CN114632613A - Hot-blast and cold wind mixed connection system of medium speed pulverizer entry - Google Patents
Hot-blast and cold wind mixed connection system of medium speed pulverizer entry Download PDFInfo
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- CN114632613A CN114632613A CN202210201579.2A CN202210201579A CN114632613A CN 114632613 A CN114632613 A CN 114632613A CN 202210201579 A CN202210201579 A CN 202210201579A CN 114632613 A CN114632613 A CN 114632613A
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- air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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- Disintegrating Or Milling (AREA)
Abstract
The invention relates to the technical field of coal mills, and particularly discloses a hot air and cold air mixed connection system for an inlet of a medium-speed coal mill, which comprises a hot air pipe, a cold air pipe and a drainage component, wherein the drainage component is arranged in the hot air pipe, one end of the drainage component is communicated with the cold air pipe, the axis of one end, far away from the cold air pipe, of the drainage component is parallel to the flow direction of hot air in the hot air pipe, and one end, far away from the cold air pipe, of the drainage component is arranged on one side, close to the air outlet end of the hot air pipe. The invention can effectively avoid the blockage of cold air with higher pressure head to the hot air, greatly improve the flow field of the mixed section of the hot air and the cold air, and simultaneously improve the uniformity of a speed field and a temperature field, thereby improving the measurement condition and the accuracy of air volume measurement, realizing linear response of the mixed air volume flow and the opening degree of an air door, and ensuring the automatic operation of the coal mill.
Description
Technical Field
The invention relates to the technical field of coal mills, in particular to a hot air and cold air mixed connection system at an inlet of a medium-speed coal mill.
Background
When the coal-fired unit is provided with the medium-speed coal mill, the air duct at the inlet of the coal mill is very compact in arrangement, the requirement of the air volume measuring device on the length of the straight pipe section cannot be met usually, and great difficulty is caused to the measurement of the ventilation volume of the coal mill.
As shown in fig. 4, in the case of the common arrangement of the coal mill inlet air ducts, the air doors arranged in a short distance, the mixture of cold air and hot air, the bent pipe with a small curvature radius, the variable diameter in a large range, and the like make it difficult to arrange the air volume measuring device according to the straight section requirement, and the air volume measuring device can only measure in the severe measuring environment with disordered flow field and uneven mixed temperature.
The medium speed coal mill air flue system has the following problems due to the technical scheme:
1. the air quantity measuring device is difficult to work normally; due to flow field disorder in the air duct, the displayed value of the air quantity is inconsistent with the actual value, the measurement precision is low, the air quantity deviates from the air-coal ratio curve, and great influence is brought to the safe, stable and economic operation of the coal mill and the boiler unit.
2. The opening degree of the air door and the measured value of the air volume cannot respond linearly; for preventing coal pulverizer air inlet overtemperature, generally open the cold-blast door earlier, the rethread adjusts the hot-blast door and carries out the wind temperature and adjust, because the cold wind pressure head is higher than hot-blast, can't advance hot-blast when often discovering the little aperture of hot-blast door, the amount of wind probably appears the step when reacing certain aperture, and the unable linear response of flow and air door aperture causes the unable automatic operation of putting into of coal pulverizer, influences the security of coal pulverizer operation even.
Patent numbers: 202020083734.1, discloses a grid type cold and hot air uniform mixing device, which comprises a shell and a grid plate, wherein the front and back walls of the shell are respectively provided with a mixed air outlet and a hot air inlet, the hot air inlet and the mixed air outlet are positioned on the same axis, one side wall of the shell is provided with a cold air inlet, and the cold air inlet, the hot air inlet and the mixed air outlet are rectangular; the interior of the shell is divided into a plurality of hot air channels and cold air channels by grid plates, the hot air channels and the cold air channels are distributed in a crossed manner, the hot air channels at the cold air inlet are provided with cold air sealing plates, the cold air channels at the hot air inlet are provided with hot air sealing plates, and the cold air sealing plates and the hot air sealing plates are in streamline shapes; it realizes improving hot-blast and cold wind mixing section flow field through complicated structure, and is with high costs, and the price of selling is in case the platform for more than ten.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hot air and cold air mixed connection system at the inlet of a medium-speed coal mill; the blocking of hot air by cold air with a high pressure head can be effectively avoided, the flow field of a hot air and cold air mixing section is greatly improved, and the uniformity of a speed field and a temperature field is improved, so that the measuring condition is improved, the accuracy of air volume measurement is improved, linear response is realized on the mixed air volume flow and the opening degree of an air door, and the coal mill is ensured to be put into automatic operation.
The technical problem to be solved by the invention is as follows:
the utility model provides a hot-blast and cold wind mixed connection system of medium speed pulverizer entry, includes hot-blast main, cold wind pipe, installs the drainage part at hot-blast main and one end and cold wind pipe intercommunication, the axis that cold wind pipe one end was kept away from to the drainage part is parallel to each other with the intraductal hot-blast flow direction of hot-blast, the one side that cold wind pipe one end set up near the hot-blast main end of giving vent to anger is kept away from to the drainage part.
According to the invention, the cold air in the cold air pipe is guided into the hot air pipe through the guide part, and the flow direction of the cold air flowing out of the guide part is ensured to be consistent with the flow direction of the hot air in the hot air pipe, so that a barrier is formed after the cold air vertically enters the hot air pipe, the flow field of a hot air and cold air mixing section is improved, and the mixing uniformity is improved.
In some possible embodiments, in order to effectively realize the guiding of cold air in the cold air pipe;
the drainage component comprises an air guide pipe which is communicated with the cold air pipe and is arranged in the hot air pipe.
In some possible embodiments, in order to prevent the cold air in the cold air pipe from vertically entering the hot air pipe, the hot air in the hot air pipe is blocked by the cold air with a higher pressure head;
the air guide pipe is an arc-shaped bent pipe, and the axis of one end of the air outlet of the air guide pipe is parallel to the flow direction of hot air in the hot air pipe; one end of an air inlet of the air guide pipe penetrates through the hot air pipe and extends into the connecting pipe body to be communicated with the connecting pipe body.
In some of the possible embodiments, the first and second,
one end of the air inlet of the air guide pipe is coaxially arranged with the connecting pipe body.
In some of the possible embodiments, the first and second,
one end of the air outlet of the air guide pipe is coaxial with the hot air pipe.
In some possible embodiments, in order to reduce the proportion of the cross section of the cold air pipe in the hot air pipe, the hot air loss is prevented from exceeding the limit;
the drainage component also comprises a trumpet-shaped air inlet pipe which is arranged at one end of an air inlet of the air guide pipe, and the small end of the air inlet pipe is coaxially communicated with the air inlet of the air guide pipe; the outer side of the large end of the air inlet pipe is connected with the inner side of the cold air pipe.
In some possible embodiments, in order to effectively realize the connection between the air inlet pipe and the cold air pipe;
the air inlet pipe is connected with the cold air pipe through welding.
In some possible embodiments, in order to effectively realize the connection between the hot air duct and the air guide duct;
the drainage component also comprises a fixing piece for fixing the hot air pipe and the air guide pipe.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the drainage component is arranged in the hot air pipe, so that cold air enters the hot air pipe after being guided and drained by the drainage component and is mixed with hot air in the hot air pipe; compared with the prior art, the vertical entering of cold air into the hot air pipe in the prior art is effectively avoided, and the blockage of the cold air with higher pressure head to the hot air is avoided due to the fact that the cold air pressure head is higher than the hot air pressure head, and the flow field of a hot air and cold air mixing section is greatly improved;
according to the invention, the drainage component is arranged, so that the uniformity of a speed field and a temperature field can be effectively improved, the measurement condition is improved, the accuracy of air volume measurement is improved, the linear response of the mixed air volume flow and the opening degree of an air door is realized, and the automatic operation of the coal mill is ensured;
according to the invention, the trumpet-shaped air inlet pipe is arranged, and the small end of the trumpet-shaped air inlet pipe is connected with the air guide pipe, so that the occupation ratio of the air guide pipe in the hot air pipe is effectively reduced, and the phenomenon that the hot air loss in the hot air pipe exceeds the limit due to the overhigh occupation ratio of the air guide pipe in the hot air pipe is avoided;
compared with the prior art, the drainage device is realized by adopting a complex drainage mechanism, has simple structure and strong practicability, and greatly reduces the cost.
Drawings
FIG. 1 is a schematic view showing a connection relationship between a cold air duct, a hot air duct, and a flow guide member according to the present invention;
FIG. 2 is an enlarged schematic view of a connection structure of a drainage member, a hot air pipe and a cold air pipe according to the present invention;
FIG. 3 is an enlarged schematic view of a connection structure of another drainage component, a hot air pipe and a cold air pipe in the present invention;
FIG. 4 is a schematic view of a prior art coal pulverizer inlet duct arrangement;
wherein: 1. a hot air pipe; 2. cold air; 3. a drainage component; 31. an air guide pipe; 32. and (6) an air inlet pipe.
Detailed Description
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. Reference herein to "first," "second," and similar words, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. In the implementation of the present application, "and/or" describes an association relationship of associated objects, which means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In the description of the embodiments of the present application, the meaning of "a plurality" means two or more unless otherwise specified. For example, the plurality of positioning posts refers to two or more positioning posts. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in detail below.
As shown in fig. 1-3:
the utility model provides a hot-blast and cold wind mixed connection system of medium speed pulverizer entry, includes hot-blast main 1, cold wind pipe 2, installs in hot-blast main 1 and the drainage part 3 of one end and 2 intercommunications of cold wind pipe, the axis that cold wind pipe 2 one end was kept away from to drainage part 3 is parallel to each other with hot-blast flow direction in the hot-blast main 1, drainage part 3 keeps away from 2 one end settings of cold wind pipe in the one side of being close to the hot-blast main 1 end of giving vent to anger.
When the cold air blowing device is used, cold air is firstly controlled to enter the hot air pipe 1 from the cold air pipe 2, and due to the arrangement of the drainage component 3, when the cold air flows out of the drainage component 3, the cold air is parallel to the flow direction of the hot air, and because the cold air pressure head is higher, the cold air cannot vertically enter the hot air pipe 1 to directly form a block without the drainage component 3 in the prior art, so that the hot air is prevented from flowing to one side of an air outlet of the hot air pipe after being started; so that the cold air and the hot air entering the hot air pipe 1 can be mixed in a mixing section formed by connecting the hot air pipe 1 and the cold air pipe 2;
according to the invention, the cold air in the cold air pipe 2 is guided into the hot air pipe 1 through the guide component 3, and the flow direction of the cold air flowing out of the guide component 3 is ensured to be consistent with the flow direction of the hot air in the hot air pipe 1, so that a barrier is formed after the cold air vertically enters the hot air pipe 1, the flow field of a hot air and cold air mixing section is improved, and the mixing uniformity is improved.
In some possible embodiments, in order to effectively realize the guiding of the cold air in the cold air pipe 2;
the drainage component 3 comprises an air guide pipe 31 which is communicated with the cold air pipe 2 and is arranged in the hot air pipe 1.
The air guide pipe 31 is arranged in the hot air pipe 1 and is communicated with the cold air pipe 2, so that cold air can enter the hot air pipe 1 after passing through the air guide pipe 31;
further, the air outlet of the air guide pipe 31 is arranged at one side close to the air outlet of the hot air pipe 1; the cold air passing through the air guide pipe 31 moves to one side of the air outlet of the hot air pipe 1;
in some possible embodiments, in order to prevent the cold air in the cold air pipe 2 from vertically entering the hot air pipe 1, the cold air with a higher pressure head blocks the hot air in the hot air pipe 1;
the air guide pipe 31 is an arc-shaped bent pipe, and the axis of one end of the air outlet of the air guide pipe is parallel to the flow direction of hot air in the hot air pipe 1; one end of the air inlet of the air guide pipe 31 penetrates through the hot air pipe 1 and extends into the connecting pipe body to be communicated with the connecting pipe body.
By adopting the arrangement of the arc-shaped bent pipe, cold air vertically enters the air guide pipe 31 through the cold air pipe 2 and then is guided through the arc-shaped bent pipe; the flow direction of the cold air is changed from being vertical to the hot air pipe 1 to be parallel to the flow direction of the hot air; the formation of a barrier is avoided and the mixing with hot air is prevented.
In some of the possible embodiments, the first and second,
one end of the air inlet of the air guide pipe 31 is coaxially arranged with the connecting pipe body.
In some of the possible embodiments, the first and second,
one end of the air outlet of the air guide pipe 31 is coaxially arranged with the hot air pipe 1.
In some possible embodiments, in order to reduce the proportion of the cross section of the cold air pipe 2 in the hot air pipe 1, the hot air loss is prevented from exceeding the limit;
the drainage component 3 also comprises a trumpet-shaped air inlet pipe 32 which is arranged at one end of an air inlet of the air guide pipe 31, and the small end of the air inlet pipe 32 is coaxially communicated with the air inlet of the air guide pipe 31; the outer side of the large end of the air inlet pipe 32 is connected with the inner side of the cold air pipe 2.
Furthermore, the size of the inner diameter and the outer diameter of the air inlet pipe 32 and the air guide pipe 31 are consistent, so that the volume of the air guide pipe 31 in the hot air pipe 1 is reduced, the hot air loss is avoided from exceeding the limit, and the mixing is not qualified.
In some possible embodiments, in order to effectively realize the connection between the air inlet pipe 32 and the cold air pipe 2;
the air inlet pipe 32 and the cold air pipe 2 are connected with each other by welding.
In some possible embodiments, in order to effectively realize the connection between the hot blast pipe 1 and the air guide pipe 31;
the drainage component 3 further comprises a fixing piece for fixing the hot air pipe 1 and the air guide pipe 31.
The fixing member is an angle steel, and is connected with the outside of the air guide pipe 31 and the inside of the hot air pipe 1 by welding.
According to the invention, cold air enters from the hot air channel downstream direction through the cold air pipe 2 and the drainage component 3, and the flow field of the mixing section is smooth, so that the accuracy of a measured value is ensured;
the invention can avoid the vertical blowing of cold air to hot air, reduce the resistance of the mixing section, uniformly mix the cold air and the hot air, and obtain more uniform air flow distribution and temperature distribution at the downstream;
the linear response of the mixed air flow and the opening degree of the air door is realized, and the automatic operation of the coal mill is ensured.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (8)
1. The utility model provides a hot-blast and cold wind mixed connection system of medium speed coal pulverizer entry, its characterized in that includes hot-blast main, cold wind pipe, installs at the interior just drainage component of one end and cold wind pipe intercommunication of hot-blast main, the axis that cold wind pipe one end was kept away from to the drainage component is parallel to each other with the interior hot-blast flow direction of hot-blast main, the one side that cold wind pipe one end set up near the hot-blast main end of giving vent to anger is kept away from to the drainage component.
2. The medium speed pulverizer inlet hot air and cold air mixing connection system according to claim 1, wherein the flow guide component comprises an air guide pipe communicated with the cold air pipe and installed in the hot air pipe.
3. The medium speed coal mill inlet hot air and cold air mixing and connecting system according to claim 2, wherein the air guide pipe is an arc-shaped bent pipe, and the axis of one end of the air outlet of the air guide pipe is parallel to the flow direction of hot air in the hot air pipe; one end of the air inlet of the air guide pipe penetrates through the hot air pipe and extends into the connecting pipe body to be communicated with the connecting pipe body.
4. The medium speed coal mill inlet hot air and cold air mixing and connecting system as claimed in claim 3, wherein one end of the air inlet of the air guide pipe is coaxially arranged with the connecting pipe body.
5. The medium speed coal mill inlet hot air and cold air mixing and connecting system according to claim 3, wherein one end of the air outlet of the air guide pipe is coaxially arranged with the hot air pipe.
6. The medium speed coal mill inlet hot air and cold air mixed connection system according to any one of claims 2 to 5, wherein the flow guide part further comprises a trumpet-shaped air inlet pipe arranged at one end of the air inlet of the air guide pipe, and the small end of the air inlet pipe is coaxially communicated with the air inlet of the air guide pipe; the outer side of the large end of the air inlet pipe is connected with the inner side of the cold air pipe.
7. The medium speed pulverizer inlet hot air and cold air mixing and connecting system according to claim 6, wherein the air inlet pipe and the cold air pipe are connected with each other by welding.
8. The medium speed coal mill inlet hot air and cold air hybrid connecting system according to any one of claims 2 to 5, wherein the flow guiding part further comprises a fixing part for fixing the hot air pipe and the air guiding pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210201579.2A CN114632613A (en) | 2022-03-02 | 2022-03-02 | Hot-blast and cold wind mixed connection system of medium speed pulverizer entry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210201579.2A CN114632613A (en) | 2022-03-02 | 2022-03-02 | Hot-blast and cold wind mixed connection system of medium speed pulverizer entry |
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| Publication Number | Publication Date |
|---|---|
| CN114632613A true CN114632613A (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210201579.2A Pending CN114632613A (en) | 2022-03-02 | 2022-03-02 | Hot-blast and cold wind mixed connection system of medium speed pulverizer entry |
Country Status (1)
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|---|---|
| CN (1) | CN114632613A (en) |
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- 2022-03-02 CN CN202210201579.2A patent/CN114632613A/en active Pending
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