CN116298070A - Double-stage flat flame combustion experiment device for detecting ammonia coal mixed combustion and use method thereof - Google Patents

Abstract

The invention discloses a two-stage flat flame combustion experimental device for detecting ammonia coal mixed combustion and a use method thereof, wherein in the pulverized coal injection process, pulverized coal is mixed with ammonia in a local reduction and volatile matter-rich environment very early, and the pulverized coal carries ammonia, nitrogen N and coal-ammonia mixture to undergo an environment from reduction to oxidation, so that the experimental device provided by the embodiment of the invention can be well simulated; in addition, in the test process, the flame form of the two-stage flat flame burner in the combustion process is observed by using the first cylinder, the smoke after the combustion of the two-stage flat flame burner is sampled through the sampling port on the first cylinder, the components in the sampled smoke are analyzed by using the smoke analyzer, and the particles sampled in each stage of sampling films are detected by using the impact type dust particle classifier ELPI. The experimental device provided by the embodiment of the invention can obtain the combustion mechanism and emission characteristic of the ammonia coal mixed combustion on the two-stage flat flame burner, and is used for clarifying the interaction between the ammonia coal mixed combustion.

Description

Double-stage flat flame combustion experiment device for detecting ammonia coal mixed combustion and use method thereof

Technical Field

The invention relates to the technical field of ammonia coal combustion tests, in particular to a two-stage flat flame combustion experimental device for detecting ammonia coal mixed combustion and a use method thereof.

Background

Under the dual-carbon background, how to strengthen clean and efficient utilization of coal is a problem to be solved urgently, and along with development of new energy, coal is used as a guarantee energy source, and a coal motor group needs to meet the requirements of safe, stable and efficient operation of a boiler under deep peak shaving. Based on the method, ammonia is used as a clean, carbon-free and high-energy-density fuel, and the mixed combustion of coal dust and ammonia gas is an effective way for promoting the more efficient, clean, low-carbon and flexible development of a coal motor unit, and is an effective measure for solving the stable combustion and burnout of a boiler under the condition of low-load combustion and promoting the organic fusion and complementary development of the coal motor unit and new energy. Therefore, an ammonia-coal mixed combustion experiment is carried out on the two-stage flat flame burner, the combustion mechanism and the emission characteristic of the ammonia-coal mixed combustion experiment are explored, and the method is very important for clarifying the interaction of the ammonia-coal mixed combustion.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a two-stage flat flame combustion experimental device for detecting the mixed combustion of ammonia and coal, so as to obtain the combustion mechanism and emission characteristics of the mixed combustion of the ammonia and the coal on a two-stage flat flame combustor, and the two-stage flat flame combustion experimental device is used for clarifying the interaction between the mixed combustion of the ammonia and the coal; the invention also discloses a use method of the two-stage flat flame combustion experimental device for detecting the mixed combustion of the ammonia and the coal, so as to obtain the combustion mechanism and the emission characteristic of the mixed combustion of the ammonia and the coal on the two-stage flat flame burner, and the method is used for clarifying the interaction between the mixed combustion of the ammonia and the coal.

The two-stage flat flame combustion experimental device for detecting the mixed combustion of ammonia and coal comprises a support frame, a two-stage flat flame combustor, a first cylinder body and a particulate matter trapping device, wherein the two-stage flat flame combustor is arranged on the support frame, the two-stage flat flame combustor is provided with a combustion plane, the combustion plane comprises a first area and a second area, the first area is arranged around the second area, a plurality of first air outlets and a plurality of second air outlets are arranged on the first area, a third air outlet, a plurality of fourth air outlets and a plurality of fifth air outlets are arranged on the second area, the two-stage flat flame combustor further comprises a first air inlet communicated with the first air outlet, a second air inlet communicated with the second air outlet, a third air inlet communicated with the third air outlet, a fourth air inlet communicated with the fourth air outlet and a fifth air inlet communicated with the fifth air outlet;

the first cylinder is made of transparent materials, one end of the first cylinder is connected with the two-stage flat flame burner, the combustion plane is arranged in the first cylinder, and a plurality of sampling ports which are arranged at intervals are arranged in the axial direction of the first cylinder;

the particle trapping device is communicated with the other end of the first cylinder, a multi-stage sampling membrane is arranged in the particle trapping device and used for collecting particles in combustion flue gas of the two-stage flat flame combustor.

In some embodiments, the plurality of sampling ports comprises a first portion and a second portion, the first portion being disposed more adjacent to the combustion plane than the second portion in an axial direction of the first barrel, each of the first portion and the second portion comprising the plurality of sampling ports therein;

the distance between any two adjacent sampling ports in the first part is smaller than the distance between any two adjacent sampling ports in the second part.

In some embodiments, a heat trace belt is also included that surrounds the particulate trap device, the heat trace belt being used to heat the sampling film to a temperature ranging from ℃ to ℃.

In some embodiments, the heating pipe further comprises a heating pipe, the heating pipe comprises an inner pipe and an outer pipe which are arranged at intervals in the inner-outer direction, a heating cavity is defined between the inner pipe and the outer pipe, a sixth air inlet and a sixth air outlet are formed in the inner pipe, the sixth air inlet is arranged in the first cylinder, and a first water inlet () and a first water outlet () which are communicated with the heating cavity are formed in the outer pipe.

In some embodiments, the dual-stage flat flame burner comprises a second barrel and a third barrel, wherein the second barrel is sleeved on the third barrel, the second barrel and the third barrel are arranged at intervals in the inner-outer direction, so that an annular cavity is defined between the second barrel and the third barrel, the second barrel is provided with a first port and a second port which are opposite along the axial direction of the second barrel, the third barrel is provided with a third port and a fourth port which are opposite along the axial direction of the third barrel, the first port is arranged closer to the third port in the axial direction of the second barrel relative to the fourth port, the first port is flush with the third port, the first zone is positioned between the second barrel and the third barrel, and the second zone is positioned in the third barrel.

In some embodiments, the outlets of the first, second, third, fourth, and fifth air outlets are circular outlets, the diameter of the circular outlets being d;

the inner diameter of the second cylinder is D1, the ratio of the inner diameter D2 of the third cylinder to the inner diameter D1 of the third cylinder is 12-18, and the ratio of the inner diameter D1 to the inner diameter D2 of the third cylinder is 1/7-1/5.

In some embodiments, the first air outlets and the second air outlets form a plurality of air outlet groups, the air outlet groups are arranged along a first direction, each air outlet group comprises the first air outlets and the second air outlets which are arranged along a second direction, and the first direction is perpendicular to the second direction.

In some embodiments, two second air outlets are disposed between two adjacent first air outlets in the air outlet group.

In some embodiments, the third air outlet is disposed coaxially with the third cylinder, and the plurality of fourth air outlets are disposed around the third air outlet.

The application method of the two-stage flat flame combustion experimental device for detecting the ammonia coal mixed combustion provided by the embodiment of the invention is based on the two-stage flat flame combustion experimental device for detecting the ammonia coal mixed combustion, which is described in any embodiment, and comprises the following steps:

before ignition, weighing the sampling film, recording weighing data, ensuring that ambient air flow is stable, the ambient temperature is constant, and discharging other gases in a pipeline;

introducing nitrogen and oxygen into the first air inlet, introducing carbon monoxide and methane into the second air inlet, and then igniting;

introducing ammonia into the third air inlet, introducing pulverized coal into the fourth air inlet, and introducing oxygen and nitrogen into the fifth air inlet;

observing the flame form of the double-stage flat flame burner in the combustion process, sampling the smoke after the double-stage flat flame burner through the sampling port, and analyzing the components in the sampled smoke by using a smoke molecularly instrument;

and (3) carrying out chemical analysis or specific gravity analysis on the smoke particles in the sampling films of each stage by using an impact type dust particle classifier ELPI so as to detect the change of elements, morphology and content in the smoke.

In the use process of the two-stage flat flame combustion experimental device for detecting the mixed combustion of ammonia and coal, oxygen and nitrogen are introduced into the first air inlet as combustion promoters and sprayed out through the plurality of second air outlets, carbon monoxide and methane are introduced into the second air inlet as fuel and are discharged through the plurality of second air outlets, and then ignition is carried out, so that the fuel is combusted on the first area under the action of the combustion promoters. And then ammonia gas is introduced into the third air inlet and is sprayed into the combustion plane through the third air outlet, coal powder is introduced into the fourth air inlet and is sprayed into the combustion plane through the fourth air outlet, and oxygen and nitrogen gas serving as combustion promoters of the ammonia gas and the coal powder are introduced into the fifth air inlet and are sprayed into the combustion plane through the fifth air outlet.

In the pulverized coal injection process, the pulverized coal is mixed with ammonia in the environment of local reduction and rich in volatile matters, and the pulverized coal carries ammonia, nitrogen N and a coal-ammonia mixture to undergo the environment from reduction to oxidation, so that the two-stage flat flame combustion experimental device for detecting the mixed combustion of the ammonia and the coal can be well simulated, and the experimental result accuracy of the interaction of the mixed combustion of the ammonia and the coal is higher.

In addition, in the combustion process of the two-stage flat flame burner, as the first cylinder is made of transparent materials, the flame form of the two-stage flat flame burner in the combustion process is observed by using the first cylinder, the smoke after the two-stage flat flame burner is combusted is sampled through the sampling port on the first cylinder, and the components in the sampled smoke are analyzed by using the smoke analyzer, so that the molecular components of the gas in the smoke after the ammonia coal mixed combustion are obtained. Particles sampled in each stage of sampling films are detected by an impact dust particle classifier ELPI to detect the changes of elements, morphology and content in the flue gas.

Therefore, the two-stage flat flame combustion experimental device for detecting the ammonia-coal mixed combustion can obtain the combustion mechanism and the emission characteristic of the ammonia-coal mixed combustion on the two-stage flat flame combustor, and is used for clarifying the interaction between the ammonia-coal mixed combustion.

Drawings

FIG. 1 is a schematic diagram of a two-stage flat flame combustion experimental device for detecting ammonia coal mixed combustion according to an embodiment of the invention.

FIG. 2 is a cross-sectional view of a dual-stage flat flame burner of a dual-stage flat flame combustion experimental apparatus for detecting ammonia coal co-combustion in accordance with an embodiment of the present invention.

FIG. 3 is a schematic diagram of a first barrel and a dual-stage flat flame burner of a dual-stage flat flame combustion experimental apparatus for detecting ammonia-coal co-combustion in accordance with an embodiment of the present invention.

FIG. 4 is a top view of a dual stage flat flame burner of a dual stage flat flame combustion experimental apparatus for detecting ammonia coal co-combustion in accordance with an embodiment of the present invention.

Reference numerals:

a two-stage flat flame combustion experiment device 100 for detecting the mixed combustion of ammonia and coal;

a support frame 1;

a two-stage flat flame burner 2; a combustion plane 201; a first zone 2011; a second zone 2012; a first air outlet 202; a second air outlet 203; a third air outlet 204; a fourth air outlet 205; a fifth outlet 206; a first air inlet 207; a second air inlet 208; a third air inlet 209; a fourth air inlet 210; a fifth air inlet 211; a second cylinder 212; a first port 2121; a second port 2122; a third cylinder 213; a third port 2131; a fourth port 2132; an annular cavity 214;

a first cylinder 3; sampling port 301; a first portion 302; a second portion 303;

a particulate matter trapping device 4;

a heat tracing belt 5;

a heating pipe 6; an inner tube 601; a sixth intake port 6011; a sixth outlet 6012; an outer tube 602; a first water inlet 6021; a first water outlet 6022; a heating chamber 603;

a first flow rate adjustment valve 701; a second flow regulating valve 702;

a first sealing plate 801; a second seal plate 802;

a water cooling device 9; a cooling chamber 901; a second water inlet 902; a second water outlet 903.

A filter 10.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

The technical solutions of the present application are described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, a dual-stage flat flame combustion experiment device 100 for detecting ammonia coal mixed combustion according to an embodiment of the present invention includes a support frame 1, a dual-stage flat flame burner 2, a first cylinder 3, and a particulate matter trapping device 4.

The two-stage flat flame burner 2 is arranged on the support frame 1, the two-stage flat flame burner 2 is provided with a combustion plane 201, the combustion plane 201 comprises a first area 2011 and a second area 2012, and the first area 2011 is arranged around the second area 2012. The first area 2011 is provided with a plurality of first air outlets 202 and a plurality of second air outlets 203, and the second area 2012 is provided with a third air outlet 204, a plurality of fourth air outlets 205 and a plurality of fifth air outlets 206. The dual stage flat flame burner 2 further comprises a first air inlet 207 in communication with the first air outlet 202, a second air inlet 208 in communication with the second air outlet 203, a third air inlet 209 in communication with the third air outlet 204, a fourth air inlet 210 in communication with the fourth air outlet 205, and a fifth air inlet 211 in communication with the fifth air outlet 206.

The first cylinder 3 is made of a transparent material, for example, glass. One end of the first cylinder 3 is connected with the two-stage flat flame burner 2, the combustion plane 201 is arranged in the first cylinder 3, and the first cylinder 3 is provided with a plurality of sampling ports 301 which are arranged at intervals in the axial direction of the first cylinder 3.

The particle trapping device 4 is communicated with the other end of the first cylinder 3, and a multi-stage sampling membrane is arranged in the particle trapping device 4 and used for collecting particles in the combustion flue gas of the two-stage flat flame combustor 2.

For example, as shown in fig. 4, the first zone 2011 is circular, the second zone 2012 is annular, the plurality of air outlets form the combustion plane 201 into a honeycomb shape, wherein the plurality of first air outlets 202 and the plurality of second air outlets 203 form the first zone 2011 into an outer honeycomb, and the third air outlets 204, the plurality of fourth air outlets 205 and the plurality of fifth air outlets 206 form the second zone 2012 into an inner honeycomb, thereby forming the inner and outer honeycomb into the dual stage flat flame burner 2.

Before the test, the pipeline of the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal is purged by compressed air, and whether the tightness of the pipeline is qualified is checked. When the pipeline is purged and the tightness is qualified, before ignition, the sampling films are weighed by an electronic balance, each level of sampling film is weighed twice, the data is an effective value when the error of the two times is within a reasonable range, and weighing data is recorded. And the ambient air flow is ensured to be stable in the weighing process, and the ambient temperature is constant, so that the ambient error is reduced. Simultaneously, the first air inlet 207, the second air inlet 208, the third air inlet 209, the fourth air inlet 210 and the fifth air inlet 211 are all filled with nitrogen so as to discharge other gases in the pipeline, and the other gases in the pipeline are prevented from interfering with the sampling of the sampling film, so that the accuracy of the detection result is affected.

Specifically, in the use process of the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal, oxygen and nitrogen are introduced into the first air inlet 207 as combustion promoters, carbon monoxide and methane are introduced into the second air inlet 208 as fuel, and then ignition is performed, so that the fuel is combusted on the outer honeycomb of the first zone 2011 under the action of the combustion promoters. Then, ammonia gas is introduced into the third air inlet 209 and is sprayed into the combustion plane 201 through the third air outlet 204, coal dust is introduced into the fourth air inlet 210 and is sprayed into the combustion plane 201 through the fourth air outlet 205, and oxygen and nitrogen gas are introduced into the fifth air inlet 211 as combustion promoters of the ammonia gas and the coal dust and are sprayed into the combustion plane 201 through the fifth air outlet 206.

It should be noted that, during the pulverized coal injection process, the pulverized coal is mixed with ammonia in the environment of partial reduction and rich in volatile matters very early, and the pulverized coal carries ammonia, nitrogen N and a coal-ammonia mixture from reduction to oxidation, so that the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal can be well simulated, and the accuracy of the experimental result of the interaction of the mixed combustion of ammonia and coal is higher.

In addition, in the combustion process of the two-stage flat flame burner 2, since the first cylinder 3 is made of transparent materials, the flame form of the two-stage flat flame burner 2 in the combustion process is observed by using the first cylinder 3, and the smoke after the two-stage flat flame burner 2 is combusted is sampled through the sampling port 301 on the first cylinder 3, and the components in the sampled smoke are analyzed by using the smoke analyzer, so that the molecular components of the gas in the smoke after the ammonia coal is mixed and combusted are obtained. Particles sampled in each stage of sampling films are detected by an impact dust particle classifier ELPI to detect the changes of elements, morphology and content in the flue gas.

Therefore, in the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal, the form of the combustion flame of the ammonia and coal on the two-stage flat flame combustor 2 is observed through the first cylinder 3, the components of gas molecules in the smoke after the combustion of the ammonia and coal are detected through the sampling port 301, and the chemical analysis or the specific gravity analysis of the particles in the smoke is performed through the particle capturing device 4, so that the combustion mechanism and the emission characteristic of the ammonia and coal on the two-stage flat flame combustor 2 can be explored, and the interaction of the mixed combustion of the ammonia and the coal can be clarified.

Therefore, the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal according to the embodiment of the invention can obtain the combustion mechanism and the emission characteristic of the mixed combustion of ammonia and coal on the two-stage flat flame burner 2, and is used for clarifying the interaction between the mixed combustion of ammonia and coal.

In some embodiments, the plurality of sampling ports 301 comprises a first portion 302 and a second portion 303, the first portion 302 being disposed closer to the combustion plane 201 than the second portion 303 in the axial direction of the first barrel 3, the first portion 302 and the second portion 303 each comprising a plurality of sampling ports 301 therein, wherein the spacing between any adjacent two sampling ports 301 in the first portion 302 is less than the spacing between any adjacent two sampling ports 301 in the second portion 303.

For example, as shown in fig. 4, the first portion 302 includes a plurality of sampling ports 301 arranged at uniform intervals, and the second portion 303 includes sampling ports 301 arranged at three uniform intervals. It will be appreciated that since the second portion 303 is disposed further from the combustion plane 201 than the first portion 302, in the first barrel 3, the smoke content at the second portion 303 is lower than that at the position of the first portion 302, and by making the interval between any two adjacent sampling ports 301 in the first portion 302 smaller than that between any two adjacent sampling ports 301 in the second portion 303, a plurality of samples can be sampled at the position where the smoke content is high, and a small number of samples can be sampled at the position where the smoke content is low, so that the sampling ports 301 are distributed reasonably, which is beneficial to improving the sampling efficiency.

In some embodiments, the two-stage flat flame combustion experimental device 100 for detecting ammonia coal mixed combustion further comprises a heat tracing belt 5, the heat tracing belt 5 surrounds the particulate matter trapping device 4, the heat tracing belt 5 is used for heating the sampling film to 100-110 ℃, inaccuracy of sampling components on the sampling film caused by condensation of water vapor on the sampling film in the experimental process can be effectively prevented, and further improvement of the working reliability of the experimental device is facilitated.

In some embodiments, the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal according to the embodiment of the invention further comprises a heating pipe 6, wherein the heating pipe 6 comprises an inner pipe 601 and an outer pipe 602 which are arranged at intervals in the inner-outer direction, and a heating cavity 603 is defined between the inner pipe 601 and the outer pipe 602. The inner pipe 601 is provided with a sixth air inlet 6011 and a sixth air outlet 6012, the sixth air inlet 6011 is arranged in the first cylinder 3, and the outer pipe 602 is provided with a first water inlet 6021 and a first water outlet 6022 which are communicated with the heating cavity 603.

For example, as shown in fig. 1, in the use process, circulating water is first introduced into the heating cavity 603 through the second water inlet 902, the water in the heating cavity 603 is heated to boiling by the heat of the combustion of the dual-stage flat flame burner 2, and then is discharged through the second water outlet 903, so that the water in the heating cavity 603 is always in a boiling state. The circulation water flow rate is adjusted according to the boiling degree of the water in the heating chamber 603, and the greater the boiling degree is, the greater the circulation water flow rate is. When the flue gas after the combustion of the two-stage flat flame burner 2 enters the inner tube 601 through the fourth air inlet 210, the boiling water in the heating cavity 603 heats the flue gas flowing through the inner tube 601, so that the condensation of the flue gas can be effectively prevented from influencing the component content of the flue gas, and the accuracy of the test result of the two-stage flat flame combustion experimental device 100 for detecting the ammonia-coal mixed combustion is improved.

Optionally, the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal according to the embodiment of the invention further comprises a filter 10, wherein the filter 10 is arranged between the heating pipe 6 and the particulate matter trapping device 4, and the flue gas exhausted by the heating pipe 6 enters the particulate matter trapping device 4 after being filtered by the filter 10. It can be understood that the particles sampled by the sampling film are generally nano-sized, and the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal in the embodiment of the invention can effectively filter out large particle products in the flue gas discharged from the fourth air outlet 205 by arranging the filter 10 so as to avoid influencing the size of the particles sampled by the sampling film in the test and affecting the accuracy of the detection result.

Alternatively, the particulate matter trapping device 4 is an impact dust particle sizer ELPI, and the sampling film is an ELPI film.

In some embodiments, the dual stage flat flame burner 2 includes a second barrel 212 and a third barrel 213, the second barrel 212 being sleeved on the third barrel 213, the second barrel 212 being spaced apart from the third barrel 213 in an inner-outer direction so as to define an annular cavity 214 between the second barrel 212 and the third barrel 213. The second barrel 212 has first and second axially opposed ports 2121 and 2122, the third barrel 213 has third and fourth axially opposed ports 2131 and 2132, the first port 2121 is disposed axially further adjacent to the third port 2131 than the fourth port 2132 of the second barrel 212, the first port 2121 is flush with the third port 2131, the first zone 2011 is located between the second and third barrels 212 and 213, and the second zone 2012 is located within the third barrel 213.

For example, as shown in fig. 2 and 3, a first steel pipe and a second steel pipe are provided in the annular cavity 214, one end of the first steel pipe is communicated with the first air inlet 207, the other end of the first steel pipe forms the first air outlet 202, one end of the second steel pipe is communicated with the second air inlet 208, and the other end of the second steel pipe forms the second air outlet 203. A third steel pipe, a fourth steel pipe and a fifth steel pipe are arranged in the second cylinder 212, one end of the third steel pipe is communicated with the third air inlet 209, the other end of the third steel pipe forms a third air outlet 204, one end of the fourth steel pipe is communicated with the fourth air inlet 210, the other end of the fourth steel pipe forms a fifth air outlet 206, one end of the fifth steel pipe is communicated with the fifth air inlet 211, and the other end of the fifth steel pipe forms a fifth air outlet 206.

Therefore, the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal, provided by the embodiment of the invention, divides the combustion plane 201 into the first zone 2011 and the second zone 2012 by arranging the second cylinder 212 and the third cylinder 213, so that the structure is simple.

In some embodiments, the outlets of the first air outlet 202, the second air outlet 203, the third air outlet 204, the fourth air outlet 205 and the fifth air outlet 206 are all circular outlets, the diameter of the circular outlets is D, wherein the inner diameter of the second cylinder 212 is D1, the ratio between the inner diameters D2, D1 and D2 of the third cylinder 213 is 12-18, and the ratio between D and D2 is 1/7-1/5.

For example, the ratio between D1 and D2 is 15, the ratio between D and D2 is 1/6, D1 is 80mm, D2 is 6mm, and D is 1mm. The two-stage flat flame combustion experimental device 100 for detecting the ammonia coal mixed combustion provided by the embodiment of the invention is reasonable in structural design by reasonably arranging the ratio between D1 and D2 and the ratio between D and D2.

In some embodiments, the plurality of first air outlets 202 and the plurality of second air outlets 203 form a plurality of air outlet groups, the plurality of air outlet groups being arranged along a first direction, each air outlet group including the plurality of first air outlets 202 and the plurality of second air outlets 203 arranged along a second direction, the first direction being perpendicular to the second direction.

For example, as shown in fig. 3, the dual-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal according to the embodiment of the invention forms a plurality of air outlet groups by forming a plurality of first air outlets 202 and a plurality of second air outlets 203, the plurality of air outlet groups being arranged along a first direction, each air outlet group including the plurality of first air outlets 202 and the plurality of second air outlets 203 arranged along a second direction. The first air outlet 202 and the second air outlet 203 are arranged in the first direction and the second direction, so that the first air outlet 202 and the second air outlet 203 are uniformly distributed in the annular cavity 214, and further, the combustion improver sprayed out of the first air outlet 202 and the fuel sprayed out of the second air outlet 203 are uniformly distributed on the combustion plane 201, thereby being beneficial to fully burning ammonia coal on the combustion plane 201, and further being beneficial to improving the test accuracy of the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of the ammonia coal.

In some embodiments, two second air outlets 203 are disposed between two adjacent first air outlets 202 in the air outlet group.

That is, the first air outlet 202 and the second air outlet 203 are inserted into the outer honeycomb at a pipe hole ratio of 1:2 in the first direction, so that the injection range of the combustion improver sprayed from the first air outlet 202 and the injection range of the fuel sprayed from the second air outlet 203 are reasonably arranged, which is beneficial to fully combining and burning the fuel and the combustion improver on the burning plane 201, thereby further improving the test accuracy of the two-stage flat flame burning test device 100 for detecting the ammonia-coal mixed burning in the embodiment of the invention.

In some embodiments, the third air outlet 204 is disposed coaxially with the third barrel 213 and a plurality of fourth air outlets 205 are disposed around the third air outlet 204.

For example, as shown in fig. 2, the third air outlet 204 is used for introducing ammonia gas, the fourth air outlet 205 is used for introducing coal powder, and the plurality of fourth air outlets 205 are arranged around the third air outlet 204, so that the plurality of fourth air outlets 205 can surround the third air outlet 204, so that coal powder sprayed out of the plurality of fourth air outlets 205 forms a barrier, the ammonia gas sprayed out of the third air outlet 204 is isolated from combustion flame in the outer honeycomb area, the ammonia gas and the combustion flame in the outer honeycomb area are prevented from being burnt in a contact manner too early, and then the ammonia-coal mixture is subjected to an environment from reduction to oxidation, and further, the ammonia-coal mixed combustion can be well simulated on the two-stage flat flame combustion experimental device 100 for detecting the ammonia-coal mixed combustion, which is further beneficial to improving the accuracy of experimental results.

Optionally, the water cooling device 9 of the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal according to the embodiment of the invention is arranged on the second cylinder 212 and is adjacent to the first port 2121, and the cooling device 9 is provided with a cooling chamber 901, and a second water inlet 902 and a second water outlet 903 which are communicated with the cooling chamber 901.

For example, as shown in fig. 1 and 3, the water cooling device 9 is disposed at one end of the second cylinder 212 near the combustion plane 201, the water cooling device 9 is disposed around the second cylinder 212, and in the test process, circulating water can enter the cooling chamber 901 through the second water inlet 902 to exchange heat with the second cylinder 212 and then be discharged through the second water outlet 903, so as to cool the dual-stage flat flame burner 2. It can be understood that, because the temperature of the two-stage flat flame combustion experimental device 100 for detecting the ammonia-coal mixed combustion in the combustion process can reach 1200 ℃, the two-stage flat flame combustion experimental device 2 can be effectively prevented from being damaged due to overhigh temperature by arranging the water cooling device 9, and the working reliability of the two-stage flat flame combustion experimental device 100 for detecting the ammonia-coal mixed combustion in the embodiment of the invention is improved.

Optionally, the second port 2122 is offset from the fourth port 2132 in the axial direction of the second barrel 212, and the fourth port 2132 is located outside of the second barrel 212. The two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal in the embodiment of the invention further comprises a first sealing plate 801 and a second sealing plate 802, wherein the first sealing plate 801 seals the second port 2122, and the second cylinder 212 is inserted on the first sealing plate 801. The second sealing plate 802 seals the fourth port 2132, the third cylinder 2132 is inserted on the second sealing plate 802, and the fourth port 2132 is disposed outside the second cylinder 212.

As shown in fig. 3, the third cylinder 213 may be mounted on the first sealing plate 801 by flange connection or welding connection, so that the structure between the second cylinder 212 and the third cylinder 213 is simple and the connection is convenient. The third steel pipe may be mounted on the second sealing plate 802 through flange connection or welded connection, so that the structure between the third steel pipe and the third cylinder 213 is simple, and the connection is convenient.

Optionally, the second cylinder 212 is provided with a first air inlet pipe and a second air inlet pipe, the plurality of first air outlets 202 are all communicated with the first air inlet pipe, the plurality of second air outlets 203 are all communicated with the second air inlet pipe, an inlet end of the first air inlet pipe forms a first air inlet 207, and an inlet end of the second air inlet pipe forms a second air inlet 208. The third cylinder 213 is provided with a fourth air inlet pipe and a fifth air inlet pipe, the plurality of fourth air outlets 205 are all communicated with the third air inlet pipe, the plurality of fifth air outlets 206 are all communicated with the fifth air inlet pipe, the inlet end of the fourth air inlet pipe forms a fourth air inlet, and the inlet end of the fifth air inlet pipe forms a fifth air inlet.

For example, as shown in fig. 1 and 3, the number of the first air inlet pipes is two, the two first air inlet pipes are disposed opposite to each other, a part of the first air outlet 202 is connected to one first air inlet pipe, and another part of the first air outlet 202 is connected to the other first air inlet pipe. The number of the second air inlet pipes is two, the two second air inlet pipes are oppositely arranged, one part of the second air outlet 203 is connected with one second air inlet pipe, and the other part of the second air outlet 203 is connected with the other second air inlet pipe. The two third air inlet pipes are oppositely arranged, one part of the fourth air outlet 205 is connected with one third air inlet pipe, and the other part of the fourth air outlet 205 is connected with the other third air inlet pipe. The two fourth air inlet pipes are arranged oppositely, one part of the fifth air outlet 206 is connected with one fourth air inlet pipe, and the other part of the fifth air outlet 206 is connected with the other fourth air inlet pipe.

Therefore, the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal in the embodiment of the invention is provided with the first air inlet pipe, the second air inlet pipe, the third air inlet pipe and the fourth air inlet pipe, so that the feeding to the first air outlets 202, the second air outlets 203, the fourth air outlets 205 and the fifth air outlets 206 is convenient, and the structure is simple, and the operation is convenient.

Optionally, a first flow regulating valve 701 is arranged on the first air inlet pipe, and a second flow regulating valve 702 is arranged on the second air inlet pipe.

According to the two-stage flat flame combustion experimental device 100 for detecting ammonia-coal mixed combustion, the flow of oxygen and nitrogen entering through the first air inlet pipe is regulated through regulating the first flow regulating valve 701, and the flow of carbon monoxide and methane entering through the second air inlet pipe is regulated through regulating the second flow regulating valve 702, so that the temperature, the oxygen duty ratio and the gas speed of combustion flame can be respectively controlled, and the two-stage flat flame combustion experimental device 100 for detecting ammonia-coal mixed combustion can simulate different combustion working conditions to perform experiments, thereby being further beneficial to improving the accuracy of test results.

The use method of the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal according to the embodiment of the invention is based on the two-stage flat flame combustion experimental device 100 for detecting the mixed combustion of ammonia and coal described in any one of the embodiments, and comprises the following steps:

before ignition, weighing the sampling film, recording weighing data, ensuring that ambient air flow is stable, the ambient temperature is constant in the weighing process, and discharging other gases in a pipeline;

nitrogen and oxygen are introduced into the first gas inlet 207, carbon monoxide and methane are introduced into the second gas inlet 208, and ignition is performed;

ammonia gas is introduced into the third air inlet 209, pulverized coal is introduced into the fourth air inlet 210, and oxygen and nitrogen gas are introduced into the fifth air inlet 211;

observing the flame form of the double-stage flat flame burner 2 in the combustion process, sampling the smoke after the double-stage flat flame burner 2 through a sampling port 301, and analyzing the components in the sampled smoke by using a smoke molecularly;

and (3) carrying out chemical analysis or specific gravity analysis on the smoke particles in each stage of sampling films by using an impact type dust particle classifier ELPI so as to detect the change of elements, morphology and content in the smoke.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.

Claims (10)

1. A doublestage flat flame burning experimental apparatus for detecting ammonia coal mixed combustion, characterized by comprising:

a support (1);

a two-stage flat flame burner (2), the two-stage flat flame burner (2) is arranged on the supporting frame (1), the two-stage flat flame burner (2) is provided with a combustion plane (201), the combustion plane (201) comprises a first area (2011) and a second area (2012), the first area (2011) is arranged around the second area (2012), a plurality of first air outlets (202) and a plurality of second air outlets (203) are arranged on the first area (2011), a third air outlet (204), a plurality of fourth air outlets (205) and a plurality of fifth air outlets (206) are arranged on the second area (2012), and the two-stage flat flame burner (2) further comprises a first air inlet (207) communicated with the first air outlet (202), a second air inlet (208) communicated with the second air outlet (203), a third air inlet (209) communicated with the third air outlet (204), a fourth air inlet (210) communicated with the fourth air outlet (205) and a fifth air inlet (211) communicated with the fifth air inlet (206);

the first cylinder body (3), the first cylinder body (3) is made of transparent materials, one end of the first cylinder body (3) is connected with the two-stage flat flame burner (2), the combustion plane (201) is arranged in the first cylinder body (3), and a plurality of sampling ports (301) which are arranged at intervals are arranged on the first cylinder body (3) in the axial direction; and

the particle trapping device (4), particle trapping device (4) with the other end intercommunication of first barrel (3), be equipped with multistage sampling membrane in particle trapping device (4), the sampling membrane is used for gathering the particulate matter in doublestage flat flame combustor (2) burning flue gas.

2. The two-stage flat flame combustion experimental device for detecting the mixed combustion of ammonia and coal according to claim 1, wherein a plurality of the sampling ports (301) comprise a first portion (302) and a second portion (303), the first portion (302) being disposed in a position closer to the combustion plane (201) than the second portion (303) in an axial direction of the first cylinder (3), and the first portion (302) and the second portion (303) each comprise a plurality of the sampling ports (301);

wherein the spacing between any two adjacent sampling ports (301) in the first portion (302) is smaller than the spacing between any two adjacent sampling ports (301) in the second portion (303).

3. The two-stage flat flame combustion experiment device for detecting ammonia coal mixed combustion according to claim 1, further comprising a heat tracing band (5), wherein the heat tracing band (5) surrounds the particulate matter trapping device (4), and the heat tracing band (5) is used for heating the sampling film to 100-110 ℃.

4. The two-stage flat flame combustion experimental device for detecting ammonia coal mixed combustion according to claim 1, further comprising a heating pipe (6), wherein the heating pipe (6) comprises an inner pipe (601) and an outer pipe (602) which are arranged at intervals in the inner-outer direction, a heating cavity (603) is defined between the inner pipe (601) and the outer pipe (602), a sixth air inlet (6011) and a sixth air outlet (6012) are formed in the inner pipe (601), the sixth air inlet (6011) is arranged in the first cylinder (3), and a first water inlet (6021) and a first water outlet (6022) which are communicated with the heating cavity (603) are formed in the outer pipe (602).

5. The dual stage flat flame combustion experimental device for detecting the co-combustion of ammonia and coal according to any of claims 1-4, characterized in that the dual stage flat flame burner (2) comprises a second barrel (212) and a third barrel (213), the second barrel (212) being sleeved on the third barrel (213), the second barrel (212) being spaced in an inner and outer direction from the third barrel (213) such that an annular cavity (214) is defined between the second barrel (212) and the third barrel (213), the second barrel (212) having a first port (2121) and a second port (2122) opposite along its axial direction, the third barrel (213) having a third port (2131) and a fourth port (2132) opposite along its axial direction, the first port (2121) being arranged closer to the third port (2131) than the fourth port (2132) in the axial direction of the second barrel (212), the first port (2121) being flush with the third barrel (213) and the third barrel (2011) being located in the third zone (2011).

6. The two-stage flat flame combustion experiment device for detecting ammonia coal mixed combustion according to claim 5, wherein the outlets of the first air outlet (202), the second air outlet (203), the third air outlet (204), the fourth air outlet (205) and the fifth air outlet (206) are all circular outlets, and the diameter of the circular outlets is d;

the inner diameter of the second cylinder (212) is D1, the ratio of the inner diameter D2 of the third cylinder (213) to the inner diameter D1 is 12-18, and the ratio of D to D2 is 1/7-1/5.

7. The dual stage flat flame combustion experiment device for detecting ammonia coal co-combustion according to claim 6, wherein a plurality of the first air outlets (202) and a plurality of the second air outlets (203) form a plurality of air outlet groups, the plurality of air outlet groups are arranged along a first direction, each of the air outlet groups comprises a plurality of the first air outlets (202) and a plurality of the second air outlets (203) arranged along a second direction, and the first direction is perpendicular to the second direction.

8. The two-stage flat flame combustion experiment device for detecting ammonia coal mixed combustion according to claim 7, wherein two second air outlets (203) are arranged between two adjacent first air outlets (202) in the air outlet group.

9. The two-stage flat flame combustion experiment device for detecting ammonia coal mixed combustion according to claim 5, wherein the third air outlet (204) is coaxially arranged with the third cylinder (213), and a plurality of the fourth air outlets (205) are arranged around the third air outlet (204).

10. A method of using a two-stage flat flame combustion experimental device for detecting ammonia-coal co-combustion, the method being based on the two-stage flat flame combustion experimental device for detecting ammonia-coal co-combustion of any one of claims 1-9, comprising:

before ignition, weighing the sampling film, recording weighing data, ensuring that ambient air flow is stable, the ambient temperature is constant, and discharging other gases in a pipeline;

introducing nitrogen and oxygen into the first gas inlet (207), introducing carbon monoxide and methane into the second gas inlet (208), and then igniting;

introducing ammonia into the third air inlet (209), introducing pulverized coal into the fourth air inlet (210), and introducing oxygen and nitrogen into the fifth air inlet (211);

observing the flame form of the double-stage flat flame burner (2) in the combustion process, sampling the smoke after the double-stage flat flame burner (2) through the sampling port (301), and analyzing the components in the sampled smoke by using a smoke molecularly;

and (3) carrying out chemical analysis or specific gravity analysis on the smoke particles in the sampling films of each stage by using an impact type dust particle classifier ELPI so as to detect the change of elements, morphology and content in the smoke.

Images