CN211119336U - Radiant tube burner with low-temperature ejector - Google Patents
Radiant tube burner with low-temperature ejector Download PDFInfo
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- CN211119336U CN211119336U CN201922219234.6U CN201922219234U CN211119336U CN 211119336 U CN211119336 U CN 211119336U CN 201922219234 U CN201922219234 U CN 201922219234U CN 211119336 U CN211119336 U CN 211119336U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model relates to a combustion gas fuel's combustor field with stable flame device specifically is a take radiant tube nozzle of low temperature ejector. The utility model provides a take radiant tube nozzle of low temperature ejector, includes nozzle body (4) and nozzle shower nozzle (5), characterized by: the low-temperature ejector comprises a radiation pipe (1), a heat exchanger (2) and a low-temperature ejector (3), wherein the heat exchanger (2) comprises an air pipe (21) and a flue gas pipe (22); the low-temperature ejector (3) comprises an air spray pipe (31) and a flue gas ejector pipe (32), the air inlet end of the flue gas ejector pipe (32) is communicated with the inner cavity of the flue gas pipe (22), and the exhaust end of the flue gas ejector pipe (32) is communicated with the air spray pipe (31). The utility model discloses the burning is abundant, and temperature distribution is even, and nitrogen oxide discharges and reduces.
Description
Technical Field
The utility model relates to a combustion gas fuel's combustor field with stable flame device specifically is a take radiant tube nozzle of low temperature ejector.
Background
Along with the improvement of national environmental protection requirements, NO discharged by flue gas of a heating furnacexThe discharge index is more and more emphasized, in the field of metallurgical heating furnaces, the main equipment for heating is a burner, the main combustion energy in a steel mill is the secondary gas of the steel mill, the secondary gas comprises blast furnace gas, coke oven gas and converter gas, wherein the coke oven gas or mixed gas is most applied, and NO in the combustion product smoke of a burner nozzle is most usedx(i.e., nitrogen oxides, generally referred to as NO because they are mixtures of oxides of N element in various valence statesx) Is one of the main environmental control indexes.
In the radiant tube burner type, since the combustion is entirely in the radiant tube, the intensity of combustion heat is very high, and NO is producedxAlso the highest, simultaneously, because the burning in finite space also causes the radiant tube to burn easily leaks, burns and bends, the measure of taking at present includes, will radiate the whole promotion of tubular product matter or will be close to the promotion of nozzle part material, receive the heat resistant steel material to promote the restriction, its long-term service temperature also all is less than 1250 ℃. Still some nozzles increase air at the exit position of heat exchanger and draw and penetrate, but the flue gas draws and penetrates the backward flow rate all not high, generally is below 30%, because burning becomes unstable along with the increase of flue gas backward flow rate and even separates out a large amount of CO (being carbon monoxide), in order not to separate out CO in the production, can increase the air quantity to cause more not energy-conservingly.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect of the prior art, the utility model provides a gas combustion equipment that the burning is abundant, temperature distribution is even, nitrogen oxide discharges and reduces, the utility model discloses a take radiant tube nozzle of low temperature ejector.
The utility model discloses a following technical scheme reaches the invention purpose:
the utility model provides a take radiant tube nozzle of low temperature ejector, includes nozzle body and nozzle shower nozzle, and the front end of nozzle body is equipped with nozzle shower nozzle, characterized by: also comprises a radiant tube, a heat exchanger and a low-temperature ejector, the injection end of the nozzle is opposite to the inlet end of the radiant tube,
the heat exchanger comprises an air pipe and a flue gas pipe, the air pipe is sleeved in the flue gas pipe, the air inlet end of the air pipe of the heat exchanger is communicated with the outside atmosphere, the air outlet end of the air pipe is opposite to the air inlet end of the burner body, the air inlet end of the flue gas pipe of the heat exchanger is connected with the air outlet end of the radiation pipe, and the air outlet end of the flue gas pipe is communicated with the outside atmosphere;
the low-temperature ejector comprises an air spray pipe and a smoke ejection pipe, the air inlet end of the air spray pipe is connected with the air outlet end of the air pipe, the air outlet end of the air spray pipe is opposite to the air inlet end of the burner body, high-temperature air sprayed out of the air pipe is sprayed into the burner body through the air spray pipe, the air inlet end of the smoke ejection pipe is communicated with the inner cavity of the smoke pipe, and the air outlet end of the smoke ejection pipe is communicated with the air spray pipe.
The radiant tube burner with the low-temperature ejector is characterized in that: the air inlet end of the low-temperature ejector flue gas ejection pipe is connected with the side wall of the heat exchanger flue gas pipe, so that a side draft type is formed.
The radiant tube burner with the low-temperature ejector is characterized in that: the air inlet end of the low-temperature ejector smoke ejector pipe is encircled around the air spray pipe, so that an annular guide type is formed.
The radiant tube burner with the low-temperature ejector is characterized in that:
the radiant tube is U-shaped or W-shaped;
the air jet pipe of the low-temperature ejector is formed by sequentially connecting an ejection inlet section, an ejection contraction pipe and an ejection flaring section, and the inner diameters of the ejection inlet section and the ejection flaring section are larger than that of the ejection contraction pipe.
The use method of the radiant tube burner with the low-temperature ejector is characterized by comprising the following steps of: the method is implemented in sequence according to the following steps:
① burning, wherein the burner body mixes gas and air and sprays into the burner nozzle to ignite, and the oxygen in the gas and air generates violent oxidation-reduction reaction and releases heat;
② heat exchange, wherein high temperature flue gas generated by oxidation-reduction reaction enters from the inlet end of the radiant tube and is exhausted from the exhaust end of the radiant tube into the flue gas tube of the heat exchanger, low temperature air of the outside atmosphere enters the air tube of the heat exchanger, heat exchange is carried out between the high temperature flue gas and the low temperature air in the heat exchanger, the low temperature air is preheated by the high temperature flue gas, and the high temperature flue gas is cooled by the low temperature air;
③ injecting, wherein the preheated air enters the air jet pipe through the air pipe and is jetted into the burner body at high speed, part of the cooled flue gas is injected and is sucked into the air jet pipe from the flue gas pipe through the flue gas injection pipe in the air injection process, the cooled flue gas and the preheated air are mixed and then are jetted into the burner nozzle together, and the rest of the flue gas is exhausted into the outside atmosphere through the exhaust end of the flue gas pipe.
The utility model discloses an increase an efficient low temperature ejector between heat exchanger and nozzle, make the process of co-combustion slower, nevertheless the velocity of flow is very fast, and the flame can not observe obvious flame this moment, and "flameless burning" state promptly, the temperature field in whole radiant tube 1 this moment is very even, and NO is very even in the emission flue gasxThe (nitrogen oxide) content is very low.
The design idea of the utility model is as follows:
1. the burnout rate is improved, and the generation of CO is reduced:
at present, in the combustion process of a burner, in order to reduce the generation of toxic and harmful CO in combustion products, the excess air coefficient K must be increased, and in the present production, the value of K is generally set to be 1.2-1.4 and corresponds to O in flue gas2The content is 3-5%. If the smoke component contains O2The energy-saving combustion furnace can be completely combusted under the condition of low content, and does not generate CO, namely the excess air coefficient can be reduced, so that the aim of saving energy is fulfilled. According to the calculation of the exhaust gas temperature of 650 ℃, the energy consumption is increased by about 0.5% for every 0.1 increase of the air excess coefficient.
2. Reduce flame intensity and inhibit NOxGeneration of (a):
combustion to produce NOxIf the flame can be elongated as much as possible, the whole radiant tube is filled to the maximum extent, the heat intensity of the radiant tube is greatly reduced, and meanwhile, the whole radiant tube is filled with the flame, and the surface of the radiant tube is full of the flameThe surface uniformity is better, which is beneficial to the uniformity of heating products and prolonging the service life of the radiant tube. The gas has a certain burning speed, and if the average flow speed of the air gas is increased, the flame length can be effectively prolonged.
3. The oxygen concentration in the combustion air is reduced, and the combustion chemical reaction speed is reduced:
the essence of the flue gas recirculation is that the flue gas generated by combustion is reintroduced into a combustion area to realize the control of the concentration of oxides at the combustion temperature, thereby realizing the effects of reducing the emission of nitrogen oxides and saving energy
The flue gas recirculation technique reduces the maximum temperature in the flame region, and the reduction of the flame can reduce NOxIs performed. While flue gas recirculation reduces oxygen and nitrogen concentrations, also serving to reduce NOxThe function of (1). The high-temperature flue gas in the flue gas recirculation technology has the function of preheating the oxidant and the fuel, and has obvious energy-saving effect.
After the flue gas backflow technology is introduced into the radiant tube burner, the combustion reaction speed of the fuel is reduced. The volume of combustion air is greatly increased, and the expansion of flame length is also facilitated.
4. Flame dwell techniques, make the root flame more stable:
the volume of the air gas subjected to double preheating is multiplied in a thermal state, the flow velocity in the radiant tube with the same sectional area is also rapidly increased, and if no good flame staying structure exists, the danger of fire escape or even extinguishment can occur. Flame holding can be effectively realized by adopting staged combustion. Meanwhile, if the flame tracing of the long-time open fire ignition burner is adopted, stable flame staying can be realized.
The low-temperature ejector can adopt a side-lead low-temperature ejector and a ring-lead low-temperature ejector, the side-lead low-temperature ejector can flexibly select the position for ejecting the smoke according to the unit condition, the temperature of the ejected smoke is controlled, and the ejection port of the original heat exchanger or the newly-added smoke ejection port on the flue can be utilized to realize project reconstruction under the condition of not changing the original heat exchanger. The ring-lead low-temperature ejector has the characteristics of compact structure and small gas conveying resistance.
Drawings
Fig. 1 is a schematic structural view of the present invention when the low-temperature ejector adopts a side-draw type;
FIG. 2 is a schematic structural view of a side draw type low temperature eductor;
fig. 3 is a schematic structural view of the present invention when the low-temperature ejector adopts the ring-pull type;
fig. 4 is a schematic structural view of a ring-pull type low-temperature ejector.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
The utility model provides a take radiant tube nozzle of low temperature ejector, includes radiant tube 1, heat exchanger 2, low temperature ejector 3, nozzle body 4 and nozzle shower nozzle 5, as shown in fig. 1 and 2, concrete structure is:
the front end of the burner body 4 is provided with a burner nozzle 5, and the injection end of the burner nozzle 5 is opposite to the inlet end of the radiant tube 1;
the heat exchanger 2 comprises an air pipe 21 and a flue gas pipe 22, the air pipe 21 is sleeved in the flue gas pipe 22, the air inlet end of the air pipe 21 of the heat exchanger 2 is communicated with the outside atmosphere, the air outlet end of the air pipe 21 is opposite to the air inlet end of the burner body 4, the air inlet end of the flue gas pipe 22 of the heat exchanger 2 is connected with the air outlet end of the radiation pipe 1, and the air outlet end of the flue gas pipe 22 is communicated with the outside atmosphere;
the low-temperature ejector 3 comprises an air spray pipe 31 and a smoke ejection pipe 32, the air inlet end of the air spray pipe 31 is connected with the air outlet end of the air pipe 21, the air outlet end of the air spray pipe 31 is opposite to the air inlet end of the burner body 4, so that high-temperature air sprayed from the air pipe 21 is sprayed into the burner body 4 through the air spray pipe 31, the air inlet end of the smoke ejection pipe 32 is in through connection with the inner cavity of the smoke pipe 22, and the air outlet end of the smoke ejection pipe 32 is in through connection with the air spray pipe 31.
In fig. 1, arrow a indicates the air flow direction, arrow b indicates the gas flow direction, and arrow c indicates the flue gas flow direction.
In this embodiment, as shown in fig. 2: the air inlet end of the smoke injection pipe 32 of the low-temperature injector 3 is connected with the side wall of the smoke pipe 22 of the heat exchanger 2, so that a side-draft type is formed.
The radiant tube 1 is U-shaped or W-shaped, in this embodiment, W-shaped is selected
The air nozzle 31 of the low temperature eductor 3 is shown in fig. 2: the air nozzle 31 is formed by sequentially connecting an injection inlet section 311, an injection shrinkage pipe 312 and an injection expansion section 313, and the inner diameters of the injection inlet section 311 and the injection expansion section 313 are larger than that of the injection shrinkage pipe 312.
In this embodiment, the jet inner diameter of the jet inlet section 311 of the air nozzle 31 of the low-temperature ejector 3, i.e., the jet inner diameter a in fig. 2 is represented by unit length L, is 15mm to 45mm, preferably 25mm to 35mm, and B to H in fig. 2 respectively represent the following meanings:
b: the air nozzle 31 penetrates through the distance between the positions of the smoke injection pipes 32 and the injection inlet section 311,
c: the diameter of the air inlet end of the injection inlet section 311,
d: the diameter of the hole at the end of the injection shrinkage tube 312,
e: the hole diameter of the exhaust end of the injection flared section 313,
f: the injection inlet section 311 extends into the flue gas injection pipe to reach the distance between the connection part of the injection inlet section 311 and the injection shrinkage pipe 312,
g: the length of the injection shrinkage tube 312 is,
h: the length of the injection flared section 313;
the dimensions of B to H are shown in Table 1:
table 1:
meanwhile, the air spraying speed at the exhaust end of the air pipe 21 is 50m/s to 90 m/s.
When the method is used, the steps are implemented in sequence as follows:
① burning, wherein the burner body 4 mixes the gas and the air and then sprays the mixture into the burner nozzle 5 to be ignited, the gas and the oxygen in the air generate violent oxidation-reduction reaction and release heat;
② heat exchange, wherein high-temperature flue gas generated by oxidation-reduction reaction enters from the inlet end of the radiant tube 1 and is exhausted into the flue gas pipe 22 of the heat exchanger 2 from the exhaust end of the radiant tube 1, low-temperature air of the outside atmosphere enters the air pipe 21 of the heat exchanger 2, heat exchange is carried out between the high-temperature flue gas and the low-temperature air in the heat exchanger 2, the low-temperature air is preheated by the high-temperature flue gas, and the high-temperature flue gas is cooled by the low-temperature air;
③ injecting, wherein the preheated air enters the air nozzle 31 through the air pipe 21 and is injected into the burner body 4 at high speed, part of the cooled flue gas is injected and is sucked into the air nozzle 31 from the flue gas pipe 22 through the flue gas injection pipe 32 in the air injection process, the cooled flue gas and the preheated air are mixed and are injected into the burner nozzle 5 together, and the rest of the flue gas is exhausted into the outside atmosphere through the exhaust end of the flue gas pipe 22.
The experiment of the embodiment proves that when the coke oven gas is taken as the fuel gas, the effect under the condition of flameless combustion is shown in the following table 2:
table 2:
example 2
The utility model provides a take radiant tube nozzle of low temperature ejector, includes radiant tube 1, heat exchanger 2, low temperature ejector 3, nozzle body 4 and nozzle shower nozzle 5, as shown in fig. 3 and fig. 4, concrete structure is:
the front end of the burner body 4 is provided with a burner nozzle 5, and the injection end of the burner nozzle 5 is opposite to the inlet end of the radiant tube 1;
the heat exchanger 2 comprises an air pipe 21 and a flue gas pipe 22, the air pipe 21 is sleeved in the flue gas pipe 22, the air inlet end of the air pipe 21 of the heat exchanger 2 is communicated with the outside atmosphere, the air outlet end of the air pipe 21 is opposite to the air inlet end of the burner body 4, the air inlet end of the flue gas pipe 22 of the heat exchanger 2 is connected with the air outlet end of the radiation pipe 1, and the air outlet end of the flue gas pipe 22 is communicated with the outside atmosphere;
the low-temperature ejector 3 comprises an air spray pipe 31 and a smoke ejection pipe 32, the air inlet end of the air spray pipe 31 is connected with the air outlet end of the air pipe 21, the air outlet end of the air spray pipe 31 is opposite to the air inlet end of the burner body 4, so that high-temperature air sprayed from the air pipe 21 is sprayed into the burner body 4 through the air spray pipe 31, the air inlet end of the smoke ejection pipe 32 is in through connection with the inner cavity of the smoke pipe 22, and the air outlet end of the smoke ejection pipe 32 is in through connection with the air spray pipe 31.
In fig. 3, arrow a indicates the air flow direction, arrow b indicates the gas flow direction, and arrow c indicates the flue gas flow direction.
In this embodiment, as shown in fig. 4: the air inlet end of the smoke ejector pipe 32 of the low-temperature ejector 3 is surrounded on the periphery of the air nozzle 31, so that an annular guide type is formed.
The radiant tube 1 is U-shaped or W-shaped, in this embodiment, W-shaped is selected
The air nozzle 31 of the low temperature eductor 3 is shown in fig. 4: the air nozzle 31 is formed by sequentially connecting an injection inlet section 311, an injection shrinkage pipe 312 and an injection expansion section 313, and the inner diameters of the injection inlet section 311 and the injection expansion section 313 are larger than that of the injection shrinkage pipe 312.
In this embodiment, the jet inner diameter of the jet inlet section 311 of the air nozzle 31 of the low-temperature ejector 3, i.e., a unit length L shown as a in fig. 4, is 15mm to 45mm, preferably 25mm to 35mm, and D to H and K in fig. 4 respectively have the following meanings:
d: the diameter of the hole at the end of the injection shrinkage tube 312,
e: the hole diameter of the exhaust end of the injection flared section 313,
f: the distance from the exhaust end of the injection inlet section 311 to the joint of the injection inlet section 311 and the injection shrinkage pipe 312,
g: the length of the injection shrinkage tube 312 is,
h: the length of the injection flared section 313,
k: the outer diameter of the air inlet end of the air nozzle 31;
the dimensions of D to H and K are shown in Table 3:
table 3:
meanwhile, the air spraying speed at the exhaust end of the air pipe 21 is 50m/s to 90 m/s. .
The method of use of this example was the same as in example 1.
Claims (4)
1. The utility model provides a take radiant tube nozzle of low temperature ejector, includes nozzle body (4) and nozzle shower nozzle (5), and the front end of nozzle body (4) is equipped with nozzle shower nozzle (5), characterized by: the device also comprises a radiant tube (1), a heat exchanger (2) and a low-temperature ejector (3), wherein the spraying end of the burner nozzle (5) is opposite to the inlet end of the radiant tube (1),
the heat exchanger (2) comprises an air pipe (21) and a flue gas pipe (22), the air pipe (21) is sleeved in the flue gas pipe (22), the air inlet end of the air pipe (21) of the heat exchanger (2) is communicated with the external atmosphere, the air outlet end of the air pipe (21) is opposite to the air inlet end of the burner body (4), the air inlet end of the flue gas pipe (22) of the heat exchanger (2) is connected with the air outlet end of the radiation pipe (1), and the air outlet end of the flue gas pipe (22) is communicated with the external atmosphere;
the low-temperature ejector (3) comprises an air spray pipe (31) and a smoke ejection pipe (32), the air inlet end of the air spray pipe (31) is connected with the air outlet end of the air pipe (21), the air outlet end of the air spray pipe (31) just enables high-temperature air sprayed from the air pipe (21) to be sprayed into the burner body (4) through the air spray pipe (31) to the air inlet end of the burner body (4), the air inlet end of the smoke ejection pipe (32) is in through connection with the inner cavity of the smoke pipe (22), and the air outlet end of the smoke ejection pipe (32) is in through connection with the air spray pipe (31).
2. The radiant tube burner with low temperature eductor of claim 1 wherein: the air inlet end of the smoke injection pipe (32) of the low-temperature injector (3) is connected with the side wall of the smoke pipe (22) of the heat exchanger (2).
3. The radiant tube burner with low temperature eductor of claim 1 wherein: the air inlet end of the smoke ejector pipe (32) of the low-temperature ejector (3) is encircled around the air nozzle (31).
4. A radiant tube burner with a cryogenic eductor as claimed in any one of claims 1 to 3 wherein:
the radiant tube (1) is U-shaped or W-shaped;
the air nozzle (31) of the low-temperature ejector (3) is formed by sequentially connecting an ejection inlet section (311), an ejection contraction pipe (312) and an ejection expansion section (313), and the inner diameters of the ejection inlet section (311) and the ejection expansion section (313) are larger than that of the ejection contraction pipe (312).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922219234.6U CN211119336U (en) | 2019-12-12 | 2019-12-12 | Radiant tube burner with low-temperature ejector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922219234.6U CN211119336U (en) | 2019-12-12 | 2019-12-12 | Radiant tube burner with low-temperature ejector |
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| CN211119336U true CN211119336U (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524606A (en) * | 2020-12-04 | 2021-03-19 | 武汉科技大学 | Radiant tube burner capable of realizing flameless combustion by entraining smoke |
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2019
- 2019-12-12 CN CN201922219234.6U patent/CN211119336U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524606A (en) * | 2020-12-04 | 2021-03-19 | 武汉科技大学 | Radiant tube burner capable of realizing flameless combustion by entraining smoke |
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