CN203663694U - Cement kiln SNCR flue gas denitration system for improving denitration security - Google Patents
Cement kiln SNCR flue gas denitration system for improving denitration security Download PDFInfo
- Publication number
- CN203663694U CN203663694U CN201320800162.4U CN201320800162U CN203663694U CN 203663694 U CN203663694 U CN 203663694U CN 201320800162 U CN201320800162 U CN 201320800162U CN 203663694 U CN203663694 U CN 203663694U
- Authority
- CN
- China
- Prior art keywords
- denitration
- ammonia
- module
- ammoniacal liquor
- spray equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a cement kiln SNCR flue gas denitration system for improving denitration security. The denitration system comprises a decomposing furnace, a reductive agent allocating module, a denitration control module, a soft water convey module, an aqua ammonia supply module, a first spray device of an aqua ammonia discharge module, a temperature sensor, a pressure sensor and a safety drainage valve that are positioned at the top part of an aqua ammonia storage tank, a second spray device above the aqua ammonia storage tank, a first ammonia leakage detector and a first audible and visual alarm of an aqua ammonia convey module, and a second ammonia leakage detector, a second audible and visual alarm and exhaust fans of the reductive agent allocating module, wherein the temperature sensor, the pressure sensor, the first ammonia leakage detector and the second ammonia leakage detector are all connected with the denitration control module; the safety drainage valve, the second spray device, the first audible and visual alarm, the second audible and visual alarm and the exhaust fans are all connected with the denitration control module. The denitration system reduces potential risks when aqua ammonia is adopted as the reductive agents, and solves the technical problem of low security of Chinese cement kiln SNCR denitration projects.
Description
Technical field
The utility model relates to cement production process during Heat Treatment and discharges safety and environment protection subject in gas treatment operation, is specifically related to a kind of cement furnace SNCR flue gas denitrification system that improves denitration security.
Background technology
The SNCR denitration technology at home and abroad utilization in cement industry furnace flue gas denitration engineering is the most extensive.Cement furnace SNCR denitration system reducing agent mainly contains two kinds, ammoniacal liquor and urea: cement producing line adopts urea as reducing agent except projects such as Fujian dragon unicorn cement, Dujiang weir Lafarge cement at home, and the most of ammoniacal liquor that adopts of other cement production enterprise is as reducing agent.In October, 2012, there is ammoniacal liquor explosion accident and cause 2 people's death in cement plant, Fujian, on June 3rd, 2013, it is wrecked that the especially big explosion accident of Jilin Qin Ye Co., Ltd liquefied ammonia causes 119 people, causes cement denitrating system to use ammoniacal liquor to attract wide attention as the security of system of reducing agent.
According to " hazardous chemical register " (2008), 20～25% ammoniacal liquor belong to hazardous chemical; According to " hazardous chemical Major Hazard Installations Identifying " (GB18218-2009), ammoniacal liquor is not incorporated into as major hazard source; According to " quantitative criteria of first batch of hazardous chemical use amount ", ammoniacal liquor is not put into register, and clause regulation enterprise does not handle " hazardous chemical safe handling licensing "; As using enterprise, need to meet relevant storage and the use regulations of " safety management of dangerous chemical products regulations " (No. 591st, State Council Decree).
Ammoniacal liquor easily decomposes and emits ammonia, and temperature is higher, and decomposition rate is faster, can form explosive atmosphere.If meet high heat, in container, press and increase, there is the danger of cracking and blast.SNCR adopts and makes reducing agent ammonia concn 20～25%, do not reach the degree that country classifies ammonia solution [35%< is containing ammonia≤50%] as hazardous chemical, but owing to there being the factor of ammoniacal liquor ammonia volatilization volumetric concentration explosion limit 15～20%, to ammoniacal liquor system enhancement security measures.
Ammoniacal liquor is inflammable, poisonous, has irritating hazardous chemical, when human body inhalation of low concentration ammonia has spread effect to mucous membrane, sucks high strength ammonia and can cause histolysis necrosis; Ammonia and air mixing energy form explosive mixture, and chance naked light, high heat may cause combustion explosion.
Cement denitration is owing to being used ammoniacal liquor as reducing agent, and the danger that may exist is mainly that the leakage of ammoniacal liquor sets off an explosion or hazard to person.Leakage point is mainly in storage tank and pipeline pipe fitting junction, as: in filling process because careless manipulation or maloperation cause leakage; Storage tank, valve, pipeline and annex cause leakage because of corrosion and damage; Not in place or the repair quality problem of operational inspection, causes equipment to sew.In addition, also have and seldom occur but potential dangerous matter sources: Yin Gaowen, thunderbolt, excessive storage or the blast of other force majeure initiation storage tank; Operation and maintenance regular working are not in place, cause ammonia district device damage, and Shi An district can not normally move; Transport tank car freight volume transfinite or plant maintenance improper, leak, on fire from explosion.At present, there is no the patent for cement denitration security measures specially.
Utility model content
The utility model provides a kind of cement furnace SNCR flue gas denitrification system that improves denitration security, uses ammoniacal liquor as the potential danger of reducing agent for reducing as far as possible, solves the not high technical problem of Chinese cement stove SNCR denitration engineering safety.
Improve a cement furnace SNCR flue gas denitrification system for denitration security, comprise dore furnace, reducing agent distribution module, connect reducing agent distribution module and dore furnace spray gun, denitration control module, pass through reducing agent distribution module soft water conveyor module and ammoniacal liquor feed system in parallel; Described ammoniacal liquor feed system comprises the ammoniacal liquor tank car, ammoniacal liquor Unload module, tank used for storing ammonia and the ammoniacal liquor conveyor module that connect successively, and described ammoniacal liquor conveyor module is connected with reducing agent distribution module;
Described ammoniacal liquor Unload module top is provided with the first spray equipment, described tank used for storing ammonia top is provided with temperature sensor, pressure sensor and the unrestrained valve of safety, described tank used for storing ammonia top is provided with the second spray equipment, described ammoniacal liquor conveyor module place is provided with the first ammonia leakage detector and first sound light crossing-signal, and described ammoniacal liquor conveyor module top is provided with the 4th spray equipment;
Described reducing agent distribution module place is provided with the second ammonia leakage detector, rising tone light crossing-signal and exhaust fan;
Described temperature sensor, pressure sensor, the first ammonia leakage detector and the second ammonia leakage detector all communicate to connect to denitration control module;
The switch of described the second spray equipment, the 4th spray equipment, first sound light crossing-signal, rising tone light crossing-signal and exhaust fan is all connected and is controlled by denitration control module.
The temperature information that temperature sensor detects in tank used for storing ammonia is transferred to denitration control module, and denitration control module is controlled the start and stop of the second spray equipment automatically according to the temperature signal collecting, tank used for storing ammonia is lowered the temperature; The pressure information that pressure sensor detects in tank used for storing ammonia is transferred to denitration control module, by the pressure information in denitration control module monitoring tank used for storing ammonia; The pressure size according in tank used for storing ammonia of the unrestrained valve of safety is automatically opened or closes, and carries out step-down.
Described ammoniacal liquor Unload module comprises de-ballast pump, unloading pipeline, corresponding valve and table meter, connector is more, leak than being easier to that ammonia occurs, therefore above ammoniacal liquor Unload module, spray equipment is set, start if desired spray equipment the ammonia leaking is carried out to spray-absorption.
Ammoniacal liquor conveyor module comprises ammoniacal liquor delivery pump, ammoniacal liquor conveyance conduit, corresponding valve and table meter, connector is relatively also more, leak than being easier to that ammonia occurs, therefore at ammoniacal liquor conveyor module place, the first ammonia leakage detector is set, the first ammonia leakage detector detects ammoniacal liquor Unload module and near the airborne ammonia concentration information of ammoniacal liquor conveyor module, be transferred to denitration control module, denitration control module can be set the high alarm signal of ammonia concentration, according to this ammonia concentration information, control the start and stop of first sound light crossing-signal, the spray equipment of reminding staff to open ammoniacal liquor Unload module top carries out spray-absorption, start the second spray module and the 4th spray module simultaneously.
The main part of described reducing agent distribution module can adopt conventional reducing agent distribution module, and the utility model is set up ammonia leakage detector, audible-visual annunciator, emergency stop switch and exhaust fan at reducing agent distribution module place.
Described reducing agent distribution module comprises that reducing agent distributes cabinet and is arranged on the duct in reducing agent dispensing cabinet, exhaust fan is arranged on the top that reducing agent distributes cabinet, the second ammonia leakage detector is arranged on reducing agent and distributes in cabinet, and rising tone light crossing-signal is arranged on reducing agent and distributes cabinet top.
Female pipe is upper to be flowed to and sets gradually the first manual ball valve, pneumatic shut-off valve, first flow meter, pneumatic control valve along ammoniacal liquor, pneumatic shut-off valve is connected compressed air line with pneumatic control valve, ball valve is set on compressed air line, the port of export of female pipe connects some Zhi Zhiguan by joint, a spray gun of every corresponding connection of arm, flows to and sets gradually needle-valve, the second flowmeter and the second manual ball valve along ammoniacal liquor on every arm.Pneumatic shut-off valve, pneumatic control valve, first flow meter, the second ammonia leakage detector, rising tone light crossing-signal are all connected to denitration control module.
Reducing agent distribution module nipple is more, to leak local than being easier to that ammonia occurs, the second ammonia leakage detector and rising tone light crossing-signal are set herein, the second ammonia leakage detector detects reducing agent and distributes the ammonia concentration in cabinet and be transferred to denitration control module, denitration control module starts rising tone light crossing-signal and reminds staff, automatically starts exhaust fan simultaneously.
In the utility model, denitration control module adopts the conventional conventional control appliance in this area, and as preferably, described denitration control module is DCS controller.Also can adopt PLC controller.
While there is ammonia leakage, operating personnel may, owing to not being with safety goggles to cause eyes discomfort, therefore, preferably, also be provided with the 3rd spray equipment for emergency processing near described tank used for storing ammonia, and the 3rd spray equipment connects tank from the beginning.The 3rd spray equipment cleans the purposes such as eyes for operating personnel.
As preferably, described ammoniacal liquor Unload module, ammoniacal liquor conveyor module, reducing agent distribution module and soft water conveyor module place are equipped with scram button.In the time being in an emergency, can be by the scram button of this module of direct control, emergent stopping.
As preferably, described the second spray equipment and the 4th spray equipment are all with magnetic valve, and described magnetic valve connects and be controlled by denitration control module.
Further preferably, the front and back of described magnetic valve are also provided with manual ball valve, on the inlet channel between shower nozzle and the corresponding magnetic valve of described the second spray equipment and the 4th spray equipment, are connected with bypass duct, and this bypass duct is provided with bypass ball valve.Corresponding bypass is set, so that on-line maintenance when solenoid valve failure, also can prevent that power-off electric magnet valve is failure to actuate time, can manually boot the second spray equipment, the spray face of the second spray equipment covers the whole top of tank used for storing ammonia.
The effect of the first spray equipment is to absorb the ammonia that leak at ammoniacal liquor Unload module place; The effect of the second spray equipment is mainly the ammonia that absorbing ammonia water storage tank leaks, and tank used for storing ammonia is lowered the temperature, and therefore, described the first spray equipment is all connected tank from the beginning with the second spray equipment.
As preferably, described tank used for storing ammonia below is provided with accident pool, and described accident pool comprises the cover plate at top at the bottom of the pond body that locates below ground level and pond, and described tank used for storing ammonia is installed on described cover plate.
Further preferably, described cover plate top is provided with the cofferdam of arranging around described tank used for storing ammonia, and bottom, described cofferdam is provided with manhole, and manhole place correspondence is provided with manhole door.
Further preferably, described the first spray equipment, the 3rd spray equipment and the 4th spray equipment below are equipped with shower water gathering-device, and this shower water gathering-device is by extremely described accident pool of pipeline communication.
The ammoniacal liquor that accident pool leaks for collecting shower water and tank used for storing ammonia, the shower water of the first spray equipment, the 3rd spray equipment and the 4th spray equipment enters in accident pool by connecting pipe, and the shower water of the second spray equipment flows in accident pool certainly by cofferdam.Cofferdam can also prevent from when tank used for storing ammonia from leaking ammoniacal liquor overflowing outside accident pool.Accident pool is arranged in the ground of tank used for storing ammonia below, saves and takes up an area space.Described cofferdam and cover plate are preferably integrative-structure.
Further preferably, described manhole is set to two, and two manholes distribute axisymmetricly.
Further preferably, described manhole is of a size of 800mm × 800mm.
Further preferably, the pond body bulk of described accident pool is not less than the dischargeable capacity of tank used for storing ammonia, is provided with some for supporting the pillar of cover plate in the body of described pond.Shore supports cover plate, the stability of enhancing tank used for storing ammonia.
Described accident pool is provided with accident excavationg pump, and the liquid of collecting in accident pool is drawn back the reuse of ammoniacal liquor tank car by this accident excavationg pump.
The air outlet of dore furnace of the present utility model connects preheater, conditioning Tower, electric cleaner and kiln tail chimney successively by pipeline, kiln tail chimney is provided with the escaping of ammonia in-line analyzer and flue gas continuous on-line analysis instrument (CEMS), and the escaping of ammonia in-line analyzer and flue gas continuous on-line analysis instrument (CEMS) all communicate to connect to denitration control module.
In dore furnace, denitration flue gas after treatment is discharged by kiln tail chimney after preheater preheating, conditioning Tower humidification, electric cleaner dedusting, flue gas continuous on-line analysis instrument (CEMS) detects the Gas Parameters (flue gas flow, nitrous oxides concentration, temperature, oxygen, pressure, the escaping of ammonia concentration etc.) in flue gas in kiln tail chimney, and this Gas Parameters is delivered to denitration control module, denitration control module is according to spray feed amount and the spray feed scheme of flue gas continuous on-line analysis instrument (CEMS) feedack control reducing agent distribution module ammoniacal liquor.
The control relation cooperatively interacting between CEMS and denitration control module adopts the control method of this area routine.
The escaping of ammonia in-line analyzer detects the content of ammonia in flue gas in kiln tail chimney, and is transferred to denitration control module, and in the time that ammonia content exceedes setting value, denitration control module starts system protection and stops, and startup system is simultaneously cleaned.
Preferably, described spray gun is set to some, and a part is connected in the air-out flue of dore furnace, and a part is connected in the burner hearth of dore furnace.As preferably, described reducing agent distribution module place is provided with red accident emergency button.Operate this redness accident emergency button, stop rapidly a whole set of denitrating system.
The beneficial effect the utlity model has is:
(1) selected technology, is applicable to the security measures of all employing ammoniacal liquor as the cement clinker production line SNCR flue gas denitrification system of reducing agent;
(2) maltilevel security protection, takes precautions against all dangerous factors that can predict the most reliably;
(3) full automatic safe emergency measure, can be in the Central Control Room operation interface monitoring source that is potentially dangerous, and automatically starts safe precaution measure, is the safe emergency measure of effectively start;
(4) security of not only raising system operation, has also improved operation patrol officer's operating environment.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the annexation figure of dore furnace of the present utility model and other equipment.
Fig. 3 is process chart of the present utility model.
Fig. 4 is the utility model accident pool and cofferdam integral structure schematic diagram.
Fig. 5 is the top view shown in Fig. 4.
Fig. 6 is the structural representation of the utility model reducing agent distribution module.
1-owner's demineralized water storage tank 2-soft water storage tank 3-soft water conveyor module
4-reducing agent distribution module 5-the 3rd spray equipment 6-tank from the beginning
7-the second spray equipment 8-temperature sensor 9-pressure sensor
10-compressed air reservoir 11-denitration control module 12-tank used for storing ammonia
13-ammoniacal liquor conveyor module 14-accident pool 15-ammoniacal liquor Unload module
16-the first spray equipment 17-kiln tail chimney 18-the escaping of ammonia in-line analyzer
19-second ammonia water spray section 20-dore furnace 21-the first ammonia water spray section
22-spray gun 23-exhaust fan 24-preheater
25-conditioning Tower 26-raw mill 27-electric cleaner
28-the 4th spray equipment.
Detailed description of the invention
As shown in Fig. 1～Fig. 6, a kind of cement furnace SNCR denitrating system, comprises soft water conveyor module 3, ammoniacal liquor feed system, reducing agent distribution module 4 and dore furnace 20.
Soft water conveyor module 3 connects soft water storage tank 2, and soft water storage tank connects owner's demineralized water storage tank 1, and soft water conveyor module comprises valve and the table meter of soft water delivery pump, soft water pipeline, correspondence; Soft water pipeline connects reducing agent distribution module 4.
Ammoniacal liquor feed system comprises the ammoniacal liquor tank car 17, ammoniacal liquor Unload module 15, tank used for storing ammonia 12 and the ammoniacal liquor conveyor module 13 that connect successively, and ammoniacal liquor conveyor module 13 connects reducing agent distribution module 4.
Ammoniacal liquor Unload module 15 comprises ammoniacal liquor de-ballast pump, ammoniacal liquor pipeline, pipeline valve, the anxious scram button stopping of control pipeline valve, and ammoniacal liquor pipeline and pipeline valve top are provided with the first spray equipment 16, and the water inlet pipe of this first spray equipment connects tank 6 from the beginning.
The ammoniacal liquor pipeline of ammoniacal liquor Unload module 15 is connected to tank used for storing ammonia 12, tank used for storing ammonia 12 tops are provided with temperature sensor 8(TI), pressure sensor 9(PI) and safety unrestrained valve (not shown, temperature sensor 8 adopts thermocouple, the top of tank used for storing ammonia 12 is provided with the second spray equipment 7, the water inlet pipe of this second spray equipment 7 connects tank 6 from the beginning, on the water inlet pipe of the second spray equipment 7 with magnetic valve, the front and back of magnetic valve are furnished with manual ball valve, and be furnished with bypass, magnetic valve connects denitration control module 11.
The below of tank used for storing ammonia 12 is provided with accident pool 14, accident pool 14 comprises the cover plate 1402 at top at the bottom of the pond body 1403 that locates below ground level and pond, tank used for storing ammonia is installed on cover plate 1402, cover plate 1402 tops are provided with the cofferdam 1401 arranging around tank used for storing ammonia, this cofferdam is around the home in tank used for storing ammonia periphery, cofferdam and cover plate are structure as a whole, bottom, cofferdam (being on cover plate) is provided with manhole 1405, manhole is set to two, two manholes distribute axisymmetricly, manhole is of a size of 800mm × 800mm, manhole place correspondence is provided with manhole door, the pond body bulk of accident pool is not less than the dischargeable capacity of tank used for storing ammonia, in the body of pond, be provided with some for supporting the pillar 1404 of cover plate.
Accident pool is furnished with accident excavationg pump, and the liquid of collecting in accident pool is drawn back the reuse of ammoniacal liquor tank car by this accident excavationg pump.
Ammoniacal liquor in tank used for storing ammonia 12 is sent in reducing agent distribution module 4 by ammoniacal liquor conveyor module 13, ammoniacal liquor conveyor module 13 comprises ammoniacal liquor delivery pump, some ammoniacal liquor pipelines parallel with one another, correspondence is arranged on the valve on each ammoniacal liquor pipeline, control the anxious scram button stopping of all valves herein, be provided with the first ammonia leakage detector (ASI) and first sound light crossing-signal at these ammoniacal liquor conveyor module 13 places, ammoniacal liquor pipeline in parallel gathers rear connection reducing agent distribution module 4, ammoniacal liquor conveyor module 13 tops are provided with the 4th spray equipment 28, the inlet channel of the 4th spray equipment 28 connects tank 6 from the beginning, on inlet channel with magnetic valve, the front and back of magnetic valve are furnished with manual ball valve, and is furnished with bypass, magnetic valve connects denitration control module 11.
The main part of reducing agent distribution module 4 can adopt conventional reducing agent distribution module, and the utility model is set up the second ammonia leakage detector (ASI), rising tone light crossing-signal and exhaust fan 23 at reducing agent distribution module place.
Reducing agent distribution module 4 comprises that reducing agent distributes cabinet 413 and is arranged on the duct in reducing agent distribution cabinet 413, exhaust fan is arranged on the top that reducing agent distributes cabinet, two fans are set, the second ammonia leakage detector (ASI) 412 is arranged on reducing agent and distributes in cabinet, and rising tone light crossing-signal 402 is arranged on reducing agent and distributes cabinet top.
Duct comprises female pipe, mother's pipe after the entrance point connection ammoniacal liquor conveyor module of this mother's pipe and soft water conveyor module export pipeline converge, female pipe is upper to be flowed to and sets gradually the first manual ball valve 408 along ammoniacal liquor, pneumatic shut-off valve 409, first flow meter 410, pneumatic control valve 411, pneumatic shut-off valve is connected compressed air line with pneumatic control valve, ball valve 407 is set on compressed air line, the port of export of female pipe connects some Zhi Zhiguan by joint, a spray gun of every corresponding connection of arm, on every arm, flow to and set gradually needle-valve 404 along ammoniacal liquor, the second flowmeter 403 and the second manual ball valve 401.Pneumatic shut-off valve, pneumatic control valve, first flow meter are all connected to denitration control module.
In reducing agent distribution cabinet, be also integrated with red accident emergency button 405 and pressure transmitter 406.
After the wind pipe of dore furnace 20, connect successively preheater 24, conditioning Tower 25, raw mill 26, electric cleaner 27 and kiln tail chimney 17, the continuous on-line monitoring system of flue gas (CEMS) and the escaping of ammonia in-line analyzer 18 are set on kiln tail chimney 17, and the continuous on-line monitoring system of flue gas (CEMS) and the escaping of ammonia in-line analyzer 18 all communicate to connect to denitration control module 11.
Near the water inlet pipe that the 3rd spray equipment 5, the three spray equipments 5 are also set tank used for storing ammonia 12 connects from the beginning tank 6, the three spray equipments 5 with control valve.
The first spray equipment 16, the 3rd spray equipment 5 and the 4th spray equipment 28 belows are equipped with shower water gathering-device, this shower water gathering-device by pipeline communication to accident pool.
Denitration control module 11 adopts conventional DCS controller, and DCS controller is provided with a total scram button, and denitration control module is arranged in denitration switch board.
Technological process of the present utility model is as follows:
By ammoniacal liquor tank car 17, the ammoniacal liquor of byproduct 20～25wt.% common in chemical process is transported to scene, inject tank used for storing ammonia 12 by ammoniacal liquor Unload module 15, due to new dry process for cement production operated by rotary motion waste heat boiler, can supply with the soft water that hardness is less than 0.03mmol/L, send into soft water storage tank 2.Ammoniacal liquor, soft water are pumped to reducing agent distribution module 4 by ammoniacal liquor, soft water conveyor module respectively.In reducing agent distribution module 4, the Gas Parameters (flue gas flow, nitrous oxides concentration, temperature, oxygen, pressure, the escaping of ammonia concentration etc.) being fed back by kiln tail chimney, the ammoniacal liquor that metering system is required, and in module, realize the distribution of each road spray gun ammonia water spray amount, be distributed to each road spray gun, deliver in dore furnace.
In addition, need draw and connect compressed air Zhi Ge road spray gun 22, single spray gun compressed air consumption 10Nm
3/ h, pressure 0.3～0.4MPa, to strengthen ammoniacal liquor range, and cooling spray gun while ensureing that reducing agent flow is too small.Spray gun 22 is arranged on dore furnace 20 tops to 850～1050 DEG C of temperature ranges of dore furnace, and spray site position is determined according to flowsheeting and experience.Flue gas after NO_x removal is discharged in air after via cyclone preheaters at different levels, waste heat boiler, conditioning Tower, raw mill, deduster, kiln tail chimney.
In running owing to using hazardous chemical (ammoniacal liquor) potential dangerous matter sources to have: the dangerous leakage that is mainly ammoniacal liquor, leakage point is mainly in storage tank and pipeline pipe fitting junction, as: 1) in filling process because careless manipulation or maloperation cause leakage; 2) storage tank, valve, pipeline and annex, because of frequent movement or corrosion and damage causes leakage; 3) the not in place or repair quality problem of operational inspection, causes equipment leakage.In addition, also have and seldom occur but potential dangerous matter sources, as: 1) Yin Gaowen, thunderbolt, excessive storage or other force majeure cause storage tank blast; 2) operation and periodic inspection work are not in place, cause ammonia district device damage, can not normally move; 3) transport tank car freight volume transfinite or plant maintenance improper, leak, on fire from explosion.
Security control mode everywhere of the present utility model is as follows:
Ammoniacal liquor Unload module: configuration shower dilution water, can detect or feel that when unloading in ammonia process ammonia district ammonia concentration is higher, the first spray equipment that can open in ammoniacal liquor Unload module absorbs to reduce the ammonia concentration leaking in environment.
When ammoniacal liquor unloading, there is strong ammoniacal liquor foul smell, unload ammonia personnel see near on ammoniacal liquor conveyor module on integrated the first ammonia leakage detector ammonia concentration numerical value directly rise to 200ppm above (full scale be 200ppm, quick-fried table), first sound light crossing-signal on ammoniacal liquor conveyor module gives the alarm, tank used for storing ammonia top the second spray equipment starts automatically, the first spray equipment in manually opened ammoniacal liquor Unload module, detect that ammonia district ammonia concentration is returned to rapidly below 100ppm, audible-visual annunciator stops, continue after 5 minutes, second spray equipment on ammonia tank top stops automatically, the all alarms of system are eliminated.Owing to unloading after instantaneity that ammonia careless manipulation causes leaks and absorbed by water, close the first spray equipment in ammoniacal liquor Unload module, ammonia district ammonia concentration still maintains below 100ppm.
Tank used for storing ammonia: tank used for storing ammonia top disposes the second spray equipment, spray face covers whole tank deck, and water source draws and connects the running water from owner, dispose magnetic valve, before and after magnetic valve, dispose manual ball valve, dispose in addition bypass, during in order to solenoid valve failure or power-off, manually opened spray equipment; Tank body top disposes the unrestrained valve of safety, in the time detecting that tank body top gaseous pressure is greater than 50bar, will automatically open and carry out pressure release; Tank body top disposes thermocouple for measuring temperature, and data can teletransmission, in the time that tank body temperature is greater than 45 DEG C, by starting the magnetic valve of storage tank top the second spray equipment, until temperature drops to 45 DEG C of <, more than lasting 10min, closed electromagnetic valve, stops spray;
Tank used for storing ammonia foundation is hollow accident pool, accident pool exceeds above ground portion and builds as cofferdam, while preventing tank body leakage, ammoniacal liquor overflows, cause plant area's dangerous or pollution on a large scale, below ground part is used for doing accident pool, under ground portion accident pool and tank used for storing ammonia isometric(al), when tank body leakage or other emergency rating, ammoniacal liquor in tank used for storing ammonia, the shower water of accident condition can drain into accident pool, accident pool also disposes accident excavationg pump, can startup accident excavationg pump after accident is got rid of, send aqua ammonia pump back to tank car or tank used for storing ammonia recycling, avoid waste and pollute, in addition, accident pool arranges cover plate, ground, cover plate absolute altitude Yu An district is concordant, cover plate reduces and falls danger on the one hand, the ammonia that can prevent and treat on the other hand accident pool evaporate in environment.
Ammonia district disposes combined type spray/eye syringe (i.e. the 3rd spray equipment): in patrol officer's Operation and Maintenance process, because not wearing mask, safety goggles, cause ammonia fumigating to eyes, eye syringe push pedal (mark has push), start eye syringe, 15 minutes eyes of clear water spray have not big harm.Patrol officer touches ammoniacal liquor accidentally, opens the 3rd spray equipment, the smooth and easy water outlet of spray head.
Ammoniacal liquor conveyor module: because ammoniacal liquor conveyor module is Continuous Running Equipment, and pipe fitting interface is more, the first ammonia leakage detector and the first sound light crossing-signal in ammonia district are integrated on ammoniacal liquor conveyor module, when the first ammonia leakage detector detects ammonia concentration >=180ppm in environment, to start first sound light crossing-signal, and second spray equipment on tank used for storing ammonia top, ammonia concentration < 180ppm detected, and continue more than 5 minutes, the second spray equipment stops automatically; When ammonia leakage detector detects ammonia concentration >=180ppm in environment, start sound and light alarm and the second spray equipment 15min, ammonia concentration does not still decline, and chain denitrating system protection stops.
Reducing agent distribution module: be Continuous Running Equipment because reducing agent distribution module has more, and pipe fitting interface is more, each junction is all leakage point dangerous matter sources.The second ammonia leakage detector of reducing agent distribution module and rising tone light crossing-signal are arranged on reducing agent and distribute cabinet cabinet inside, when detecting reducing agent, the second ammonia leakage detector distributes ammonia concentration >=150ppm in cabinet cabinet, two exhaust fans on reducing agent distribution cabinet cabinet top will be started, until ammonia concentration < 150ppm detected, and continue more than 5 minutes, exhaust fan stops automatically; Distribute ammonia concentration >=150ppm in cabinet when the second ammonia leakage detector detects reducing agent, start cabinet top exhaust fan duration >=30min, ammonia concentration does not still decline, and chain denitrating system protection stops.
Distribute cabinet cabinet inside at reducing agent, near the place of handle handled easily, be provided with red accident emergency button, when the emergency situations of various leakages, obstruction occurs, press the accident emergency button that reducing agent distributes cabinet, denitrating system stops (all devices stops, valve closing, does not start cleaning procedure) fast.
Under system normal operation, the first ammonia leakage detector detects ammonia concentration 156ppm, and reducing agent distributes the exhaust fan on cabinet cabinet top automatically to start, and after 5min, ammonia concentration drops to 30ppm.Artificial investigation, reducing agent distributes the female pipe control valve of cabinet cabinet junction to have gas leakage, leaks after eliminating, walk auto-programming and start denitrating system, reducing agent distributes ammonia in cabinet to leak concentration maintenance < 20ppm, and after 5 minutes, reducing agent distributes cabinet cabinet top exhaust fan automatically to close.
Denitration control system: be mainly made up of denitration switch board and DCS operating platform, DCS controller is arranged in denitration switch board, and denitration control system adopts conventional control mode to the control of reducing agent distribution module
Denitration switch board is positioned near denitration control room ammonia district, the level configurations that is applicable to operation in the middle of denitration switch board cabinet outside has another red accident emergency button, patrol and examine and find that tank used for storing ammonia leaks, ammoniacal liquor conveyance conduit leaks, press the accident emergency button of denitration switch board, denitrating system stops (all devices stops, valve closing, does not start cleaning procedure) fast.
DCS operating platform configuration has monitoring display screen, main flow is provided with " stopping fast " button on interface, it is serious that middle control operating personnel find that system ammonia leaks, system does not start sound and light alarm and accident spray, click " stopping fast " button, all devices stops, valve closing, does not start cleaning procedure.
Soft water water source and rinse-system: according to the utility model security technique, for denitrating system has configured soft water water source pump, soft water storage tank and soft water conveyor module, when system stops, after halt system, automatically start program again.
On the touch screen on the spot of click denitration switch board and DCS operating platform " halt system ", equipment valve stops in order, and starts cleaning procedure, and reducing agent distributes pneumatic operated valve on cabinet house steward and each branch road to open, the startup of soft water conveyor module sequence (open by soft water delivery pump, soft water delivery pump outlet valve is opened), time delay 40s, along stopping, (soft water delivery pump closes soft water conveyor module, soft water delivery pump outlet pneumatic operated valve cuts out), reducing agent distributes cabinet main valve to close, each branch road valve orderly close-down, and system stops.
Claims (10)
1. improve a cement furnace SNCR flue gas denitrification system for denitration security, comprise dore furnace, reducing agent distribution module, connect reducing agent distribution module and dore furnace spray gun, denitration control module, pass through reducing agent distribution module soft water conveyor module and ammoniacal liquor feed system in parallel; Described ammoniacal liquor feed system comprises the ammoniacal liquor tank car, ammoniacal liquor Unload module, tank used for storing ammonia and the ammoniacal liquor conveyor module that connect successively, and described ammoniacal liquor conveyor module is connected with reducing agent distribution module; It is characterized in that,
Described ammoniacal liquor Unload module top is provided with the first spray equipment, described tank used for storing ammonia top is provided with temperature sensor, pressure sensor and the unrestrained valve of safety, described tank used for storing ammonia top is provided with the second spray equipment, described ammoniacal liquor conveyor module place is provided with the first ammonia leakage detector and first sound light crossing-signal, and described ammoniacal liquor conveyor module top is provided with the 4th spray equipment;
Described reducing agent distribution module place is provided with the second ammonia leakage detector, rising tone light crossing-signal and exhaust fan;
Described temperature sensor, pressure sensor, the first ammonia leakage detector and the second ammonia leakage detector all communicate to connect to denitration control module;
The switch of described the second spray equipment, the 4th spray equipment, first sound light crossing-signal, rising tone light crossing-signal and exhaust fan is all connected and is controlled by denitration control module.
2. the cement furnace SNCR flue gas denitrification system that improves according to claim 1 denitration security, is characterized in that, described denitration control module is DCS controller.
3. the cement furnace SNCR flue gas denitrification system that improves according to claim 1 denitration security, is characterized in that, is also provided with the 3rd spray equipment for emergency processing near described tank used for storing ammonia, and the 3rd spray equipment connects tank from the beginning.
4. the cement furnace SNCR flue gas denitrification system that improves according to claim 1 denitration security, is characterized in that, described ammoniacal liquor Unload module, ammoniacal liquor conveyor module, reducing agent distribution module and soft water conveyor module place are equipped with scram button.
5. the cement furnace SNCR flue gas denitrification system that improves according to claim 1 denitration security, is characterized in that, described the second spray equipment and the 4th spray equipment are all with magnetic valve, and described magnetic valve connects and be controlled by denitration control module.
6. improve according to claim 5 the cement furnace SNCR flue gas denitrification system of denitration security, it is characterized in that, the front and back of described magnetic valve are also provided with manual ball valve, on inlet channel between shower nozzle and the corresponding magnetic valve of described the second spray equipment and the 4th spray equipment, be connected with bypass duct, this bypass duct is provided with bypass ball valve.
7. improve according to claim 1 the cement furnace SNCR flue gas denitrification system of denitration security, it is characterized in that, described tank used for storing ammonia below is provided with accident pool, and described accident pool comprises the cover plate at top at the bottom of the pond body that locates below ground level and pond, and described tank used for storing ammonia is installed on described cover plate.
8. the cement furnace SNCR flue gas denitrification system that improves according to claim 7 denitration security, is characterized in that, described cover plate top is provided with the cofferdam of arranging around described tank used for storing ammonia, and bottom, described cofferdam is provided with manhole, and manhole place correspondence is provided with manhole door.
9. improve according to claim 8 the cement furnace SNCR flue gas denitrification system of denitration security, it is characterized in that, described the first spray equipment, the 3rd spray equipment and the 4th spray equipment below are equipped with shower water gathering-device, and this shower water gathering-device is by extremely described accident pool of pipeline communication.
10. the cement furnace SNCR flue gas denitrification system that improves according to claim 9 denitration security, is characterized in that, the pond body bulk of described accident pool is not less than the dischargeable capacity of tank used for storing ammonia, is provided with some for supporting the pillar of cover plate in the body of described pond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320800162.4U CN203663694U (en) | 2013-12-06 | 2013-12-06 | Cement kiln SNCR flue gas denitration system for improving denitration security |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320800162.4U CN203663694U (en) | 2013-12-06 | 2013-12-06 | Cement kiln SNCR flue gas denitration system for improving denitration security |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203663694U true CN203663694U (en) | 2014-06-25 |
Family
ID=50960029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320800162.4U Expired - Fee Related CN203663694U (en) | 2013-12-06 | 2013-12-06 | Cement kiln SNCR flue gas denitration system for improving denitration security |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203663694U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691290A (en) * | 2013-12-06 | 2014-04-02 | 浙江省环境保护科学设计研究院 | Cement kiln SNCR (Selective Non Catalytic Reduction) flue gas denitrification system capable of improving denitrification safety |
| CN106492630A (en) * | 2017-01-05 | 2017-03-15 | 浙江友通环境科技有限公司 | A kind of SCR flue gas denitrification systems |
-
2013
- 2013-12-06 CN CN201320800162.4U patent/CN203663694U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691290A (en) * | 2013-12-06 | 2014-04-02 | 浙江省环境保护科学设计研究院 | Cement kiln SNCR (Selective Non Catalytic Reduction) flue gas denitrification system capable of improving denitrification safety |
| CN103691290B (en) * | 2013-12-06 | 2015-08-05 | 浙江省环境保护科学设计研究院 | A kind of cement furnace SNCR flue gas denitrification system improving denitration security |
| CN106492630A (en) * | 2017-01-05 | 2017-03-15 | 浙江友通环境科技有限公司 | A kind of SCR flue gas denitrification systems |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103691290B (en) | A kind of cement furnace SNCR flue gas denitrification system improving denitration security | |
| CN104964159B (en) | The method of replacing of ammonia in a kind of liquid ammonia storage tank | |
| CN206935094U (en) | A kind of SNCR equipment for denitrifying flue gas | |
| CN203663694U (en) | Cement kiln SNCR flue gas denitration system for improving denitration security | |
| CN204656318U (en) | A kind of boiler flue gas denitration system | |
| CN206414660U (en) | A kind of standby cabinet type perfluorethyl isopropyl ketone extinguishing device of pressure | |
| CN111850326A (en) | Nitrogen-chlorine gas mixing system and method for aluminum melt purification | |
| CN203816485U (en) | Chemical adding device | |
| CN102540948A (en) | Method for realizing remote monitoring of synthesis ammonia storage tank and automatic spraying | |
| CN109364697A (en) | The system of the processing of methanol production VOCs | |
| CN212758047U (en) | Flue gas denitration system of air gas preheating steel rolling heating furnace | |
| CN102352960B (en) | Safety device for preventing leakage during storage of nitric acid | |
| CN109163216B (en) | Safe intelligent liquid ammonia vaporization system | |
| CN208907964U (en) | A kind of water route harmful influence transport leakage pollution Failure Simulation device | |
| CN203663695U (en) | Reducing agent metering and distributing device for SNCR (selective non-catalytic reduction) denitration of cement kiln | |
| CN113101783A (en) | System for separating ammonia production gas produced by urea hydrolysis for chemical ammonia adding system | |
| CN208574471U (en) | A kind of marsh gas treatment device for digester overflow ditch | |
| CN111322627A (en) | Device and method for cleaning and treating tail gas of coking production process | |
| CN206901064U (en) | A kind of hazardous chemical storage tank processing unit | |
| CN219848932U (en) | Emergency treatment system for indoor sulfur dioxide gas leakage | |
| CN201625493U (en) | Device for recycling waste tire discomposed oil gas | |
| CN205151788U (en) | High -efficient safe waste heat system ammonia device | |
| CN211487137U (en) | Be applied to sled dress device of SNCR denitration | |
| CN108219858A (en) | A kind of doctor solution medicine system and method for fine purification technique for coke oven gas | |
| CN216243599U (en) | Ammonia dosing system under weak negative pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20171206 |