CN215446457U

CN215446457U - Combustion engine

Info

Publication number: CN215446457U
Application number: CN202121795515.7U
Authority: CN
Inventors: 何为; 刘得胜; 曹进; 孙宇; 韩兵兵; 蔚成亮; 张玉雪; 刘玉珍; 刘银玲
Original assignee: Qingdao Annai Industrial Technology Co ltd
Current assignee: Qingdao Annai Industrial Technology Co ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2022-01-07
Anticipated expiration: 2031-08-03

Abstract

A combustion engine comprises a fuel supplier and a fuel supply pipe connected with the fuel supplier; the air storage chamber is communicated with the fan; the fuel supply pipe is connected with a combustion head, an air inlet device I communicated with the air storage chamber is arranged on the combustion head, a radiation pipe is arranged on the periphery of the combustion head and fixedly connected with the shell, an air inlet device II communicated with the air storage chamber is arranged between the radiation pipe and the combustion head, and when the fuel is stably combusted, the length of flame in the radiation pipe is 4m-6 m. The gas entering the radiant tube from the gas storage chamber can provide oxygen for the combustion of flame in the radiant tube on one hand, and can prolong the flame length in the radiant tube on the other hand, so that the flame length is ensured to reach 4-6 m, and further the fuel is fully combusted.

Description

Combustion engine

Technical Field

The utility model relates to the technical field of combustion engines, in particular to a combustion engine.

Background

The low-nitrogen combustor, namely a low-nitrogen oxide combustor, is a combustor with low NOx emission in the fuel combustion process, and the low-NOx combustor can reduce the emission of nitrogen oxides in the combustion process. The nitrogen oxides produced during combustion are mainly NO and NO₂These two nitrogen oxides are commonly referred to as nitrogen oxides NOx.

A large number of experimental results show that the nitrogen oxides discharged by the combustion device are mainly NO, and the nitrogen oxides account for about 95 percent on average₂Only about 5 percent. The NO produced by the combustion of typical fuels comes primarily from two areas: firstly, oxidation of nitrogen in air (combustion air) used for combustion; secondly, the nitride contained in the fuel is thermally decomposed and reoxidized in the combustion process. In most combustion plants, the former is the primary source of NO, and we refer to this type of NO as "thermally reacted NO", the latter as "fuel NO", and in addition "prompt NO".

NO formed during combustion may react with nitrogen atom-containing intermediates to reduce NO to NO₂. In fact, in addition to these reactions, NO can also react with various nitrogen-containing compounds to form NO₂. NO when the reaction reaches chemical equilibrium in the actual combustion plant₂In very small proportions, i.e. NO converted to NO₂Rarely, negligible; can be used forNOx reduction is achieved by improving combustion technology.

Low-nitrogen burners currently on the market are mainly classified into the following types:

1. a surface combustion low-nitrogen burner;

surface-fired low-nitrogen burners typically control NOx to within 30 milligrams over the full fire range, with the advantage of simple installation and no need for FGR flue gas recirculation piping; the main disadvantages are that air is required to be filtered, which increases the maintenance workload; meanwhile, the oxygen content is about 7%, and the partial combustion efficiency is reduced.

2. A staged combustor;

the staged burner can generally control the NOx to 65 mg in the full fire range, the limit is about 40 mg, further reducing the NOx emission may cause unstable combustion, and the oxygen supply ratio of the existing staged burner is not easy to control during combustion in different stages, which causes the NOx emission not easy to reduce.

3. The staged combustor and FGR flue gas are in a circulating technology;

the circulation technology of the staged combustor and the FGR flue gas combines the advantages of NOx control of the staged combustor and the advantage of oxygen reduction content of the FGR, the control of NOx to a level of 20 mg in the full-fire range can be realized, the oxygen content is controlled within 3 percent, the combustion efficiency is maximized, and the main short point is that the equipment cost is improved.

In addition, the combustion engine in the prior art has insufficient combustion and generates more nitrogen oxides, which is a disadvantage in the prior art.

Disclosure of Invention

The utility model aims to solve the technical problem that the prior art is insufficient, and provides a combustor which can fully combust fuel.

The scheme is realized by the following technical measures: a combustion engine comprises a fuel supplier and a fuel supply pipe connected with the fuel supplier; the air storage chamber is communicated with the fan; the fuel supply pipe is connected with a combustion head, an air inlet device I communicated with the air storage chamber is arranged on the combustion head, a radiation pipe is arranged on the periphery of the combustion head and fixedly connected with the shell, an air inlet device II communicated with the air storage chamber is arranged between the radiation pipe and the combustion head, and when the fuel is stably combusted, the length of flame in the radiation pipe is 4m-6 m. By adopting the technical scheme, the gas entering the radiation pipe from the gas storage chamber can provide oxygen for the combustion of flame in the radiation pipe on one hand, and can prolong the flame length in the radiation pipe on the other hand, so that the flame length is ensured to reach 4m-6m, and further the fuel is fully combusted.

Preferably, the inner wall of the radiant tube is a rough surface, and a protrusion is arranged on the inner wall of the radiant tube. By adopting the technical scheme, the bulges are arranged inside the radiation tubes, so that the heat exchange area of the radiation tubes is greatly increased, and the heat exchange efficiency of the radiation tubes is further improved.

Preferably, the combustion head comprises a sleeve I fixedly connected with the fuel supply pipe, a sleeve II is sleeved on the periphery of the sleeve I, and the sleeve II is fixedly connected with the sleeve I; the air inlet device I is directly communicated with the air storage chamber and comprises an air inlet I arranged on the fuel supply pipe, an air inlet II arranged on the sleeve I and an air inlet gap I arranged between the sleeve II and the sleeve I; and the air inlet device II comprises an air inlet gap II arranged between the sleeve II and the radiant tube. By adopting the technical scheme, air entering the fuel supply pipe from the air inlet I is mixed with fuel, namely primary combustion, namely full premix combustion is carried out; the mixed gas sprayed from the fuel supply pipe is subjected to secondary combustion in the sleeve I; the fuel enters the sleeve II from the air inlet gap I and is subjected to tertiary combustion at the tail end of the sleeve I, and enters the radiant tube from the air inlet gap II and is subjected to quaternary combustion in the radiant tube. Because inlet port I, inlet port II, air inlet gap I and air inlet gap II all directly communicate with the air receiver, under the stable combustion state, the pressure in the air receiver is comparatively stable, is convenient for control the air input of burning at different levels, and then realizes the low-nitrogen combustion easily. And the gas entering the radiant tube from the gas inlet gap II can provide oxygen in four-stage combustion on one hand, and can push flame to run in the radiant tube on the other hand.

Preferably, the temperature of the outer wall of the radiant tube is 380-400 ℃ during stable combustion. By adopting the technical scheme, the gas entering the radiant tube from the gas inlet gap II can reduce the combustion temperature in the radiant tube and effectively reduce the generation of nitrogen oxides NOx.

Preferably, sleeve II passes through connecting plate fixed connection with sleeve I, the connecting plate circumference evenly is provided with a plurality ofly. By adopting the technical scheme, the sleeve I is fixedly arranged on the fuel supply pipe, and the sleeve II is connected with the sleeve I through the connecting plate, so that the sleeve I is convenient to fix; the connecting plate is provided with a plurality of, guarantees the stability that sleeve II and sleeve I are connected.

Preferably, the air inlet holes II are formed in the end portion of the sleeve I, and a plurality of air inlet holes are uniformly formed in the circumferential direction of the air inlet holes II. By adopting the technical scheme, the air inlet holes II are arranged at the end part of the sleeve I, so that air in the air storage chamber can conveniently enter the sleeve I through the air inlet holes II, the air inlet holes II are arranged in a plurality of positions, on one hand, the requirement of air inflow can be met, and on the other hand, the air can be guaranteed to uniformly enter the sleeve I.

Preferably, an igniter and a flame detector which can extend into the sleeve I are fixedly connected to the sleeve I.

Preferably, the air intake area of the air intake port i is S1, the air intake area of the air intake port ii is S2, the air intake area of the air intake slit i is S3, S1: s2: s3 is 1.5-2: 1: 2-3. By adopting the technical scheme, the air supply amount of combustion at all levels is conveniently controlled, and a better combustion effect is achieved.

Preferably, the tail end of the fuel supply pipe extends into the sleeve I, and the length of the sleeve II is greater than that of the sleeve I; the pressure in the air reservoir is greater than the pressure in the fuel supply tube. By adopting the technical scheme, air in the air storage chamber can enter the fuel supply pipe through the air inlet I, and meanwhile, fuel can be reduced from entering the air storage chamber from the fuel supply pipe.

Therefore, compared with the prior art, the utility model has substantive characteristics and progress, and the beneficial effects of the implementation are also obvious.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a burner head;

in the figure: 1-fuel supply pipe, 2-air supply cavity, 3-air storage chamber, 4-fuel supply pipe, 4.1-air inlet I, 5-sleeve I, 5.1-air inlet II, 6-flame detector, 7-igniter, 8-sleeve II, 9-air inlet gap I, 10-radiation pipe, 10.1-bulge, 11-air inlet gap II, 12-connecting plate, 13-fuel supply device, 14-fan and 15-pressure stabilizing chamber.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments and drawings. 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 scope of protection of this patent.

As shown in the drawings, a combustion engine includes a fuel supplier 13 and a fuel supply pipe 4 connected to the fuel supplier 13; a fan 14 and an air reservoir 3 communicating with the fan 14; the fuel supply pipe 4 is connected with a combustion head, an air inlet device I communicated with the air storage chamber 3 is arranged on the combustion head, a radiation pipe 10 is arranged on the periphery of the combustion head, the radiation pipe 10 is fixedly connected with the shell, an air inlet device II communicated with the air storage chamber is arranged between the radiation pipe 10 and the combustion head, and when the fuel is stably combusted, the length of flame in the radiation pipe 10 is 4m-6 m. The gas entering the radiant tube 10 from the gas storage chamber 3 can provide oxygen for the combustion of flame in the radiant tube 10 on one hand, and can prolong the flame length in the radiant tube 10 on the other hand, so that the flame length is ensured to reach 4m-6m, and further the fuel is fully combusted. The fuel supplier 13 supplies fuel for combustion through the fuel supply pipe 4, and the blower 14 supplies air required for combustion through the air receiver 3.

Further, the inner wall of the radiant tube 10 is a rough surface, and a protrusion is arranged on the inner wall of the radiant tube 10. The inner part of the radiant tube 10 is provided with the bulge, so that the heat exchange area of the radiant tube 10 is greatly increased, and the heat exchange efficiency of the radiant tube 10 is further improved.

Further, the combustion head comprises a sleeve I5 fixedly connected with the fuel supply pipe 4, a sleeve II 8 is sleeved on the periphery of the sleeve I5, and the sleeve II 8 is fixedly connected with the sleeve I5; the air inlet device I is directly communicated with the air storage chamber 3 and comprises an air inlet I4.1 arranged on the fuel supply pipe 4, an air inlet II 5.1 arranged on the sleeve I5 and an air inlet gap I9 arranged between the sleeve II 8 and the sleeve I5; the air inlet device II comprises an air inlet gap II 11 arranged between the sleeve II 8 and the radiant tube 10.

Further, when the combustion is stable, the temperature of the outer wall of the radiant tube 10 is 380-400 ℃. The gas entering the radiant tube 10 from the air inlet gap II 11 can reduce the combustion temperature in the radiant tube 10, and effectively reduce the generation of nitrogen oxides NOx.

Further, sleeve II 8 passes through connecting plate 12 fixed connection with sleeve I5, connecting plate 12 circumference evenly is provided with a plurality ofly. The sleeve I5 is fixedly arranged on the fuel supply pipe 4, and the sleeve II 8 is connected with the sleeve I5 through a connecting plate 12, so that the sleeve I5 is convenient to fix; the connecting plate 12 is provided with a plurality of, guarantees the stability that II 8 of sleeve and I5 of sleeve are connected.

Further, air inlet II 5.1 sets up the tip at sleeve I5, air inlet II 5.1 circumference evenly is provided with a plurality ofly. Set up inlet port II 5.1 at the tip of sleeve I5, make things convenient for the air in the reservoir 3 to pass through in inlet port II 5.1 gets into sleeve I5, inlet port II 5.1 is provided with a plurality ofly, can satisfy the requirement of air input on the one hand, and on the other hand can guarantee that the air gets into in sleeve I5 comparatively evenly.

Further, an igniter 7 and a flame detector 6 which can extend into the sleeve I5 are fixedly connected to the sleeve I5.

Further, the air intake area of the air intake hole i 4.1 is S1, the air intake area of the air intake hole ii 5.1 is S2, the air intake area of the air intake slit i 9 is S3, S1: s2: s3 is 1.5-2: 1: 2-3. The air supply amount of each stage of combustion is conveniently controlled, and a better combustion effect is achieved.

Further, the tail end of the fuel supply pipe 4 extends into the sleeve I5, and the length of the sleeve II 8 is larger than that of the sleeve I5; the pressure in the air reservoir 3 is greater than the pressure in the fuel supply pipe 4. Air in the air storage chamber 3 can enter the fuel supply pipe 4 through the air inlet I4.1, and meanwhile, the fuel can be reduced from entering the air storage chamber 3 from the fuel supply pipe 4.

Air entering the fuel supply pipe 4 from the air inlet I4.1 is mixed with fuel, namely primary combustion, namely full premix combustion is carried out; the mixed gas sprayed from the fuel supply pipe 4 is subjected to secondary combustion in the sleeve I5; the fuel enters the sleeve II 8 from the air inlet gap I9 and is subjected to three-stage combustion at the tail end of the sleeve I5, and enters the radiant tube 10 from the air inlet gap II 11 and is subjected to four-stage combustion in the radiant tube 10. Because inlet port I4.1, inlet port II 5.1, air inlet gap I9 and air inlet gap II 11 all directly communicate with air receiver 3, under the stable combustion state, the pressure in air receiver 3 is comparatively stable, is convenient for control the air input of burning at all levels, and then realizes the low-nitrogen combustion easily. The gas entering the radiant tube from the gas inlet gap II 11 can provide oxygen in four-stage combustion on one hand and can push flame to run in the radiant tube 10 on the other hand. The radiant tube 10 is used as a four-stage combustion chamber, the flame length can reach 4m-6m, tail gas of first-stage combustion can be fully mixed with flame of second-stage combustion and combusted, tail gas of second-stage combustion can be fully mixed with flame of third-stage combustion and combusted, and the flame can reach 4m-6m during four-stage combustion to achieve the effect of full combustion.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features and inventive features disclosed herein.

Claims

1. A combustor is characterized in that: comprises a fuel supplier and a fuel supply pipe connected with the fuel supplier; the air storage chamber is communicated with the fan; the fuel supply pipe is connected with a combustion head, an air inlet device I communicated with the air storage chamber is arranged on the combustion head, a radiation pipe is arranged on the periphery of the combustion head and fixedly connected with the shell, an air inlet device II communicated with the air storage chamber is arranged between the radiation pipe and the combustion head, and when the fuel is stably combusted, the length of flame in the radiation pipe is 4m-6 m.

2. The combustion engine of claim 1, wherein: the inner wall of the radiant tube is a rough surface, and the inner wall of the radiant tube is provided with a bulge.

3. The combustion engine of claim 1, wherein: when the combustion is stable, the temperature of the outer wall of the radiant tube is 360-420 ℃.

4. The combustion engine of claim 1, wherein: the combustion head comprises a sleeve I fixedly connected with a fuel supply pipe, a sleeve II is sleeved on the periphery of the sleeve I, and the sleeve II is fixedly connected with the sleeve I; the air inlet device I is directly communicated with the air storage chamber and comprises an air inlet I arranged on the fuel supply pipe, an air inlet II arranged on the sleeve I and an air inlet gap I arranged between the sleeve II and the sleeve I; and the air inlet device II comprises an air inlet gap II arranged between the sleeve II and the radiant tube.

5. The combustion engine of claim 4, wherein: sleeve II passes through connecting plate fixed connection with sleeve I, the connecting plate circumference evenly is provided with a plurality ofly.

6. The combustion engine of claim 4, wherein: the air inlet holes II are formed in the end portion of the sleeve I, and a plurality of air inlet holes are evenly formed in the circumferential direction of the air inlet holes II.

7. The combustion engine of claim 4, wherein: an igniter and a flame detector which can extend into the sleeve I are fixedly connected to the sleeve I.

8. The combustion engine of claim 4, wherein: the air inlet area of the air inlet I is S1, the air inlet area of the air inlet II is S2, the air inlet area of the air inlet gap I is S3, S1: s2: s3 is 1.5-2: 1: 2-3.

9. The combustion engine of claim 4, wherein: the tail end of the fuel supply pipe extends into the sleeve I, and the length of the sleeve II is larger than that of the sleeve I.

10. The combustion engine of claim 4, wherein: the pressure in the air reservoir is greater than the pressure in the fuel supply tube.