CN111068502A - Ammonia escape control system and control method - Google Patents
Ammonia escape control system and control method Download PDFInfo
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- CN111068502A CN111068502A CN202010113911.0A CN202010113911A CN111068502A CN 111068502 A CN111068502 A CN 111068502A CN 202010113911 A CN202010113911 A CN 202010113911A CN 111068502 A CN111068502 A CN 111068502A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/58—Ammonia
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Abstract
The invention discloses an ammonia escape control system and a control method, wherein the ammonia escape control system comprises an absorption tower, a flue system, an absorbent conveying system, an absorbent absorption system, a byproduct treatment system and a water conveying system which are respectively connected with the absorption tower, a control terminal is respectively connected with the flue system, the absorbent conveying system, the absorbent absorption system, the byproduct treatment system and the water conveying system in a control mode, the concentration of ammonia in the absorption tower can be reduced by adopting the flue system, the absorbent conveying system, the absorbent absorption system, the byproduct treatment system and the water conveying system which are independently arranged to be matched and connected with the absorption tower, the ultra-low emission of nitrogen oxides in a cement plant is guaranteed, meanwhile, the ammonia escape emission is controlled to be below the national standard, the structure is simple, and the use is convenient.
Description
Technical Field
The invention relates to the field of environment-friendly devices, in particular to an ammonia escape control system and an ammonia escape control method.
Background
Ammonia gas, a gas with a strong pungent smell, has irritation to the nose, throat and lungs after being inhaled, and causes cough, shortness of breath, asthma and the like; edema of larynx and lung, and damage to heart, liver and kidney in severe cases; burn can be caused when the eye is splashed into eyes, and burn can be caused when skin is contacted; oral burn of the digestive tract; chronic effects: repeated low concentration contact can cause bronchitis and dermatitis.
As is well known, the important reducing agent for denitration reaction of the cement plant is ammonia water, and the ammonia gas can selectively reduce NOx in the flue gas at the temperature of 850-1100 ℃ in a decomposing furnace without the action of a catalyst and basically does not react with O in the flue gas2Thus, the SNCR method has been developed; in the range of 850-1100 ℃, the main reaction is as follows: 4NH3+4NO+O2→4N2+6H2O。
The optimum reaction temperature zone of the ammonia gas is 850-110O ℃, when the reaction temperature is too high, the NOx reduction rate is reduced due to the decomposition of the ammonia, and on the other hand, when the reaction temperature is too low, the escape of the ammonia is increased, and the NOx reduction rate is also reduced; ammonia gas is a highly volatile and toxic substance, and escape of ammonia causes new environmental pollution.
Two reasons for causing the ammonia escape of the SNCR system exist, firstly, the reaction of ammonia and NOx is influenced due to the low temperature of the flue gas at the injection point; another possibility is that the injected reductant is excessive or the reductant is unevenly distributed, and the reductant injection system must be capable of injecting the reductant into the most effective part of the furnace, because the distribution of NOx in the furnace is often changed, if too few control points are injected or the distribution of ammonia injected on a certain cross section in the furnace is uneven, a higher ammonia escape amount is generated; in larger cross-section furnaces or smokers, uniform distribution of the reducing agent is more difficult because longer injection distances require coverage of a considerable cross-section of the furnace; in order to ensure that the denitration reaction can be fully carried out and achieve the best reduction effect by the least amount of injected ammonia, the injected ammonia and the flue gas must be well mixed; if the injected ammonia gas is not fully reacted, the escaped ammonia gas can not only make the fly ash in the flue gas easily deposited on the inner surface of the equipment, but also make NH in the flue gas3Encounter S03Will generate (NH)4)2S04Has corrosion to downstream equipmentThe risk of corrosion.
The Chinese invention patent 201310233883.6 relates to an absorption tower for combined removal of sulfur dioxide and nitrogen oxide in flue gas, the invention patent 201210581015.2 relates to a flue gas ammonia desulfurization and deslagging system, the invention patent 201210143824.5 relates to an advanced oxidation catalysis desulfurization and denitrification integrated process and device, and the utility model patent 200910198724.6 relates to a packless empty tower spray type ammonia flue gas desulfurization device, which all provide desulfurization devices, but the devices are complicated and inconvenient to use.
Disclosure of Invention
The invention aims to solve the technical problems that ammonia escapes when ammonia water is used in a cement plant, and the ammonia escapes to cause environmental pollution, and provides an ammonia escape control system which can be matched with the company on the basis of a patent with application number 201910489417.1 applied on 6.6.2019 to further control the ammonia escape of the cement plant on the basis of ultralow emission.
The invention also provides an ammonia escape control method.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, an ammonia escape control system comprises an absorption tower, and a flue system, an absorbent delivery system, an absorbent absorption system, a byproduct treatment system and a water delivery system which are respectively connected to the absorption tower, wherein a control terminal is respectively connected with the flue system, the absorbent delivery system, the absorbent absorption system, the byproduct treatment system and the water delivery system in a control manner.
The above ammonia escape control system, wherein the flue system includes a tail exhaust fan, a tail exhaust chimney, and a tail exhaust chimney damper, the tail exhaust chimney damper is installed inside the tail exhaust chimney to divide the inside of the tail exhaust chimney into a first chamber and a second chamber, one end of the tail exhaust chimney near the first chamber is provided with an exhaust port and connected with an outlet flue pipe communicated with the outlet of the absorption tower, one end of the tail exhaust chimney near the second chamber is connected with a fan pipe communicated with the tail exhaust fan and an inlet flue pipe communicated with the tower body of the absorption tower;
an outlet flue damper is arranged in the outlet flue pipe, and an inlet flue damper is arranged in the inlet flue pipe;
the control terminal is respectively connected with the tail smoke chimney baffle door, the outlet flue baffle door and the inlet flue baffle door in a control mode to be opened or closed, so that the circulation of smoke and the adjustment of the smoke trend are facilitated;
the outlet flue pipe and the inlet flue pipe adopt a steel flue, are connected with the absorption tower and the tail smoke chimney in an airtight welding mode or a flange connection mode, provide low-level drainage measures for the outlet flue pipe and the inlet flue pipe and carry out anti-corrosion treatment, and are internally provided with supporting and reinforcing members for reinforcing, so that the stability and durability of the flue are ensured;
in the existing cement plant process system, flue gas is directly discharged into the atmosphere through a chimney, the flue gas in the technical scheme firstly enters the absorption tower through the inlet flue pipe on the tail discharge chimney for reaction, and the reacted clean flue gas returns to the tail discharge chimney through the outlet flue pipe for standard discharge.
The ammonia escape control system comprises an absorbent liquid tank, an absorbent delivery pump and an absorbent delivery pipeline, wherein the absorbent delivery pump is connected to the absorbent delivery pipeline, and two ends of the absorbent delivery pipeline are respectively communicated with the absorption tower and the absorbent liquid tank;
the absorbent liquid box is provided with a connecting interface which is externally connected with a liquid inlet device, the absorbent is arranged in the liquid inlet device, and the liquid inlet device conducts the introduction of the absorbent with the absorbent liquid box through the connecting interface;
the absorbent liquid tank is provided with a liquid tank remote transmission liquid level meter, the liquid tank remote transmission liquid level meter is connected with the control terminal to realize data interaction, and the liquid tank remote transmission liquid level meter detects liquid level data of an absorbent in the absorbent liquid tank in real time and sends the liquid level data to the control terminal for monitoring so as to supplement the absorbent;
the control terminal is connected with the absorbent delivery pump in a control mode, fresh absorbent is introduced into the absorption tower, and the concentration of ammonia gas is reduced through the reaction of the absorbent and the flue gas in the absorption tower;
the absorbent is mainly provided according to the numerical value of ammonia escape in on-line monitoring, and when the numerical value of ammonia escape in on-line monitoring rises, fresh absorbent can be judged and supplemented in time to ensure that the numerical value of ammonia escape reaches the standard.
In the ammonia escape control system, two absorbent conveying pipelines are arranged in parallel, and each absorbent conveying pipeline is connected with the absorbent conveying pump.
The ammonia escape control system comprises an absorbent circulating pump, a circulating conveying pipeline and a spraying assembly, wherein the spraying assembly comprises a spraying pipeline arranged inside the absorption tower and a nozzle arranged on the spraying pipeline, the absorbent circulating pump is connected to the circulating conveying pipeline, two ends of the circulating conveying pipeline are respectively communicated with the absorption tower and the spraying pipeline, the nozzle is arranged on the upper side of the joint of the circulating conveying pipeline and the absorption tower, and the nozzle is used for spraying an absorbent out so as to be convenient for reacting with ammonia gas in flue gas;
the absorbent is kept at the bottom of the absorption tower after entering the absorption tower, the absorbent circulating pump extracts the absorbent and guides the absorbent to the nozzle for spraying, the absorbent continuously contacts with the flue gas in a reverse direction for reaction when falling due to gravity, so that the reaction efficiency with the ammonia gas is improved, the full reaction is facilitated, and the escaped ammonia is removed;
the control terminal is connected with the absorbent circulating pump in a control mode.
In the ammonia escape control system, the plurality of spray pipelines are arranged at positions above the middle part of the absorption tower, and each spray pipeline is provided with a plurality of nozzles;
and one end of the spraying pipeline extending out of the absorption tower is communicated with the circulating conveying pipeline.
Foretell an ammonia escape control system, wherein, water conveying system contains water tank, water pump, water pipe, defroster, the defroster install in the inside of absorption tower and set up in the upside of nozzle, install the shower nozzle on the defroster, the water pump is connected on the water pipe, the both ends of water pipe respectively with the defroster the water tank intercommunication, water passes through the shower nozzle is spouted into the absorption tower guarantees that flue gas liquid droplet content is not more than 75mg/Nm3(dry basis);
the water tank is provided with a connecting pipe, the connecting pipe is provided with a water replenishing valve, and the other end of the connecting pipe is externally connected with a water inlet device;
the water tank is provided with a water level remote transmission liquid level meter, the water level remote transmission liquid level meter is connected with the control terminal to realize data interaction, and the water level remote transmission liquid level meter detects liquid level data of water in the water tank in real time and sends the liquid level data to the control terminal for monitoring so as to supplement the water;
the control terminal is respectively connected with the water pump, the demister and the water replenishing valve in a control mode;
the water conveying system mainly ensures that the moisture content of the flue gas reaches the standard and other impurity gases are removed after ammonia is removed, and can ensure that the content of liquid drops in the flue gas is not more than 75mg/Nm after water is sprayed into the flue gas by the water pump3(dry basis) and emission monitoring smoke values reach the standard.
In the ammonia escape control system, two water pipes are arranged in parallel, and each water pipe is connected with the water pump;
the defroster is provided with a plurality ofly, every all be equipped with a plurality of shower nozzles on the defroster.
The ammonia escape control system comprises a discharge pump and a discharge pipe, wherein the discharge pump is connected to the discharge pipe, one end of the discharge pipe is connected to the bottom of the absorption tower, the other end of the discharge pipe is externally connected with a byproduct treatment device, the byproduct treatment device is mainly a plant area treatment process system and comprises whole plant water source collection and disposal, and the specific process is mature and reliable for a cement plant;
the byproduct treatment system is mainly operated by monitoring an ammonia escape value on line through observing a plant area, when the ammonia escape value rises, the discharge pump can be started regularly to discharge liquid in the absorption tower, the absorbent absorption system is operated, and a fresh absorbent is supplemented to ensure the stable operation of the ammonia removal system so as to ensure the standard reaching of the ammonia escape monitored on line.
In a second aspect, a method for controlling ammonia slip, comprises the steps of:
step 1: introducing flue gas into the absorption tower, storing the flue gas in a second chamber, controlling a tail discharge chimney baffle door and an outlet flue baffle door to be closed by a control terminal, controlling the inlet flue baffle door to be opened, and introducing the flue gas into the absorption tower for reaction;
step 2: the method comprises the following steps that an absorbent is introduced into an absorption tower, the absorbent is stored in an absorbent liquid box, a control terminal controls an absorbent conveying pump to be started to introduce the absorbent into the absorption tower from the absorbent liquid box, and the absorbent reacts with part of smoke in the absorption tower;
and step 3: spraying an absorbent, wherein the control terminal controls an absorbent circulating pump to be started to introduce the absorbent at the bottom of the absorption tower into a nozzle for spraying, and the sprayed absorbent fully reacts with the flue gas in the absorption tower;
water is introduced into the absorption tower and stored in the water tank, the control terminal controls the water pump to be started to introduce the water from the water tank into the spray head for spraying, and the sprayed water is fully mixed with the flue gas in the absorption tower;
and 4, step 4: when the reaction is finished, the flue gas is reacted into clean flue gas, the control terminal controls the opening of the outlet flue damper, the clean flue gas flow is discharged through the exhaust port after being introduced into the first chamber, and at the moment, the tail exhaust flue damper is in a closed state.
In the above method for controlling ammonia slip, a byproduct is generated in the absorption tower after the reaction in step 4, and the byproduct is treated by the following steps: and the control terminal controls the discharge pump to be started, and the discharge pump discharges the by-product in the absorption tower to the by-product treatment device through the discharge pipe. According to the technical scheme provided by the ammonia escape control system and the ammonia escape control method, the technical effects are as follows: the absorption tower is connected with the flue system, the absorbent conveying system, the absorbent absorption system, the byproduct treatment system and the water conveying system which are independently arranged in a matching way, so that the concentration of ammonia in the absorption tower is reduced, the ultralow emission of nitrogen oxides in a cement plant is ensured on the basis of the lowest cost, and the ammonia escape emission is controlled to be below the national standard, the structure is simple, and the use is convenient;
the application and invention patent 201310233883.6 are an absorption tower for combined removal of sulfur dioxide and nitrogen oxides in flue gas, invention patent 201210581015.2 flue gas ammonia desulfurization and deslagging system, invention patent 201210143824.5 advanced oxidation catalysis desulfurization and denitrification integrated process and device, and utility model patent 200910198724.6 a packless empty tower spray type ammonia flue gas desulfurization device mainly has the following differences:
1. the absorption tower is of an empty tower structure, and is different from the structure of a filler tower in an absorption tower for combined removal of sulfur dioxide and nitrogen oxide in flue gas in patent 201310233883.6;
2. the absorbent in the application is a liquid absorbent, does not contain nitrogen and does not contain ammonia, is different from a flue gas ammonia desulphurization deslagging system disclosed in patent 201210581015.2, is ammonia water, and is mainly used for removing ammonia escape in an ammonia escape patent, so that ammonia cannot be generated; also different from the 201210143824.5 advanced oxidation catalytic desulfurization and denitrification integrated process and device, ozone is adopted as an oxidant;
3. the absorbent in this application is liquid absorbent, consequently does not establish the agitator in the absorption tower, need not blow into the oxidation air, this point is different from 201210143824.5 advanced oxidation catalysis SOx/NOx control integration technology and device, 201210581015.2 flue gas ammonia process desulfurization deslagging system, sulfur dioxide in the patent 201310233883.6 combination desorption flue gas, the absorption tower of nitrogen oxide, a no filler sky tower sprays type ammonia process flue gas desulphurization unit of patent 200910198724.6, other similar wet flue gas desulfurization also generally sets up the oxidation air, this point has great difference.
Drawings
FIG. 1 is a schematic diagram of an ammonia slip control system according to the present invention.
Wherein the reference numbers are as follows:
the absorption tower comprises an absorption tower 101, a tail exhaust fan 102, a tail exhaust chimney 103, a tail exhaust chimney damper 104, a first chamber 105, a second chamber 106, an exhaust port 107, an outlet flue pipe 108, a fan pipeline 109, an inlet flue pipe 110, an outlet flue damper 111, an inlet flue damper 112, an absorbent liquid tank 113, an absorbent delivery pump 114, an absorbent delivery pipe 115, a connecting interface 116, a liquid tank remote liquid level meter 117, an absorbent circulating pump 118, a circulating delivery pipe 119, a spraying pipe 120, a nozzle 121, a water tank 122, a water pump 123, a water pipe 124, a demister 125, a spray head 126, a connecting pipe 127, a water replenishing valve 128, an exhaust pump 129 and an exhaust pipe 130.
Detailed Description
In order to make the technical means, the inventive features, the objectives and the effects of the invention easily understood and appreciated, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the specific drawings, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments.
All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The invention provides an ammonia escape control system, aiming at adopting a flue system, an absorbent conveying system, an absorbent absorbing system, a byproduct processing system and a water conveying system which are independently arranged to be matched and connected with an absorption tower, reducing the concentration of ammonia in the absorption tower, ensuring that a cement plant can realize ultralow emission of nitrogen oxides on the basis of lowest cost, simultaneously controlling ammonia escape emission to be below national standards, and having simple structure and convenient use.
As shown in fig. 1, an ammonia slip control system includes an absorption tower 101, and a flue system, an absorbent delivery system, an absorbent absorption system, a byproduct treatment system, and a water delivery system respectively connected to the absorption tower 101, wherein a control terminal respectively controls and connects the flue system, the absorbent delivery system, the absorbent absorption system, the byproduct treatment system, and the water delivery system.
The flue system comprises a tail exhaust fan 102, a tail exhaust chimney 103 and a tail exhaust chimney damper 104, wherein the tail exhaust chimney damper 104 is installed inside the tail exhaust chimney 103 to divide the interior of the tail exhaust chimney 103 into a first chamber 105 and a second chamber 106, one end of the tail exhaust chimney 103 close to the first chamber 105 is provided with an exhaust port 107 and is connected with an outlet flue pipe 108 communicated with an outlet of the absorption tower 101, and one end of the tail exhaust chimney 103 close to the second chamber 106 is connected with a fan pipeline 109 communicated with the tail exhaust fan 102 and an inlet flue pipe 110 communicated with the tower body of the absorption tower 101;
the control terminal is a PC terminal;
an outlet flue damper 111 is mounted inside the outlet flue pipe 108, and an inlet flue damper 112 is mounted inside the inlet flue pipe 110;
the control terminal respectively controls the opening or closing of the tail smoke chimney baffle door 104, the outlet smoke chimney baffle door 111 and the inlet smoke chimney baffle door 112, so that smoke circulation and smoke direction adjustment are facilitated, when the tail smoke ventilator 102 is started to accelerate smoke circulation, the tail smoke chimney baffle door 104 and the outlet smoke chimney baffle door 111 are in a closed state at first, the inlet smoke chimney baffle door 112 is opened, and after smoke enters the absorption tower 101 for reaction, the outlet smoke chimney baffle door 111 is opened, so that clean smoke flows to the first chamber 105 and is discharged through the exhaust port 107;
the outlet flue pipe 108 and the inlet flue pipe 110 adopt a steel flue, the steel flue is connected with the absorption tower 101 and the tail smoke chimney 103 in an airtight welding mode or a flange connection mode, the outlet flue pipe 108 and the inlet flue pipe 110 provide low-level drainage measures and carry out anti-corrosion treatment, and support reinforcements are arranged inside the outlet flue pipe 108 and the inlet flue pipe 110 for reinforcement to ensure that the flue is stable and durable;
in the existing cement plant process system, the flue gas is directly discharged into the atmosphere through a chimney, the flue gas in the technical scheme firstly enters the absorption tower 101 through an inlet flue pipe 110 on a tail discharge chimney 103 for reaction, and the reacted clean flue gas returns to the tail discharge chimney 103 through an outlet flue pipe 108 for standard discharge.
The absorbent conveying system comprises an absorbent liquid tank 113, an absorbent conveying pump 114 and an absorbent conveying pipeline 115, wherein the absorbent conveying pump 114 is connected to the absorbent conveying pipeline 115, and two ends of the absorbent conveying pipeline 115 are respectively communicated with the absorption tower 101 and the absorbent liquid tank 113;
the absorbent liquid tank 113 is provided with a connecting interface 116, the connecting interface 116 is externally connected with a liquid inlet device, the absorbent is arranged in the liquid inlet device, and the liquid inlet device conducts introduction of the absorbent through the connecting interface 116 and the absorbent liquid tank 113;
the absorbent liquid tank 113 is provided with a liquid tank remote transmission liquid level meter 117, the liquid tank remote transmission liquid level meter 117 is connected with the control terminal to realize data interaction, and the liquid tank remote transmission liquid level meter 117 detects liquid level data of the absorbent in the absorbent liquid tank 113 in real time and sends the liquid level data to the control terminal for monitoring so as to supplement the absorbent;
the control terminal is connected with an absorbent delivery pump 114 in a control mode, fresh absorbent is introduced into the absorption tower 101, and the concentration of ammonia gas is reduced through the reaction of the absorbent and flue gas in the absorption tower 101;
the absorbent is mainly provided according to the numerical value of ammonia escape in on-line monitoring, and when the numerical value of ammonia escape in on-line monitoring rises, fresh absorbent can be judged and supplemented in time to ensure that the numerical value of ammonia escape reaches the standard.
Wherein, two absorbent conveying pipelines 115 are arranged in parallel, and each absorbent conveying pipeline 115 is connected with an absorbent conveying pump 114.
The absorbent absorption system comprises an absorbent circulating pump 118, a circulating conveying pipeline 119 and a spraying assembly, the spraying assembly comprises a spraying pipeline 120 arranged inside the absorption tower 101 and a nozzle 121 arranged on the spraying pipeline 120, the absorbent circulating pump 118 is connected to the circulating conveying pipeline 119, two ends of the circulating conveying pipeline 119 are respectively communicated with the absorption tower 101 and the spraying pipeline, the nozzle 121 is arranged on the upper side of the connection part of the circulating conveying pipeline 119 and the absorption tower 101, and the nozzle 121 is used for spraying an absorbent out to be convenient for reacting with ammonia in flue gas;
the absorbent is kept at the bottom of the absorption tower 101 after entering the absorption tower 101, the absorbent is pumped by the absorbent circulating pump 118 and is guided to the nozzle 121 to be sprayed out, and the absorbent continuously contacts with the flue gas in the reverse direction to react when falling due to gravity, so that the reaction efficiency with the ammonia gas is improved, the full reaction is facilitated, and the escaped ammonia is removed;
the control terminal is connected with an absorbent circulating pump 118.
Wherein, a plurality of spray pipelines 120 are arranged and installed above the middle part of the absorption tower 101, and each spray pipeline 120 is provided with a plurality of nozzles 121;
one end of the spray pipe 120 extending out of the absorption tower 101 is communicated with a circulating conveying pipe 119.
Wherein, water conveying system contains water tank 122, water pump 123, water pipe 124, defroster 125, and defroster 125 installs in the inside of absorption tower 101 and sets up in the upside of nozzle 121, installs shower nozzle 126 on defroster 125, and water pump 123 is connected on water pipe 124, and the both ends of water pipe 124 communicate with defroster 125, water tank 122 respectively, and water spouts into absorption tower 101 through shower nozzle 126, guarantees that flue gas liquid droplet content is not more than 75mg/Nm3(dry basis);
the water tank 122 is provided with a connecting pipe 127, the connecting pipe 127 is provided with a water replenishing valve 128, and the other end of the connecting pipe 127 is externally connected with a water inlet device;
a water level remote transmission liquid level meter is arranged on the water tank 122, the water level remote transmission liquid level meter is connected with a control terminal to realize data interaction, and the water level remote transmission liquid level meter detects liquid level data of water in the water tank 122 in real time and sends the liquid level data to the control terminal for monitoring so as to supplement the water;
the control terminal is respectively connected with the water pump 123, the demister 125 and the water replenishing valve 128 in a control mode;
the water conveying system mainly ensures that the moisture content of the flue gas reaches the standard after ammonia is removed and other impurity gases are removed, and after water is sprayed into the flue gas through the water pump 123, the content of liquid drops in the flue gas can be ensured to be not more than 75mg/Nm3(dry basis) and emission monitoring smoke values reach the standard.
Wherein, two water pipes 124 are arranged in parallel, and each water pipe 124 is connected with a water pump 123;
the demister 125 is provided in plurality, and each demister 125 is provided with a plurality of spray heads 126.
The byproduct treatment system comprises a discharge pump 129 and a discharge pipe 130, wherein the discharge pump 129 is connected to the discharge pipe 130, one end of the discharge pipe 130 is connected to the bottom of the absorption tower 101, the other end of the discharge pipe 130 is externally connected with a byproduct treatment device, the byproduct treatment device is mainly a plant area treatment process system and comprises the collection and disposal of whole plant water sources, and the specific process is mature and reliable for a cement plant;
the byproduct treatment system is mainly operated by monitoring an ammonia escape value on line through observing a plant area, when the ammonia escape value rises, the discharge pump 129 can be started regularly to discharge liquid in the absorption tower 101, the absorbent absorption system is operated, and a fresh absorbent is supplemented to ensure the stable operation of the ammonia removal system so as to ensure the standard reaching of the ammonia escape monitored on line.
In a second aspect, a second embodiment, a method for ammonia slip control, comprising:
step 1: the flue gas is introduced into the absorption tower 101 and stored in the second chamber 106, the control terminal controls the closing of the tail flue damper 104 and the outlet flue damper 111, controls the opening of the inlet flue damper 112, introduces the flue gas into the absorption tower 101 for reaction, and when the tail exhaust fan 102 is started to accelerate the circulation of the flue gas;
step 2: the absorbent is introduced into the absorption tower 101 and stored in the absorbent liquid tank 113, the control terminal controls the absorbent conveying pump 114 to be started to introduce the absorbent into the absorption tower 101 from the absorbent liquid tank 113, and the absorbent reacts with part of the flue gas in the absorption tower 101;
and step 3: spraying an absorbent, wherein the control terminal controls an absorbent circulating pump 118 to be started to introduce the absorbent at the bottom of the absorption tower 101 into a nozzle 120 for spraying, and the sprayed absorbent is fully reacted with the flue gas in the absorption tower 101 so as to be conveniently reacted with ammonia gas in the flue gas;
water is introduced into the absorption tower 101 and stored in the water tank 122, the control terminal controls the water pump 123 to be started to introduce the water from the water tank 112 into the spray head 126 for spraying, and the sprayed water is fully mixed with the flue gas in the absorption tower 101;
and 4, step 4: when the reaction is finished, the flue gas is reacted into clean flue gas, the control terminal controls the opening of the outlet flue damper 111, the clean flue gas flow is discharged through the exhaust port 107 after being led into the first chamber 103, and the tail flue damper 104 is in a closed state.
Wherein, a byproduct is generated in the absorption tower after the reaction in the step 4 is completed, and the treatment steps of the byproduct are as follows: the control terminal controls the discharge pump 129 to be turned on, and the discharge pump 129 discharges the by-product in the absorption tower 101 to the by-product treatment apparatus through the discharge pipe 130.
In conclusion, the ammonia escape control system and the ammonia escape control method can be used for reducing the concentration of ammonia in the absorption tower by adopting the flue system, the absorbent conveying system, the absorbent absorption system, the byproduct treatment system and the water conveying system which are independently arranged to be matched and connected with the absorption tower, ensure that the cement plant can realize ultralow emission of nitrogen oxides on the basis of the lowest cost and simultaneously control ammonia escape emission to be below the national standard, and have simple structure and convenient use.
Specific embodiments of the invention have been described above. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; various changes or modifications may be made by one skilled in the art within the scope of the claims without departing from the spirit of the invention, and without affecting the spirit of the invention.
Claims (11)
1. An ammonia escape control system is characterized by comprising an absorption tower, a flue system, an absorbent conveying system, an absorbent absorption system, a byproduct treatment system and a water conveying system, wherein the flue system, the absorbent conveying system, the absorbent absorption system, the byproduct treatment system and the water conveying system are respectively connected to the absorption tower, and a control terminal is respectively connected with the flue system, the absorbent conveying system, the absorbent absorption system, the byproduct treatment system and the water conveying system in a control mode.
2. The ammonia escape control system of claim 1, wherein the flue system comprises a tail exhaust fan, a tail exhaust chimney and a tail exhaust chimney baffle door, the tail exhaust chimney baffle door is installed inside the tail exhaust chimney to divide the interior of the tail exhaust chimney into a first chamber and a second chamber, an exhaust port is formed at one end of the tail exhaust chimney close to the first chamber and is connected with an outlet flue pipe communicated with the absorption tower, and a fan pipeline communicated with the tail exhaust fan and an inlet flue pipe communicated with the absorption tower body are connected at one end of the tail exhaust chimney close to the second chamber;
an outlet flue damper is arranged in the outlet flue pipe, and an inlet flue damper is arranged in the inlet flue pipe;
and the control terminal is respectively connected with the tail smoke chimney baffle door, the outlet flue baffle door and the inlet flue baffle door in a control mode.
3. An ammonia escape control system as claimed in claim 1 or 2, wherein said absorbent delivery system comprises an absorbent liquid tank, an absorbent delivery pump, and an absorbent delivery pipeline, said absorbent delivery pump is connected to said absorbent delivery pipeline, and both ends of said absorbent delivery pipeline are respectively communicated with said absorption tower and said absorbent liquid tank;
the absorbent liquid box is provided with a connecting interface which is externally connected with a liquid inlet device;
a liquid tank remote transmission liquid level meter is arranged on the absorbent liquid tank, and the liquid tank remote transmission liquid level meter is connected with the control terminal to realize data interaction;
the control terminal is connected with the absorbent delivery pump in a control mode.
4. An ammonia slip control system as claimed in claim 3, wherein two absorbent delivery lines are provided in parallel, each absorbent delivery line being connected to an absorbent delivery pump.
5. The ammonia slip control system according to claim 1, 2 or 4, wherein the absorbent absorption system comprises an absorbent circulation pump, a circulation delivery pipe, and a spray assembly, the spray assembly comprises a spray pipe disposed inside the absorption tower and a nozzle installed on the spray pipe, the absorbent circulation pump is connected to the circulation delivery pipe, both ends of the circulation delivery pipe are respectively communicated with the absorption tower and the spray pipe, and the nozzle is disposed on the upper side of the connection of the circulation delivery pipe and the absorption tower;
the control terminal is connected with the absorbent circulating pump in a control mode.
6. The ammonia escape control system of claim 5, wherein said spray lines are provided in a plurality and installed above the middle of said absorber tower, each of said spray lines having a plurality of spray nozzles installed thereon;
and one end of the spraying pipeline extending out of the absorption tower is communicated with the circulating conveying pipeline.
7. The ammonia escape control system as claimed in claim 1, 2, 4 or 6, wherein said water delivery system comprises a water tank, a water pump, a water pipe, and a demister, said demister is installed inside said absorption tower and disposed above said nozzle, said demister is installed with a spray head, said water pump is connected to said water pipe, and two ends of said water pipe are respectively communicated with said demister and said water tank;
the water tank is provided with a connecting pipe, the connecting pipe is provided with a water replenishing valve, and the other end of the connecting pipe is externally connected with a water inlet device;
a water level remote transmission liquid level meter is arranged on the water tank and is connected with the control terminal to realize data interaction;
the control terminal is respectively connected with the water pump, the demister and the water replenishing valve in a control mode.
8. An ammonia escape control system as claimed in claim 7, wherein two of said water pipes are arranged side by side, each of said water pipes being connected to said water pump;
the defroster is provided with a plurality ofly, every all be equipped with a plurality of shower nozzles on the defroster.
9. An ammonia slip control system as claimed in claim 1, 2, 4, 6 or 8, wherein said byproduct disposal system comprises a discharge pump, a discharge pipe, said discharge pump being connected to said discharge pipe, one end of said discharge pipe being connected to the bottom of said absorption tower, and the other end of said discharge pipe being externally connected to a byproduct disposal device.
10. An ammonia slip control method, comprising the steps of:
step 1: introducing flue gas into the absorption tower, storing the flue gas in a second chamber, controlling a tail discharge chimney baffle door and an outlet flue baffle door to be closed by a control terminal, controlling the inlet flue baffle door to be opened, and introducing the flue gas into the absorption tower for reaction;
step 2: the method comprises the following steps that an absorbent is introduced into an absorption tower, the absorbent is stored in an absorbent liquid box, a control terminal controls an absorbent conveying pump to be started to introduce the absorbent into the absorption tower from the absorbent liquid box, and the absorbent reacts with part of smoke in the absorption tower;
and step 3: spraying an absorbent, wherein the control terminal controls an absorbent circulating pump to be started to introduce the absorbent at the bottom of the absorption tower into a nozzle for spraying, and the sprayed absorbent fully reacts with the flue gas in the absorption tower;
water is introduced into the absorption tower and stored in the water tank, the control terminal controls the water pump to be started to introduce the water from the water tank into the spray head for spraying, and the sprayed water is fully mixed with the flue gas in the absorption tower;
and 4, step 4: when the reaction is finished, the flue gas is reacted into clean flue gas, the control terminal controls the opening of the outlet flue damper, the clean flue gas flow is discharged through the exhaust port after being introduced into the first chamber, and at the moment, the tail exhaust flue damper is in a closed state.
11. The method of claim 10, wherein a byproduct is generated in the absorber after the reaction in step 4, and the byproduct is treated by the following steps: and the control terminal controls the discharge pump to be started, and the discharge pump discharges the by-product in the absorption tower to the by-product treatment device through the discharge pipe.
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| CN202010113911.0A CN111068502A (en) | 2020-02-24 | 2020-02-24 | Ammonia escape control system and control method |
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| CN202010113911.0A CN111068502A (en) | 2020-02-24 | 2020-02-24 | Ammonia escape control system and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113019089A (en) * | 2021-03-26 | 2021-06-25 | 昆岳互联环境技术(江苏)有限公司 | Ammonia flue gas desulfurization device with one-key start-stop control system |
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