Burner air supply system provided with flue gas waste heat recovery device

Abstract

The utility model relates to the technical field of combustors, in particular to a combustor air supply system with a flue gas waste heat recovery device, which comprises a combustor, a high-pressure fan, the flue gas waste heat recovery device, a chimney and a boiler combustion chamber. The cooling circulating air mechanism introduces high-pressure cooling air to prevent boiler front wall reverse heat from being conducted to the burner body, machine body cooling is achieved, part of boiler front wall reverse heat is recycled, the operation safety of the burner is improved, the high-pressure cooling air is introduced to resist damage of backflow high-temperature flue gas in the boiler to a fire observation channel, an ignition channel and a fire detection channel, and the service life of the burner is prolonged. And meanwhile, the temperature brought by high-temperature combustion-supporting air to heat conduction of all channels is reduced, it is ensured that electrical elements such as a flame detector and an ignition electrode work normally at the working environment temperature meeting the use requirement, faults are reduced, the service life of the electrical elements is prolonged, and the running reliability of the combustor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a burner air supply system equipped with a flue gas waste heat recovery device. Background Art

[0002] After the boiler is equipped with a flue gas waste heat recovery device, it can effectively save production costs, reduce the boiler's exhaust temperature, improve the boiler's thermal efficiency, and make the boiler operation comply with national energy conservation and emission reduction standards.

[0003] However, the combustion-supporting air blown into the system by the fan rises sharply in temperature after being heated by the waste heat recovery device, even reaching 140°C. Although the hot combustion-supporting air makes the combustion more complete, the high-temperature combustion-supporting air poses a severe test to the safe operation of the burner.

[0004] The burners of boiler systems equipped with flue gas waste heat recovery devices are subject to the damage of high-temperature combustion-supporting air and heat reflection from the boiler front wall. They will inevitably encounter problems such as high temperature of the accessible parts of the burner surface, condensation water in the body channel, erosion by reflux high-temperature smoke, and frequent electrical component failures, which seriously affect the safety of burner operation and equipment reliability. Utility Model Content

[0005] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose a burner air supply system equipped with a flue gas waste heat recovery device.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A burner air supply system equipped with a flue gas waste heat recovery device is designed, comprising a burner, a high-pressure blower, a flue gas waste heat recovery device, a chimney, and a boiler combustion chamber. The burner body is integrated with a cooling circulating air mechanism. The burner is installed at the front end of the boiler combustion chamber, and the cooling circulating air mechanism is connected to the boiler front wall.

[0008] The cooling circulating air mechanism is provided with a high-pressure inlet and a low-pressure outlet. The high-pressure fan outlet is connected to the high-pressure inlet through a high-pressure pipeline. The high-pressure pipeline is connected to branch pipelines leading to the ignition channel, fire detection channel, and fire observation channel respectively.

[0009] A shut-off valve is connected in series on each branch pipeline; the low-pressure outlet is connected to the high-pressure blower inlet through a low-pressure pipeline, and a shut-off valve is connected in series on the low-pressure pipeline.

[0010] In detail, the boiler smoke box at the rear of the boiler combustion chamber is connected to the chimney, and the terminal outlet of the chimney is connected in series with an electric air duct baffle.

[0011] In detail, the heat medium inlet of the flue gas waste heat recovery device is connected to the chimney channel through a hot air duct, and an electric duct baffle is connected in series to the hot air duct.

[0012] In detail, the refrigerant inlet of the flue gas waste heat recovery device is connected to a high-pressure fan, the high-pressure fan is equipped with a powerful fan with an adjustable air supply pressure of 0.76-1.2MPa, and a fresh air filter device is set at the inlet of the high-pressure fan.

[0013] In detail, an induced draft fan is arranged on the flue gas exhaust channel of the waste heat recovery device.

[0014] In detail, the combustion air outlet of the waste heat recovery device is connected to the air inlet of the burner through an air supply duct.

[0015] In detail, a first pressure sensing device and a second pressure sensing device are installed at the air inlet interface of the burner, and a third pressure sensing device is installed at the outlet of the high-pressure blower.

[0016] The design scheme proposed by the utility model has the following beneficial effects during application:

[0017] 1. The burner body integrates a cooling circulating air mechanism and introduces high-pressure cooling air to block the heat reflected from the boiler front wall from being transferred to the burner body, thereby cooling the body and recovering part of the heat reflected from the boiler front wall, thereby improving the safety of burner operation.

[0018] 2. Introduce high-pressure cooling air to counteract the damage caused by the high-temperature flue gas flowing back into the furnace to the fire viewing channel, ignition channel, and fire detection channel. At the same time, reduce the temperature caused by the heat conducted by the high-temperature combustion-supporting air to each channel, ensure that electrical components such as flame detectors and ignition electrodes work normally at an operating environment temperature that meets the use requirements, reduce failures and extend their service life, and improve the reliability of burner operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a process flow diagram of the utility model;

[0020] Figure 2 It is a structural diagram of the present utility model.

[0021] In the figure: 110, burner; 120, high-pressure fan; 130, waste heat recovery device; 140, chimney; 150, boiler combustion chamber; 1110, cooling circulation air mechanism; 1112, high-pressure inlet; 1113, low-pressure outlet; 112, ignition channel; 113, fire detection channel; 114, fire observation channel; 115, high-pressure pipeline; 116, low-pressure pipeline; 117, first pressure sensing device; 118, second pressure sensing device; 121, fresh air filtering device; 122, third pressure sensing device; 131, induced draft fan; 132, air supply duct; 133, hot air duct; 151, boiler smoke box; 16, electric air duct baffle; 17, shut-off valve. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Reference Figure 1-2 , a burner air supply system equipped with a flue gas waste heat recovery device, comprising a burner 110, a high-pressure blower 120, a waste heat recovery device 130, a chimney 140, and a boiler combustion chamber 150;

[0024] The burner 110 body is integrated with a cooling circulation air mechanism 1110. The burner 110 is installed at the front end of the boiler combustion chamber 150. After installation, the cooling circulation air mechanism 1110 is connected to the front wall of the boiler.

[0025] A high-pressure inlet 1112 and a low-pressure outlet 1113 are provided on the cooling circulating air mechanism 1110. The outlet of the high-pressure fan 120 is connected to the high-pressure inlet 1112 through a high-pressure pipeline 115. The high-pressure pipeline 115 is connected to branch lines leading to the ignition channel 112, the fire detection channel 113, and the fire observation channel 114 respectively. A shut-off valve 17 is connected in series to each branch line; the low-pressure outlet 1113 is connected to the inlet of the high-pressure fan 120 through a low-pressure pipeline 116, and a shut-off valve 17 is connected in series to the low-pressure pipeline 116.

[0026] It should be further explained that the boiler smoke box 151 at the rear of the boiler combustion chamber 150 is connected to the chimney 140 , and the terminal outlet of the chimney 140 is connected in series with an electric air duct baffle 16 .

[0027] It should be further explained that the heat medium inlet of the flue gas waste heat recovery device 130 is connected to the chimney 140 through the hot air duct 133, and the hot air duct 133 is connected in series with an electric duct baffle 16;

[0028] It should be further explained that the refrigerant inlet of the flue gas waste heat recovery device 130 is connected to the high-pressure fan 120, which is equipped with a powerful fan with an adjustable air supply pressure of 0.76-1.2 MPa. A fresh air filter device 121 is provided at the inlet of the high-pressure fan 120;

[0029] It should be further explained that an induced draft fan 131 is arranged on the flue gas discharge passage of the waste heat recovery device 130;

[0030] It should be further explained that the combustion air outlet of the waste heat recovery device 130 is connected to the air inlet of the burner 110 through an air supply duct 132.

[0031] It should be further explained that a first pressure sensing device 117 and a second pressure sensing device 118 are installed at the air inlet interface of the burner 110, and a third pressure sensing device 122 is installed at the outlet of the high-pressure fan 120. These sensing devices can detect and collect the combustion air temperature and pressure values in real time.

[0032] Working method:

[0033] Under normal circumstances, the electric duct damper 16 connected in series to the hot air duct 133 is in a fully open state, and the electric duct damper 16 connected in series to the chimney 140 is in a fully closed state. At this time, the waste heat recovery device 130 is in full operation, the system combustion hot air temperature is the highest, and the combustion air pressure is the lowest;

[0034] The high-temperature flue gas from the boiler is heated by the flue gas waste heat recovery device 130, and the cold air blown in by the high-pressure fan is heated into hot air, and then sent to the burner 110 through the air supply duct 132. The temperature of the heated air can even reach 140°C. The burner 110 absorbs hot combustion-supporting air to make the combustion more complete, reduce incomplete combustion losses, and thus increase thermal efficiency.

[0035] Furthermore, in order to meet the actual working conditions for the combustion-supporting air pressure and combustion-supporting air temperature requirements, the combustion-supporting air temperature and pressure can be adjusted by synchronously adjusting the opening of the electric duct baffle 16 connected in series at the end of the hot air duct 133 and the chimney 140 according to the feedback values of the combustion-supporting air pressure and combustion-supporting air temperature. At this time, the waste heat recovery device is in a semi-operational state.

[0036] Furthermore, when the electric duct baffle 16 on the hot air duct 133 is in a fully closed state, the electric duct baffle 16 at the end of the chimney 140 is in a fully open state. At this time, the flue gas waste heat recovery device 130 is not in operation, the combustion-supporting air is the ambient fresh air with high oxygen content, and the system combustion-supporting air pressure is the largest. The ambient fresh air passes through the fresh air filter device 121 and is blown into the waste heat recovery device 130 through the high-pressure fan 120 without being heated and enters the air supply duct 132, providing normal temperature combustion-supporting air for the burner.

[0037] Specifically, no matter what state the flue gas waste heat recovery device 130 is in, the high-pressure blower 120 continuously provides high-pressure cooling air to the cooling circulating air mechanism 1110 through the high-pressure pipeline 115 .

[0038] In order to ensure minimum wind loss in the system, the layout of the air supply duct 132, high-pressure pipeline 115, and low-pressure pipeline 116 should be as smooth as possible, and structures such as elbows and reductions that are not conducive to air flow should be minimized.

[0039] A part of the cooling air enters from the high-pressure inlet 1112 through the high-pressure pipeline 115, and then travels along the cavity of the cooling circulation air mechanism 1110 to take away the conduction heat from the front wall of the boiler and the high-temperature combustion-supporting air, and is drawn out from the low-pressure outlet 1113. It is connected to the inlet of the high-pressure blower 120 through the low-pressure pipeline 116, and the shut-off valve 17 is connected in series on the low-pressure pipeline 116; a part of the cooling air is respectively led to the ignition channel 112, the fire detection channel 113, and the fire observation channel 114 through the branch line connected to the high-pressure pipeline 115 to resist the damage caused by the hot flue gas from the combustion chamber, block the heat conduction of each channel, and at the same time reduce the temperature caused by the heat conducted to each channel by the high-temperature combustion-supporting air, so as to ensure that electrical components such as flame detectors and ignition electrodes work normally at an operating environment temperature that meets the use requirements, reduce failures and extend their service life, so that the burner can operate safely and reliably.

[0040] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A burner air supply system equipped with a flue gas waste heat recovery device, comprising a burner (110), a high-pressure blower (120), a flue gas waste heat recovery device (130), a chimney (140), and a boiler combustion chamber (150), characterized in that: The high-pressure blower (120) outlet is connected to the high-pressure inlet (1112) via a high-pressure pipeline (115), and the low-pressure outlet (1113) is connected to the high-pressure blower (120) inlet via a low-pressure pipeline (116).

2. The burner air supply system equipped with a flue gas waste heat recovery device according to claim 1, characterized in that: A first pressure sensor device (117) and a second pressure sensor device (118) are installed at the air inlet interface of the burner (110), and a pressure sensor device (122) is installed on the high-pressure blower (120).

3. The burner air supply system equipped with a flue gas waste heat recovery device according to claim 2, characterized in that: The chimney (140) is connected in series with an electric air duct baffle (16), and the hot air duct (133) is connected in series with an electric air duct baffle (16).

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