CN212408631U - Pulverized coal fired boiler combining indoor air and outdoor air - Google Patents
Pulverized coal fired boiler combining indoor air and outdoor air Download PDFInfo
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- CN212408631U CN212408631U CN202020361890.XU CN202020361890U CN212408631U CN 212408631 U CN212408631 U CN 212408631U CN 202020361890 U CN202020361890 U CN 202020361890U CN 212408631 U CN212408631 U CN 212408631U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a pulverized coal boiler combining indoor air and outdoor air, which comprises an outdoor primary air inlet and an outdoor secondary air inlet which are communicated with the outdoor, wherein the outdoor primary air inlet is sequentially connected with a primary air fan, a warm air blower and a primary air preheater through pipelines, an indoor primary air channel inlet is also arranged above the outdoor primary air inlet, the indoor primary air channel inlet is connected between the outdoor primary air inlet and the primary air fan through a pipeline, the outdoor secondary air inlet is sequentially connected with a secondary air fan through a pipeline, the indoor secondary air channel inlet is also arranged above the outdoor secondary air inlet, and the indoor secondary air channel inlet is connected between the outdoor secondary air inlet and the secondary fan through a pipeline. The utility model discloses can avoid the fan heater to leak, the air preheater blocks up and arouses the boiler to shut down, increase unit electric load.
Description
Technical Field
The utility model belongs to the technical field of pulverized coal boiler, a pulverized coal boiler who combines indoor wind and outdoor wind is related to.
Background
At present, an inlet of a primary air fan and an outlet of a secondary air fan of a pulverized coal boiler are designed to be outdoor air, a fan heater is installed at an outlet of the fan, the temperature of the primary air outlet and the temperature of the secondary air outlet need to be maintained above 20 ℃, the fan heater needs to be put into operation when the environmental temperature is lower than 20 ℃ in order to avoid ash blockage of an air preheater of the pulverized coal boiler, the time of the environmental temperature of northern China is about 6 months when the environmental temperature is lower than 20 ℃, the time of individual areas is longer, the air consumption of the fan heater is larger, and consumption reduction and. If the environment temperature is lower than 20 ℃ and the air heater is not put into operation in time, the air preheater has low-temperature corrosion phenomenon in operation, the air preheater is blocked, and the furnace is required to be shut down for dredging. The running time of the air heater is long, the air heater frequently leaks, and the air heater is easy to block due to the fact that the air heater is withdrawn from the air heater to process leakage, so that vicious circle is formed.
And primary air and secondary air hot air recirculation is added in part of enterprises, and the air heater is put into operation when the ambient temperature is lower than 15 ℃, so that the operation time of the air heater is reduced, and the leakage rate of the air heater is effectively reduced. But the current of the primary fan and the secondary fan is increased, the operation of the air heater is still needed when the environmental temperature is lower than 10 ℃, and the long-period operation of the boiler can not be guaranteed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a pulverized coal fired boiler who combines indoor wind and outdoor wind through introducing indoor wind, improves boiler one, overgrate air inlet temperature, avoids the air heater to leak, the air preheater blocks up and arouses the boiler to shut down, improves boiler operation duration, increases unit power generation load.
The utility model adopts the technical proposal that the pulverized coal boiler combining the indoor air and the outdoor air comprises an outdoor primary air inlet and an outdoor secondary air inlet which are communicated with the outdoor, the outdoor primary air inlet is sequentially connected with a primary air fan, a warm air blower a and a primary air preheater through pipelines, a silencer a is arranged at the outdoor primary air inlet, an indoor primary air channel inlet is also arranged at the indoor position above the outdoor primary air inlet, the indoor primary air channel inlet is connected between the outdoor primary air inlet and the primary air fan through a pipeline, the outdoor secondary air inlet is sequentially connected with a secondary air fan through a pipeline, the indoor secondary air inlet is connected between the outdoor secondary air inlet and the secondary fan through a pipeline.
The utility model is also characterized in that,
the inlet of the primary air blower is connected with the outlet of the primary air preheater through a hot air recirculation pipeline a, and the inlet of the secondary air blower is connected with the outlet of the secondary air preheater through a hot air recirculation pipeline b.
And a hot air recycling manual valve a and a hot air recycling manual valve b are respectively arranged on the hot air recycling pipeline a and the hot air recycling pipeline b.
The elevation of the outdoor primary air inlet and the outdoor secondary air inlet is 10m, and the elevation of the indoor primary air channel inlet and the indoor secondary air channel inlet is 40 m.
The inlets of the primary air fan and the secondary air fan are both provided with regulating valves.
And control valves are arranged at the outlets of the warm air blower a and the warm air blower b.
The outdoor primary air inlet, the outdoor secondary air inlet, the indoor primary air channel inlet and the indoor secondary air channel inlet are all provided with valves.
The utility model has the advantages that:
the utility model improves the inlet temperature of the primary air and the secondary air of the boiler by introducing the indoor air, the air heater does not need to be put into operation during the normal operation period, the leakage of the air heater is avoided, and the safe operation of the boiler is ensured; during normal operation, hot air is recycled without operation, the current of the primary fan and the secondary fan is reduced, and the generating load of the unit is increased.
Drawings
Fig. 1 is a schematic structural view of a pulverized coal boiler according to the present invention, which combines indoor air and outdoor air.
In the figure, 1 is an outdoor primary air inlet, 2 is a primary fan, 3 is a warm air blower a, 4 is a primary air preheater, 5 is a silencer a, 6 is an indoor primary air duct inlet, 7 is an outdoor secondary air inlet, 8 is a secondary fan, 9 is a warm air blower b, 10 is a secondary air preheater, 11 is an indoor secondary air duct inlet, 12 is a silencer b, 13 is an adjusting valve, 14 is a manual gate valve, 15 is a hot air recycling pipeline a, 16 is a hot air recycling pipeline b, 17 is a hot air recycling manual valve a, 18 is a hot air recycling manual valve b, 19 is a manual gate valve.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a pulverized coal boiler combining indoor air and outdoor air, the structure of which is shown in figure 1, comprising an outdoor primary air inlet 1 and an outdoor secondary air inlet 7 which are communicated with the outdoor, the outdoor primary air inlet 1 is connected with a primary air fan 2, a warm air blower a3 and a primary air preheater 4 in turn through pipelines, a silencer a5 is arranged at the outdoor primary air inlet 1, an indoor primary air duct inlet 6 is arranged above the outdoor primary air inlet 1, the indoor primary air duct inlet 6 is connected between the outdoor primary air inlet 1 and the primary air fan 2 through a pipeline, the outdoor secondary air inlet 7 is connected with a secondary air fan 8 in turn through a pipeline, the air heater b9 and the secondary air preheater 10, the outdoor secondary air inlet 7 is also provided with a silencer b12, the indoor secondary air inlet 11 is also arranged above the outdoor secondary air inlet 7, and the indoor secondary air inlet 11 is connected between the outdoor secondary air inlet 7 and the secondary air fan 8 through a pipeline.
The inlet of the primary air blower 2 is also connected with the outlet of the primary air preheater 4 through a hot air recirculation pipeline a15, and the inlet of the secondary air blower 8 is also connected with the outlet of the secondary air preheater 10 through a hot air recirculation pipeline b 16.
The hot air recycling pipeline a15 and the hot air recycling pipeline b16 are respectively provided with a hot air recycling manual valve a17 and a hot air recycling manual valve b 18.
The elevation of the outdoor primary air inlet 1 and the outdoor secondary air inlet 7 is 10m, and the elevation of the indoor primary air channel inlet 6 and the indoor secondary air channel inlet 11 is 40 m.
The inlets of the primary air fan 2 and the secondary air fan 8 are both provided with regulating valves 13.
And manual gate valves 19 are arranged at the outdoor primary air inlet 1, the outdoor secondary air inlet 7, the indoor primary air duct inlet 6 and the indoor secondary air duct inlet 11.
The utility model relates to a pulverized coal boiler who combines indoor wind and outdoor wind's theory of operation does:
the utility model discloses in boiler primary air fan 2, overfire air fan 8 lead to the stove outside by the left and right sides wall through outdoor primary air entry 1 and outdoor overfire air entrance 7, the air in the boiler room mixes with outdoor overfire air under primary air fan 2, overfire air fan 8's effect through indoor primary air duct entry 6 and indoor overfire air duct entry 11, the stove body high temperature air of being convenient for gets into one, overfire air system.
Hot air in the boiler chamber is sucked into primary air supply through the inlet 6 of the indoor primary air duct, so that the temperature of the primary air inlet is increased, and a primary air heater a3 is not required to be put into operation during the normal operation of the boiler;
the hot air in the boiler chamber is sucked through the inlet 11 of the indoor secondary air duct to supply secondary air, so that the temperature of the inlet of the secondary air is increased, and a secondary air supply heater b9 is not required during the normal operation of the boiler.
The utility model discloses with the hot-blast supply one in the boiler chamber, overgrate air, improve one, overgrate air entry temperature, need not throw the warm braw ware of fortune during normal operating, practiced thrift steam for the warm braw ware on the one hand, on the other hand prevents that cold air from getting into the air preheater and causing low temperature corrosion and block up.
The utility model discloses a governing valve 13 is used for adjusting the amount of wind.
The utility model discloses introduce the air-out of once air preheater 4 and secondary air preheater 10 and mix with indoor outdoor overgrate air respectively, further improved the entry temperature of overgrate air.
The utility model discloses control valve 14 need close this control valve when the overfire air fan overhauls, prevents that the overfire air from falling the cluster.
The utility model improves the inlet temperature of the primary air and the secondary air of the boiler, the air heater does not need to be put into operation during the normal operation period, the leakage of the air heater is avoided, and the safe operation of the boiler is ensured; during normal operation, hot air is recycled without operation, and the current of the primary fan and the secondary fan is reduced. As shown in fig. 1, two sets of primary air channels and two sets of secondary air channels are respectively arranged, the upper and lower sets of primary air channels connect the ends of the two control valves 14 far away from the warm air blower a3 through pipelines, the upper and lower sets of secondary air channels connect the ends of the two control valves 14 far away from the warm air blower b3 through pipelines, and the following benefits are obtained according to field test data:
1. according to the analysis of the primary and secondary air inlet temperature, the air temperature at the outlet of the air heater and the exhaust gas temperature, when the environmental temperature is 10 ℃, the temperature of the exhaust gas is as follows: the primary air inlet is cut into indoor air, namely a valve 19 at the outdoor primary air inlet 1 is closed, the temperature is increased by 19 ℃ compared with the outdoor air temperature, and the air temperature at the outlet of an air heater a3 is increased by 22.3 ℃; the secondary air inlet is cut into indoor air, namely a valve 19 at the outdoor secondary air inlet 7 is closed, the temperature of the secondary air is increased by 26 ℃ compared with that of the outdoor air, the temperature of the air at the outlet of the air heater b9 is increased by 19.45 ℃, and the temperature of the boiler exhaust smoke is increased by 11.9 ℃. In order to reduce the heat loss of exhaust smoke, the regulating valves 13 at the inlets of the primary fan 2 and the secondary fan 8 are in a half-open state, the temperature of the inlet air of the air preheater is controlled to reach a required value, and secondary air hot air recirculation and the operation of the air heater are not required.
2. According to the comparison between the indoor air input by only a fan and the hot air input for recirculation, when the hot air input for recirculation is input, the electricity consumption of a primary fan and a secondary fan per hour is 1537 KW.h, a hot air recirculation manual valve a17 and a hot air recirculation manual valve b18 are in a half-open state, when the fan is input into the indoor air, the electricity consumption of the primary fan and the secondary fan per hour is 1430 KW.h, the electricity consumption is saved by 107 degrees/h compared with the electricity consumption of the hot air input for recirculation in winter, a 1/2 plugboard needs to be opened in 2 months, and a fully-opened hot air recirculation plugboard needs to be opened in the later 3 months. The total saved electricity is 616320 KW.h, calculated according to the power generation cost of 0.22 yuan, and 13.559 ten thousand yuan is saved all the year round.
3. When indoor air is thrown in winter, a heater is not required to be thrown in any more, the normal flow speed V of a closed system DN50 is recommended to be 0.9m/s according to the pipe diameter flow speed, the flow Q (m3/h) ═ pi × R2 × V × 3600 ═ 3.14 × 2 × 0.9m/s × 3600 ═ 6.3585m3/h, the heater is thrown in winter for 3 months, the total day is 90 days, the total steam consumption is 6.3 × 90 × 24 ═ 13608 tons, the price per ton of steam is 78 yuan/ton, the total saving is 13608 × 0.0078 ═ 106.14 ten thousand yuan, and R is the radius of a pipeline.
4. Cut the fan inlet wind to indoor, reduced the indoor ambient temperature of boiler body.
Claims (7)
1. The pulverized coal fired boiler combining indoor air and outdoor air is characterized by comprising an outdoor primary air inlet (1) and an outdoor secondary air inlet (7) which are communicated with the outside, wherein the outdoor primary air inlet (1) is sequentially connected with a primary fan (2), a fan heater a (3) and a primary air preheater (4) through a pipeline, the outdoor primary air inlet (1) is provided with a silencer a (5), the indoor primary air inlet (6) is arranged above the outdoor primary air inlet (1), the indoor primary air inlet (6) is connected between the outdoor primary air inlet (1) and the primary fan (2) through a pipeline, the outdoor secondary air inlet (7) is sequentially connected with a secondary fan (8), a fan heater b (9) and a secondary air preheater (10) through a pipeline, and the outdoor secondary air inlet (7) is also provided with a silencer b (12), the indoor secondary air inlet (11) is arranged above the outdoor secondary air inlet (7) and is connected between the outdoor secondary air inlet (7) and the secondary fan (8) through a pipeline.
2. The pulverized coal fired boiler combining indoor air and outdoor air according to claim 1, characterized in that the inlet of the primary air blower (2) and the outlet of the primary air preheater (4) are further connected through a hot air recirculation pipeline a (15), and the inlet of the secondary air blower (8) and the outlet of the secondary air preheater (10) are further connected through a hot air recirculation pipeline b (16).
3. The pulverized coal fired boiler combining indoor air and outdoor air according to claim 2, wherein the hot air recirculation duct a (15) and the hot air recirculation duct b (16) are further provided with a hot air recirculation manual valve a (17) and a hot air recirculation manual valve b (18), respectively.
4. The pulverized coal boiler combining indoor air and outdoor air according to claim 1, wherein the elevation of the outdoor primary air inlet (1) and the outdoor secondary air inlet (7) is 10m, and the elevation of the indoor primary air duct inlet (6) and the indoor secondary air duct inlet (11) is 40 m.
5. The pulverized coal fired boiler combining indoor air and outdoor air according to claim 1, characterized in that the inlets of the primary air fan (2) and the secondary air fan (8) are provided with regulating valves (13).
6. The pulverized coal fired boiler combining indoor air and outdoor air according to claim 1, wherein control valves (14) are provided at outlets of the warm air blower a (3) and the warm air blower b (9).
7. The pulverized coal fired boiler combining indoor air and outdoor air according to claim 1, characterized in that valves (19) are arranged at the outdoor primary air inlet (1), the outdoor secondary air inlet (7), the indoor primary air duct inlet (6) and the indoor secondary air duct inlet (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020361890.XU CN212408631U (en) | 2020-03-20 | 2020-03-20 | Pulverized coal fired boiler combining indoor air and outdoor air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020361890.XU CN212408631U (en) | 2020-03-20 | 2020-03-20 | Pulverized coal fired boiler combining indoor air and outdoor air |
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| Publication Number | Publication Date |
|---|---|
| CN212408631U true CN212408631U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020361890.XU Active CN212408631U (en) | 2020-03-20 | 2020-03-20 | Pulverized coal fired boiler combining indoor air and outdoor air |
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| Country | Link |
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| CN (1) | CN212408631U (en) |
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- 2020-03-20 CN CN202020361890.XU patent/CN212408631U/en active Active
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