CN210088913U - Fire detection cooling air system for preventing coal-fired boiler from coking - Google Patents
Fire detection cooling air system for preventing coal-fired boiler from coking Download PDFInfo
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- CN210088913U CN210088913U CN201920276885.6U CN201920276885U CN210088913U CN 210088913 U CN210088913 U CN 210088913U CN 201920276885 U CN201920276885 U CN 201920276885U CN 210088913 U CN210088913 U CN 210088913U
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Abstract
The utility model relates to a fire detection cooling air system for preventing coking of a coal-fired boiler, wherein a fire detection fan A and a fire detection fan B are respectively connected with a fire detection cooling air main pipe, and the fire detection cooling air main pipe is connected with a flame detector; the cold primary air main pipe is connected with a flame detector; the decoking agent storage tank is communicated with the first mixing port through a first decoking agent pipeline and a fire detection cooling air main pipe, wherein a first pipeline filter screen and a first decoking agent regulating valve are sequentially arranged on the first decoking agent pipeline; the decoking agent storage tank is also communicated with the second mixing port through a second decoking agent pipeline and a cold primary air branch pipe, wherein a second pipeline filter screen and a second decoking agent regulating valve are sequentially arranged on the second decoking agent pipeline. The utility model discloses a fire is examined cooling air system and is spouted decoking agent into the stove, not only utilizes decoking agent vaporization endotherm to reach the effect of effective cooling flame detector, examines the cooling air system moreover and can spout decoking agent uniformly in the stove and reach the effect with buggy air current intensive mixing reaction.
Description
Technical Field
The utility model relates to a cooling air system is examined to fire for preventing coal fired boiler coking.
Background
At present, the coal-fired boiler of a large power station has the problems of serious coking of a furnace water-cooled wall and a high-temperature heating surface due to the large difference between the coal type for burning and the designed coal type, defects in boiler structural design, improper operation and the like, so that the thermal efficiency of the boiler is reduced, the coal consumption is increased, and the economical efficiency is deteriorated; especially, when coking is serious, the large coke block falls down to cause the negative pressure of the hearth to fluctuate violently, fire extinguishing accidents of the hearth are caused, the safe operation of a unit is influenced, high-temperature corrosion is promoted by coking, and the service life of the boiler is greatly reduced. The boiler decoking agent as a chemical can change the reaction process of mineral substances in the boiler, thereby changing the ash fouling characteristic, improving the melting point of a eutectic of a coke layer, enabling secondary combustion to occur and spontaneous combustion to occur with organic matters in the coke layer at the temperature of 400 ℃; at the temperature of 700 ℃, under the action of airflow, the coke layer is loosened by the combustion and micro-explosion phenomena caused by collision and friction with carbon powder, sulfur and other combustible substances in the coke layer; in the process of penetrating the decoking agent into the coke layer, the crystal lattice of the coke layer is changed, so that the crystal of the coke layer is changed from hard nano feldspar and anorthite to loose quartz, mullite and the like, and therefore, the decoking agent can effectively relieve the coking problem of the boiler.
The fire detection cooling fan is an important auxiliary device of the boiler, and mainly has the main function of providing cooling air for the probes of the coal and oil burners to play a role of cooling the fire detection probes of the boiler; and secondly, the device also plays a role in cleaning the flame probe, such as the Chinese patent with the application number of 201620512983.1. When the outdoor temperature in summer rises, the ambient temperature of the installation positions of the fire detection cooling fan and the primary fan is higher, the cooling effect is poorer, the total flow of the air required to be cooled and blown is increased, the energy consumption of the fan is increased, and the failure shutdown of the fire detection fan is caused by the problem that the high-load operation of the fire detection fan easily causes vibration, so that the safe and stable operation of a boiler is influenced.
Therefore, it is necessary to develop a fire detection cooling air system for preventing coking of coal-fired boilers, which not only can effectively relieve coking problems of the boilers, but also can realize effective cooling of flame detectors, thereby achieving two purposes.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a fire and examine cooling air system for preventing coal fired boiler coking, adopt the fire to examine cooling air system and spout the decoking agent into the stove, not only can utilize decoking agent vaporization endotherm to reach the effect of effective cooling flame detector, fire is examined cooling air system and can be spouted the decoking agent evenly in the stove and reach the effect with buggy air current intensive mixing reaction moreover, and the mutual promotion is assisted mutually.
The utility model provides a technical scheme that above-mentioned problem adopted is: a fire detection cooling air system for preventing a coal-fired boiler from coking is characterized in that a fire detection fan A and a fire detection fan B are respectively connected with a fire detection cooling air main pipe through a cooling air pipe A and a cooling air pipe B, the fire detection cooling air main pipe is connected with a flame detector through a main pipe, wherein the cooling air pipe A is provided with a cooling air adjusting valve A, the cooling air pipe B is provided with a cooling air adjusting valve B, and the fire detection cooling air main pipe is sequentially provided with a first pressure gauge and a first check valve; the cold primary air main pipe is connected with the flame detector through a cold primary air branch pipe, wherein a cold primary air regulating valve, a second pressure gauge and a second check valve are sequentially arranged on the cold primary air branch pipe; the decoking agent storage tank is communicated with the first mixing port through a first decoking agent pipeline and a fire detection cooling air main pipe, wherein a first pipeline filter screen and a first decoking agent regulating valve are sequentially arranged on the first decoking agent pipeline; the decoking agent storage tank is communicated with the cold primary air branch pipe through a second decoking agent pipeline and a second mixing port, wherein a second pipeline filter screen and a second decoking agent regulating valve are sequentially arranged on the second decoking agent pipeline.
Preferably, the first mixing port and the second mixing port are both convergent-divergent nozzles, i.e., the flow area in the middle is small and the flow areas at both ends are large.
Preferably, a stirrer is arranged in the decoking agent storage tank and is connected with a driving motor; the top of the decoking agent storage tank is provided with a decoking agent feeding port; the water supplementing inlet is connected with the decoking agent storage tank through a water supplementing pipeline, and a water supplementing regulating valve is arranged on the water supplementing pipeline.
Preferably, the stirrer is positioned in the middle of the decoking agent storage tank and comprises a stirring shaft and a spiral stirring blade, and the spiral stirring blade is of a corrosion-resistant steel bar structure and is formed by spirally winding the stirring shaft serving as a center.
Preferably, the fire detection fan A is connected with the cold primary air main pipe in parallel and then connected with the flame detector, and the fire detection fan B is connected with the cold primary air main pipe in parallel and then connected with the flame detector.
Preferably, the decoking agent feeding port is of a funnel-shaped structure and is used for quantitatively feeding a powdery decoking agent or a liquid decoking agent, and the decoking agents with different concentrations are obtained by controlling the water replenishing amount.
Preferably, the water supplementing regulating valve, the first decoking agent regulating valve, the second decoking agent regulating valve, the A cooling air regulating valve, the B cooling air regulating valve and the cold primary air regulating valve are all controlled by a DCS, and the flow is automatically regulated according to the coking condition.
The working method of the fire detection cooling air system for preventing the coal-fired boiler from coking comprises the following steps:
step one, enabling a powdery decoking agent or a liquid decoking agent to enter a decoking agent storage tank through a decoking agent adding port, enabling water to enter the decoking agent storage tank through a water replenishing pipeline, and controlling decoking agent amount and water replenishing amount to obtain decoking agents with different concentrations;
step two, when the coal-fired boiler normally operates, cooling the fire detection probe by adopting cold primary air, closing the first check valve, opening the second check valve, mixing the cold primary air in the cold primary air main pipe with decoking agent in a second decoking agent pipeline through a cold primary air adjusting valve and a second pressure gauge to form atomized gas, entering the flame detector through the second check valve to cool the fire detection probe, and then spraying the atomized gas containing the decoking agent into the boiler to be fully mixed and combusted with the airflow containing pulverized coal in the boiler, so as to avoid coking of a water-cooled wall of a hearth;
and step three, when the primary air pressure in the cold primary air main pipe is insufficient, opening a first check valve, closing a second check valve, conveying fire detection cooling air by the A fire detection fan and/or the B fire detection fan to mix with a decoking agent in a first decoking agent pipeline through the fire detection cooling air main pipe to form atomized gas, entering a flame detector through the first check valve to cool the fire detection probe, then spraying the atomized gas containing the decoking agent into the furnace, and fully mixing and burning the atomized gas with airflow containing pulverized coal in the furnace to avoid coking of a water-cooled wall of the furnace chamber, wherein the A fire detection fan and the B fire detection fan can run in parallel or can be used for one by one.
Compared with the prior art, the utility model, have following advantage and effect:
1) the fire detection cooling air system is adopted to spray the decoking agent into the furnace, so that not only can the vaporization and heat absorption of the decoking agent be utilized to achieve the effect of effectively cooling the flame detector, but also the fire detection cooling air system can uniformly spray the decoking agent into the furnace to achieve the effect of fully mixing and reacting with the pulverized coal airflow, and mutual promotion and supplement are achieved.
2) The utility model discloses utilize the decoking agent, can reduce the fire and examine the cooling air volume of cooling blower or primary air fan, the performance of guarantee fan.
3) The utility model discloses a spout of zooming utilizes the cooling air to atomize the decoking agent and carry, and atomization effect is good, has saved the transport energy that the decoking agent squirted into the stove.
Drawings
FIG. 1 is a schematic structural diagram of a fire detection cooling air system for preventing coking of a coal-fired boiler according to an embodiment of the present invention.
In the figure: the device comprises a decoking agent storage tank 1, a stirrer 2, a driving motor 3, a decoking agent adding port 4, a water supplementing inlet 5, a fire detection fan A6, a fire detection fan B7, a primary cold air main pipe 8, a flame detector 9, a primary fire detection cooling air main pipe 10, a first pressure gauge 11, a first mixing port 12, a first check valve 13, a second mixing port 14, a second check valve 15, a main pipe 16, a water supplementing pipeline 17, a water supplementing regulating valve 18, a primary cold air branch pipe 19, a first decoking agent pipeline 21, a second decoking agent pipeline 22, a first pipeline filter screen 31, a second pipeline filter screen 32, a first decoking agent regulating valve 41, a second decoking agent regulating valve 42, a primary cold air regulating valve 61, a cooling air pipe 62, a cooling air pipe B71, a cooling air pipe B72, a primary cold air regulating valve 81, a second pressure gauge 82, a stirring shaft 201 and a spiral stirring blade 202.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, in the fire detection cooling air system for preventing coking of a coal-fired boiler in the embodiment, an a fire detection fan 6 and a B fire detection fan 7 are respectively connected with a fire detection cooling air main pipe 10 through an a cooling air pipe 62 and a B cooling air pipe 72, the fire detection cooling air main pipe 10 is connected with a flame detector 9 through a main pipe 16, wherein the a cooling air pipe 62 is provided with an a cooling air regulating valve 61, the B cooling air pipe 72 is provided with a B cooling air regulating valve 71, and the fire detection cooling air main pipe 10 is sequentially provided with a first pressure gauge 11 and a first check valve 13; the cold primary air main pipe 8 is connected with the flame detector 9 through a cold primary air branch pipe 19, wherein a cold primary air regulating valve 81, a second pressure gauge 82 and a second check valve 15 are sequentially arranged on the cold primary air branch pipe 19; the decoking agent storage tank 1 is communicated with the fire detection cooling air main pipe 10 through a first decoking agent pipeline 21 and a first mixing port 12, wherein a first pipeline filter screen 31 and a first decoking agent regulating valve 41 are sequentially arranged on the first decoking agent pipeline 21; the decoking agent storage tank 1 is also communicated with the second mixing port 14 through a second decoking agent pipeline 22 and a cold primary air branch pipe 19, wherein a second pipeline filter screen 32 and a second decoking agent regulating valve 42 are sequentially arranged on the second decoking agent pipeline 22.
The first mixing port 12 and the second mixing port 14 are both convergent-divergent nozzles, i.e., the flow area in the middle is small, and the flow areas at the two ends are large. A stirrer 2 is arranged in the decoking agent storage tank 1, and the stirrer 2 is connected with a driving motor 3; the top of the decoking agent storage tank 1 is provided with a decoking agent feeding port 4; the water replenishing inlet 5 is connected with the decoking agent storage tank 1 through a water replenishing pipeline 17, and a water replenishing regulating valve 18 is arranged on the water replenishing pipeline 17. Stirrer 2 is located the middle part of decoking agent storage tank 1, and stirrer 2 includes (mixing) shaft 201 and spiral stirring vane 202, and spiral stirring vane 202 is corrosion-resistant steel bar structure and uses (mixing) shaft 201 as central spiral winding and form. The A fire detection fan 6 is connected with the cold primary air main pipe 8 in parallel and then connected with the flame detector 9, and the B fire detection fan 7 is connected with the cold primary air main pipe 8 in parallel and then connected with the flame detector 9. The first and second duct screens 31 and 32 are located in front of the first and second decoking agent adjusting valves 41 and 42, respectively. The decoking agent feeding port 4 is of a funnel-shaped structure and is used for quantitatively feeding powdery decoking agent or liquid decoking agent, and decoking agents with different concentrations are obtained by controlling the water replenishing amount. The water supplementing regulating valve 18, the first decoking agent regulating valve 41, the second decoking agent regulating valve 42, the A cooling air regulating valve 61, the B cooling air regulating valve 71 and the cold primary air regulating valve 81 are all controlled by DCS, and the flow is automatically regulated according to the coking condition.
In this embodiment, the working method of the fire detection cooling air system for preventing coking of the coal-fired boiler includes the following steps:
step one, a powdery decoking agent or a liquid decoking agent enters a decoking agent storage tank 1 through a decoking agent feeding port 4, a water supplement enters the decoking agent storage tank 1 through a water supplement pipeline 17, and decoking agents with different concentrations are obtained by controlling decoking agent amount and water supplement amount;
step two, when the coal-fired boiler normally operates, cooling the fire detection probe by adopting cold primary air, closing the first check valve 13, opening the second check valve 15, mixing the cold primary air in the cold primary air main pipe 8 with the decoking agent in the second decoking agent pipeline 22 through the cold primary air regulating valve 81 and the second pressure gauge 82 to form atomized gas, entering the flame detector 9 through the second check valve 15 to cool the fire detection probe, then spraying the atomized gas containing the decoking agent into the boiler, and fully mixing and burning the atomized gas with the pulverized coal-containing gas flow in the boiler to avoid coking of a water-cooled wall of a hearth;
and step three, when the cold primary air pressure in the cold primary air main pipe 8 is insufficient, opening a first check valve 13, closing a second check valve 15, conveying fire detection cooling air by the A fire detection fan 6 and/or the B fire detection fan 7, mixing the fire detection cooling air with a decoking agent in a first decoking agent pipeline 21 through the fire detection cooling air main pipe 10 to form atomized gas, entering a flame detector 9 through the first check valve 13 to cool the fire detection probe, then spraying the atomized gas containing the decoking agent into the furnace, and fully mixing and burning the atomized gas with the pulverized coal-containing airflow in the furnace to avoid coking of the water-cooled wall of the hearth, wherein the A fire detection fan 6 and the B fire detection fan 7 can run in parallel or be used for one by one.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (6)
1. A fire detection cooling air system for preventing a coal-fired boiler from coking is characterized in that an A fire detection fan (6) and a B fire detection fan (7) are respectively connected with a fire detection cooling air main pipe (10) through an A cooling air pipe (62) and a B cooling air pipe (72), the fire detection cooling air main pipe (10) is connected with a flame detector (9) through a main pipe (16), wherein the A cooling air pipe (62) is provided with an A cooling air regulating valve (61), the B cooling air pipe (72) is provided with a B cooling air regulating valve (71), and the fire detection cooling air main pipe (10) is sequentially provided with a first pressure gauge (11) and a first check valve (13); the cold primary air main pipe (8) is connected with the flame detector (9) through a cold primary air branch pipe (19), wherein a cold primary air regulating valve (81), a second pressure gauge (82) and a second check valve (15) are sequentially arranged on the cold primary air branch pipe (19); the decoking agent storage tank (1) is communicated with the fire detection cooling air main pipe (10) through a first decoking agent pipeline (21) at a first mixing port (12), wherein a first pipeline filter screen (31) and a first decoking agent regulating valve (41) are sequentially arranged on the first decoking agent pipeline (21); decoking agent storage tank (1) still communicates in second mixed mouth (14) through second decoking agent pipeline (22) and cold primary air branch pipe (19), wherein second pipeline filter screen (32) and second decoking agent governing valve (42) are set gradually on second decoking agent pipeline (22).
2. The fire detection cooling air system for preventing coking of coal-fired boiler according to claim 1, characterized in that the first mixing port (12) and the second mixing port (14) are both convergent-divergent nozzles, i.e. small flow area in the middle and large flow area at both ends.
3. The fire detection cooling air system for preventing coking of coal-fired boiler according to claim 1, characterized in that a stirrer (2) is arranged in the decoking agent storage tank (1), and the stirrer (2) is connected with a driving motor (3); the top of the decoking agent storage tank (1) is provided with a decoking agent feeding port (4); the water replenishing inlet (5) is connected with the decoking agent storage tank (1) through a water replenishing pipeline (17), and a water replenishing regulating valve (18) is arranged on the water replenishing pipeline (17).
4. The fire detection cooling air system for preventing coking of coal-fired boiler according to claim 3, characterized in that the stirrer (2) is located in the middle of the decoking agent tank (1), and the stirrer (2) comprises a stirring shaft (201) and a spiral stirring blade (202), and the spiral stirring blade (202) is of corrosion-resistant steel bar structure and is spirally wound with the stirring shaft (201) as the center.
5. The fire detection cooling air system for preventing coking of the coal-fired boiler according to claim 1, characterized in that the fire detection fan (6) A and the cold primary air main pipe (8) are connected in parallel and then connected with the flame detector (9), and the fire detection fan (7) B and the cold primary air main pipe (8) are connected in parallel and then connected with the flame detector (9).
6. The fire detection cooling air system for preventing coking of coal-fired boiler according to claim 3, characterized in that the decoking agent feeding port (4) is of funnel-shaped structure for quantitatively feeding powdered decoking agent or liquid decoking agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920276885.6U CN210088913U (en) | 2019-03-05 | 2019-03-05 | Fire detection cooling air system for preventing coal-fired boiler from coking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920276885.6U CN210088913U (en) | 2019-03-05 | 2019-03-05 | Fire detection cooling air system for preventing coal-fired boiler from coking |
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| CN210088913U true CN210088913U (en) | 2020-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959026A (en) * | 2019-03-05 | 2019-07-02 | 华电电力科学研究院有限公司 | It is a kind of for preventing the fire inspection cooling air system and its working method of coal-burning boiler coking |
-
2019
- 2019-03-05 CN CN201920276885.6U patent/CN210088913U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109959026A (en) * | 2019-03-05 | 2019-07-02 | 华电电力科学研究院有限公司 | It is a kind of for preventing the fire inspection cooling air system and its working method of coal-burning boiler coking |
| CN109959026B (en) * | 2019-03-05 | 2023-11-28 | 华电电力科学研究院有限公司 | Fire detection cooling air system for preventing coking of coal-fired boiler and working method thereof |
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