CN214664579U - Cooling air system is examined to boiler fire - Google Patents
Cooling air system is examined to boiler fire Download PDFInfo
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- CN214664579U CN214664579U CN202120763095.8U CN202120763095U CN214664579U CN 214664579 U CN214664579 U CN 214664579U CN 202120763095 U CN202120763095 U CN 202120763095U CN 214664579 U CN214664579 U CN 214664579U
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Abstract
The utility model provides a cooling air system is examined to boiler fire, include: fire detection supply air duct, examine cooling air duct and two wind pipelines once with the fire of fire detection supply air duct intercommunication, fire detection supply air duct is connected with the flame detector, be used for to the flame detector carries the cooling air, fire detection cooling air duct is provided with check valve and stop valve along gas conveying direction, and two wind pipelines once all have set gradually stop valve, filter, stop valve and check valve along gas conveying direction, still are provided with first connecting tube, second connecting tube, third connecting tube between two wind pipelines once, and all are provided with the stop valve on first connecting tube, second connecting tube, the third connecting tube. The utility model discloses a cooling air system is examined to boiler fire has simple structure, and is easy and simple to handle, saves the station service power, advantage that the cooling air quality is high.
Description
Technical Field
The utility model relates to a thermal power equipment technical field specifically relates to a cooling air system is examined to boiler fire.
Background
In the thermal power generation process, a flame detector is generally required to be used for fire detection of a boiler to judge the operation condition of the boiler, and meanwhile, the flame detector is also an important step for realizing safe monitoring of a hearth of the boiler to ensure the safe operation of the boiler, but because the flame detector always works in a high-temperature environment, the flame detector is easy to damage and causes monitoring failure, and therefore, the flame detector needs to be cooled in real time, in the prior art, two fire detection cooling fans are generally used for generating fire detection cooling air to cool the flame detector in real time, so that the fire detection cooling fans must be in a working state as long as the boiler operates, when the fire detection cooling fans have operation faults, the boiler can generate fire extinguishing protection actions to influence the normal operation of a unit, and the fire detection cooling fans continuously provide the cooling air to increase the service power, therefore, the primary wind direction generated by a primary fan in the coal-fired unit can be adopted to provide cooling wind for the flame detector, and the flame detector is cooled in a standby mode by using a fire detection cooling fan.
However, because the required cooling air quality of flame detector is higher, consequently need set up the filter on the pipeline of primary air, along with the live time increase of filter, the pressure differential crescent at filter both ends, can make the cooling air pressure value of offering flame detector low excessively, influence the normal use of flame detector, produce the influence to the normal operation of unit, need clean the filter, and, leave over impurity such as dust easily in the pipeline at the in-process of clean filter, when carrying the cooling air through this pipeline once more, can pollute the cooling air, when serious, can influence the normal work of flame detector.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a cooling air system is examined to boiler fire to solve foretell utilization fire and examine cooling blower and provide the cooling air and lead to the station service power rate to increase, and utilize behind the primary air fan provides the cooling air, the problem that the cooling air quality is low.
In order to achieve the above object, an embodiment of the present invention provides a cooling air system is examined to boiler fire, include:
the flame detection air supply pipeline is connected with the flame detector and used for supplying cooling air to the flame detector;
the fire detection cooling air pipeline is communicated with the fire detection air supply pipeline, and a first check valve are sequentially arranged on the fire detection cooling air pipeline along the air conveying direction;
the first primary air pipeline is communicated with the fire detection air supply pipeline, and a second stop valve, a first filter, a third stop valve and a second stop valve are sequentially arranged on the first primary air pipeline along the air conveying direction;
the second primary air pipeline is communicated with the fire detection air supply pipeline, and a fourth stop valve, a second filter, a fifth stop valve and a third stop valve are sequentially arranged on the second primary air pipeline along the air conveying direction;
the first primary air pipeline and the second primary air pipeline are communicated with each other through a first connecting pipeline, a second connecting pipeline and a third connecting pipeline, and a sixth stop valve is arranged on each of the first connecting pipeline, the second connecting pipeline and the third connecting pipeline; the air inlet end of second stop valve with the air inlet end of fourth stop valve is connected respectively at first connecting tube's both ends, the both ends of second connecting tube are connected respectively the air inlet end of first filter with the air-out end of second filter, the both ends of third connecting tube are connected respectively the air-out end of first filter with the air-in end of second filter.
Optionally, the air inlet end of the fire detection cooling air pipeline is connected with a fire detection cooling fan, and the fire detection cooling fan supplies cooling air to the flame detector through the fire detection cooling air pipeline and the fire detection air supply pipeline.
Optionally, the number of the fire detection cooling fans is two.
Optionally, the air inlet end of the first primary air pipeline and the air inlet end of the second primary air pipeline are respectively connected to a corresponding primary air fan, and the two primary air fans respectively supply cooling air to the flame detector through the first primary air pipeline, the second primary air pipeline and the fire detection air supply pipeline.
Optionally, the first stop valve, the second stop valve, the third stop valve, the fourth stop valve, the fifth stop valve and the sixth stop valve are all pneumatic stop valves.
Optionally, a first pressure difference alarm is arranged on the first primary air pipeline, and the first pressure difference alarm is connected with the air inlet end and the air outlet end of the first filter and used for generating an alarm when the pressure difference between the air inlet end and the air outlet end of the first filter is greater than a first preset pressure difference value.
Optionally, a second pressure difference alarm is arranged on the second primary air pipeline, and the second pressure difference alarm is connected with the air inlet end and the air outlet end of the second filter and used for generating an alarm when the pressure difference between the air inlet end and the air outlet end of the second filter is greater than a second preset pressure difference value.
Optionally, an under-pressure alarm is arranged on the fire detection air supply pipeline and used for giving an alarm when the gas pressure in the fire detection air supply pipeline is smaller than a pressure threshold value.
The utility model discloses an increase the cold air and examine the cooling-air as the fire of boiler normal operating to examine cooling blower as reserve with the fire, improve the fire and examine cooling-air operation reliability, guarantee boiler safety operation, reduce the fire and examine cooling blower operation maintenance number of times, practice thrift the station service power, the extension fire is examined cooling blower life, just the utility model discloses a system simple structure, reform transform with low costs, easily realize, operation process is simple and convenient, through set up the intercommunication pipeline between two air pipes, can make the filter after the clean maintenance, introduce another filter with the air that passes through and filter in, avoid in the impurity entering blast pipe way of the in-process production of clean filter, guarantee the quality of cold air.
Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a boiler fire detection cooling air system provided by the utility model.
Description of the reference numerals
1-fire detection air supply pipeline; 2-a flame detector; 3-fire detecting a cooling air pipeline;
4-a first primary air duct; 5-a second primary air duct; 6-a first connecting pipe;
7-a second connecting conduit; 8-a third connecting conduit; 9-a sixth stop valve;
10-a primary air fan; 11-undervoltage alarm; 31-a first check valve;
32-a first stop valve; 33-fire detection cooling fan; 41-a second stop valve;
42-a first filter; 43-a third stop valve; 44-a second check valve;
45-a first differential pressure alarm; 51-a fourth stop valve; 52-a second filter;
53-fifth stop valve; 54-a third check valve; 55-second differential pressure alarm.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.
In the embodiments of the present invention, unless otherwise stated, the use of directional terms such as "upper, lower, left, and right" generally refers to the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when in use.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures are necessarily perfectly parallel, but may be slightly tilted.
The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal, vertical or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Furthermore, the terms "substantially", and the like are intended to indicate that the relative terms are not necessarily strictly required, but may have some deviation. For example: "substantially equal" does not mean absolute equality, but it is difficult to achieve absolute equality in actual production and operation, and certain deviations generally exist. Thus, in addition to absolute equality, "substantially equal" also includes the above-described case where there is some deviation. In this case, unless otherwise specified, terms such as "substantially", and the like are used in a similar manner to those described above.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is the utility model provides a cooling air system is examined to boiler fire gets schematic structure, as shown in fig. 1, the embodiment of the utility model provides a cooling air system is examined to boiler fire, include:
the fire detection air supply pipeline 1 is connected with the flame detector 2 and used for supplying cooling air to the flame detector 2;
the fire detection cooling air pipeline 3 is communicated with the fire detection air supply pipeline 1, and a first check valve 31 and a first check valve 32 are sequentially arranged on the fire detection cooling air pipeline 3 along the air conveying direction;
the first primary air pipeline 4 is communicated with the fire detection air supply pipeline 1, and a second stop valve 41, a first filter 42, a third stop valve 43 and a second stop valve 44 are sequentially arranged on the first primary air pipeline 4 along the air conveying direction;
a second primary air duct 5 which is communicated with the fire detection air supply duct 1, wherein a fourth stop valve 51, a second filter 52, a fifth stop valve 53 and a third check valve 54 are sequentially arranged on the second primary air duct 5 along the air conveying direction;
the first primary air pipeline 4 and the second primary air pipeline 5 are communicated with each other through a first connecting pipeline 6, a second connecting pipeline 7 and a third connecting pipeline 8, and a sixth stop valve 9 is arranged on each of the first connecting pipeline 6, the second connecting pipeline 7 and the third connecting pipeline 8; the both ends of first connecting pipeline 6 are connected respectively the air inlet end of second stop valve 41 with the air inlet end of fourth stop valve 51, the both ends of second connecting pipeline 7 are connected respectively the air inlet end of first filter 42 with the air-out end of second filter 52, the both ends of third connecting pipeline 8 are connected respectively the air-out end of first filter 42 with the air inlet end of second filter 52.
In particular, the flame detector 2 is also commonly referred to as a fire detection probe; the method is characterized in that cold primary air is added to serve as fire detection cooling air when a boiler normally operates, the fire detection cooling fan serves as a spare, and the method can be improved on the pipeline structure of the existing power plant, in the existing power plant, two primary fans 10 are usually arranged and used for supplying steam to a coal mill to blow powder to the boiler, therefore, a 240 air pipe can be respectively connected to two primary air pipelines of the existing system to a fire detection air supply pipeline, primary air is used for cooling a flame detector, wherein the first check valve 31, the second check valve 44 and the third check valve 54 are all used for avoiding backflow of the cooling air and ensuring that air can only flow in each pipeline in a one-way manner, the fire detection cooling air pipeline 3 is provided with the first check valve 32 along the air conveying direction, when primary air is used for fire detection cooling, the fire detection cooling fan 33 is stopped, the first check valve 32 is used for cutting off a passage between the fire detection cooling fan 33 and the fire detection air supply pipeline 1, and the sixth isolation valves 9 on the first connecting pipe 6, the second connecting pipe 7 and the third connecting pipe 8 are in a closed state; because the primary air fans 10 corresponding to the first primary air pipeline 4 and the second primary air pipeline 5 are connected, according to the air volume provided by the two primary air fans 10 to the coal pulverizer (not shown), the primary air provided by the first primary air pipeline 4 and/or the second primary air pipeline 5 can be determined, and the corresponding valve opening and closing adjustment is performed, in this embodiment, when only the first primary air pipeline 4 is used to provide cooling air, the fourth stop valve 51 and the fifth stop valve 53 on the second primary air pipeline 5 are closed, and the primary air fans 10 do not provide air to the second primary air pipeline 5, when the cooling air passes through, the cooling air is filtered by the first filter 42, so as to ensure the quality of the cooling air, after the first filter 42 is used for a period of time, the first filter 42 needs to be cleaned, at this time, in order to ensure the normal supply of the cooling air, the sixth stop valve 9, the fourth stop valve 51 and the fifth stop valve 53 on the first communication pipeline 6 can be opened and closed to close the second stop valve 41 and the third stop valve 43, the cooling air in the first primary air pipeline 4 is introduced into the second primary air pipeline 5, filtered by the second filter 52 and provided to the flame detector, and, since the filter screen and other parts in the first filter 42 need to be replaced in the process of cleaning the first filter 42, the impurities such as dust on the filter screen can fall into the first filter 42 and enter into the first primary air pipeline 4, and at the next use, the impurities such as remaining dust can enter into the fire detection system along with the cooling air, which may cause the flame detector 2 to work abnormally or damage the flame detector 2, reduce the service life and the service time of the flame detector, therefore, therefore, after the first filter 42 is cleaned, the second isolation valve 41 and the sixth isolation valve 9 on the third communication pipeline 8 are conducted, so that the cooling air introduces the first filter 42 and the impurities in the pipeline, such as dust, into the second filter 52, the impurities are filtered by the second filter 52 and then supplied to the flame detector 2, after a preset time, the third isolation valve 43 is conducted again, the sixth isolation valve 9, the fourth isolation valve 51 and the fifth isolation valve 53 on the third communication pipeline 8 are closed, the cooling air is supplied to the flame detector 2 through the first primary air pipeline 4, the principle of supplying the cooling air only by using the second primary air pipeline 5 and the cooling air simultaneously by using the first primary air pipeline 4 and the second primary air pipeline 5 are the same as the above principle, only corresponding valve opening and closing adjustment needs to be performed, the operation principle of cleaning the second filter 52 is the same as the above principle, and will not be discussed further herein.
Further, the air inlet end of the fire detection cooling air pipeline 3 is connected with a fire detection cooling fan 33, the fire detection cooling fan 33 supplies cooling air to the flame detector 2 through the fire detection cooling air pipeline 3 and the fire detection air supply pipeline 1, and in the embodiment, the fire detection cooling fan 33 is a fan with the model number of M20A160M2B, the rated power of 15KW and the rated rotating speed of 2917 r/min.
Further, the number of the fire detection cooling fans 33 is two. Further, after the primary air is used as the cooling air of the fire detection system, only one fire detection cooling fan 33 may be provided as a standby fan.
Further, the air inlet end of the first primary air pipeline 4 and the air inlet end of the second primary air pipeline 5 are respectively connected to a corresponding primary air fan 10, and the two primary air fans 10 respectively provide cooling air for the flame detector 2 through the first primary air pipeline 4, the second primary air pipeline 5 and the fire detection air supply pipeline 1. Specifically, the primary air fans 10 are generally provided in two numbers, one primary air fan 10 is connected to the first primary air duct 4, and the other primary air fan 10 is connected to the second primary air duct 5, so that when the primary air is used as the cooling air, the primary air provided by one primary air fan 10 can be used as the cooling air, and the two primary air fans 10 can also be used together to provide the cooling air.
Further, the first, second, third, fourth, fifth, and sixth cut-off valves 32, 41, 43, 51, 53, and 9 are all pneumatic cut-off valves. Particularly, all stop valves are set to be pneumatic stop valves, the function of quick cut-off is achieved, and the pneumatic stop valves are simple in structure, sensitive in reaction and reliable in action. Still further, the shutoff valve may also be provided as an electric shutoff valve.
Further, be provided with first pressure differential alarm 45 on the first primary air pipeline 4, first pressure differential alarm 45 with the air inlet end and the air-out end of first filter 42 are connected, are used for the air inlet end of first filter 42 and the air-out pressure differential of end produce the warning when being greater than first preset pressure difference. Specifically, the first pressure difference alarm 45 is arranged at the air inlet end and the air outlet end of the first filter 42, and the alarm of the first pressure difference alarm 45 is used as a basis for cleaning the first filter 42, so that the phenomenon that the pressure difference between the two ends of the first filter 42 is too large, the air pressure of cooling air entering the fire detection air supply pipeline 1 is insufficient, the alarm is caused, and the normal operation of a unit is influenced can be avoided.
Further, a second pressure difference alarm 55 is arranged on the second primary air pipeline 5, and the second pressure difference alarm 55 is connected with the air inlet end and the air outlet end of the second filter 52 and used for giving an alarm when the pressure difference between the air inlet end and the air outlet end of the second filter 52 is greater than a second preset pressure difference value. Specifically, the second pressure difference alarm 55 is arranged at the air inlet end and the air outlet end of the second filter 52, and the alarm of the second pressure difference alarm 55 is used as the basis for cleaning the second filter 52, so that the phenomenon that the pressure difference between the two ends of the second filter 52 is too large, the air pressure of cooling air entering the fire detection air supply pipeline 1 is insufficient, the alarm is caused, and the normal operation of the unit is influenced can be avoided.
In another embodiment, the first preset pressure difference and the second preset pressure difference may be set to be the same or different.
Further, be provided with under-voltage alarm 11 on fire detection blast pipe 1, under-voltage alarm 11 is used for producing the warning when the gas pressure in fire detection blast pipe 1 is less than the pressure threshold value.
Specifically, the under-voltage alarm 11 that sets up can be based on the pressure of cooling air in the air supply duct 1 is examined to the fire reports to the police, avoids the fire to examine the pressure of cooling air in the air supply duct 1 not enough, leads to the damage of flame detector, and further, under-voltage alarm 11 can also be replaced by the manometer.
In the embodiment, when primary air is adopted as cooling air, regular trial rotation work of the fire detection cooling fan 33 needs to be done to ensure reliable standby of the fire detection cooling fan 33, and when an accident situation occurs in primary air supply, the fire detection cooling fan 33 is adopted to supply cooling air; when the unit is shut down, a fire detection cooling fan 33 needs to be started in advance to operate, and after the boiler is shut down, the smoke temperature at the outlet of the hearth is lower than 80 ℃, so that the operation of the fire detection cooling fan 33 can be stopped.
The above describes in detail optional implementation manners of embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details in the above implementation manners, and in the technical concept scope of the embodiments of the present invention, it is possible to perform various simple modifications on the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, various different implementation manners of the embodiments of the present invention can be combined arbitrarily, and as long as it does not violate the idea of the embodiments of the present invention, it should be considered as the disclosure of the embodiments of the present invention.
Claims (8)
1. A boiler fire detection cooling air system, comprising:
the fire detection air supply pipeline (1) is connected with the flame detector (2) and is used for conveying cooling air to the flame detector (2);
the fire detection cooling air pipeline (3) is communicated with the fire detection air supply pipeline (1), and a first check valve (31) and a first check valve (32) are sequentially arranged on the fire detection cooling air pipeline (3) along the air conveying direction;
the first primary air pipeline (4) is communicated with the fire detection air supply pipeline (1), and a second stop valve (41), a first filter (42), a third stop valve (43) and a second check valve (44) are sequentially arranged on the first primary air pipeline (4) along the air conveying direction;
the second primary air pipeline (5) is communicated with the fire detection air supply pipeline (1), and a fourth stop valve (51), a second filter (52), a fifth stop valve (53) and a third check valve (54) are sequentially arranged on the second primary air pipeline (5) along the air conveying direction;
the first primary air pipeline (4) and the second primary air pipeline (5) are communicated with each other through a first connecting pipeline (6), a second connecting pipeline (7) and a third connecting pipeline (8), and a sixth stop valve (9) is arranged on each of the first connecting pipeline (6), the second connecting pipeline (7) and the third connecting pipeline (8); the both ends of first connecting tube (6) are connected respectively the air inlet end of second stop valve (41) with the air inlet end of fourth stop valve (51), the both ends of second connecting tube (7) are connected respectively the air inlet end of first filter (42) with the air-out end of second filter (52), the both ends of third connecting tube (8) are connected respectively the air-out end of first filter (42) with the air inlet end of second filter (52).
2. The boiler fire detection cooling air system according to claim 1, wherein an air inlet end of the fire detection cooling air duct (3) is connected with a fire detection cooling fan (33), and the fire detection cooling fan (33) supplies cooling air to the flame detector (2) through the fire detection cooling air duct (3) and the fire detection air supply duct (1).
3. The boiler fire detection cooling air system according to claim 2, wherein the number of the fire detection cooling fans (33) is two.
4. The boiler fire detection cooling air system according to claim 1, wherein an air inlet end of the first primary air duct (4) and an air inlet end of the second primary air duct (5) are respectively connected to a corresponding one of the primary air fans (10), and the two primary air fans (10) respectively supply cooling air to the flame detector (2) through the first primary air duct (4), the second primary air duct (5) and the fire detection air supply duct (1) together.
5. The boiler fire detection cooling air system according to claim 1, wherein the first stop valve (32), the second stop valve (41), the third stop valve (43), the fourth stop valve (51), the fifth stop valve (53) and the sixth stop valve (9) are all pneumatic stop valves.
6. The boiler fire detection cooling air system according to claim 1, wherein a first pressure difference alarm (45) is arranged on the first primary air pipeline (4), and the first pressure difference alarm (45) is connected with an air inlet end and an air outlet end of the first filter (42) and used for generating an alarm when the pressure difference between the air inlet end and the air outlet end of the first filter (42) is greater than a first preset pressure difference value.
7. The boiler fire detection cooling air system according to claim 1, wherein a second pressure difference alarm (55) is arranged on the second primary air pipeline (5), and the second pressure difference alarm (55) is connected with the air inlet end and the air outlet end of the second filter (52) and used for giving an alarm when the pressure difference between the air inlet end and the air outlet end of the second filter (52) is greater than a second preset pressure difference value.
8. The boiler fire detection cooling air system according to claim 1, wherein an under-pressure alarm (11) is arranged on the fire detection air supply pipeline (1), and the under-pressure alarm (11) is used for generating an alarm when the gas pressure in the fire detection air supply pipeline (1) is smaller than a pressure threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120763095.8U CN214664579U (en) | 2021-04-14 | 2021-04-14 | Cooling air system is examined to boiler fire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120763095.8U CN214664579U (en) | 2021-04-14 | 2021-04-14 | Cooling air system is examined to boiler fire |
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| CN214664579U true CN214664579U (en) | 2021-11-09 |
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| CN202120763095.8U Active CN214664579U (en) | 2021-04-14 | 2021-04-14 | Cooling air system is examined to boiler fire |
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