CN218154187U - SCR deNOx systems's gas temperature governing system - Google Patents
SCR deNOx systems's gas temperature governing system Download PDFInfo
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- CN218154187U CN218154187U CN202221915801.7U CN202221915801U CN218154187U CN 218154187 U CN218154187 U CN 218154187U CN 202221915801 U CN202221915801 U CN 202221915801U CN 218154187 U CN218154187 U CN 218154187U
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Abstract
The utility model discloses a flue gas temperature governing system of SCR deNOx systems, including middle warehouse style powder process system, middle warehouse style powder process system connects and switches on hot primary air pipeline and tertiary air pipeline respectively, and hot primary air pipeline connects and switches on the air heater of primary air mechanism, and tertiary air pipeline connects and switches on the ventilation air spout in the boiler furnace, still includes the natural gas line, and natural gas line one end is connected and switches on the external air supply, and the other end of the natural gas line connects and switches on hot primary air bypass pipeline; the hot primary air bypass pipeline is connected and communicated with the tertiary air pipeline at the position of the outlet of the powder discharge fan; the hot primary air bypass pipeline is connected and communicated with the hot primary air pipeline. The utility model discloses with the hot primary air of some high temperature through the natural gas of hot primary air bypass pipeline with natural gas line internal input in advance, then introduced tertiary air pipeline and tertiary air and mix, send into furnace on the boiler through the ventilation air methane spout at last and burn.
Description
Technical Field
The utility model relates to a SCR deNOx systems's gas temperature governing system especially relates to an adopt SCR deNOx systems gas temperature governing system of tertiary air spout afterburning under low-load, belongs to the coal fired boiler field.
Background
The scale of new energy power generation is continuously increased, and the coal-fired unit faces a long-period low-load deep peak regulation situation. The inlet smoke temperature is low in a low-load selective catalytic reduction (hereinafter, referred to as SCR) system, and the lower limit of the design smoke temperature of the catalyst is often set.
The coal-fired power plant adopting the intermediate storage type pulverizing system is designed to be generally poor-burnout coal such as lean coal and anthracite. The prior large-scale operation of the units has poor burnout, serious high fly ash carbon content, low boiler combustion efficiency and NO X And the emission of pollutants such as CO exceeds the standard, and the like, particularly, a low-load deep peak regulation policy is implemented at present, the smoke temperature at the inlet of the SCR system is lower under low load, and the lower limit of the smoke temperature is often designed in the presence of a catalyst.
The coal is dried and ground in the coal mill, the hot air introduced into the coal mill dries the coal and sends out the pulverized coal, and the pulverized coal reaches the pulverized coal bin through the coarse powder separator and the fine powder separator along with the air flow. The fines separator separates the coal fines from the air stream and stores them in a coal dust bin, and the separated air stream containing about 5% coal fines is called tertiary air (ventilation air). The tertiary air enters the upper part of the boiler furnace through the pressurization of the powder discharge fan. The pulverized coal is stored in a pulverized coal bin, and then is fed into a boiler hearth by hot air from the pulverized coal bin according to the load requirement.
In the existing intermediate storage type pulverizing system, the air temperature of tertiary air separated by a fine powder separator is lower by about 90 ℃, and coal with larger water content for combustion and a low-load working condition are lower. The low-temperature tertiary air carrying about 5 percent of the total pulverized coal quantity has great influence on the combustion efficiency of the boiler, because the tertiary air is at the uppermost part of the hearth and is close to the outlet of the hearth, the smoke temperature of the area is low, the path of the pulverized coal is short, the combustion is insufficient, the carbon content of fly ash is high, and the tertiary air with low air temperature increases the ignition heat of the pulverized coal and also aggravates the insufficient combustion.
Therefore, it is an urgent problem to improve the inlet smoke temperature of the SCR system at low load by which method.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: how to increase the inlet smoke temperature of the SCR system under low load.
In order to solve the technical problem, the technical scheme of the utility model provides a flue gas temperature governing system of SCR deNOx systems, including middle warehouse style powder process system, middle warehouse style powder process system connects and switches on hot primary air pipeline and tertiary air pipeline respectively, and hot primary air pipeline connects and switches on the air heater of primary air mechanism, and tertiary air pipeline connects and switches on the ventilation air spout in the boiler furnace, and its characterized in that still includes the natural gas line, natural gas line one end connect and switch on the external air supply, and the natural gas line other end connects and switches on hot primary air bypass pipeline; the hot primary air bypass pipeline is connected and communicated with the tertiary air pipeline at the position of the outlet of the powder discharge fan; the hot primary air bypass pipeline is connected and communicated with the hot primary air pipeline.
Preferably, the hot primary air bypass pipeline is provided with a damper; the damper is located between the joint of the natural gas pipeline and the hot primary air bypass pipeline and the joint of the hot primary air bypass pipeline and the hot primary air pipeline.
Preferably, the natural gas pipeline is provided with a regulating valve.
Preferably, the damper and the regulating valve are both connected with a control system.
Preferably, the opening degrees of the damper and the regulating valve are linearly regulated by the control system according to the variation amplitude of the inlet flue gas temperature of the SCR system respectively.
Preferably, the primary air mechanism further comprises a fan, a cold primary air pipeline and an air preheater, and an outlet of the fan is connected with and communicated with the hot primary air pipeline through the air preheater.
Preferably, the outer walls of the tertiary air pipeline, the hot primary air bypass pipeline and the hot primary air pipeline are all coated with heat insulation material layers.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses increased hot primary air bypass pipeline on original primary air mechanism, with the hot primary air of a part high temperature through the natural gas of hot primary air bypass pipeline with natural gas line in the input in advance, then introduced tertiary air pipeline and tertiary air and mix, send into furnace on the boiler through the ventilation air vent spout at last and burn.
The utility model discloses introduce tertiary air pipeline with the hot primary air of some high temperature and natural gas, improved the proportion of tertiary air, optimized the furnace air distribution, not only be favorable to promoting buggy smoke and wind to mix, make furnace's burning stronger to reduce flying dust carbon content, improve boiler combustion efficiency, the rising of tertiary air proportion has promoted the air degree of depth in the furnace in addition and has hierarchical, is favorable to reducing NO X And (4) discharging.
The utility model discloses can realize the purpose that SCR system entry gas temperature adjusted, guarantee that SCR denitrification facility is still the low-load can all be put into operation at high load, accomplish high-efficient low pollution.
The utility model discloses need not reform transform around the water-cooling wall to furnace separately and add natural gas combustor and corresponding pipeline, can directly set up on current primary air mechanism, hot primary air bypass pipeline and tertiary air pipeline, simple structure, the cost is low in the setting, has good practical value.
Drawings
FIG. 1 is a schematic view of a flue gas temperature regulation system of an SCR denitration system;
FIG. 2 is a block diagram of the control system controlling the damper and damper openings.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The utility model provides a SCR deNOx systems's gas temperature governing system, as shown in figure 1, it includes middle storage formula powder process system 1, wind mechanism 2, row's powder fan 10, tertiary air pipeline 3, hot primary air bypass pipeline 4, natural gas line 5. Middle warehouse style powder process system 1 connects respectively and switches on hot primary air pipeline 24 and tertiary air pipeline 3, and hot primary air pipeline 24 connects and switches on air heater 23 of primary air mechanism 2, and external air source is connected and switched on to 5 one end of natural gas line, and hot primary air bypass pipeline 4 is connected and switched on to the other end. The hot primary air bypass pipeline 4 is connected and communicated with a tertiary air pipeline 3 behind the powder discharge fan 10 (namely the outlet end of the powder discharge fan 10 or positioned on one side of the powder discharge fan 10 far away from the intermediate storage type pulverizing system 1), and the tertiary air pipeline 3 is connected and communicated with an exhaust air nozzle 9 in a boiler hearth 8. The hot primary air bypass pipeline 4 is connected and communicated with the hot primary air pipeline 24.
The natural gas pipeline 5 is provided with an adjusting valve 7; the hot primary air bypass pipeline 4 is provided with an air damper 6, and the air damper 6 is positioned between the joint of the natural gas pipeline 5 and the hot primary air bypass pipeline 4 and the joint of the hot primary air bypass pipeline 4 and the hot primary air pipeline 24.
The damper 6 and the damper 7 are controlled by a control system; the opening degrees of the damper 6 and the damper 7 can be adjusted linearly according to the variation range of the inlet flue gas temperature of the SCR system, as shown in FIG. 2. Namely, after the data of the flue gas temperature is transmitted to the control system, the control system sends out an instruction to adjust the opening degree of the air adjusting door 6 and the air adjusting valve 7.
The primary air mechanism 2 further comprises a fan 22, a cold primary air pipeline 21 and an air preheater 23, and an outlet of the fan 22 is connected with and communicated with a hot primary air pipeline 24 through the air preheater 23.
The outer walls of the tertiary air pipeline 3, the hot primary air bypass pipeline 4 and the hot primary air pipeline 24 are coated with heat insulation material layers.
The working principle of the utility model is as follows:
the cold primary air at the outlet of the fan 22 is heated by the air preheater 23 to generate hot primary air. One part of hot primary air at the outlet of the air preheater 23 enters the intermediate storage type powder making system 1 through the hot primary air pipeline 24 for powder making, the other part of hot primary air is premixed with natural gas in the natural gas pipeline 5 accessed after passing through the regulation of the regulating air door 6 through the hot primary air bypass pipeline 4 connected to the hot primary air pipeline 24, and then enters the tertiary air pipeline 3 to be mixed with tertiary air (ventilation air) in the tertiary air pipeline 3 and then enters the boiler hearth 8 through the ventilation air nozzle 7 to participate in combustion. And the natural gas amount and the bypass hot primary air amount are subjected to system control according to the inlet smoke temperature of the SCR system.
In the embodiment, the hot primary air and the natural gas are mixed into the tertiary air, so that on one hand, the proportion of the tertiary air is improved,the air distribution of the hearth is optimized, the mixing of pulverized coal and smoke is promoted, the combustion of the hearth is stronger, the carbon content of fly ash is reduced, the combustion efficiency of a boiler is improved, the air depth grading in the hearth is promoted by the rising of the proportion of tertiary air, and the reduction of NO is facilitated X The purposes of improving the running economy and environmental protection of the unit are finally achieved. On the other hand, the purpose of regulating the inlet smoke temperature of the SCR system can be realized through the afterburning effect of the natural gas on the upper part of the hearth, the SCR denitration device can be operated under high load or low load, and high efficiency and low pollution are realized.
Claims (7)
1. A smoke temperature adjusting system of an SCR denitration system comprises a middle storage type powder making system (1), wherein the middle storage type powder making system (1) is respectively connected and communicated with a hot primary air pipeline (24) and a tertiary air pipeline (3), the hot primary air pipeline (24) is connected and communicated with an air preheater (23) of a primary air mechanism (2), the tertiary air pipeline (3) is connected and communicated with an exhaust air nozzle (9) in a boiler hearth (8), the smoke temperature adjusting system is characterized by also comprising a natural gas pipeline (5), one end of the natural gas pipeline (5) is connected and communicated with an external gas source, and the other end of the natural gas pipeline (5) is connected and communicated with a hot primary air bypass pipeline (4); the hot primary air bypass pipeline (4) is connected and communicated with the tertiary air pipeline (3) and is positioned at the outlet of the powder discharge fan (10); the hot primary air bypass pipeline (4) is connected and communicated with the hot primary air pipeline (24).
2. The flue gas temperature adjusting system of the SCR denitration system as set forth in claim 1, wherein a damper (6) is provided on the hot primary air bypass duct (4); the damper (6) is positioned between the joint of the natural gas pipeline (5) and the hot primary air bypass pipeline (4) and the joint of the hot primary air bypass pipeline (4) and the hot primary air pipeline (24).
3. The flue gas temperature regulating system of the SCR denitration system of claim 2, wherein the natural gas pipeline (5) is provided with a regulating valve (7).
4. The flue gas temperature adjusting system of the SCR denitration system as set forth in claim 3, wherein said damper (6) and said damper (7) are connected to a control system.
5. The flue gas temperature adjusting system of the SCR denitration system as set forth in claim 4, wherein the opening degrees of the damper (6) and the damper (7) are linearly adjusted by the control system according to the variation range of the inlet flue gas temperature of the SCR system, respectively.
6. The flue gas temperature adjusting system of the SCR denitration system of claim 1, wherein the primary air mechanism (2) further comprises a fan (22), a cold primary air pipeline (21) and an air preheater (23), and an outlet of the fan (22) is connected with the hot primary air pipeline (24) through the air preheater (23).
7. The system for regulating the flue gas temperature of the SCR denitration system according to claim 1, wherein the outer walls of the tertiary air duct (3), the hot primary air bypass duct (4) and the hot primary air duct (24) are coated with a thermal insulation material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221915801.7U CN218154187U (en) | 2022-07-22 | 2022-07-22 | SCR deNOx systems's gas temperature governing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221915801.7U CN218154187U (en) | 2022-07-22 | 2022-07-22 | SCR deNOx systems's gas temperature governing system |
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| CN218154187U true CN218154187U (en) | 2022-12-27 |
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| CN202221915801.7U Active CN218154187U (en) | 2022-07-22 | 2022-07-22 | SCR deNOx systems's gas temperature governing system |
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- 2022-07-22 CN CN202221915801.7U patent/CN218154187U/en active Active
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