CN117871589A - Method for measuring ignition point of pulverized coal injection under different oxygen content conditions - Google Patents
Method for measuring ignition point of pulverized coal injection under different oxygen content conditions Download PDFInfo
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- CN117871589A CN117871589A CN202311742070.XA CN202311742070A CN117871589A CN 117871589 A CN117871589 A CN 117871589A CN 202311742070 A CN202311742070 A CN 202311742070A CN 117871589 A CN117871589 A CN 117871589A
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- pulverized coal
- container
- ignition point
- oxygen
- ignition
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- 239000001301 oxygen Substances 0.000 title claims abstract description 59
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 59
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000003245 coal Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002347 injection Methods 0.000 title claims abstract description 13
- 239000007924 injection Substances 0.000 title claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011521 glass Substances 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 238000009423 ventilation Methods 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000010998 test method Methods 0.000 claims abstract description 7
- 150000002926 oxygen Chemical class 0.000 claims abstract description 4
- 230000008859 change Effects 0.000 claims abstract description 3
- 238000005273 aeration Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002802 bituminous coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a method for measuring ignition points of pulverized coal injection under different oxygen content conditions, which comprises the following steps: taking a container, and inserting two glass tubes into a rubber plug of an opening of the container; two glass tubes are respectively connected with an oxygen cylinder and a nitrogen cylinder by hoses, and flow meters are arranged at the outlets of the oxygen cylinder and the nitrogen cylinder to control the gas flow; one end of the hose with the spring clip is connected with the ventilation mouth of the container, and the other end of the hose is connected with the ventilation pipe of the test equipment for measuring the ignition point temperature; controlling the flow of oxygen and nitrogen; according to a normal pulverized coal ignition point test program; continuing to perform according to the test procedure, wherein the measured ignition temperature is the ignition temperature under a certain oxygen content; then continuously measuring the ignition point temperature of the pulverized coal with a series of oxygen concentrations by controlling the flow rates of the two gases to continuously change the gas concentrations. The invention can determine the ignition point of the pulverized coal when different oxygen contents are obtained, and find out the proper oxygen content of the safely-sprayed mixed pulverized coal with different proportions.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for measuring ignition points of pulverized coal injection under different oxygen content conditions.
Background
The ignition points of different coal types are different, and the ignition point of anthracite is high, and the ignition point of bituminous coal is low. However, the ignition temperature of the pulverized coal is affected by different oxygen concentrations in the surrounding environment, and the requirements of different use conditions are different.
The same pulverized coal has a large difference in ignition points under different oxygen concentration conditions, and pulverized coal with high ignition points under general conditions can burn at a temperature lower than the normal ignition point under the condition of higher oxygen content, so that the probability of occurrence is higher as the oxygen content is higher, and the pulverized coal which can be normally used originally becomes unsafe due to the reduction of the ignition point. For example, in the pulverized coal conveying process, the oxygen content is required to be lower than a certain value to ensure the safe conveying of the pulverized coal with low ignition temperature, and if the oxygen concentration is increased due to some reasons, the pulverized coal can be burnt to cause accidents after the oxygen concentration reaches a certain value. In the pulverized coal injection combustion process, the coal which is difficult to burn is expected to burn in advance, so that the combustion is more complete, and the coal with high ignition point is required to burn better by increasing the oxygen content to reduce the ignition temperature. Therefore, ignition point tests under different oxygen content conditions need to be carried out on the used coal, so that the proper oxygen content is found out, and safe production and better use are realized.
It is therefore important to find a suitable oxygen content by laboratory tests.
Disclosure of Invention
The invention aims to provide a method for measuring the ignition point of pulverized coal injected under different oxygen content conditions, which is used for measuring the ignition point of pulverized coal under different oxygen content conditions and finding out the proper oxygen content of safely injecting mixed pulverized coal with different proportions.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for measuring ignition points of pulverized coal injection under different oxygen content conditions, which comprises the following steps:
2) Taking a container with proper capacity, wherein the container comprises an aeration nozzle besides a container opening, the container opening is plugged by a rubber plug, two small holes are formed in the container opening, two glass tubes with the thickness of 2-4mm are inserted, and the two glass tubes are deeply positioned at a position 1-3cm away from the bottom of the container;
2) Two glass tubes are respectively connected with an oxygen cylinder and a nitrogen cylinder through hoses, and flow meters are arranged at the outlets of the oxygen cylinder and the nitrogen cylinder to control the gas flow;
3) Then a hose is used, a spring clip is arranged on the hose, one end of the spring clip is connected with a ventilation nozzle of the container, and the other end of the spring clip is connected with a ventilation pipe of the test equipment for measuring the ignition point temperature;
4) Controlling the flow of oxygen and nitrogen according to the result of the calculation of the oxygen concentration required by the experiment, and fully and uniformly mixing in a container;
5) Starting to perform a normal pulverized coal ignition point test procedure, opening a spring clamp on an air tap hose when ventilation is required, and introducing mixed gas into ignition point test equipment to keep a certain flow;
6) Continuing according to the test procedure, wherein the measured ignition temperature is the ignition temperature under a certain oxygen content;
7) And then continuously measuring the ignition point temperature of the pulverized coal with a series of oxygen concentrations by controlling the flow rates of the two gases to continuously change the gas concentrations.
Further, in the step 1), the thickness of the glass tube is 3mm.
Further, in the step 1), two glass tubes are extended to a position 2cm away from the bottom of the container.
Further, in the step 1), the thickness of the glass tube is 2mm.
Further, in the step 1), two glass tubes are extended to a position 1.5cm away from the bottom of the container.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention has the advantages that the proper oxygen concentration can be found for different coal types, and a proper oxygen concentration scheme is provided according to different requirements during use. Can ensure safe production and also can improve production efficiency.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a schematic illustration of the method for determining the ignition point of pulverized coal injection under different oxygen contents according to the present invention.
Detailed Description
As shown in FIG. 1, the method for measuring the ignition point of the pulverized coal injection under the condition of different oxygen contents comprises the following steps:
1. taking a container with proper capacity, wherein the container needs to be provided with an aeration nozzle besides a container opening, the container opening is plugged by a rubber plug, two small holes are formed in the aeration nozzle, 2 glass tubes with the thickness of about 3mm are inserted into the aeration nozzle, and the 2 glass tubes are deeply positioned at a position about 2cm away from the bottom of the container.
2. Two glass tubes are respectively connected with an oxygen cylinder and a nitrogen cylinder by hoses, and flow meters are arranged at the outlets of the oxygen cylinder and the nitrogen cylinder to control the gas flow.
3. And a flexible pipe is used, a spring clamp is arranged on the flexible pipe, and one end of the spring clamp is connected with the air outlet nozzle of the container. The other end is connected with a vent pipe of the test equipment for measuring the ignition temperature.
4. And controlling the flow of oxygen and nitrogen according to the result of the calculation of the oxygen concentration required by the experiment, and fully and uniformly mixing in a container.
5. And starting to perform the normal pulverized coal ignition point test procedure. When ventilation is needed, the spring clamp on the air outlet nozzle hose is opened, and the mixed gas is introduced into the ignition point testing equipment to keep a certain flow.
6. The test procedure was continued, and the measured ignition temperature at this time was the ignition temperature at a certain oxygen content.
7. The gas concentration can be continuously changed by controlling the flow rates of the two gases, so as to continuously measure the ignition point temperature of the pulverized coal with a series of oxygen concentrations.
The invention is further described below with reference to examples.
Example 1
Ignition results of 100% bituminous coal tested at oxygen concentration of 11% -21%
| Oxygen concentration% | 21 | 14 | 12 |
| Ignition point of coal powder | 310 | 350 | 370 |
In example 1, the pulverized coal was ignited at 310 ℃ under the condition of 21% oxygen content, and when the oxygen content of the surrounding environment was reduced to 14%, the ignition temperature of the pulverized coal was increased to 350 ℃ and further reduced to 12% oxygen content, and the ignition temperature was increased to 370 ℃.
With the continuous decrease of the oxygen content, the ignition point of the same pulverized coal is continuously increased.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (5)
1. A method for measuring ignition points of pulverized coal injection under different oxygen content conditions is characterized by comprising the following steps: the method comprises the following steps:
1) Taking a container with proper capacity, wherein the container comprises an aeration nozzle besides a container opening, the container opening is plugged by a rubber plug, two small holes are formed in the container opening, two glass tubes with the thickness of 2-4mm are inserted, and the two glass tubes are deeply positioned at a position 1-3cm away from the bottom of the container;
2) Two glass tubes are respectively connected with an oxygen cylinder and a nitrogen cylinder through hoses, and flow meters are arranged at the outlets of the oxygen cylinder and the nitrogen cylinder to control the gas flow;
3) Then a hose is used, a spring clip is arranged on the hose, one end of the spring clip is connected with a ventilation nozzle of the container, and the other end of the spring clip is connected with a ventilation pipe of the test equipment for measuring the ignition point temperature;
4) Controlling the flow of oxygen and nitrogen according to the result of the calculation of the oxygen concentration required by the experiment, and fully and uniformly mixing in a container;
5) Starting to perform a normal pulverized coal ignition point test procedure, opening a spring clamp on an air tap hose when ventilation is required, and introducing mixed gas into ignition point test equipment to keep a certain flow;
6) Continuing according to the test procedure, wherein the measured ignition temperature is the ignition temperature under a certain oxygen content;
7) And then continuously measuring the ignition point temperature of the pulverized coal with a series of oxygen concentrations by controlling the flow rates of the two gases to continuously change the gas concentrations.
2. The method for determining the ignition point of pulverized coal injection under the condition of different oxygen contents according to claim 1, wherein the method comprises the following steps: in the step 1), the thickness of the glass tube is 3mm.
3. The method for determining the ignition point of pulverized coal injection under the condition of different oxygen contents according to claim 1, wherein the method comprises the following steps: in the step 1), two glass tubes extend deep into the container at a distance of 2cm from the bottom of the container.
4. The method for determining the ignition point of pulverized coal injection under the condition of different oxygen contents according to claim 1, wherein the method comprises the following steps: in the step 1), the thickness of the glass tube is 2mm.
5. The method for determining the ignition point of pulverized coal injection under the condition of different oxygen contents according to claim 1, wherein the method comprises the following steps: in the step 1), two glass tubes extend deep 1.5cm away from the bottom of the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311742070.XA CN117871589A (en) | 2023-12-18 | 2023-12-18 | Method for measuring ignition point of pulverized coal injection under different oxygen content conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311742070.XA CN117871589A (en) | 2023-12-18 | 2023-12-18 | Method for measuring ignition point of pulverized coal injection under different oxygen content conditions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117871589A true CN117871589A (en) | 2024-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311742070.XA Pending CN117871589A (en) | 2023-12-18 | 2023-12-18 | Method for measuring ignition point of pulverized coal injection under different oxygen content conditions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117871589A (en) |
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2023
- 2023-12-18 CN CN202311742070.XA patent/CN117871589A/en active Pending
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