CN107890779A - A kind of new denitration system of power plant - Google Patents

A kind of new denitration system of power plant Download PDF

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Publication number
CN107890779A
CN107890779A CN201711408701.9A CN201711408701A CN107890779A CN 107890779 A CN107890779 A CN 107890779A CN 201711408701 A CN201711408701 A CN 201711408701A CN 107890779 A CN107890779 A CN 107890779A
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CN
China
Prior art keywords
power plant
ammonia
delivery pipe
mixing duct
catalytic reactor
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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.)
Withdrawn
Application number
CN201711408701.9A
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Chinese (zh)
Inventor
王啸阳
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Huaan Suzhou General Amperex Technology Ltd
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Huaan Suzhou General Amperex Technology Ltd
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Priority to CN201711408701.9A priority Critical patent/CN107890779A/en
Publication of CN107890779A publication Critical patent/CN107890779A/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The present invention relates to a kind of new denitration system of power plant, including urea storage tank, multi-fluid injection apparatus, mixing duct, catalytic reactor and with the escaping of ammonia control room.Multi-fluid injection apparatus connects with urea storage tank and compressed air source respectively.One end connection smoke discharging pipe and multi-fluid injection apparatus of mixing duct, the other end connects the import of catalytic reactor, the outlet of catalytic reactor is connected by the second delivery pipe with the escaping of ammonia control room, second delivery pipe is provided with ammonia density detector, tie point is drawn in second delivery pipe, one end of the tie point is connected by triple valve with the second delivery pipe, and its other end is connected with mixing duct.Also include control system, smoke discharging pipe is provided with temperature sensor, flow sensor and NOx concentration detector, control system respectively with temperature sensor, flow sensor, NOx concentration detector, peristaltic pump, ammonia density detector and triple valve connection communication.The present invention is simple in construction, denitration efficiency is high.

Description

A kind of new denitration system of power plant
Technical field
The present invention relates to power plant's denitration technology field, more particularly to a kind of new denitration system of power plant.
Background technology
Contain substantial amounts of nitrogen oxides in the high-temperature flue gas of power plant discharge, nature ring is given in the discharge of this part nitrogen oxides Border and human lives bring serious harm.As nitrogen oxides can make human body hemochrome nitrify, cause respiratory inflammation.Nitrogen oxygen Compound is one of the main reason for forming acid rain, acid mist, and nitrogen oxides has also assisted in the destruction of ozone layer, therefore, nitrogen oxides Have become the big public hazards of one be set to now, influenceed to control and reduce it to caused by atmospheric environment, national and local ring Discharge of the department to nitrogen oxides in industrial production waste gas is protected to have clear and definite, enforceable discharge standard in border.At present, both at home and abroad The removing process of a variety of nitrogen oxides, the selective noncatalytic reduction of main denitrating technique (SNCR) and choosing are developed Selecting property catalytic reduction method (SCR).Comparatively speaking, for its denitration efficiency of existing denitration device all than relatively low, generally 50% is left The right side, initial outlay is big, therefore, is badly in need of a kind of equipment that can mention denitration efficiency.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of new power plant's denitration system simple in construction, denitration efficiency is high System.
In order to solve the above-mentioned technical problem, the invention provides a kind of new denitration system of power plant, including it is urea storage tank, more Fluid ejection apparatus, mixing duct, catalytic reactor and the escaping of ammonia control room, the multi-fluid injection apparatus are provided with urea solution Import and compressed air inlet, the urea solution import are connected by the first delivery pipe with the urea storage tank, and described first is defeated Pipe is sent to be provided with peristaltic pump, the compressed air inlet connects with a compressed air source, for the multi-fluid injection apparatus Interior feeding compressed air；The mixing duct is provided with high-temperature flue gas import, reducing agent import and fluid-mixing outlet, described The smoke discharging pipe of high-temperature flue gas import and power plant connects, the reducing agent import and the jet exit of the multi-fluid injection apparatus Connection, the fluid-mixing outlet is connected with the import of the catalytic reactor, and the outlet of the catalytic reactor passes through the Two delivery pipes are connected with the escaping of ammonia control room, and the escaping of ammonia control room is used to handle unreacted in the catalytic reactor NH3, second delivery pipe is being provided with ammonia density detector in the exit close to the catalytic reactor, and described second conveys Tie point is drawn on pipe, one end of the tie point is connected by triple valve with second delivery pipe, its other end with The mixing duct connection；Also include control system, the smoke discharging pipe is being provided with temperature at the high-temperature flue gas import Sensor, flow sensor and NOx concentration detector, the control system respectively with the temperature sensor, flow sensor, NOx concentration detector, peristaltic pump connection communication, ammonia density detector and triple valve connection communication.
Further, connected between the peristaltic pump and the urea storage tank and be provided with first filter and the second filter.
Further, the pipeline that the compressed air inlet connects with compressed air source is provided with regulator, the tune Pressure device and the control system connection communication.
Further, the mixing duct interior edge fluid flow direction interval is provided with deflection plate.
Further, what is be spaced in the mixing duct is provided with 3 deflection plates, wherein, there are two deflection plates to set In mixing duct inside upper part, there is a deflection plate to be arranged on mixing duct lower inside.
Further, the pressure of the compressed air is 2~3MPa.
Further, expansion joint is provided between the mixing duct and the catalytic reactor.
Further, it is provided with the escaping of ammonia control room and enters for aoxidizing in the escaping of ammonia control indoor gas NH3Beds.
A kind of new denitration system of power plant of the present invention, has the advantages that：
(1) new denitration system of power plant of the invention, exist as the urea solution of reducing agent and high-temperature flue gas first first It is sufficiently mixed to be re-fed into catalytic reactor in mixing duct and carries out SCR, because reducing agent and high-temperature flue gas fills Divide mixing, so that the nitrogen oxides in high-temperature flue gas can be contacted more fully with reducing agent, be advantageous to improve nitrogen oxygen The transformation efficiency of compound.
(2) device is provided with temperature sensor, flow sensor and NOx concentration detector at high-temperature flue gas import, and Temperature sensor, flow sensor, NOx concentration detector and the peristaltic pump that is arranged on urea solution conveyance conduit are with control System connection communication, so as to control the emitted dose of urea well so that the emitted dose of urea is discharged with high-temperature flue gas Change and change, by the lasting monitoring to NOx concentration, control system can continue to adjust the emitted dose of urea solution, allow more NOx is reduced, and improves the conversion ratio of nitrogen oxides in effluent.
(3) present invention is provided with the escaping of ammonia control room after catalytic reactor, by the escaping of ammonia control room by catalytic reactor In unreacted NH3It is oxidized to N2And H2O, so as to ensure to discharge the content of ammonia in gas gas, it is effectively prevented emptying and makes Into secondary pollution.
(4) present invention draws tie point in the second delivery pipe of connection catalytic reactor and the escaping of ammonia control room, should One end of tie point is connected by triple valve with the second delivery pipe, its other end connection mixing duct, the second delivery pipe by The exit of nearly catalytic reactor is provided with ammonia density detector, and the ammonia density detector and triple valve are connected with control system Communication, when ammonia density detector detects the ammonia density of gas in the second delivery pipe higher than limitation, control system control threeway Valve connects the second delivery pipe and tie point so that the gas in the second delivery pipe enters in mixing duct, fully recycles The NH of unreacted high concentration3, energy consumption is advantageously reduced, it is cost-effective；And when the ammonia concentration of ammonia density detector detection When within the acceptable range, control system control triple valve connection catalytic reactor and the escaping of ammonia control room, pass through the escaping of ammonia Control room disposes the NH of small concentration in tail gas3, to reach qualified discharge.
Brief description of the drawings
Fig. 1 is a kind of structural representation of new denitration system of power plant provided by the invention；
Label declaration in figure：1- urea storage tanks, 2- multi-fluid injection apparatus, 3- mixing ducts, 4- catalytic reactors, 5- One delivery pipe, 6- peristaltic pumps, 7- smoke discharging pipes, 8- control systems, 9- expansion joints, 10- the escaping of ammonia control rooms, 11- first are filtered Device, the filters of 12- second, 21- urea solution imports, 22- compressed air inlets, 31- high-temperature flue gas imports, 32- reducing agent imports, 33- fluid-mixing outlets, 101- temperature sensors, 102- flow sensors, 103-NOx concentration detectors, 104- ammonia densities Detector, the delivery pipes of 105- second, 106- tie points, 107- triple valves, 221- regulators.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, so that those skilled in the art can be with More fully understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
A kind of one embodiment of new denitration system of power plant of the present invention, the new denitration system of power plant include urea storage tank 1st, multi-fluid injection apparatus 2, mixing duct 3, catalytic reactor 4 and the escaping of ammonia control room 10.Urea storage tank 1 is used to store conduct The urea solution that reducing agent uses, multi-fluid injection apparatus 2 are used to spray urea solution and compressed air, and mixing duct 3 is used to cause Urea solution and compressed air fluid after injection are sufficiently mixed uniformly with high-temperature flue gas, and catalytic reactor 4 is used to reduce high temperature cigarette Nitrogen oxides in gas, so as to obtain the tail gas of abundant denitration, the escaping of ammonia control room 10 be used for processing enter catalytic reactor 4 and The NH not reacted3, and then prevent secondary pollution caused by emptying.
Specifically, the multi-fluid injection apparatus 2 is provided with urea solution import 21 and compressed air inlet 22, the urea Liquid import 21 is connected by the first delivery pipe 5 with the urea storage tank 1, and first delivery pipe 5 is provided with peristaltic pump 6, and this is compacted Urea solution can not only be carried out pressurized delivered by dynamic pump 6, additionally it is possible to measure the amount of the urea solution of conveying.The compressed air inlet 22 connect with a compressed air source, for being sent into compressed air into the multi-fluid injection apparatus 2.
The mixing duct 3 is provided with high-temperature flue gas import 31, reducing agent import 32 and fluid-mixing outlet 33, described High-temperature flue gas import 31 is connected with the smoke discharging pipe 7 of power plant, and the high-temperature flue gas in smoke discharging pipe 7 passes through the high-temperature flue gas import 31 Into in mixing duct 3.
The reducing agent import 32 is connected with the jet exit of the multi-fluid injection apparatus 2, the fluid-mixing discharge Mouth 33 is connected with the import of the catalytic reactor 4, and the high-temperature flue gas and the urea solution mixing in the mixing duct 3 are laggard Enter in the catalytic reactor 4 and react, the nitrogen oxides in catalytic reactor 4 in high-temperature flue gas is reduced, so as to be filled Divide the tail gas of denitration.
In order to prevent secondary pollution caused by unreacted ammonia is directly discharged to environment in catalytic reactor 4, it is being catalyzed The outlet of reactor 4 connects a escaping of ammonia control room 10 by the second delivery pipe 105, by the escaping of ammonia control room 10 by tail gas In fail reaction ammonia further remove.Preferably, it is provided with the escaping of ammonia control room 10 and enters institute for aoxidizing State in the escaping of ammonia control room 10 NH in gas3Beds.
The denitrating system includes control system 8, and the smoke discharging pipe 7 is being provided with temperature at the high-temperature flue gas import 31 Spend sensor 101, flow sensor 102 and NOx concentration detector 103, the control system 8 respectively with the temperature sensor 101st, flow sensor 102, NOx concentration detector 103 and the connection communication of peristaltic pump 6.
In actual motion, detection enters in real time for temperature sensor 101, flow sensor 102 and NOx concentration detector 103 Temperature, flow and the NOx concentration of high-temperature flue gas in mixing duct 3, and coherent signal is conveyed to control system 8, control system System 8 is by the analysis output control signal of the temperature of the high-temperature flue gas to reception, flow and NOx concentration to peristaltic pump 6, peristaltic pump 6 receive the control signal from control system 8, and adjust the flow of the urea solution of conveying, so as to control urea well Emitted dose, not only allow more nitrogen oxides to reduce, moreover it is possible to save raw material, reduce energy consumption.
In order to make full use of the ammonia of unreacted high concentration, the second delivery pipe 105 is close to the outlet of catalytic reactor 4 Place is provided with ammonia density detector 104, draws tie point 106 in the second delivery pipe 105, one end of the tie point 106 passes through One triple valve 107 is connected with the second delivery pipe 105, and the other end is connected with mixing duct 3, and ammonia density detector 104 and threeway Valve 107 with the connection communication of control system 8.
In actual motion, when ammonia density detector 104 detects NH3 concentration in the gas discharged from catalytic reactor 4 During higher than limit value, control system 8 is sent the signal to, control system 8 controls the connection second of triple valve 107 defeated according to the signal Pipe 105 and tie point 106 are sent, and disconnects the connection of catalytic reactor 4 and the escaping of ammonia control room 10, so as to which height will be contained The tail gas of concentration ammonia, which is fed again into be sent into catalytic reactor 4 after mixing in mixing duct 3, to be reacted.When ammonia density detects When instrument 104 detects that NH3 concentration is in normal in the gas discharged from catalytic reactor 4, control system 8 controls catalytic reaction Device 4 is connected with the escaping of ammonia control room 10, and the ammonia of low concentration is oxidized into nitrogen so as to which tail gas enters in the escaping of ammonia control room 10 Discharged with after water.
In one preferred embodiment, in order to which the impurity timely processing in the urea solution by conveying is fallen, the wriggling Connected between pump 6 and the urea storage tank 1 and be provided with the filter 12 of first filter 11 and second.
In one preferred embodiment, the pipeline that the compressed air inlet 22 connects with compressed air source is provided with Regulator 221, the regulator 221 and the connection communication of control system 8.Compressed air is controlled by control system 8 Pressure, so as to control the uniformity of the jet velocity of urea solution and injection well, be advantageous to improve nitrogen oxides Conversion efficiency.Preferably, the pressure of compressed air is 2~3MPa.
In one preferred embodiment, in order that must spray fluid can fill with high-temperature flue gas in mixing duct 3 The mixing divided, to ensure high denitration efficiency, the interior edge fluid flow direction interval of mixing duct 3 is provided with deflection plate.Should Deflection plate setting cause mixing duct 3 in fluid occur various dimensions disturbance, mixing it is more abundant.Preferably, it is described What is be spaced in mixing duct 3 is provided with 3 deflection plates, wherein, there are two deflection plates to be arranged on mixing duct inside upper part, have One deflection plate is arranged on mixing duct lower inside, in this way, fluid is flowed in mixing duct 3 with S types path.
In one preferred embodiment, in order to prevent the fracture of junction between mixing duct 3 and catalytic reactor 4, Expansion joint 9 is provided between the mixing duct 3 and the catalytic reactor 4.
A kind of new denitration system of power plant of the present invention, has the advantages that：
(1) new denitration system of power plant of the invention, exist as the urea solution of reducing agent and high-temperature flue gas first first It is sufficiently mixed to be re-fed into catalytic reactor in mixing duct and carries out SCR, because reducing agent and high-temperature flue gas fills Divide mixing, so that the nitrogen oxides in high-temperature flue gas can be contacted more fully with reducing agent, be advantageous to improve nitrogen oxygen The transformation efficiency of compound.
(2) device is provided with temperature sensor, flow sensor and NOx concentration detector at high-temperature flue gas import, and Temperature sensor, flow sensor, NOx concentration detector and the peristaltic pump that is arranged on urea solution conveyance conduit are with control System connection communication, so as to control the emitted dose of urea well so that the emitted dose of urea is discharged with high-temperature flue gas Change and change, by the lasting monitoring to NOx concentration, control system can continue to adjust the emitted dose of urea solution, allow more NOx is reduced, and improves the conversion ratio of nitrogen oxides in effluent.
(3) present invention is provided with the escaping of ammonia control room after catalytic reactor, by the escaping of ammonia control room by catalytic reactor In unreacted NH3It is oxidized to N2And H2O, so as to ensure to discharge the content of ammonia in gas gas, it is effectively prevented emptying and makes Into secondary pollution.
(4) present invention draws tie point in the second delivery pipe of connection catalytic reactor and the escaping of ammonia control room, should One end of tie point is connected by triple valve with the second delivery pipe, its other end connection mixing duct, the second delivery pipe by The exit of nearly catalytic reactor is provided with ammonia density detector, and the ammonia density detector and triple valve are connected with control system Communication, when ammonia density detector detects the ammonia density of gas in the second delivery pipe higher than limitation, control system control threeway Valve connects the second delivery pipe and tie point so that the gas in the second delivery pipe enters in mixing duct, fully recycles The NH of unreacted high concentration3, energy consumption is advantageously reduced, it is cost-effective；And when the ammonia concentration of ammonia density detector detection When within the acceptable range, control system control triple valve connection catalytic reactor and the escaping of ammonia control room, pass through the escaping of ammonia Control room disposes the NH of small concentration in tail gas3, to reach qualified discharge.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention Enclose not limited to this.The equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the present invention Protection domain within.Protection scope of the present invention is defined by claims.

Claims (8)

1. a kind of new denitration system of power plant, it is characterised in that including urea storage tank (1), multi-fluid injection apparatus (2), mixing Pipeline (3), catalytic reactor (4) and the escaping of ammonia control room (10), the multi-fluid injection apparatus (2) are provided with urea solution import (21) connected with compressed air inlet (22), the urea solution import (21) by the first delivery pipe (5) and the urea storage tank (1) Logical, first delivery pipe (5) is provided with peristaltic pump (6), and the compressed air inlet (22) connects with a compressed air source；Institute State mixing duct (3) and be provided with high-temperature flue gas import (31), reducing agent import (32) and fluid-mixing outlet (33), the height Warm gas approach (31) is connected with the smoke discharging pipe (7) of power plant, the reducing agent import (32) and the multi-fluid injection apparatus (2) jet exit connection, the fluid-mixing outlet (33) are connected with the import of the catalytic reactor (4)；It is described to urge The outlet for changing reactor (4) is connected by the second delivery pipe (105) with the escaping of ammonia control room (10), second delivery pipe (105) ammonia density detector (104), second delivery pipe (105) are provided with the exit close to the catalytic reactor (4) Upper extraction tie point (106), one end of the tie point (106) passes through triple valve (107) and second delivery pipe (105) connect, its other end is connected with the mixing duct (3)；Also include control system (8), the smoke discharging pipe (7) by Nearly high-temperature flue gas import (31) place is provided with temperature sensor (101), flow sensor (102) and NOx concentration detector (103), the control system (8) respectively with the temperature sensor (101), flow sensor (102), NOx concentration detector (103), peristaltic pump (6), ammonia density detector (104) and triple valve (107) connection communication.
2. a kind of new denitration system of power plant as claimed in claim 1, it is characterised in that the peristaltic pump (6) and the urine Series connection is provided with first filter (11) and the second filter (12) between plain storage tank (1).
A kind of 3. new denitration system of power plant as claimed in claim 1, it is characterised in that the compressed air inlet (22) with The pipeline of compressed air source connection is provided with regulator (221), and the regulator (221) connects with the control system (8) Connect letter.
A kind of 4. new denitration system of power plant as claimed in claim 1, it is characterised in that mixing duct (3) the interior edge stream Body flow direction interval is provided with deflection plate.
5. a kind of new denitration system of power plant as claimed in claim 4, it is characterised in that be spaced in the mixing duct (3) Be provided with 3 deflection plates, wherein, there are two deflection plates to be arranged on mixing duct inside upper part, there is a deflection plate It is arranged on mixing duct lower inside.
6. a kind of new denitration system of power plant as claimed in claim 1, it is characterised in that the pressure of the compressed air is 2 ~3MPa.
A kind of 7. new denitration system of power plant as claimed in claim 1, it is characterised in that the mixing duct (3) with it is described Expansion joint (9) is provided between catalytic reactor (4).
8. a kind of new denitration system of power plant as claimed in claim 1, it is characterised in that in the escaping of ammonia control room (10) It is provided with and enters NH in the interior gas of the escaping of ammonia control room (10) for aoxidizing3Beds.
CN201711408701.9A 2017-12-22 2017-12-22 A kind of new denitration system of power plant Withdrawn CN107890779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711408701.9A CN107890779A (en) 2017-12-22 2017-12-22 A kind of new denitration system of power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711408701.9A CN107890779A (en) 2017-12-22 2017-12-22 A kind of new denitration system of power plant

Publications (1)

Publication Number Publication Date
CN107890779A true CN107890779A (en) 2018-04-10

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Application Number Title Priority Date Filing Date
CN201711408701.9A Withdrawn CN107890779A (en) 2017-12-22 2017-12-22 A kind of new denitration system of power plant

Country Status (1)

Country Link
CN (1) CN107890779A (en)

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Application publication date: 20180410

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