CN110314544B - Ammonia gas flow control method, equipment, storage medium and device - Google Patents

Ammonia gas flow control method, equipment, storage medium and device Download PDF

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CN110314544B
CN110314544B CN201910601903.8A CN201910601903A CN110314544B CN 110314544 B CN110314544 B CN 110314544B CN 201910601903 A CN201910601903 A CN 201910601903A CN 110314544 B CN110314544 B CN 110314544B
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ammonia
nitrogen oxide
content
value
spraying pipeline
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CN110314544A (en
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易小尧
吴三寅
成连杰
戴石新
李强
程康
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China Resources Power Hubei Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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Abstract

The invention discloses a method, equipment, a storage medium and a device for controlling ammonia flow, which are used for obtaining the content of a second oxynitride at a second flue gas inlet in a coal-fired unit and the content of a third oxynitride at an environment-friendly discharge outlet in the coal-fired unit by obtaining the content of a first oxynitride at a first flue gas inlet in the coal-fired unit, determining a target ammonia flow of an ammonia spraying pipeline to be adjusted and the ammonia spraying pipeline to be adjusted in the coal-fired unit based on the content of the first oxynitride, the content of the second oxynitride and the content of the third oxynitride, prejudging the content trend of the oxynitride in the whole system based on the content of the oxynitride at two flue gas inlets and the content of the oxynitride at the environment-friendly discharge outlet, determining the target ammonia flow of the ammonia spraying pipeline to be adjusted and advancing the control of the ammonia flow, the air pollution caused by the emission of a large amount of nitrogen oxides into the air is avoided.

Description

Ammonia gas flow control method, equipment, storage medium and device
Technical Field
The invention relates to the technical field of denitration, in particular to a method, equipment, a storage medium and a device for controlling ammonia gas flow.
Background
A Selective Catalytic Reduction (SCR) system of a coal-fired unit comprises two sides A/B, and flue gas of coal-fired unit after high-temperature combustion generates a large amount of nitrogen oxides (including NO and NO)2And NOxEtc.) under the action of the catalyst, the ammonia gas and the nitrogen oxide react to form nitrogen and water, thereby greatly reducing the nitrogen oxide in the flue gas and reaching the environmental-friendly emission standard. However, in the SCR system, the incomplete reaction and the overproof environmental-friendly emission can be caused by too little ammonia spraying, and when the ammonia spraying is excessive, the air preheater is blocked by the generated ammonium nitrate and ammonium nitrite, so that the heat exchange efficiency of the air preheater and the normal work of a boiler are influenced. How to reasonably control the ammonia injection flow so as to stabilize the discharge amount of nitrogen oxides is a problem to be solved urgently.
Ammonia gets into SCR reactor and flue gas catalytic reaction through spouting the ammonia pipeline, and reaction product reachs the denitration mouth, carries out sample detection again, probably needs 1 ~ 2 minutes, and reaction product reachs the environmental protection discharge port, carries out sample detection again, probably needs 5 minutes, no matter in which export, carries out sample detection, detecting nitrogen oxide content and exceeding standard, carries out the control of ammonia flow again, has all caused certain pollution to the air.
Disclosure of Invention
The invention mainly aims to provide a method, equipment, a storage medium and a device for controlling the flow of ammonia gas, and aims to solve the technical problem that the control of the flow of ammonia gas is too lagged in an SCR system.
In order to achieve the above object, the present invention provides a method for controlling the flow rate of ammonia gas, comprising the steps of:
acquiring the content of a first nitrogen oxide at a first flue gas inlet in a coal-fired unit, acquiring the content of a second nitrogen oxide at a second flue gas inlet in the coal-fired unit, and acquiring the content of a third nitrogen oxide at an environment-friendly discharge port in the coal-fired unit;
and determining an ammonia spraying pipeline to be adjusted in the coal-fired unit and a target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content.
Preferably, the determining the ammonia injection pipeline to be adjusted in the coal-fired unit and the target ammonia flow rate of the ammonia injection pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content specifically includes:
determining a first acceleration value corresponding to the first nitrogen oxide content, determining a second acceleration value corresponding to the second nitrogen oxide content, and determining a third acceleration value corresponding to the third nitrogen oxide content;
when the first acceleration value exceeds a preset acceleration value, taking a first ammonia spraying pipeline corresponding to the first flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a first correction value, determining a first ammonia gas flow of the first ammonia spraying pipeline based on the first correction value, and taking the first ammonia gas flow as the target ammonia gas flow;
when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a second correction value, determining a second ammonia flow rate of the second ammonia spraying pipeline based on the second correction value, and taking the second ammonia flow rate as the target ammonia flow rate;
and when the third acceleration value exceeds a preset acceleration value, taking the first ammonia spraying pipeline and the second ammonia spraying pipeline as ammonia spraying pipelines to be adjusted to generate a third correction value, determining a third ammonia flow of the first ammonia spraying pipeline and a fourth ammonia flow of the second ammonia spraying pipeline based on the third correction value, taking the third ammonia flow as a target ammonia flow of the first ammonia spraying pipeline, and taking the fourth ammonia flow as a target ammonia flow of the second ammonia spraying pipeline.
Preferably, after determining the ammonia injection pipeline to be adjusted in the coal-fired unit and the target ammonia flow rate of the ammonia injection pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, the method further comprises the following steps:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet, the content of a fifth nitrogen oxide at a second flue gas outlet and the current content of a third nitrogen oxide in a coal-fired unit;
comparing the fourth nitrogen oxide content with a first preset content value, comparing the fifth oxide content with a second preset content value, and comparing the current third nitrogen oxide content with a third preset content value;
when the content of the fourth nitrogen oxide exceeds a first preset content value, generating a fourth correction value, and adjusting the current ammonia gas flow of the first ammonia spraying pipeline based on the fourth correction value;
generating a fifth correction value when the content of the fifth nitrogen oxide exceeds a second preset content value, and adjusting the current ammonia gas flow of the second ammonia spraying pipeline based on the fifth correction value;
and generating a sixth correction value when the content of the current third nitrogen oxide exceeds a third preset content value, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the sixth correction value.
Preferably, after comparing the fourth nitrogen oxide content with a first preset content value, comparing the fifth oxide content with a second preset content value, and comparing the current third nitrogen oxide content with a third preset content value, the method further includes:
when the fourth nitrogen oxide content does not exceed the first preset content value, the fourth nitrogen oxide content does not exceed a second preset content value, and the current third nitrogen oxide content does not exceed a third preset content value;
determining a fourth acceleration value corresponding to the fourth nitrogen oxide content and a fifth acceleration value corresponding to the fifth nitrogen oxide content;
generating a seventh correction value when the fourth acceleration value exceeds a preset acceleration value, and adjusting the current ammonia gas flow of the first ammonia gas pipeline based on the seventh correction value;
and when the fifth acceleration value exceeds a preset acceleration value, generating an eighth correction value, and adjusting the current ammonia gas flow of the second ammonia gas pipeline based on the eighth correction value.
Preferably, after determining the ammonia injection pipeline to be adjusted in the coal-fired unit and the target ammonia flow rate of the ammonia injection pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, the method further comprises the following steps:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet and the content of a fifth nitrogen oxide at a second flue gas outlet in the coal-fired unit;
and when the difference value of the fourth nitrogen oxide content and the fifth nitrogen oxide content exceeds a preset threshold value, adjusting the current ammonia gas flow of the first spray pipe pipeline and the second spray pipe pipeline.
Preferably, after determining the ammonia injection pipeline to be adjusted in the coal-fired unit and the target ammonia flow rate of the ammonia injection pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, the method further comprises the following steps:
monitoring the load information of the coal-fired unit;
and when the load information changes, generating a ninth correction value based on a preset rule, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the ninth correction value.
Preferably, after determining the ammonia injection pipeline to be adjusted in the coal-fired unit and the target ammonia flow rate of the ammonia injection pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, the method further comprises the following steps:
acquiring the working state information of a coal mill of the coal-fired unit;
and generating a tenth correction value when the working state information of the coal mill meets a preset condition, and adjusting the current ammonia flow of the first ammonia injection pipeline and the current ammonia flow of the second ammonia injection pipeline based on the tenth correction value.
Further, to achieve the above object, the present invention also provides an ammonia gas flow rate control apparatus comprising: a memory, a processor and a control program of ammonia gas flow stored on the memory and operable on the processor, the control program of ammonia gas flow being executed by the processor to implement the steps of the method of ammonia gas flow control as described above.
In addition, in order to achieve the above object, the present invention also provides a storage medium having stored thereon a control program of an ammonia gas flow rate, the control program of the ammonia gas flow rate realizing the steps of the method of controlling an ammonia gas flow rate as described above when executed by a processor.
In order to achieve the above object, the present invention also provides an ammonia gas flow rate control device, including:
the acquisition module is used for acquiring the content of a first nitrogen oxide at a first flue gas inlet in the coal-fired unit, acquiring the content of a second nitrogen oxide at a second flue gas inlet in the coal-fired unit and acquiring the content of a third nitrogen oxide at an environment-friendly discharge port in the coal-fired unit;
and the adjusting module is used for determining the ammonia spraying pipeline to be adjusted in the coal-fired unit and the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content.
In the invention, the content of the second nitric oxide at the second flue gas inlet in the coal-fired unit is obtained by obtaining the content of the first nitric oxide at the first flue gas inlet in the coal-fired unit, and obtaining the third nitrogen oxide content of the environment-friendly discharge port in the coal-fired unit, determining the ammonia spraying pipeline to be adjusted in the coal-fired unit and the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, and determining the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the nitrogen oxide content of the two flue gas inlets and the nitrogen oxide content of the environment-friendly discharge port, the content trend of the nitrogen oxides in the whole system is pre-judged, so that the ammonia spraying pipeline to be adjusted and the target ammonia flow of the ammonia spraying pipeline to be adjusted are determined, the control of the flow of the ammonia gas is advanced, and air pollution caused by the emission of a large amount of nitrogen oxides to the air is avoided.
Drawings
FIG. 1 is a schematic diagram of an apparatus architecture of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of the ammonia gas flow rate control method according to the present invention;
FIG. 3 is a schematic flow chart of a method for controlling the flow of ammonia gas according to a second embodiment of the present invention;
FIG. 4 is a functional block diagram of a first embodiment of the ammonia gas flow rate control apparatus according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the apparatus may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may comprise a Display screen (Display), and the optional user interface 1003 may also comprise a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., a Wi-Fi interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage server separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the ammonia gas flow control device and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005 as a storage medium may include an operating device, a network communication module, a user interface module, and a control program of the flow rate of ammonia gas.
In the device shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting user equipment; the apparatus calls a control program of the ammonia gas flow rate stored in the memory 1005 by the processor 1001 and executes the method of controlling the ammonia gas flow rate provided by the embodiment of the present invention.
The apparatus calls up, by the processor 1001, a control program of the flow rate of ammonia gas stored in the memory 1005, and performs the following operations:
acquiring the content of a first nitrogen oxide at a first flue gas inlet in a coal-fired unit, acquiring the content of a second nitrogen oxide at a second flue gas inlet in the coal-fired unit, and acquiring the content of a third nitrogen oxide at an environment-friendly discharge port in the coal-fired unit;
and determining an ammonia spraying pipeline to be adjusted in the coal-fired unit and a target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content.
Further, the processor 1001 may call the control program of the flow rate of ammonia gas stored in the memory 1005, and also perform the following operations:
determining a first acceleration value corresponding to the first nitrogen oxide content, determining a second acceleration value corresponding to the second nitrogen oxide content, and determining a third acceleration value corresponding to the third nitrogen oxide content;
when the first acceleration value exceeds a preset acceleration value, taking a first ammonia spraying pipeline corresponding to the first flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a first correction value, determining a first ammonia gas flow of the first ammonia spraying pipeline based on the first correction value, and taking the first ammonia gas flow as the target ammonia gas flow;
when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a second correction value, determining a second ammonia flow rate of the second ammonia spraying pipeline based on the second correction value, and taking the second ammonia flow rate as the target ammonia flow rate;
and when the third acceleration value exceeds a preset acceleration value, taking the first ammonia spraying pipeline and the second ammonia spraying pipeline as ammonia spraying pipelines to be adjusted to generate a third correction value, determining a third ammonia flow of the first ammonia spraying pipeline and a fourth ammonia flow of the second ammonia spraying pipeline based on the third correction value, taking the third ammonia flow as a target ammonia flow of the first ammonia spraying pipeline, and taking the fourth ammonia flow as a target ammonia flow of the second ammonia spraying pipeline.
Further, the processor 1001 may call the control program of the flow rate of ammonia gas stored in the memory 1005, and also perform the following operations:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet, the content of a fifth nitrogen oxide at a second flue gas outlet and the current content of a third nitrogen oxide in a coal-fired unit;
comparing the fourth nitrogen oxide content with a first preset content value, comparing the fifth oxide content with a second preset content value, and comparing the current third nitrogen oxide content with a third preset content value;
when the content of the fourth nitrogen oxide exceeds a first preset content value, generating a fourth correction value, and adjusting the current ammonia gas flow of the first ammonia spraying pipeline based on the fourth correction value;
generating a fifth correction value when the content of the fifth nitrogen oxide exceeds a second preset content value, and adjusting the current ammonia gas flow of the second ammonia spraying pipeline based on the fifth correction value;
and generating a sixth correction value when the content of the current third nitrogen oxide exceeds a third preset content value, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the sixth correction value.
Further, the processor 1001 may call the control program of the flow rate of ammonia gas stored in the memory 1005, and also perform the following operations:
when the fourth nitrogen oxide content does not exceed the first preset content value, the fourth nitrogen oxide content does not exceed a second preset content value, and the third nitrogen oxide content does not exceed a third preset content value;
determining a fourth acceleration value corresponding to the fourth nitrogen oxide content and a fifth acceleration value corresponding to the fifth nitrogen oxide content;
generating a seventh correction value when the fourth acceleration value exceeds a preset acceleration value, and adjusting the current ammonia gas flow of the first ammonia gas pipeline based on the seventh correction value;
and when the fifth acceleration value exceeds a preset acceleration value, generating an eighth correction value, and adjusting the current ammonia gas flow of the second ammonia gas pipeline based on the eighth correction value.
Further, the processor 1001 may call the control program of the flow rate of ammonia gas stored in the memory 1005, and also perform the following operations:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet and the content of a fifth nitrogen oxide at a second flue gas outlet in the coal-fired unit;
and when the difference value of the fourth nitrogen oxide content and the fifth nitrogen oxide content exceeds a preset threshold value, adjusting the current ammonia gas flow of the first spray pipe pipeline and the second spray pipe pipeline.
Further, the processor 1001 may call the control program of the flow rate of ammonia gas stored in the memory 1005, and also perform the following operations:
monitoring the load information of the coal-fired unit;
and when the load information changes, generating a ninth correction value based on a preset rule, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the ninth correction value.
Further, the processor 1001 may call the control program of the flow rate of ammonia gas stored in the memory 1005, and also perform the following operations:
acquiring the working state information of a coal mill of the coal-fired unit;
and generating a tenth correction value when the working state information of the coal mill meets a preset condition, and adjusting the current ammonia flow of the first ammonia injection pipeline and the current ammonia flow of the second ammonia injection pipeline based on the tenth correction value.
In the embodiment, the first nitrogen oxide content of the first flue gas inlet in the coal-fired unit is obtained, the second nitrogen oxide content of the second flue gas inlet in the coal-fired unit is obtained, and obtaining the third nitrogen oxide content of the environment-friendly discharge port in the coal-fired unit, determining the ammonia spraying pipeline to be adjusted in the coal-fired unit and the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, and determining the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the nitrogen oxide content of the two flue gas inlets and the nitrogen oxide content of the environment-friendly discharge port, the content trend of the nitrogen oxides in the whole system is pre-judged, so that the ammonia spraying pipeline to be adjusted and the target ammonia flow of the ammonia spraying pipeline to be adjusted are determined, the control of the flow of the ammonia gas is advanced, and air pollution caused by the emission of a large amount of nitrogen oxides to the air is avoided.
Based on the hardware structure, the embodiment of the ammonia gas flow control method is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the ammonia gas flow control method according to the present invention.
In a first embodiment, the method for controlling the flow rate of ammonia gas comprises the following steps:
step S10: the method comprises the steps of obtaining the content of a first nitrogen oxide at a first flue gas inlet in a coal-fired unit, obtaining the content of a second nitrogen oxide at a second flue gas inlet in the coal-fired unit, and obtaining the content of a third nitrogen oxide at an environment-friendly discharge outlet in the coal-fired unit.
It is to be understood that "first" in "first oxynitride," and "second" in "second oxynitride," and "third" in "third oxynitride" in this embodiment do not constitute any limitation on the oxynitride, and the composition of the oxynitride represented by the first oxynitride, the second oxynitride, and the third oxynitride may be the same, or of course, may be different, and is used only to distinguish the oxynitride at different positions.
Similarly, the other terms "first", "second" and "third" in this document are used only for distinguishing the same kind of substances, and do not have any limitation.
Specifically, when the nitrogen oxide content is acquired, a real-time acquisition mode can be adopted, and an interval acquisition mode can also be adopted, however, in order to ensure that the content of the nitrogen oxide entering the SCR system can be well monitored, when the interval acquisition mode is adopted, the interval time between two acquisition modes cannot be too long.
Step S20: and determining an ammonia spraying pipeline to be adjusted in the coal-fired unit and a target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content.
Specifically, the ammonia injection pipeline to be adjusted in the coal-fired unit and the target ammonia gas flow rate of the ammonia injection pipeline to be adjusted can be determined through the following steps:
determining a first acceleration value corresponding to the first nitrogen oxide content, determining a second acceleration value corresponding to the second nitrogen oxide content, and determining a third acceleration value corresponding to the third nitrogen oxide content;
when the first acceleration value exceeds a preset acceleration value, taking a first ammonia spraying pipeline corresponding to the first flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a first correction value, determining a first ammonia gas flow of the first ammonia spraying pipeline based on the first correction value, and taking the first ammonia gas flow as the target ammonia gas flow;
when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a second correction value, determining a second ammonia flow rate of the second ammonia spraying pipeline based on the second correction value, and taking the second ammonia flow rate as the target ammonia flow rate;
and when the third acceleration value exceeds a preset acceleration value, taking the first ammonia spraying pipeline and the second ammonia spraying pipeline as ammonia spraying pipelines to be adjusted to generate a third correction value, determining a third ammonia flow of the first ammonia spraying pipeline and a fourth ammonia flow of the second ammonia spraying pipeline based on the third correction value, taking the third ammonia flow as a target ammonia flow of the first ammonia spraying pipeline, and taking the fourth ammonia flow as a target ammonia flow of the second ammonia spraying pipeline.
It should be noted that, in the specific implementation, the preset speed increasing values respectively compared with the first speed increasing value, the second speed increasing value and the third speed increasing value, which are preset, may be the same or different, and the preset speed increasing values set in the present solution are the same, but it is also allowed to set different preset speed increasing values in other solutions.
Specifically, when the first acceleration value exceeds a preset acceleration value, the first ammonia injection pipeline corresponding to the first flue gas inlet is used as an ammonia injection pipeline to be adjusted, a first correction value is generated by combining the reaction ratio of nitrogen oxides and ammonia gas in the catalytic reaction of an SCR system according to the specific first acceleration value, the current ammonia gas flow of the first ammonia injection pipeline is corrected based on the first correction value, the first ammonia gas flow of the first ammonia injection pipeline is determined, and the first ammonia gas flow is used as the target ammonia gas flow.
And when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted, generating a second correction value by combining the reaction ratio of nitrogen oxides and ammonia gas in the catalytic reaction of the SCR system according to the specific second acceleration value, modifying the current ammonia gas flow of the second ammonia spraying pipeline based on the second correction value, determining the second ammonia gas flow of the second ammonia spraying pipeline, and taking the second ammonia gas flow as the target ammonia gas flow.
Correspondingly, when a third acceleration value corresponding to the third nitrogen oxide content exceeds a preset increment value, the ammonia gas flow of the first ammonia injection pipeline and the ammonia gas flow of the second ammonia injection pipeline need to be adjusted simultaneously. Specifically, a third correction value is generated, a third ammonia gas flow is generated based on the current ammonia gas flow of the first ammonia spraying pipeline of the third correction value, the current ammonia gas flow of the second ammonia spraying pipeline is adjusted to generate a fourth ammonia gas flow, the third ammonia gas flow is used as the target ammonia gas flow of the first ammonia spraying pipeline, and the fourth ammonia gas flow is used as the target ammonia gas flow of the second ammonia spraying pipeline.
In this embodiment, the first nitrogen oxide content, the second nitrogen oxide content, and the third nitrogen oxide content are actually monitored, the nitrogen oxide content trend of each pipeline is grasped, and when the nitrogen oxide content increases, the ammonia flow of the corresponding ammonia injection pipeline is adjusted in advance in time, that is, the ammonia flow is subjected to fuzzy prediction, so as to implement a strategy of coping with the ammonia flow in time.
Further, after determining a target ammonia gas flow rate of an ammonia injection pipeline to be adjusted and an ammonia injection pipeline to be adjusted in the coal-fired unit and adjusting the ammonia gas flow rate of the ammonia injection pipeline to be adjusted based on the target ammonia gas flow rate, the effect after adjustment can be examined, specifically, the following steps can be followed:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet, the content of a fifth nitrogen oxide at a second flue gas outlet and the current content of a third nitrogen oxide in a coal-fired unit;
comparing the fourth nitrogen oxide content with a first preset content value, comparing the fifth oxide content with a second preset content value, and comparing the third nitrogen oxide content with a third preset content value;
when the content of the fourth nitrogen oxide exceeds a first preset content value, generating a fourth correction value, and adjusting the current ammonia gas flow of the first ammonia spraying pipeline based on the fourth correction value;
generating a fifth correction value when the content of the fifth nitrogen oxide exceeds a second preset content value, and adjusting the current ammonia gas flow of the second ammonia spraying pipeline based on the fifth correction value;
and generating a sixth correction value when the content of the current third nitrogen oxide exceeds a third preset content value, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the sixth correction value.
It is understood that when the fourth nitrogen oxide content exceeds the first preset content, it indicates that the ammonia gas flow rate of the first ammonia injection pipeline cannot meet the requirement, i.e. the nitrogen oxides in the pipeline cannot be completely reacted, and therefore, a fourth correction value may be generated, and the current ammonia gas flow rate of the first ammonia injection pipeline may be adjusted based on the fourth correction value.
When the content of the fifth nitrogen oxide exceeds a second preset content, the ammonia gas flow of the second ammonia injection pipeline does not meet the requirement, so that a fifth correction value can be generated, and the current ammonia gas flow of the second ammonia injection pipeline is adjusted based on the fifth correction value.
It should be noted that, the current third nitrogen oxide content here is the nitrogen oxide content of the environmental-friendly discharge port after adjustment, and when the current third nitrogen oxide content exceeds a third preset content value, the current ammonia gas flow rates of the first ammonia injection pipeline and the second ammonia injection pipeline need to be adjusted respectively.
Further, when the fourth nitrogen oxide content does not exceed the first preset content value, the fourth nitrogen oxide content does not exceed the second preset content value, and when the current third nitrogen oxide content does not exceed the third preset content value, the nitrogen oxide content of the first flue gas outlet and the nitrogen oxide content of the second flue gas outlet may be monitored to play a better prediction role, and specifically, the method may be performed through the following steps:
determining a fourth acceleration value corresponding to the fourth nitrogen oxide content and a fifth acceleration value corresponding to the fifth nitrogen oxide content;
generating a seventh correction value when the fourth acceleration value exceeds a preset acceleration value, and adjusting the current ammonia gas flow of the first ammonia gas pipeline based on the seventh correction value;
and when the fifth acceleration value exceeds a preset acceleration value, generating an eighth correction value, and adjusting the current ammonia gas flow of the second ammonia gas pipeline based on the eighth correction value.
In the embodiment, the nitrogen oxide content at the inlet and the outlet of the two pipelines in the SCR system is monitored simultaneously, so that a better prediction effect can be achieved.
In the embodiment, the content of the second nitrogen oxide at the second flue gas inlet in the coal-fired unit is obtained by obtaining the content of the first nitrogen oxide at the first flue gas inlet in the coal-fired unit, and obtaining the third nitrogen oxide content of the environment-friendly discharge port in the coal-fired unit, determining the ammonia spraying pipeline to be adjusted in the coal-fired unit and the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, and determining the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the nitrogen oxide content of the two flue gas inlets and the nitrogen oxide content of the environment-friendly discharge port, the content trend of the nitrogen oxides in the whole system is pre-judged, so that the ammonia spraying pipeline to be adjusted and the target ammonia flow of the ammonia spraying pipeline to be adjusted are determined, the control of the flow of the ammonia gas is advanced, and air pollution caused by the emission of a large amount of nitrogen oxides to the air is avoided.
Referring to fig. 3, fig. 3 is a schematic flow chart of a method for controlling ammonia gas flow according to a second embodiment of the present invention, and the second embodiment of the method for controlling ammonia gas flow according to the present invention is proposed based on the embodiment shown in fig. 2.
In the second embodiment, after the step S20, the method includes:
step S30: and acquiring the fourth nitrogen oxide content of the first flue gas outlet and the fifth nitrogen oxide content of the second flue gas outlet in the coal-fired unit.
Step S40: and when the difference value of the content of the fourth nitrogen oxide and the content of the fifth nitrogen oxide exceeds a preset threshold value, adjusting the current ammonia flow of the first ammonia spraying pipeline and the second ammonia spraying pipeline.
In the specific implementation, the content of a fourth nitrogen oxide in the first flue gas outlet and the content of a fifth nitrogen oxide in the second flue gas outlet can be obtained in real time or at intervals, when the difference value between the content of the fourth nitrogen oxide and the content of the fifth nitrogen oxide exceeds a preset threshold value, the situation that ammonia injection imbalance exists in the two ammonia injection pipelines can be considered, and the current ammonia flow rates of the first ammonia injection pipeline and the second ammonia injection pipeline can be adjusted.
It will be appreciated that the load of the boiler in the coal burning unit varies greatly and that the amount of nitrogen oxides entering the SCR system during start-up and shut-down of the coal mill varies greatly, and therefore, special treatment schemes need to be provided for specific situations.
Specifically, the load information of the coal-fired unit may be monitored, when the load information changes, a ninth correction value is generated based on a preset rule, and based on the ninth correction value, the current ammonia gas flow rates of the first ammonia injection pipeline and the second ammonia injection pipeline are adjusted.
Further, the working state information of a coal mill of the coal-fired unit is obtained, a tenth correction value is generated when the working state information of the coal mill meets a preset condition, and the current ammonia flow of the first ammonia injection pipeline and the current ammonia flow of the second ammonia injection pipeline are adjusted based on the tenth correction value.
And acquiring the working state of a coal mill of the coal-fired unit, generating a corresponding correction value when the working state of the coal mill changes, namely starting or stopping, and adjusting the current ammonia flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the correction value.
In this embodiment, the fourth nitrogen oxide content of first exhanst gas outlet and the fifth nitrogen oxide content of second exhanst gas outlet are monitored, when fourth nitrogen oxide content and the difference value of fifth nitrogen oxide content are too big, two ammonia injection pipelines reappear obvious ammonia injection when unbalanced, adjust the current ammonia flow of first ammonia injection pipeline and second ammonia injection pipeline, simultaneously, based on the condition that the nitrogen oxide content suddenly increases in introducing the SCR system that coal-fired unit probably appears, corresponding reply strategy has also been provided, thereby guarantee that the nitrogen oxide content in the flue gas that whole coal-fired unit discharged accords with environmental protection emission standard.
Furthermore, an embodiment of the present invention further provides a storage medium, where a control program of an ammonia gas flow rate is stored on the storage medium, and when executed by a processor, the control program of the ammonia gas flow rate implements the following operations:
acquiring the content of a first nitrogen oxide at a first flue gas inlet in a coal-fired unit, acquiring the content of a second nitrogen oxide at a second flue gas inlet in the coal-fired unit, and acquiring the content of a third nitrogen oxide at an environment-friendly discharge port in the coal-fired unit;
and determining an ammonia spraying pipeline to be adjusted in the coal-fired unit and a target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content.
Further, the control program of the ammonia gas flow is executed by the processor to realize the following operations:
determining a first acceleration value corresponding to the first nitrogen oxide content, determining a second acceleration value corresponding to the second nitrogen oxide content, and determining a third acceleration value corresponding to the third nitrogen oxide content;
when the first acceleration value exceeds a preset acceleration value, taking a first ammonia spraying pipeline corresponding to the first flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a first correction value, determining a first ammonia gas flow of the first ammonia spraying pipeline based on the first correction value, and taking the first ammonia gas flow as the target ammonia gas flow;
when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a second correction value, determining a second ammonia flow rate of the second ammonia spraying pipeline based on the second correction value, and taking the second ammonia flow rate as the target ammonia flow rate;
and when the third acceleration value exceeds a preset acceleration value, taking the first ammonia spraying pipeline and the second ammonia spraying pipeline as ammonia spraying pipelines to be adjusted to generate a third correction value, determining a third ammonia flow of the first ammonia spraying pipeline and a fourth ammonia flow of the second ammonia spraying pipeline based on the third correction value, taking the third ammonia flow as a target ammonia flow of the first ammonia spraying pipeline, and taking the fourth ammonia flow as a target ammonia flow of the second ammonia spraying pipeline.
Further, the control program of the ammonia gas flow is executed by the processor to realize the following operations:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet, the content of a fifth nitrogen oxide at a second flue gas outlet and the current content of a third nitrogen oxide in a coal-fired unit;
comparing the fourth nitrogen oxide content with a first preset content value, comparing the fifth oxide content with a second preset content value, and comparing the current third nitrogen oxide content with a third preset content value;
when the content of the fourth nitrogen oxide exceeds a first preset content value, generating a fourth correction value, and adjusting the current ammonia gas flow of the first ammonia spraying pipeline based on the fourth correction value;
generating a fifth correction value when the content of the fifth nitrogen oxide exceeds a second preset content value, and adjusting the current ammonia gas flow of the second ammonia spraying pipeline based on the fifth correction value;
and generating a sixth correction value when the content of the current third nitrogen oxide exceeds a third preset content value, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the sixth correction value.
Further, the control program of the ammonia gas flow is executed by the processor to realize the following operations:
when the fourth nitrogen oxide content does not exceed the first preset content value, the fourth nitrogen oxide content does not exceed a second preset content value, and the current third nitrogen oxide content does not exceed a third preset content value;
determining a fourth acceleration value corresponding to the fourth nitrogen oxide content and a fifth acceleration value corresponding to the fifth nitrogen oxide content;
generating a seventh correction value when the fourth acceleration value exceeds a preset acceleration value, and adjusting the current ammonia gas flow of the first ammonia gas pipeline based on the seventh correction value;
and when the fifth acceleration value exceeds a preset acceleration value, generating an eighth correction value, and adjusting the current ammonia gas flow of the second ammonia gas pipeline based on the eighth correction value.
Further, the control program of the ammonia gas flow is executed by the processor to realize the following operations:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet and the content of a fifth nitrogen oxide at a second flue gas outlet in the coal-fired unit;
and when the difference value of the fourth nitrogen oxide content and the fifth nitrogen oxide content exceeds a preset threshold value, adjusting the current ammonia gas flow of the first spray pipe pipeline and the second spray pipe pipeline.
Further, the control program of the ammonia gas flow is executed by the processor to realize the following operations:
monitoring the load information of the coal-fired unit;
and when the load information changes, generating a ninth correction value based on a preset rule, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the ninth correction value.
Further, the control program of the ammonia gas flow is executed by the processor to realize the following operations:
acquiring the working state information of a coal mill of the coal-fired unit;
and generating a tenth correction value when the working state information of the coal mill meets a preset condition, and adjusting the current ammonia flow of the first ammonia injection pipeline and the current ammonia flow of the second ammonia injection pipeline based on the tenth correction value.
In the embodiment, the first nitrogen oxide content of the first flue gas inlet in the coal-fired unit is obtained, the second nitrogen oxide content of the second flue gas inlet in the coal-fired unit is obtained, and obtaining the third nitrogen oxide content of the environment-friendly discharge port in the coal-fired unit, determining the ammonia spraying pipeline to be adjusted in the coal-fired unit and the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, and determining the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the nitrogen oxide content of the two flue gas inlets and the nitrogen oxide content of the environment-friendly discharge port, the content trend of the nitrogen oxides in the whole system is pre-judged, so that the ammonia spraying pipeline to be adjusted and the target ammonia flow of the ammonia spraying pipeline to be adjusted are determined, the control of the flow of the ammonia gas is advanced, and air pollution caused by the emission of a large amount of nitrogen oxides to the air is avoided.
Referring to fig. 4, fig. 4 is a functional block diagram of a first embodiment of the ammonia gas flow rate control apparatus according to the present invention, and the first embodiment of the ammonia gas flow rate control apparatus according to the present invention is proposed based on the ammonia gas flow rate control method.
In this embodiment, the ammonia gas flow rate control device includes:
the obtaining module 10 is configured to obtain a first nitrogen oxide content at a first flue gas inlet in the coal-fired unit, obtain a second nitrogen oxide content at a second flue gas inlet in the coal-fired unit, and obtain a third nitrogen oxide content at an environment-friendly discharge port in the coal-fired unit.
It is to be understood that "first" in "first oxynitride," and "second" in "second oxynitride," and "third" in "third oxynitride" in this embodiment do not constitute any limitation on the oxynitride, and the composition of the oxynitride represented by the first oxynitride, the second oxynitride, and the third oxynitride may be the same, or of course, may be different, and is used only to distinguish the oxynitride at different positions.
Similarly, the other terms "first", "second" and "third" in this document are used only for distinguishing the same kind of substances, and do not have any limitation.
Specifically, when the nitrogen oxide content is acquired, a real-time acquisition mode can be adopted, and an interval acquisition mode can also be adopted, however, in order to ensure that the content of the nitrogen oxide entering the SCR system can be well monitored, when the interval acquisition mode is adopted, the interval time between two acquisition modes cannot be too long.
And the adjusting module 20 is configured to determine an ammonia injection pipeline to be adjusted in the coal-fired unit and a target ammonia gas flow rate of the ammonia injection pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content.
Specifically, the ammonia injection pipeline to be adjusted in the coal-fired unit and the target ammonia gas flow rate of the ammonia injection pipeline to be adjusted can be determined through the following steps:
determining a first acceleration value corresponding to the first nitrogen oxide content, determining a second acceleration value corresponding to the second nitrogen oxide content, and determining a third acceleration value corresponding to the third nitrogen oxide content;
when the first acceleration value exceeds a preset acceleration value, taking a first ammonia spraying pipeline corresponding to the first flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a first correction value, determining a first ammonia gas flow of the first ammonia spraying pipeline based on the first correction value, and taking the first ammonia gas flow as the target ammonia gas flow;
when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a second correction value, determining a second ammonia flow rate of the second ammonia spraying pipeline based on the second correction value, and taking the second ammonia flow rate as the target ammonia flow rate;
and when the third acceleration value exceeds a preset acceleration value, taking the first ammonia spraying pipeline and the second ammonia spraying pipeline as ammonia spraying pipelines to be adjusted to generate a third correction value, determining a third ammonia flow of the first ammonia spraying pipeline and a fourth ammonia flow of the second ammonia spraying pipeline based on the third correction value, taking the third ammonia flow as a target ammonia flow of the first ammonia spraying pipeline, and taking the fourth ammonia flow as a target ammonia flow of the second ammonia spraying pipeline.
It should be noted that, in the specific implementation, the preset speed increasing values respectively compared with the first speed increasing value, the second speed increasing value and the third speed increasing value, which are preset, may be the same or different, and the preset speed increasing values set in the present solution are the same, but it is also allowed to set different preset speed increasing values in other solutions.
Specifically, when the first acceleration value exceeds a preset acceleration value, the first ammonia injection pipeline corresponding to the first flue gas inlet is used as an ammonia injection pipeline to be adjusted, a first correction value is generated by combining the reaction ratio of nitrogen oxides and ammonia gas in the catalytic reaction of an SCR system according to the specific first acceleration value, the current ammonia gas flow of the first ammonia injection pipeline is corrected based on the first correction value, the first ammonia gas flow of the first ammonia injection pipeline is determined, and the first ammonia gas flow is used as the target ammonia gas flow.
And when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted, generating a second correction value by combining the reaction ratio of nitrogen oxides and ammonia gas in the catalytic reaction of the SCR system according to the specific second acceleration value, modifying the current ammonia gas flow of the second ammonia spraying pipeline based on the second correction value, determining the second ammonia gas flow of the second ammonia spraying pipeline, and taking the second ammonia gas flow as the target ammonia gas flow.
Correspondingly, when a third acceleration value corresponding to the third nitrogen oxide content exceeds a preset increment value, the ammonia gas flow of the first ammonia injection pipeline and the ammonia gas flow of the second ammonia injection pipeline need to be adjusted simultaneously. Specifically, a third correction value is generated, a third ammonia gas flow is generated based on the current ammonia gas flow of the first ammonia spraying pipeline of the third correction value, the current ammonia gas flow of the second ammonia spraying pipeline is adjusted to generate a fourth ammonia gas flow, the third ammonia gas flow is used as the target ammonia gas flow of the first ammonia spraying pipeline, and the fourth ammonia gas flow is used as the target ammonia gas flow of the second ammonia spraying pipeline.
In this embodiment, the first nitrogen oxide content, the second nitrogen oxide content, and the third nitrogen oxide content are actually monitored, the nitrogen oxide content trend of each pipeline is grasped, and when the nitrogen oxide content increases, the ammonia flow of the corresponding ammonia injection pipeline is adjusted in advance in time, that is, the ammonia flow is subjected to fuzzy prediction, so as to implement a strategy of coping with the ammonia flow in time.
Further, after determining a target ammonia gas flow rate of an ammonia injection pipeline to be adjusted and an ammonia injection pipeline to be adjusted in the coal-fired unit and adjusting the ammonia gas flow rate of the ammonia injection pipeline to be adjusted based on the target ammonia gas flow rate, the effect after adjustment can be examined, specifically, the following steps can be followed:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet, the content of a fifth nitrogen oxide at a second flue gas outlet and the current content of a third nitrogen oxide in a coal-fired unit;
comparing the fourth nitrogen oxide content with a first preset content value, comparing the fifth oxide content with a second preset content value, and comparing the third nitrogen oxide content with a third preset content value;
when the content of the fourth nitrogen oxide exceeds a first preset content value, generating a fourth correction value, and adjusting the current ammonia gas flow of the first ammonia spraying pipeline based on the fourth correction value;
generating a fifth correction value when the content of the fifth nitrogen oxide exceeds a second preset content value, and adjusting the current ammonia gas flow of the second ammonia spraying pipeline based on the fifth correction value;
and generating a sixth correction value when the content of the current third nitrogen oxide exceeds a third preset content value, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the sixth correction value.
It is understood that when the fourth nitrogen oxide content exceeds the first preset content, it indicates that the ammonia gas flow rate of the first ammonia injection pipeline cannot meet the requirement, i.e. the nitrogen oxides in the pipeline cannot be completely reacted, and therefore, a fourth correction value may be generated, and the current ammonia gas flow rate of the first ammonia injection pipeline may be adjusted based on the fourth correction value.
When the content of the fifth nitrogen oxide exceeds a second preset content, the ammonia gas flow of the second ammonia injection pipeline does not meet the requirement, so that a fifth correction value can be generated, and the current ammonia gas flow of the second ammonia injection pipeline is adjusted based on the fifth correction value.
It should be noted that, the current third nitrogen oxide content here is the nitrogen oxide content of the environmental-friendly discharge port after adjustment, and when the current third nitrogen oxide content exceeds a third preset content value, the current ammonia gas flow rates of the first ammonia injection pipeline and the second ammonia injection pipeline need to be adjusted respectively.
Further, when the fourth nitrogen oxide content does not exceed the first preset content value, the fourth nitrogen oxide content does not exceed the second preset content value, and when the current third nitrogen oxide content does not exceed the third preset content value, the nitrogen oxide content of the first flue gas outlet and the nitrogen oxide content of the second flue gas outlet may be monitored to play a better prediction role, and specifically, the method may be performed through the following steps:
determining a fourth acceleration value corresponding to the fourth nitrogen oxide content and a fifth acceleration value corresponding to the fifth nitrogen oxide content;
generating a seventh correction value when the fourth acceleration value exceeds a preset acceleration value, and adjusting the current ammonia gas flow of the first ammonia gas pipeline based on the seventh correction value;
and when the fifth acceleration value exceeds a preset acceleration value, generating an eighth correction value, and adjusting the current ammonia gas flow of the second ammonia gas pipeline based on the eighth correction value.
In the embodiment, the nitrogen oxide content at the inlet and the outlet of the two pipelines in the SCR system is monitored simultaneously, so that a better prediction effect can be achieved.
In the embodiment, the content of the second nitrogen oxide at the second flue gas inlet in the coal-fired unit is obtained by obtaining the content of the first nitrogen oxide at the first flue gas inlet in the coal-fired unit, and obtaining the third nitrogen oxide content of the environment-friendly discharge port in the coal-fired unit, determining the ammonia spraying pipeline to be adjusted in the coal-fired unit and the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content, and determining the target ammonia flow of the ammonia spraying pipeline to be adjusted based on the nitrogen oxide content of the two flue gas inlets and the nitrogen oxide content of the environment-friendly discharge port, the content trend of the nitrogen oxides in the whole system is pre-judged, so that the ammonia spraying pipeline to be adjusted and the target ammonia flow of the ammonia spraying pipeline to be adjusted are determined, the control of the flow of the ammonia gas is advanced, and air pollution caused by the emission of a large amount of nitrogen oxides to the air is avoided.
It can be understood that the modules in the ammonia gas flow control device are also used for realizing the steps in the method, and the details are not repeated.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The use of the words first, second, third, etc. do not denote any order, but rather the words are to be construed as names.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal smart tv (which may be a mobile phone, a computer, a server, an air conditioner, or a network smart tv, etc.) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. A method for controlling the flow of ammonia gas, the method comprising:
acquiring the content of a first nitrogen oxide at a first flue gas inlet in a coal-fired unit, acquiring the content of a second nitrogen oxide at a second flue gas inlet in the coal-fired unit, and acquiring the content of a third nitrogen oxide at an environment-friendly discharge port in the coal-fired unit;
determining an ammonia injection pipeline to be adjusted in the coal-fired unit and a target ammonia flow of the ammonia injection pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content;
the determining of the ammonia injection pipeline to be adjusted in the coal-fired unit and the target ammonia flow of the ammonia injection pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content specifically comprises:
determining a first acceleration value corresponding to the first nitrogen oxide content, determining a second acceleration value corresponding to the second nitrogen oxide content, and determining a third acceleration value corresponding to the third nitrogen oxide content;
when the first acceleration value exceeds a preset acceleration value, taking a first ammonia spraying pipeline corresponding to the first flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a first correction value, determining a first ammonia gas flow of the first ammonia spraying pipeline based on the first correction value, and taking the first ammonia gas flow as the target ammonia gas flow;
when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a second correction value, determining a second ammonia flow rate of the second ammonia spraying pipeline based on the second correction value, and taking the second ammonia flow rate as the target ammonia flow rate;
and when the third acceleration value exceeds a preset acceleration value, taking the first ammonia spraying pipeline and the second ammonia spraying pipeline as ammonia spraying pipelines to be adjusted to generate a third correction value, determining a third ammonia flow of the first ammonia spraying pipeline and a fourth ammonia flow of the second ammonia spraying pipeline based on the third correction value, taking the third ammonia flow as a target ammonia flow of the first ammonia spraying pipeline, and taking the fourth ammonia flow as a target ammonia flow of the second ammonia spraying pipeline.
2. The method of claim 1, wherein after determining the ammonia injection line to be adjusted in the coal burning unit and the target ammonia gas flow rate for the ammonia injection line to be adjusted based on the first, second, and third nitrogen oxide contents, the method further comprises:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet, the content of a fifth nitrogen oxide at a second flue gas outlet and the current content of a third nitrogen oxide in a coal-fired unit;
comparing the fourth nitrogen oxide content with a first preset content value, comparing the fifth nitrogen oxide content with a second preset content value, and comparing the current third nitrogen oxide content with a third preset content value;
when the content of the fourth nitrogen oxide exceeds a first preset content value, generating a fourth correction value, and adjusting the current ammonia gas flow of the first ammonia spraying pipeline based on the fourth correction value;
generating a fifth correction value when the content of the fifth nitrogen oxide exceeds a second preset content value, and adjusting the current ammonia gas flow of the second ammonia spraying pipeline based on the fifth correction value;
and generating a sixth correction value when the content of the current third nitrogen oxide exceeds a third preset content value, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the sixth correction value.
3. The method of claim 2, wherein after comparing the fourth nitrogen oxide content to a first predetermined content value, comparing the fifth nitrogen oxide content to a second predetermined content value, and comparing the current third nitrogen oxide content to a third predetermined content value, the method further comprises:
when the fourth nitrogen oxide content does not exceed the first preset content value, the fifth nitrogen oxide content does not exceed a second preset content value, and the current third nitrogen oxide content does not exceed a third preset content value;
determining a fourth acceleration value corresponding to the fourth nitrogen oxide content and a fifth acceleration value corresponding to the fifth nitrogen oxide content;
when the fourth acceleration value exceeds a preset acceleration value, generating a seventh correction value, and adjusting the current ammonia gas flow of the first ammonia spraying pipeline based on the seventh correction value;
and when the fifth acceleration value exceeds a preset acceleration value, generating an eighth correction value, and adjusting the current ammonia gas flow of the second ammonia spraying pipeline based on the eighth correction value.
4. The method of claim 1, wherein after determining the ammonia injection line to be adjusted in the coal burning unit and the target ammonia gas flow rate for the ammonia injection line to be adjusted based on the first, second, and third nitrogen oxide contents, the method further comprises:
acquiring the content of a fourth nitrogen oxide at a first flue gas outlet and the content of a fifth nitrogen oxide at a second flue gas outlet in the coal-fired unit;
and when the difference value of the content of the fourth nitrogen oxide and the content of the fifth nitrogen oxide exceeds a preset threshold value, adjusting the current ammonia flow of the first ammonia spraying pipeline and the second ammonia spraying pipeline.
5. The method of claim 1, wherein after determining the ammonia injection line to be adjusted in the coal burning unit and the target ammonia gas flow rate for the ammonia injection line to be adjusted based on the first, second, and third nitrogen oxide contents, the method further comprises:
monitoring the load information of the coal-fired unit;
and when the load information changes, generating a ninth correction value based on a preset rule, and adjusting the current ammonia gas flow of the first ammonia injection pipeline and the second ammonia injection pipeline based on the ninth correction value.
6. The method of claim 1, wherein after determining the ammonia injection line to be adjusted in the coal burning unit and the target ammonia gas flow rate for the ammonia injection line to be adjusted based on the first, second, and third nitrogen oxide contents, the method further comprises:
acquiring the working state information of a coal mill of the coal-fired unit;
and generating a tenth correction value when the working state information of the coal mill meets a preset condition, and adjusting the current ammonia flow of the first ammonia injection pipeline and the current ammonia flow of the second ammonia injection pipeline based on the tenth correction value.
7. An apparatus for controlling the flow of ammonia gas, the apparatus comprising: a memory, a processor and a control program of ammonia gas flow stored on the memory and operable on the processor, the control program of ammonia gas flow being executed by the processor to implement the steps of the method of ammonia gas flow control according to any one of claims 1 to 6.
8. A storage medium having stored thereon a control program of an ammonia gas flow rate, the control program of the ammonia gas flow rate being executed by a processor to implement the steps of the method of controlling an ammonia gas flow rate according to any one of claims 1 to 6.
9. An ammonia gas flow rate control device, characterized by comprising:
the acquisition module is used for acquiring the content of a first nitrogen oxide at a first flue gas inlet in the coal-fired unit, acquiring the content of a second nitrogen oxide at a second flue gas inlet in the coal-fired unit and acquiring the content of a third nitrogen oxide at an environment-friendly discharge port in the coal-fired unit;
the adjusting module is used for determining an ammonia spraying pipeline to be adjusted in the coal-fired unit and a target ammonia flow of the ammonia spraying pipeline to be adjusted based on the first nitrogen oxide content, the second nitrogen oxide content and the third nitrogen oxide content;
the adjusting module is further used for determining a first acceleration value corresponding to the first nitrogen oxide content, determining a second acceleration value corresponding to the second nitrogen oxide content, and determining a third acceleration value corresponding to the third nitrogen oxide content; when the first acceleration value exceeds a preset acceleration value, taking a first ammonia spraying pipeline corresponding to the first flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a first correction value, determining a first ammonia gas flow of the first ammonia spraying pipeline based on the first correction value, and taking the first ammonia gas flow as the target ammonia gas flow; when the second acceleration value exceeds a preset acceleration value, taking a second ammonia spraying pipeline corresponding to the second flue gas inlet as an ammonia spraying pipeline to be adjusted to generate a second correction value, determining a second ammonia flow rate of the second ammonia spraying pipeline based on the second correction value, and taking the second ammonia flow rate as the target ammonia flow rate; and when the third acceleration value exceeds a preset acceleration value, taking the first ammonia spraying pipeline and the second ammonia spraying pipeline as ammonia spraying pipelines to be adjusted to generate a third correction value, determining a third ammonia flow of the first ammonia spraying pipeline and a fourth ammonia flow of the second ammonia spraying pipeline based on the third correction value, taking the third ammonia flow as a target ammonia flow of the first ammonia spraying pipeline, and taking the fourth ammonia flow as a target ammonia flow of the second ammonia spraying pipeline.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106994303A (en) * 2017-05-27 2017-08-01 南京化学工业园热电有限公司 Denitration SCR sprays ammonia control system and control method

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