CN211925807U - System for realizing SCR full-time denitration of coal-fired thermal power generating unit - Google Patents
System for realizing SCR full-time denitration of coal-fired thermal power generating unit Download PDFInfo
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- CN211925807U CN211925807U CN201922002583.2U CN201922002583U CN211925807U CN 211925807 U CN211925807 U CN 211925807U CN 201922002583 U CN201922002583 U CN 201922002583U CN 211925807 U CN211925807 U CN 211925807U
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Abstract
The utility model discloses a system for denitration of coal-fired thermal power unit realization SCR full period belongs to coal-fired thermal power plant flue gas denitration technical field. The utility model discloses aim at solving: when a coal-fired power plant unit is started to carry out powder feeding, low-load peak regulation operation (the load rate is less than or equal to 40 percent generally) and the unit is stopped, the flue gas temperature at the inlet of a denitration System (SCR) is lower than denitration operation temperature, and the denitration system can not be put into operation to remove NOx, namely, the problem of denitration of the unit in the whole period can not be met. The utility model discloses a combustor and supporting system thereof heats the flue gas in the part flue through burning with external fuel (gas or liquid etc.), mixes the high temperature flue gas after will heating again with cold flue gas in the former flue, makes unit start-up, low-load operation and each stage of stopping transport, and denitration entry flue gas temperature all is higher than denitration commissioning requirement temperature, satisfies the requirement of unit full period denitration to satisfy the requirement that unit full period environmental protection (NOx) discharged.
Description
Technical Field
The utility model relates to a system for denitration of coal-fired thermal power unit realization SCR full period belongs to coal-fired thermal power plant flue gas denitration technical field.
Background
In order to meet the requirement of NOx emission concentration of the thermal power generating unit, the thermal power generating unit is provided with an SCR denitration device. The normal working temperature range of the catalyst of the denitration device is 300-420 ℃, and the catalyst cannot play the due role when the temperature exceeds the temperature range. When the unit participates in deep peak regulation (low-load operation), the inlet smoke temperature of the denitration system of the unit is usually lower than 300 ℃, so that the normal operation requirement of the denitration system cannot be met, and the environmental protection index cannot reach the standard.
In 2016, 11 months, an emergency notice is issued by the environmental monitoring bureau of the environmental protection department, and the standard exceeding emission is directly monitored for part of enterprises in major provinces such as Beijing, Tianjin, Hebei, Shandong and Henan provinces, when the concentration mean value of pollutant source automatic monitoring hour data (converted) exceeds the standard, an electronic monitoring list is generated in real time and sent to a local monitoring contact person, and the electronic monitoring list is treated according to regulations such as law regulations, so that the concentration mean value of the pollutant emission hour data (converted) is not standard exceeding when the boiler is operated at low load, and the emission of the boiler is required to reach the standard when the boiler is started, stopped and operated at each load. And during the starting and stopping processes of the coal-fired unit, the flue gas temperature at the SCR inlet is lower during the operation with lower load, and the denitration operation requirement can not be met.
From the current denitration technology condition of the unit under the wide load operation, the denitration technology under the wide load is limited by the temperature rise amplitude, only the problem of the unit under the low load denitration operation can be solved, but the denitration operation starting and stopping requirements can not be met, and based on the reasons, the full-time denitration technology which simultaneously meets the denitration operation conditions under the low load and the start and stop of the SCR is urgently developed.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve coal fired power plant unit and throwing powder, the low-load peak regulation operation (general load factor is less than or equal to 40%) and the overall process that the unit stopped the fortune in the start, the unsatisfied denitration of deNOx Systems (SCR) entry flue gas temperature is put into operation and is required, can't satisfy the problem of unit full period denitration, and then provides a system that coal fired thermal power unit realized the denitration of SCR full period.
The utility model provides a technical scheme that above-mentioned problem adopted is: a system for realizing SCR full-time denitration by a coal-fired thermal power generating unit comprises a boiler original flue, wherein the boiler original flue comprises a unit coal economizer outlet flue and a downstream flue, the unit coal economizer outlet flue is communicated with the downstream flue, and the downstream flue is communicated to a denitration system; the boiler is characterized in that a plurality of bypass pipelines are arranged on the outer side of the unit economizer outlet flue, one end of each bypass pipeline is communicated with the unit economizer outlet flue, a bypass pipeline gate valve is installed at one end of each bypass pipeline, a burner is arranged at the other end of the unit economizer outlet flue, the burner is communicated with an inlet of the combustion chamber, the other end of the unit economizer outlet flue is communicated to an inlet of the combustion chamber, a bypass booster fan is installed in the middle of each bypass pipeline, an outlet of the combustion chamber is communicated with a mixing main pipe, a plurality of mixing inlet flue branch pipes are arranged on the mixing main pipe, and the mixing inlet flue branch pipes are communicated with the unit economizer outlet flue.
Further, the combustion chamber comprises combustion chamber overcoat and interior combustion chamber, interior combustion chamber is located the inside of combustion chamber overcoat, and has the clearance between interior combustion chamber and the combustion chamber overcoat, the several cooling hole has been seted up on the interior combustion chamber, the entry intercommunication of combustor and interior combustion chamber, the export of interior combustion chamber communicates to the inside of combustion chamber overcoat, the entry intercommunication of bypass pipeline and combustion chamber overcoat, the export and the mixed mother pipe intercommunication of combustion chamber overcoat.
Furthermore, the bypass pipelines are symmetrically arranged on two sides of the outlet flue of the unit economizer, and each bypass pipeline is provided with a bypass pipeline gate valve and a bypass booster fan.
Furthermore, the number of the burners is determined by the unit operation flue gas parameters, and the number of the combustion chambers, the bypass pipelines, the bypass pipeline gate valves thereon and the bypass booster fans are all matched with the number of the burners.
Furthermore, the bypass pipeline is communicated to the upper part of an outlet flue of the unit coal economizer, the mixed flue-in branch pipe is communicated to the lower part of the outlet flue of the unit coal economizer, and the number of the mixed flue-in branch pipes is determined by the uniformity of a temperature field at an inlet of the denitration system after the high-temperature flue gas and the original flue gas of the boiler are mixed.
The working method comprises the following steps: in the starting stage of the unit, when the boiler starts to throw powder, the system is put into operation; the original flue gas of the boiler enters the combustion chamber through a bypass pipeline under the action of a bypass supercharging fan, one part of the flue gas entering the combustion chamber enters the inner combustion chamber through a cooling hole to be mixed with high-temperature flue gas generated by combustion fuel of the combustor, the other part of the flue gas entering the combustion chamber flows through a gap between an outer sleeve of the combustion chamber and the inner combustion chamber, and the two parts of the flue gas cool the inner combustion chamber so as to ensure the safety of the inner combustion chamber; the flue gas outside the inner combustion chamber is mixed with the high-temperature flue gas in the inner combustion chamber at the outlet of the inner combustion chamber, so that the temperature of the high-temperature flue gas discharged from the inner combustion chamber after mixing is reduced to be within the material safety temperature of the mixing main pipe, then the flue gas enters the mixing main pipe, the flue gas discharged from different combustion chambers is mixed to the mixing main pipe, then the mixed flue gas is mixed into the original flue of the boiler through the mixing inlet flue branch pipe and is mixed with the cold flue gas in the original flue of the boiler, and the temperature of the mixed SCR inlet flue gas meets the denitration delivery temperature requirement; along with the unit starts, the smoke temperature in the original flue of the boiler is gradually increased, the operation power and the number of the burners are correspondingly reduced, and the system is completely withdrawn until the smoke temperature at the SCR inlet of the boiler can meet the denitration operation requirement. The operation mode of the system is similar for other load sections of the unit.
Compared with the prior art, the utility model, have following advantage and effect: the system adopts the combustor and a supporting system thereof, heats partial flue gas by burning external fuel (light diesel oil or natural gas and the like), mixes the heated high-temperature flue gas with cold flue gas in an original flue, enables the unit to run at low load and stop running at each stage, ensures that the flue gas temperature at a denitration inlet is higher than the denitration commissioning requirement temperature, meets the denitration requirement of the unit at the whole time, and further meets the requirement of the unit on the emission of environmental protection (NOx) at the whole time.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a schematic structural view of a combustion chamber according to an embodiment of the present invention.
FIG. 3 is a comparison of the SCR inlet smoke temperature change curve during the boiler start-up phase when the system is used for heating and the SCR inlet smoke temperature change curve during the original oil feeding start-up.
In the figure: the unit coal economizer comprises an outlet flue 1, a downstream flue 2, a combustor 3, a combustion chamber 4, a bypass pipeline gate valve 5, a bypass pipeline 6, a bypass booster fan 7, a mixing main pipe 8, a mixing inlet flue branch pipe 9, a combustion chamber jacket 10, an inner combustion chamber 11 and a cooling hole 12.
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.
Referring to fig. 1 to 2, the system for realizing SCR full-time denitration by a coal-fired thermal power generating unit in the embodiment includes an original boiler flue, the original boiler flue includes a unit economizer outlet flue 1 and a downstream flue 2, the unit economizer outlet flue 1 is communicated with the downstream flue 2, and the downstream flue 2 is communicated to a denitration system; the outside of unit economizer export flue 1 is provided with a plurality of bypass pipeline 6, the one end and the unit economizer export flue 1 intercommunication of bypass pipeline 6, and bypass pipeline gate valve 5 is installed to the one end of bypass pipeline 6, the other end of unit economizer export flue 1 is provided with combustor 3, combustor 3 and combustion chamber 4's entry intercommunication, the other end of unit economizer export flue 1 communicates to the entrance of combustion chamber 4, bypass booster fan 7 is installed at the mid-mounting of bypass pipeline 6, the export and the mixed mother pipe 8 intercommunication of combustion chamber 4, be provided with many on the mixed mother pipe 8 and mix into flue branch pipe 9, it communicates with unit economizer export flue 1 to mix into flue branch pipe 9.
The combustion chamber 4 comprises combustion chamber overcoat 10 and interior combustion chamber 11, interior combustion chamber 11 is located the inside of combustion chamber overcoat 10, and have the clearance between interior combustion chamber 11 and the combustion chamber overcoat 10, set up the cooling hole 12 of several fish scale form on the interior combustion chamber 11, combustor 3 communicates with the entry of interior combustion chamber 11, the export of interior combustion chamber 11 communicates to the inside of combustion chamber overcoat 10, bypass pipeline 6 communicates with the entry of combustion chamber overcoat 10, the export and the mixed mother pipe 8 intercommunication of combustion chamber overcoat 10.
The bypass pipelines 6 are symmetrically arranged on two sides of the outlet flue 1 of the unit economizer, and each bypass pipeline 6 is provided with a set of bypass pipeline gate valve 5 and a bypass booster fan 7.
The number of the combustion engines 3 is determined by the unit operation smoke parameters, and the number of the combustion chambers 4, the bypass pipelines 6, the bypass pipeline gate valves 5 on the bypass pipelines and the bypass booster fans 7 is matched with the number of the combustion engines 3.
The bypass pipeline 6 is communicated to the upper part of the outlet flue 1 of the unit coal economizer, the mixed-in flue branch pipe 9 is communicated to the lower part of the outlet flue 1 of the unit coal economizer, and the number of the mixed-in flue branch pipes 9 is determined by the uniformity of the inlet temperature field of the denitration system after the high-temperature flue gas and the original flue gas of the boiler are mixed.
The working method comprises the following steps: in the starting stage of the unit, when the boiler starts to throw powder, the system is put into operation; the original flue gas of the boiler enters the combustion chamber 4 through the bypass pipeline 6 under the action of the bypass booster fan 7, one part of the gas entering the combustion chamber 4 enters the inner combustion chamber 11 through the cooling hole 12 to be mixed with high-temperature gas generated by burning fuel by the burner 3, the other part of the gas entering the combustion chamber 4 flows through a gap between the combustion chamber jacket 10 and the inner combustion chamber 11, and the two parts of the gas play a role of cooling the inner combustion chamber 11 so as to ensure the safety of the inner combustion chamber 11; the flue gas outside the inner combustion chamber 11 is mixed with the high-temperature flue gas in the inner combustion chamber 11 at the outlet of the inner combustion chamber 11, so that the temperature of the high-temperature flue gas discharged from the mixed inner combustion chamber 11 is reduced to be within the material safety temperature of the mixing main pipe 8, then the flue gas enters the mixing main pipe 8, the flue gas discharged from different combustion chambers 4 is mixed to the mixing main pipe 8, then the mixed flue gas is mixed into the original flue of the boiler through the mixing inlet flue branch pipe 9 and is mixed with the cold flue gas in the original flue of the boiler, and the temperature of the mixed SCR inlet flue gas meets the denitration delivery temperature requirement; along with the unit starts, the smoke temperature in the original flue of the boiler is gradually increased, the operation power and the number of the burners 3 are correspondingly reduced, and the system is completely withdrawn until the smoke temperature at the SCR inlet of the boiler can meet the denitration operation requirement. The operation mode of the system is similar for other load sections of the unit.
Those not described in detail in this specification are well within the skill of the art.
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 (5)
1. A system for realizing SCR full-time denitration by a coal-fired thermal power generating unit comprises an original boiler flue, wherein the original boiler flue comprises a unit coal economizer outlet flue (1) and a downstream flue (2), the unit coal economizer outlet flue (1) is communicated with the downstream flue (2), and the downstream flue (2) is communicated to a denitration system; it is characterized in that a plurality of bypass pipelines (6) are arranged outside the outlet flue (1) of the unit coal economizer, one end of the bypass pipeline (6) is communicated with an outlet flue (1) of the unit coal economizer, and one end of the bypass pipeline (6) is provided with a bypass pipeline gate valve (5), the other end of the unit economizer outlet flue (1) is provided with a burner (3), the combustor (3) is communicated with the inlet of the combustion chamber (4), the other end of the unit economizer outlet flue (1) is communicated with the inlet of the combustion chamber (4), a bypass booster fan (7) is arranged in the middle of the bypass pipeline (6), the outlet of the combustion chamber (4) is communicated with a mixing main pipe (8), a plurality of mixing inlet flue branch pipes (9) are arranged on the mixing main pipe (8), the mixed inlet flue branch pipe (9) is communicated with an outlet flue (1) of the unit coal economizer.
2. The system for realizing SCR full-time denitration by a coal-fired thermal power generating unit according to claim 1, wherein the combustion chamber (4) is composed of a combustion chamber outer sleeve (10) and an inner combustion chamber (11), the inner combustion chamber (11) is positioned inside the combustion chamber outer sleeve (10), a gap is formed between the inner combustion chamber (11) and the combustion chamber outer sleeve (10), a plurality of cooling holes (12) are formed in the inner combustion chamber (11), the combustor (3) is communicated with an inlet of the inner combustion chamber (11), an outlet of the inner combustion chamber (11) is communicated to the inside of the combustion chamber outer sleeve (10), the bypass pipeline (6) is communicated with an inlet of the combustion chamber outer sleeve (10), and an outlet of the combustion chamber outer sleeve (10) is communicated with the mixing main pipe (8).
3. The system for realizing SCR full-time denitration by a coal-fired thermal power generating unit according to claim 1, wherein the bypass pipelines (6) are symmetrically arranged on two sides of the outlet flue (1) of the unit coal economizer, and each bypass pipeline (6) is provided with a bypass pipeline gate valve (5) and a bypass booster fan (7).
4. The system for realizing SCR full-time denitration by a coal-fired thermal power generating unit according to claim 1, wherein the number of the burners (3) is determined by unit operation flue gas parameters, and the number of the combustion chambers (4), the bypass pipelines (6) and the bypass pipeline gate valves (5) and the bypass booster fans (7) thereon are matched with the number of the burners (3).
5. The system for realizing SCR full-time denitration by a coal-fired thermal power generating unit as claimed in claim 1, wherein the bypass pipeline (6) is communicated to the upper part of the unit coal economizer outlet flue (1), the mixed flue-in branch pipe (9) is communicated to the lower part of the unit coal economizer outlet flue (1), and the number of the mixed flue-in branch pipes (9) is determined by the uniformity of the inlet temperature field of the denitration system after high-temperature flue gas and the original flue gas of the boiler are mixed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922002583.2U CN211925807U (en) | 2019-11-19 | 2019-11-19 | System for realizing SCR full-time denitration of coal-fired thermal power generating unit |
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| CN201922002583.2U CN211925807U (en) | 2019-11-19 | 2019-11-19 | System for realizing SCR full-time denitration of coal-fired thermal power generating unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111043620A (en) * | 2019-11-19 | 2020-04-21 | 华电电力科学研究院有限公司 | System and method for realizing SCR full-time denitration of coal-fired thermal power generating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111043620A (en) * | 2019-11-19 | 2020-04-21 | 华电电力科学研究院有限公司 | System and method for realizing SCR full-time denitration of coal-fired thermal power generating unit |
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