CN216079790U

CN216079790U - Direct-fired natural gas hot air supply system

Info

Publication number: CN216079790U
Application number: CN202122283590.1U
Authority: CN
Inventors: 闫振和; 吴荣业
Original assignee: Wenlue Hongyi Energy Technology Shanghai Co ltd
Current assignee: Wenlue Hongyi Energy Technology Shanghai Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-03-18
Anticipated expiration: 2031-09-18

Abstract

The utility model discloses a direct-fired natural gas hot air supply system which is sequentially provided with a burner, an air storage chamber, a combustion chamber, a nozzle, an auxiliary cavity inner cover, a gas transmission pipeline, a tail gas recovery pipe, an induced draft fan and a heat source exchanger according to the flowing process of gas, wherein the gas pipeline is connected below the burner, one end of the air storage chamber is communicated with the burner, the other end of the air storage chamber is connected with the combustion chamber, the nozzle is divided into six groups, the right ends of the six groups of nozzles are connected with the air storage chamber, the left ends of the six groups of nozzles are positioned in the combustion chamber, the auxiliary cavity inner cover is arranged on the inner wall of the combustion chamber, the surface of the auxiliary cavity inner cover is provided with a plurality of groups of return air guide pipes, a detection mechanism is also arranged inside the combustion chamber, and the upper end of the auxiliary cavity inner cover is connected with the gas transmission pipeline. The utility model solves the problems of high content of nitrogen oxides caused by local high-temperature overheating in the natural gas heat supply process, damage to a hearth of a combustion chamber caused by high temperature and the like. The combustion process is automatically controlled through data, energy is saved, emission of harmful gases such as river nitrogen oxides and the like is realized, and the environment is protected.

Description

Direct-fired natural gas hot air supply system

Technical Field

The utility model relates to the technical field of gas direct-fired heat supply, in particular to a direct-fired natural gas hot air supply system.

Background

Heat sources are needed in industrial production and large-scale public places, and the use of coal is limited due to the gradual improvement of environmental protection requirements. The use of natural gas as a heat source is the recent preferred environmentally friendly energy source. Harmful gases are generated in the combustion process of coal, fuel oil and natural gas, wherein the content of the harmful gases in tail gas is the lowest after the natural gas is combusted. The content of nitrogen oxides is an important index for controlling the emission of tail gas. Because of the difference of combustion technology and conditions, the content of generated nitrogen oxides is very different, the content of nitrogen oxides in the existing natural gas combustion technology is more than 50ppm, and the content of nitrogen oxides in a few technologies can reach 30ppm, the prior art is as follows: the natural gas is mixed with air through a burner with a blower, the mixed gas is sent to a combustion chamber through a spray gun (single spray channel) of the burner, ignition and combustion are carried out in the combustion chamber, and a high-temperature area can be generated in the combustion process to continuously combust the mixed gas. And the high-temperature gas after combustion is conveyed to a heat source exchanger or an interval needing a heat source by a draught fan for use. After the high-temperature gas releases heat in the heat source exchanger, tail gas is discharged into the atmosphere by the induced draft fan, and partial tail gas is recycled by the tail gas recycling pipe and is used for protecting the auxiliary cavity inner cover and reducing the oxygen concentration in the mixed gas.

However, the existing natural gas has the following problems in the combustion process: (1) the mixed gas obtained by mixing natural gas and air has high air content and poor controllability, so that a large amount of oxygen is excessive after combustion; (2) the mixed gas forms a large flame in the combustion chamber, the heat of the combustion area is concentrated, the local temperature is high, the overheating area is large, the chemical activity of nitrogen molecules in the air is increased, the nitrogen molecules are easy to oxidize, and oxynitride is generated; (3) the concentration of the mixed gas is not detected, the mixed gas is adjusted only by depending on the color and the shape of flame, the error is large, the controllability is poor, and when the gas supply condition and the power supply condition fluctuate, the combustion condition has no contravariant. For this reason, a corresponding technical scheme needs to be designed to solve the existing technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a direct-combustion natural gas hot air supply system, which solves the problems of high content of nitrogen oxides caused by local high-temperature overheating in the natural gas heat supply process, damage of high temperature to a hearth of a combustion chamber and the like. The combustion process is automatically controlled through data, energy is saved, emission of harmful gases such as river nitrogen oxides and the like is realized, and the environment is protected.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a direct combustion formula natural gas hot air supply system, has set gradually combustor, reservoir, combustion chamber, nozzle, assists chamber inner cover, gas transmission pipeline, tail gas recovery pipe, draught fan and heat source interchanger according to the process of flowing through of gas, the below of combustor is connected with the gas pipeline, the one end of reservoir is linked together and the other end is connected with the combustion chamber with the combustor, the nozzle branch is equipped with six groups, six groups the right-hand member of nozzle is connected with the reservoir and the left end is located the combustion chamber, assist the chamber inner cover and install on the inner wall of combustion chamber and surface mounting has a plurality of groups return air stand pipes, the inside of combustion chamber still is provided with detection mechanism and upper end and is connected with the gas transmission pipeline, the end of gas transmission pipeline is connected with the tail gas recovery pipe, the lower extreme of tail gas recovery pipe is connected with the draught fan, the exhaust end of draught fan is connected with the heat source interchanger through the gas transmission pipeline, the heat source exchanger is connected with the combustion chamber through a gas transmission pipeline.

In a preferred embodiment of the present invention, the detection mechanism includes a temperature sensor, a pressure sensor, and an oxygen concentration sensor, which are built in the combustion chamber, the temperature sensor is connected to a temperature controller through a line, the temperature controller is connected to a gas control valve through a line, the gas control valve is mounted on a gas pipeline, the pressure sensor is connected to a programmable controller through a line, the programmable controller is connected to a frequency converter through a line, the frequency converter controls the induced draft fan, the oxygen concentration sensor is connected to the programmable controller, and the programmable controller is connected to a heat insulation return air valve and a mixed air valve through a line.

In a preferred embodiment of the present invention, the six groups of nozzles have different lengths and are arranged in a spiral shape, and ends of the six groups of nozzles are located inside the auxiliary inner chamber cover.

In a preferred embodiment of the present invention, a flow guide channel is formed between the auxiliary inner chamber cover and the inner wall of the combustion chamber, and a plurality of sets of the return air guide pipes are obliquely installed on the auxiliary inner chamber cover.

As a preferred embodiment of the utility model, the specifications of the two ends of the combustion chamber are smaller than the specification of the middle part, and the upper left corner of the combustion chamber is provided with an explosion-proof opening.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model optimizes the structure of the existing natural gas combustion equipment, the gas mixing chamber of the burner is made into an independent cavity, namely a gas storage chamber, the mixed gas is mixed in the gas storage chamber for increasing the mixing time and effect, and keeps a certain pressure, the gas storage chamber is connected to a plurality of nozzles which are different in length and spirally distributed, the number of the nozzles is more than 6, the mixed gas is combusted in a plurality of areas through the nozzles, the flame temperature is reduced, the high temperature and repeated heating are avoided, the nozzles are spirally arranged, the combusted gas is spirally diffused and can be fully mixed, the combustion temperature is reduced, an auxiliary cavity inner cover is arranged in the combustion chamber, an air return guide pipe is arranged in the auxiliary cavity inner cover, the air return passes through the guide pipe, a circular flow is formed on the inner surface of the auxiliary cavity inner cover, and the combusted high-temperature gas is prevented from contacting the combustion chamber and the auxiliary cavity inner cover, the service life is prolonged, and the working condition temperature is reduced.

2. The combustion equipment is internally provided with the temperature sensor, the pressure sensor and the oxygen concentration sensor and is provided with the corresponding control device, and the control devices can be used for controlling the opening and closing of a plurality of groups of valves respectively, so that the automation and intelligence degree of the device are improved, and the combustion effect of the combustion equipment is improved.

3. Compared with the prior art, the scheme is used for gas heating systems with different powers, and the content of Chinese nitrogen oxides in tail gas can be reduced by 50-80%. The lowest index of the nitrogen oxide can reach 12ppm, the content of the nitrogen oxide in the tail gas in the prior art is 50-80ppm, the temperature of the inner wall of the combustion chamber in the prior art is 900-.

Drawings

FIG. 1 is an overall block diagram of the present invention;

in the figure, 1, a burner; 2. an air storage chamber; 3. a combustion chamber; 4. a nozzle; 5. an auxiliary inner cavity cover; 6. a gas pipeline; 7. a tail gas recovery pipe; 8. an induced draft fan; 9. a heat source exchanger; 10. an air return guide pipe; 11. a temperature sensor; 12. a pressure sensor; 13. an oxygen concentration sensor; 14. a temperature controller; 15. a gas control valve; 16. a programmable controller; 17. a frequency converter; 18. a heat-insulating return air valve; 19. a mixing air valve; 20. a flow guide cavity channel; 21. an explosion-proof port; 22. a gas pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a direct-fired natural gas hot air supply system is sequentially provided with a combustor 1, an air storage chamber 2, a combustion chamber 3, nozzles 4, an auxiliary cavity inner cover 5, a gas transmission pipeline 6, a tail gas recovery pipe 7, an induced draft fan 8 and a heat source exchanger 9 according to the flowing process of gas, wherein a gas pipeline 22 is connected below the combustor 1, one end of the air storage chamber 2 is communicated with the combustor 1, the other end of the air storage chamber is connected with the combustion chamber 3, the nozzles 4 are divided into six groups, the right ends of the six groups of nozzles 4 are connected with the air storage chamber 2, the left end of each group of nozzles is positioned in the combustion chamber 3, the auxiliary cavity inner cover 5 is arranged on the inner wall of the combustion chamber 3, the surface of each auxiliary cavity inner cover is provided with a plurality of groups of return air guide pipes 10, a detection mechanism is further arranged inside the combustion chamber 3, the upper end of each combustion chamber is connected with the gas transmission pipeline 6, the tail gas transmission pipeline 6 is connected with the tail gas recovery pipe 7, the lower end of the tail gas recovery pipe 7 is connected with the induced draft fan 8, the exhaust end of the induced draft fan 8 is connected with the heat source exchanger 9 through the gas transmission pipeline 6, the heat source exchanger 9 is connected to the combustion chamber 3 via a gas line 6.

Further improved, as shown in fig. 1: the detection mechanism comprises a temperature sensor 11 arranged in the combustion chamber 3, a pressure sensor 12 and an oxygen concentration sensor 13, wherein the temperature sensor 11 is connected with a temperature controller 14 through a line, the temperature controller 14 is connected with a gas control valve 15 through a line, the gas control valve 15 is installed on a gas pipeline 22, the pressure sensor 12 is connected with a programmable controller 16 through a line, the programmable controller 16 is connected with a frequency converter 17 through a line, the frequency converter 17 controls the induced draft fan 8, the oxygen concentration sensor 13 is connected with the programmable controller 16, the programmable controller 16 is connected with a heat insulation air return valve 18 through a line, and a mixed air valve 19 is arranged, so that the temperature, the pressure and the oxygen concentration in the combustion chamber 3 can be detected and processed, and the normal operation of the device is ensured.

Further improved, as shown in fig. 1: the six groups of nozzles 4 are different in length and are arranged spirally, and the end parts of the six groups of nozzles 4 are positioned in the auxiliary cavity inner cover 5, so that combusted gas is diffused spirally and can be fully mixed, and the combustion temperature is reduced.

Further improved, as shown in fig. 1: a flow guide cavity channel 20 is formed between the auxiliary cavity inner cover 5 and the inner wall of the combustion chamber 3, and a plurality of groups of return air guide pipes 10 are obliquely arranged on the auxiliary cavity inner cover 5.

Specifically, the specifications of the two ends of the combustion chamber 3 are smaller than the specification of the middle part, and the upper left corner of the combustion chamber is provided with an explosion-proof opening 21.

When in use: the utility model makes the gas mixing chamber of the burner into an independent cavity, namely a gas storage chamber 2, the mixed gas increases the mixing time and effect in the gas storage chamber 2 and keeps a certain pressure, the gas storage chamber 2 is connected with a plurality of nozzles 4 which are different in length and distributed spirally, the number of the nozzles 4 is more than 6, the mixed gas is burnt in a plurality of areas through the nozzles 4, the flame temperature is reduced, the high temperature and repeated heating are avoided, the nozzles 4 are spirally arranged, the burnt gas is spirally diffused and can be fully mixed, the burning temperature is reduced, an auxiliary cavity inner cover 5 is arranged in the burning chamber 3, the auxiliary cavity inner cover 5 is provided with a return air guide pipe 10, the return air passes through the guide pipe, the circulation flow is formed on the inner surface of the auxiliary cavity inner cover 5, the burnt high-temperature gas is prevented from contacting the burning chamber 3 and the auxiliary cavity inner cover 5, the service life is prolonged, the working condition temperature is reduced, the temperature sensor 11 is arranged in the combustion chamber 3, the temperature sensor 11 outputs signals, the gas control valve 15 is adjusted through the temperature controller 14, the flow of natural gas is controlled, the purpose of controlling the temperature of the combustion chamber 3 is achieved, the pressure sensor 12 is arranged in the combustion chamber 3, the output frequency of the frequency converter 17 is adjusted through the programmable controller 16 by the pressure sensor 12, the rotating speed of the draught fan 8 is controlled, the purpose of controlling the pressure of combustion gas in the furnace chamber is achieved, the oxygen concentration sensor 13 is arranged in the combustion chamber 3, the signals are output by the oxygen concentration sensor 13, the opening degree of the heat insulation air return valve 18 and the opening degree of the mixed air valve 19 are adjusted through the programmable controller 16, and the purposes of controlling the air return flow in the furnace chamber and the oxygen concentration in the air storage chamber 2 are achieved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A direct combustion type natural gas hot air supply system is characterized in that: the gas storage device is characterized in that a combustor (1), a gas storage chamber (2), a combustion chamber (3), a nozzle (4), an auxiliary cavity inner cover (5), a gas transmission pipeline (6), a tail gas recovery pipe (7), an induced draft fan (8) and a heat source exchanger (9) are sequentially arranged according to the flowing process of gas, a gas pipeline (22) is connected below the combustor (1), one end of the gas storage chamber (2) is communicated with the combustor (1) and the other end of the gas storage chamber is connected with the combustion chamber (3), the nozzle (4) is respectively provided with six groups, the right end of the nozzle (4) is connected with the gas storage chamber (2) and the left end of the nozzle is positioned in the combustion chamber (3), the auxiliary cavity inner cover (5) is arranged on the inner wall of the combustion chamber (3) and the surface of the auxiliary cavity inner cover is provided with a plurality of groups of return air guide pipes (10), a detection mechanism is arranged in the combustion chamber (3) and the upper end of the combustion chamber is connected with the gas transmission pipeline (6), the tail end of the gas transmission pipeline (6) is connected with a tail gas recovery pipe (7), the lower end of the tail gas recovery pipe (7) is connected with an induced draft fan (8), the exhaust end of the induced draft fan (8) is connected with a heat source exchanger (9) through the gas transmission pipeline (6), and the heat source exchanger (9) is connected with the combustion chamber (3) through the gas transmission pipeline (6).

2. The direct-fired natural gas hot air supply system according to claim 1, characterized in that: temperature sensor (11), pressure sensor (12) and oxygen concentration sensor (13) of placing in combustion chamber (3) in the detection mechanism, temperature sensor (11) are connected with temperature controller (14) through the circuit, temperature controller (14) are connected with gas control valve (15) through the circuit, install on gas pipeline (22) gas control valve (15), pressure sensor (12) are connected with programmable controller (16) through the circuit, programmable controller (16) are connected with converter (17) through the circuit, converter (17) control draught fan (8), oxygen concentration sensor (13) are connected with programmable controller (16), programmable controller (16) are connected with thermal-insulated return air valve (18), mixed blast gate (19) through the line connection.

3. The direct-fired natural gas hot air supply system according to claim 1, characterized in that: the six groups of nozzles (4) are different in length and are arranged spirally, and the end parts of the six groups of nozzles (4) are positioned in the auxiliary cavity inner cover (5).

4. A direct combustion natural gas hot air supply system according to claim 3, wherein: a flow guide cavity channel (20) is formed between the auxiliary cavity inner cover (5) and the inner wall of the combustion chamber (3), and a plurality of groups of return air guide pipes (10) are obliquely arranged on the auxiliary cavity inner cover (5).

5. The direct-fired natural gas hot air supply system according to claim 4, characterized in that: the specifications of the two ends of the combustion chamber (3) are smaller than the specification of the middle part, and the upper left corner is provided with an explosion-proof opening (21).