fuel heating device is installed at the axial center of the primary air duct and is used to gather the attached oil flame in the internal space of the oil burner 1, so that the attached oil flame is ejected regularly to uniformly heat the surrounding cold air. A main oil gun connection flange 12, an auxiliary oil gun mounting hole 13, and a flame detector sleeve mounting hole 14 are provided on the side wall of the oil burner 1.

[0024] It should be noted that the main oil gun 2 and the auxiliary oil gun 3 of the cold air fuel heating device are respectively installed on the main oil gun connection flange 12 and the auxiliary oil gun mounting hole 13 of the oil burner 1, and the inlet end of the oil gun is left outside the air duct for oil gun maintenance. One end of the flame detector sleeve 4 is installed in the flame detector sleeve mounting hole 14 of the oil burner 1, and the other end is left outside the air duct for flame detector maintenance.

[0025] It should be noted that the main oil gun 2 adopts secondary atomization. One is mechanical atomization, and the other is to tear and crush the mechanically atomized oil droplets through compressed air to form ultra-fine oil droplets. After ignition, the flame temperature is 1200 °C, which directly heats the cold air, and the heating speed is very fast; the auxiliary oil gun 3 is used to increase the calorific value treatment and improve the heat required for the hot air, and whether to put it into operation can be determined according to the cold air heating demand; the flame detector sleeve 4 is used to detect whether there is fire in the oil gun, and the judgment signal directly enters the DCS system for logic protection.

[0026] It should be noted that DCS is the English abbreviation of Distributed Control System, and in the domestic automatic control industry in China, it is also called the distributed control system. The so-called distributed control system, or in some materials called the distributed control system, is a new type of computer control system relative to the centralized control system. It is developed and evolved on the basis of the centralized control system. It is a multi-level computer system composed of a process control level and a process monitoring level linked by a communication network. Based on microprocessors, it features decentralized control of hazards, centralized operation and management, integrating advanced computer technology, communication technology, CRT technology and control technology (i.e., 4C technology). Its basic idea is decentralized control, centralized operation, hierarchical management, flexible configuration and convenient configuration. With the rapid development of modern computer and communication network technology, DCS is developing towards diversification, networking, openness and integrated management, enabling different models of DCS to be interconnected for data exchange, and connecting the DCS system to the factory management network through Ethernet to realize real-time data access to the Internet.

[0027] It should be noted that a refractory layer 5 is provided in the air duct where the cold air fuel heating device is installed. First, a wire mesh with a length greater than 5 meters is installed on the four walls of the air duct at the outlet of the oil burner 1, and a 30-mm-thick refractory layer is made of refractory plastic to prevent the air duct from overheating and deforming.

[0028] The fuel supply system 6 is installed near the cold air fuel heating device outside the air duct and is mainly composed of a fuel pump, a fuel filter, an oil injector, etc. to ensure the fuel supply of the oil gun. The compressed air system 7 is installed near the cold air fuel heating device outside the air duct and is mainly composed of an air compressor, an air storage tank, a dryer, a filter, an air delivery pipeline, valves, etc. to ensure the atomization of the oil gun. The cooling and combustion-supporting air system 8 is installed near the cold air fuel heating device outside the air duct and is mainly composed of a housing, a fan motor, a fan impeller, a wind gun fire tube, a damper controller, a damper, a diffusion plate, etc. to ensure the cooling of the fire detection sleeve 4 and the combustion support of the oil gun. All the electrical control equipment of the systems enters the control cabinet 9, and the control cabinet 9 is hard-wired to the DCS system to ensure that the control cabinet 9 meets the remote or on-site control operations of the entire system, thus providing a complete overall coating function, being able to quickly and effectively convey the pulverized coal drying medium to the coal mill and achieving the energy-saving effect.

[0029] It should be noted that the fuel system 6 is taken out from the boiler fuel platform by seamless steel pipes, led to the vicinity of the cold air heating device, and after installing a manual valve, a quick cut-off valve, a filter, and a pressure gauge, it is connected to the main and auxiliary oil guns with metal hoses for supplying oil to the oil guns; the compressed air system 7 is taken out from the compressed air main pipe used by the instrument (the instrument is a compressed air instrument) by seamless steel pipes, led to the vicinity of the cold air heating device, and after installing a manual valve, a quick cut-off valve, a filter, and a pressure gauge, it is connected to the main and auxiliary oil guns with metal hoses for providing the air required for atomizing the oil guns; the cooling combustion-supporting air system 8 is taken out from the seal air main pipe by steel pipes, led to the vicinity of the cold air heating device, and after installing a manual valve and a pressure gauge, it is connected to the main and auxiliary oil guns with metal hoses for providing the combustion-supporting air volume for the oil guns and the cold air source required for fire detection cooling.

[0030] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cold air fuel heating device, arranged in the air duct between the primary air fan and the coal mill, characterized in that: The invention comprises an oil burner (1) and an oil gun having one end connected to the oil burner (1) by a pipe, wherein the oil burner (1) is connected to one end of a fire detection sleeve (4) by a pipe, and the other end of the oil gun is connected to a fuel system (6), a compressed air system (7) and a cooling combustion-supporting air system (8), and the fuel system (6), the compressed air system (7) and the cooling combustion-supporting air system (8) are all electrically connected to a control cabinet (9).

2. The cold air fuel heating device according to claim 1, characterized in that: The oil gun comprises a main oil gun (2) and an auxiliary oil gun (3). The main oil gun (2) adopts two-stage atomization, and the auxiliary oil gun (3) increases the oil supply and the heat required by the hot air.

3. The cold air fuel heating device according to claim 2, characterized in that: The side wall of the oil burner (1) is provided with a main oil gun connecting flange (12), an auxiliary oil gun mounting hole (13), and a fire detection sleeve mounting hole (14); one end of the main oil gun (2) and the auxiliary oil gun (3) are respectively connected to the oil burner (1) through the main oil gun connecting flange (12) and the auxiliary oil gun mounting hole (13); one end of the fire detection sleeve (4) is connected to the oil burner (1) through the fire detection sleeve mounting hole (14).

4. The cold air fuel heating device according to claim 1, characterized in that: The fuel system (6) is connected to the fuel main pipe of the boiler fuel platform through a seamless steel pipe, and is connected to the oil gun through a metal hose, so as to supply oil to the oil gun.

5. The cold air fuel heating device according to claim 4, characterized in that: A manual valve, a quick-break valve, a filter and a pressure gauge are provided on the connecting pipeline between the fuel system (6) and the fuel gun.

6. The cold air fuel heating device according to claim 1, characterized in that: The compressed air system (7) is connected to the compressed air main pipe used by the instrument through a seamless steel pipe, and is connected to the oil gun through a metal hose, so as to provide the air required for the atomization of the oil gun.

7. The cold air fuel heating device according to claim 6, characterized in that: A manual valve, a quick-break valve, a filter and a pressure gauge are provided on the connecting pipeline between the compressed air system (7) and the oil gun.

8. The cold air fuel heating device according to claim 1, characterized in that: The cooling combustion-supporting air system (8) is connected to the sealed air main pipe via a steel pipe, and is connected to the oil gun via a metal hose, and is used to provide the oil gun with a combustion-supporting air volume and a cold air source required for fire detection cooling.

9. The cold air fuel heating device according to claim 8, characterized in that: A manual valve and a pressure gauge are provided on the connecting pipeline between the cooling combustion-supporting air system (8) and the oil gun.

10. The cold air fuel heating device according to claim 1, characterized in that: A fire-resistant layer (5) with a length greater than 5 meters is provided on the four walls of the air duct at the outlet of the oil burner (1) to prevent the air duct from being deformed due to overheating.

Images