CN210179628U - Ultralow-nitrogen combustion system for low-calorific-value gas - Google Patents
Ultralow-nitrogen combustion system for low-calorific-value gas Download PDFInfo
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- CN210179628U CN210179628U CN201920799904.3U CN201920799904U CN210179628U CN 210179628 U CN210179628 U CN 210179628U CN 201920799904 U CN201920799904 U CN 201920799904U CN 210179628 U CN210179628 U CN 210179628U
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Abstract
The utility model relates to the technical field of ultra-low nitrogen combustion equipment, in particular to an ultra-low nitrogen combustion system for low calorific value gas, which comprises a burner, a gas pipeline, a combustion-supporting air pipeline, a heat storage and combustion stabilization chamber, a boiler furnace, a boiler tail flue, a chimney, a circulating flue gas pipeline and a combustion-supporting fan; compared with the prior art, the ignition and combustion supporting of the high-calorific-value gas are not depended on, and the direct ignition and stable combustion of the low-calorific-value gas can be realized; by adopting the staged combustion technology, the generation of fuel type nitrogen oxides can be effectively inhibited, and the nitrogen oxides at the outlet of the combustor are controlled at a lower level; a denitration agent pipeline is arranged in a heat storage and combustion stabilization chamber at the outlet of the combustor, so that NOx generated by combustion is fully mixed with the denitration agent sprayed by the spray gun and quickly reacts, and 50-60% of denitration efficiency can be obtained. The low-calorific-value gas ultra-low nitrogen combustion system has the characteristics of simple structure, compact layout, convenience in maintenance and low investment and operation cost, and can stably realize the emission of ultra-low nitrogen oxides for a long time.
Description
Technical Field
The utility model relates to an ultralow nitrogen combustion apparatus technical field, concretely relates to ultralow nitrogen combustion system for low heat value gas.
Background
The current environmental protection policy is increasingly strict, and no matter whether high-calorific-value gas fuel such as natural gas is combusted or low-calorific-value gas fuel such as blast furnace gas is combusted, the concentration of nitrogen oxides in flue gas of the fuel is required to meet ultra-low emission guarantee, namely the concentration of NOx emission is lower than 50mg/Nm3 and even lower than 30mg/Nm 3. For low-heat value fuel gas with the heat value lower than 10MJ/m3, due to the reasons of difficult ignition, unstable combustion, slow burnout speed and the like, the combustion stability and the burnout efficiency are ensured by generally adopting means such as concentrated air supply, oxygen-enriched combustion and the like, and the low-nitrogen combustion is difficult to realize really.
The NOx emission concentration of the current operating low-heating-value gas burner is generally about 100-150mg/Nm3 and is far away from the ultralow emission standard. If the selective non-catalytic reduction denitration technology is adopted to install the SNCR spray gun in the boiler furnace, because the reaction temperature range in the boiler is limited and the residence time of the flue gas is short, the denitration agent and the nitrogen oxide are not fully reacted, the denitration efficiency is only about 40 percent, and the ultralow emission requirement cannot be met; if the SCR selective catalytic reduction denitration technology is adopted, an SCR reactor is arranged at the tail of a boiler, although the denitration efficiency is high and can meet the requirement of ultralow emission, the initial investment cost and the operation cost are high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ultralow nitrogen combustion system for low heat value gas to not enough among the prior art. Aiming at low-calorific-value gas fuels such as blast furnace gas, converter gas, generator gas and the like, the low-nitrogen combustion and selective non-catalytic reduction denitration integrated novel combustion system realizes the ultralow emission standard that the NOx emission concentration is lower than 50mg/Nm3 or even lower than 30mg/Nm3 on the premise of ensuring the combustion stability and high burnout efficiency.
The purpose of the utility model is realized through the following technical scheme: the application provides an ultralow nitrogen combustion system for low-calorific-value gas, which comprises a combustor, a gas pipeline, a combustion-supporting air pipeline, a heat storage and combustion stabilization chamber, a boiler hearth, a boiler tail flue, a chimney, a circulating flue gas pipeline and a combustion-supporting fan, wherein the combustor is connected with the gas pipeline; the boiler furnace is communicated with a boiler tail flue and a chimney in sequence; the gas pipeline and the combustion-supporting air pipeline are respectively communicated with the gas inlet end of the burner, the gas outlet end of the burner is communicated with the heat storage and combustion stabilization chamber, and the heat storage and combustion stabilization chamber is communicated with the boiler hearth; the side part of the heat storage stable combustion chamber is communicated with a plurality of denitration agent pipelines, and each denitration agent pipeline is communicated with a pin removal spray gun; the air outlet of the combustion-supporting fan is communicated with a combustion-supporting air pipeline, the air inlet of the combustion-supporting fan is respectively communicated with a circulating flue gas pipeline and an air pipeline, the circulating flue gas pipeline is communicated with a tail flue of the boiler, and the air pipeline is communicated with the atmosphere.
Wherein the circulating flue gas pipeline is provided with a regulating valve.
The combustor comprises a central gas spray pipe, an annular gas spray pipe and a combustor shell which are sequentially and concentrically arranged from inside to outside, the central gas spray pipe and the annular gas spray pipe are arranged at intervals and jointly enclose an inner secondary air nozzle, and a gap is reserved between the annular gas spray pipe and the combustor shell and encloses an outer secondary air nozzle.
Wherein, the gas pipeline is respectively communicated with the central gas spray pipe and the annular gas spray pipe, and the combustion-supporting air pipeline is respectively communicated with the inner secondary air nozzle and the outer secondary air nozzle.
Wherein, the place ahead of central gas spray tube is installed the central section of thick bamboo that surely fires, and the central section of thick bamboo that surely fires is linked together with combustion-supporting wind pipeline.
Wherein, an ignition gun is arranged in the central gas spray pipe.
And along the gas spraying direction, the distance between the central gas spray pipe and the heat storage and combustion stabilization chamber, the distance between the inner overgrate air nozzle and the heat storage and combustion stabilization chamber, the distance between the annular gas spray pipe and the heat storage and combustion stabilization chamber and the distance between the outer overgrate air nozzle and the heat storage and combustion stabilization chamber are gradually reduced.
Wherein the diameter of the heat storage and combustion stabilization chamber is 1.0m-4.0 m.
Wherein, the length of the heat storage and combustion stabilization chamber is 0.5m-2.0 m.
Wherein, the inner surface of the heat storage stable combustion chamber is laid with a refractory pouring material.
The utility model has the advantages that: compared with the prior art, the combustion system adopts a heat storage and combustion stabilization technology, and can realize direct ignition and stable combustion of low-heat-value gas without depending on ignition and combustion supporting of high-heat-value gas; a stable combustion cylinder is designed in the center of the burner, so that the ignition success rate and the combustion flame continuity can be improved; the outlet of the burner is provided with a heat storage and combustion stabilization chamber which fully absorbs the radiant heat of the combustion flame to improve the regional temperature of the burner and realize stable combustion and high burnout rate; by adopting a staged combustion technology, fuel and combustion-supporting air are fed in stages, so that the chemical equivalent of the whole combustion process of fuel gas can be effectively controlled, the generation of fuel type nitrogen oxides is inhibited, and the nitrogen oxides at the outlet of a combustor are controlled at a lower level of 50-70mg/Nm 3; a denitration agent pipeline and a spray gun are arranged in a heat storage and combustion stabilization chamber at the outlet of the combustor, so that NOx generated by combustion is fully mixed with the denitration agent sprayed by the spray gun and quickly reacts, and 50-60% of denitration efficiency can be obtained. The low-calorific-value gas ultra-low nitrogen combustion system has the characteristics of simple structure, compact layout, convenience in maintenance and low investment and operation cost, and can stably realize the emission of ultra-low nitrogen oxides for a long time.
Drawings
The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.
Fig. 1 is a flow chart of the ultra-low nitrogen combustion system for low heating value fuel gas of the present embodiment.
Fig. 2 is a schematic structural diagram of a burner of the ultra-low nitrogen combustion system for low heating value gas of the present embodiment.
Description of the drawings: the device comprises a combustor 1, a gas pipeline 2, a combustion-supporting air pipeline 3, a heat storage and combustion stabilization chamber 4, a denitrifier pipeline 5, a boiler hearth 6, a boiler tail flue 7, a chimney 8, a circulating flue gas pipeline 9, an adjusting valve 10, an air pipeline 11, a combustion-supporting fan 12, a central gas spray pipe 101, an annular gas spray pipe 102, a central combustion stabilization cylinder 201, an inner secondary air nozzle 202, an outer secondary air nozzle 203, an ignition gun 301, a denitration spray gun 401 and a castable 501.
Detailed Description
The invention will be further described with reference to the following examples.
The utility model discloses a specific implementation mode of an ultralow nitrogen combustion system for low heat value gas, as shown in fig. 1, its structure includes combustor 1, gas pipeline 2, combustion-supporting wind pipeline 3, heat accumulation combustion stabilizing chamber 4, boiler furnace 6, boiler afterbody flue 7, chimney 8, circulation flue gas pipeline 9 and combustion-supporting fan 12. Specifically, a boiler furnace 6 is communicated with a boiler tail flue 7 and a chimney 8 in sequence; the gas pipeline 2 and the combustion-supporting air pipeline 3 are respectively communicated with the gas inlet end of the combustor 1, the gas outlet end of the combustor 1 is communicated with the heat storage and combustion stabilization chamber 4, and the heat storage and combustion stabilization chamber 4 is communicated with the boiler hearth 6; a plurality of denitration agent pipelines 5 are communicated with the side part of the heat storage and combustion stabilization chamber 4, and each denitration agent pipeline 5 is communicated with a pin removal spray gun 401; an air outlet of a combustion-supporting fan 12 is communicated with a combustion-supporting air pipeline 3, an air inlet of the combustion-supporting fan 12 is respectively communicated with a circulating flue gas pipeline 9 and an air pipeline 11, the circulating flue gas pipeline 9 is communicated with a tail flue 7 of the boiler, and the air pipeline 11 is communicated with the atmosphere. The working principle is as follows: the flame (high-temperature flue gas) at the outlet of the combustor 1 firstly passes through the heat storage and combustion stabilization chamber 4 and then enters the boiler hearth 6 to exchange heat with each heating surface, and the low-temperature flue gas after heat exchange is discharged into the atmosphere through the boiler tail flue 7 and the chimney 8. The middle part of the tail flue 7 is communicated with a circulating flue gas pipeline 9, circulating flue gas is mixed with air in an air pipeline 11 through an adjusting valve 10, and the mixture is boosted by a combustion fan 12 and then sent into the combustor 1.
In this embodiment, the circulating flue gas duct 9 is provided with an adjusting valve 10, by means of which adjusting valve 10 the ratio of circulating flue gas and air entering the burner can be changed, so as to adjust the oxygen content of the combustion air for obtaining the best low nitrogen combustion effect.
Referring to fig. 2, the burner 1 includes a central gas nozzle 101, an annular gas nozzle 102 and a burner housing, which are concentrically arranged from inside to outside, the central gas nozzle 101 and the annular gas nozzle 102 are arranged at intervals and jointly enclose an inner secondary air nozzle 202, and a gap is left between the annular gas nozzle 102 and the burner housing and encloses an outer secondary air nozzle 203. It should be emphasized that the burner 1 of the present application is of a concentric circular configuration, from the inside to the outside: the gas burner comprises a central gas nozzle 101, a central combustion stabilizing cylinder 201, an inner secondary air nozzle 202, an annular gas nozzle 102 and an outer secondary air nozzle 203.
Referring to fig. 2, the gas pipeline 2 is respectively communicated with the central gas nozzle 101 and the annular gas nozzle 102, and the combustion-supporting air pipeline 3 is respectively communicated with the inner secondary air nozzle 202 and the outer secondary air nozzle 203, wherein a central combustion-stabilizing cylinder 201 is installed in front of the central gas nozzle 101, and the central combustion-stabilizing cylinder 201 is communicated with the combustion-supporting air pipeline 3. The working process is as follows, low-calorific-value gas is sent into the central gas spray pipe 101 and the annular gas spray pipe 102 through the gas pipeline 2, and combustion-supporting air is sent into the central stable combustion cylinder 201, the inner secondary air nozzle 202 and the outer secondary air nozzle 203 through the combustion-supporting air pipeline 3.
In this embodiment, an ignition gun 301 is disposed within the central gas nozzle 101. The central gas nozzle 101 is connected with the central combustion stabilizing cylinder 201, primary fuel required by ignition enters the central combustion stabilizing cylinder 201 through the central gas nozzle 101 and is mixed with combustion-supporting air, an electric arc released by the ignition gun 301 ignites the primary fuel, and secondary fuel fed into the annular gas nozzle 102 is ignited in the process of outward diffusion of combustion flame.
As a preferable scheme, a plurality of swirl guide blades are arranged in both the inner secondary air nozzle 202 and the outer secondary air nozzle 203, and combustion-supporting air is intensively mixed with secondary fuel fed by the annular gas nozzle 102 in a rotary jet manner to supplement oxygen required by gas combustion in time.
In the present embodiment, in order to further improve the combustion flame continuity and combustion efficiency. Along the gas spraying direction, the distance between the central gas spraying pipe 101 and the heat storage and combustion stabilization chamber 4, the distance between the inner overgrate air nozzle 202 and the heat storage and combustion stabilization chamber 4, the distance between the annular gas spraying pipe 102 and the heat storage and combustion stabilization chamber 4 and the distance between the outer overgrate air nozzle 203 and the heat storage and combustion stabilization chamber 4 are gradually reduced.
In the embodiment, the heat storage and combustion stabilization chamber 4 is of a cylindrical structure, the pouring material 501 (refractory pouring material) laid on the inner surface accumulates the heat released by the combustion of the gas, and the smoke temperature of the region is kept at about 700-900 ℃, so that the stability of the gas flame is ensured, conditions are created for realizing deep air classification and anoxic combustion, the generation of fuel type nitrogen oxides is effectively inhibited, and the nitrogen oxides at the outlet of the combustor are controlled at a lower level of 50-70mg/Nm 3; the denitration spray gun 401 and the denitration agent pipeline 5 connected with the denitration spray gun are arranged on the periphery of the heat storage stable combustion chamber 4, the denitration agent and the nitric oxide quickly react at the temperature of 700-900 ℃, and the denitration efficiency reaches 50-60%. The diameter D of the heat storage and combustion stabilization chamber 4 depends on the rated power heat load intensity of the burner, and the value range is 1.0-4.0 m; the length L depends on the length of the gas flame, and the value range of the length L is 0.5-2.0 m.
The combustion system of the embodiment adopts a heat storage and combustion stabilization technology, and can realize direct ignition and stable combustion of low-heat-value gas without depending on ignition and combustion supporting of high-heat-value gas; a stable combustion cylinder is designed in the center of the burner, so that the ignition success rate and the combustion flame continuity can be improved; the outlet of the burner is provided with a heat storage and combustion stabilization chamber which fully absorbs the radiant heat of the combustion flame to improve the regional temperature of the burner and realize stable combustion and high burnout rate; by adopting a staged combustion technology, fuel and combustion-supporting air are fed in stages, so that the chemical equivalent of the whole combustion process of fuel gas can be effectively controlled, the generation of fuel type nitrogen oxides is inhibited, and the nitrogen oxides at the outlet of a combustor are controlled at a lower level of 50-70mg/Nm 3; a denitration agent pipeline and a spray gun are arranged in a heat storage and combustion stabilization chamber at the outlet of the combustor, so that NOx generated by combustion is fully mixed with the denitration agent sprayed by the spray gun and quickly reacts, and 50-60% of denitration efficiency can be obtained. The low-calorific-value gas ultra-low nitrogen combustion system has the characteristics of simple structure, compact layout, convenience in maintenance and low investment and operation cost, and can stably realize the emission of ultra-low nitrogen oxides for a long time.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. An ultra-low nitrogen combustion system for low heating value fuel gas, characterized in that: the device comprises a combustor (1), a gas pipeline (2), a combustion-supporting air pipeline (3), a heat storage and combustion stabilization chamber (4), a boiler hearth (6), a boiler tail flue (7), a chimney (8), a circulating flue gas pipeline (9) and a combustion-supporting fan (12);
the boiler furnace (6) is communicated with a boiler tail flue (7) and a chimney (8) in sequence;
the gas pipeline (2) and the combustion-supporting air pipeline (3) are respectively communicated with the gas inlet end of the combustor (1), the gas outlet end of the combustor (1) is communicated with the heat storage and combustion stabilization chamber (4), and the heat storage and combustion stabilization chamber (4) is communicated with the boiler hearth (6);
a plurality of denitration agent pipelines (5) are communicated with the side part of the heat storage and combustion stabilization chamber (4), and each denitration agent pipeline (5) is communicated with a pin removal spray gun (401);
an air outlet of a combustion-supporting fan (12) is communicated with a combustion-supporting air pipeline (3), an air inlet of the combustion-supporting fan (12) is respectively communicated with a circulating flue gas pipeline (9) and an air pipeline (11), the circulating flue gas pipeline (9) is communicated with a tail flue (7) of the boiler, and the air pipeline (11) is communicated with the atmosphere.
2. The ultra-low nitrogen combustion system for low heating value gas of claim 1, wherein: the circulating flue gas pipeline (9) is provided with a regulating valve (10).
3. The ultra-low nitrogen combustion system for low heating value gas of claim 1, wherein: combustor (1) is including from interior to outer central gas spray tube (101), annular gas spray tube (102) and the combustor shell that sets up with one heart in proper order, interior overgrate air spout (202) are enclosed for interval setting and jointly to central gas spray tube (101) and annular gas spray tube (102), leave the clearance between annular gas spray tube (102) and the combustor shell and enclose into outer overgrate air spout (203).
4. The ultra-low nitrogen combustion system for low heating value gas of claim 3, wherein: the gas pipeline (2) is respectively communicated with the central gas spray pipe (101) and the annular gas spray pipe (102), and the combustion-supporting air pipeline (3) is respectively communicated with the inner secondary air nozzle (202) and the outer secondary air nozzle (203).
5. The ultra-low nitrogen combustion system for low heating value gas of claim 3, wherein: a central combustion stabilizing cylinder (201) is arranged in front of the central gas spray pipe (101), and the central combustion stabilizing cylinder (201) is communicated with a combustion-supporting air pipeline (3).
6. The ultra-low nitrogen combustion system for low heating value gas of claim 3, wherein: an ignition gun (301) is arranged in the central gas jet pipe (101).
7. The ultra-low nitrogen combustion system for low heating value gas of claim 3, wherein: along the gas spraying direction, the distance between the central gas spraying pipe (101) and the heat storage and combustion stabilization chamber (4), the distance between the inner overgrate air nozzle (202) and the heat storage and combustion stabilization chamber (4), the distance between the annular gas spraying pipe (102) and the heat storage and combustion stabilization chamber (4) and the distance between the outer overgrate air nozzle (203) and the heat storage and combustion stabilization chamber (4) are gradually reduced.
8. The ultra-low nitrogen combustion system for low heating value gas of claim 1, wherein: the diameter of the heat storage and combustion stabilization chamber (4) is 1.0m-4.0 m.
9. The ultra-low nitrogen combustion system for low heating value gas of claim 1, wherein: the length of the heat storage and combustion stabilization chamber (4) is 0.5m-2.0 m.
10. The ultra-low nitrogen combustion system for low heating value gas of claim 1, wherein: the inner surface of the heat storage and combustion stabilization chamber (4) is laid with refractory pouring materials.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173692A (en) * | 2019-05-29 | 2019-08-27 | 广东东实开能能源有限公司 | A kind of ultralow nitrogen combustion system for fuel gas with low heat value |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173692A (en) * | 2019-05-29 | 2019-08-27 | 广东东实开能能源有限公司 | A kind of ultralow nitrogen combustion system for fuel gas with low heat value |
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