CN107930397A - A kind of denitration device of power plant - Google Patents

A kind of denitration device of power plant Download PDF

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Publication number
CN107930397A
CN107930397A CN201711408703.8A CN201711408703A CN107930397A CN 107930397 A CN107930397 A CN 107930397A CN 201711408703 A CN201711408703 A CN 201711408703A CN 107930397 A CN107930397 A CN 107930397A
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CN
China
Prior art keywords
power plant
compressed air
mixing duct
flue gas
denitration device
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.)
Withdrawn
Application number
CN201711408703.8A
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Chinese (zh)
Inventor
王啸阳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huaan Suzhou General Amperex Technology Ltd
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Huaan Suzhou General Amperex Technology Ltd
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Filing date
Publication date
Application filed by Huaan Suzhou General Amperex Technology Ltd filed Critical Huaan Suzhou General Amperex Technology Ltd
Priority to CN201711408703.8A priority Critical patent/CN107930397A/en
Publication of CN107930397A publication Critical patent/CN107930397A/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Withdrawn legal-status Critical Current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
    • B01D53/8696—Controlling the catalytic process
    • 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
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • 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 invention discloses a kind of denitration device of power plant, including urea storage tank, two-fluid injection apparatus, mixing duct and catalytic reactor.Two-fluid injection apparatus is equipped with urea solution import and compressed air inlet, and urea solution import is connected by the first delivery pipe with urea storage tank, and the first delivery pipe is equipped with peristaltic pump, and compressed air inlet is connected with a compressed air source.Mixing duct is equipped with the high-temperature flue gas import being connected with the smoke discharging pipe of power plant, the reducing agent import being connected with the jet exit of two-fluid injection apparatus and the fluid-mixing outlet being connected with catalytic reactor；Further include control system, smoke discharging pipe is being equipped with temperature sensor, flow sensor and NOx concentration detector at high-temperature flue gas import, control system respectively with temperature sensor, flow sensor, NOx concentration detector and peristaltic pump connection communication.The configuration of the present invention is simple, denitration efficiency are high.

Description

A kind of denitration device of power plant
Technical field
The present invention relates to power plant's denitration technology field, more particularly to a kind of denitration device 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, influenced to control and reduce it caused by atmospheric environment, country 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 denitration device of power plant simple in structure, denitration efficiency is high.
In order to solve the above technical problem, the present invention provides a kind of denitration device of power plant, including urea storage tank, two-fluid Injection apparatus, mixing duct and catalytic reactor, the two-fluid injection apparatus be equipped with urea solution import and compressed air into Mouthful, the urea solution import is connected by the first delivery pipe with the urea storage tank, and first delivery pipe is equipped with peristaltic pump, The compressed air inlet is connected with a compressed air source, for being sent into compressed air into the two-fluid injection apparatus；Institute State mixing duct and be equipped with high-temperature flue gas import, reducing agent import and fluid-mixing outlet, the high-temperature flue gas import and electricity The smoke discharging pipe connection of factory, the reducing agent import are connected with the jet exit of the two-fluid injection apparatus, the mixed flow Body outlet is connected with the catalytic reactor, and the high-temperature flue gas and reducing agent enter institute after being mixed in the mixing duct State reaction in catalytic reactor；Control system is further included, the smoke discharging pipe is being equipped with temperature at the high-temperature flue gas import Spend sensor, flow sensor and NOx concentration detector, the control system respectively with the temperature sensor, flow sensing Device, NOx concentration detector and peristaltic pump connection communication.
Further, connect between the peristaltic pump and the urea storage tank and be equipped with first filter and the second filter.
Further, the pipeline that the compressed air inlet is connected with compressed air source is equipped with regulator, the tune Pressure device and the control system connection communication.
Further, in the mixing duct baffle plate is equipped with along fluid flow direction interval.
Further, what is be spaced in the mixing duct is equipped with 3 baffle plates, wherein, there are two baffle plates to set In mixing duct inside upper part, there is a baffle plate to be arranged on mixing duct lower inside.
Further, the pressure of the compressed air is 2~3MPa.
Further, expansion joint is equipped between the mixing duct and the catalytic reactor.
Further, it is additionally provided with deduster on the smoke discharging pipe.
A kind of denitration device of power plant of the present invention, has the advantages that：
The denitration device of power plant of the present invention, first using as the urea solution of reducing agent and high-temperature flue gas first in mixing duct Inside it is sufficiently mixed and is re-fed into making choice property catalysis reduction in catalytic reactor, since reducing agent and high-temperature flue gas are sufficiently mixed, So that the nitrogen oxides in high-temperature flue gas can be contacted more fully with reducing agent, be conducive to improve turning for nitrogen oxides Change efficiency.
In addition, the device is equipped 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 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 reduction, improve the conversion ratio of nitrogen oxides in effluent.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of denitration device of power plant provided by the invention；
Figure label explanation：1- urea storage tanks, 2- two-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- dedusters, 11- first filters, 12- Second filter, 21- urea solution imports, 22- compressed air inlets, 31- high-temperature flue gas imports, 32- reducing agent imports, 33- are mixed Close fluid discharge outlet, 101- temperature sensors, 102- flow sensors, 103-NOx concentration detectors, 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 denitration device of power plant of the present invention, the denitration device of power plant include urea storage tank 1, two-fluid Injection apparatus 2, mixing duct 3 and catalytic reactor 4.Urea storage tank 1 is used to store the urea solution used as reducing agent, double fluid Body injection apparatus 2 is used to spray urea solution and compressed air, and mixing duct 3 is used for urea solution and compressed air so that after injection Fluid is sufficiently mixed uniformly with high-temperature flue gas, and catalytic reactor 4 is used to reduce the nitrogen oxides in high-temperature flue gas, so as to be done Net exhaust emissions.
Specifically, the two-fluid injection apparatus 2 is equipped 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 equipped with peristaltic pump 6, 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 two-fluid injection apparatus 2.
The mixing duct 3 is equipped 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 two-fluid injection apparatus 2, the fluid-mixing discharge Mouth 33 is connected with the catalytic reactor 4, and the high-temperature flue gas and urea solution enter described in the mixing duct 3 after mixing Reaction in catalytic reactor 4, the nitrogen oxides in catalytic reactor 4 in high-temperature flue gas is reduced, so as to obtain clean tail Gas.
The denitrification apparatus includes control system 8, and the smoke discharging pipe 7 is being equipped 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, 6 connection communication of flow sensor 102, NOx concentration detector 103 and peristaltic pump.
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 one preferred embodiment, in order to which the impurity timely processing in the urea solution by conveying is fallen, the wriggling Pump 6 is equipped with 11 and second filter 12 of first filter with connecting between the urea storage tank 1.
In one preferred embodiment, the pipeline that the compressed air inlet 22 is connected with compressed air source is equipped with Regulator 221, the regulator 221 and 8 connection communication of control system.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 conducive to improve nitrogen oxides Transfer efficiency.Preferably, the pressure of compressed air is 2~3MPa.
In one preferred embodiment, in order to enable injection fluid can be filled with high-temperature flue gas in mixing duct 3 The mixing divided, to ensure high denitration efficiency, the mixing duct 3 is interior to be equipped with baffle plate along fluid flow direction interval.Should Baffle plate setting so that 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 equipped with 3 baffle plates, wherein, there are two baffle plates to be arranged on mixing duct inside upper part, have One baffle 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 between mixing duct 3 and catalytic reactor 4 junction fracture, Expansion joint 9 is equipped between the mixing duct 3 and the catalytic reactor 4.
In one preferred embodiment, the particulate matter in order to prevent in high-temperature flue gas is covered in catalytic reactor 4 On interior catalyst, the catalytic performance of catalyst is reduced, the smoke discharging pipe 7 is equipped with deduster 10, to remove in high-temperature flue gas Most of dust.
A kind of denitration device of power plant of the present invention, has the advantages that：
The denitration device of power plant of the present invention, first using as the urea solution of reducing agent and high-temperature flue gas first in mixing duct Inside it is sufficiently mixed and is re-fed into making choice property catalysis reduction in catalytic reactor, since reducing agent and high-temperature flue gas are sufficiently mixed, So that the nitrogen oxides in high-temperature flue gas can be contacted more fully with reducing agent, be conducive to improve turning for nitrogen oxides Change efficiency.
In addition, the device is equipped 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 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 reduction, improve the conversion ratio of nitrogen oxides in effluent.
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 subject to claims.

Claims (8)

1. a kind of denitration device of power plant, it is characterised in that including urea storage tank (1), two-fluid injection apparatus (2), mixing duct (3) and catalytic reactor (4), the two-fluid injection apparatus (2) are equipped with urea solution import (21) and compressed air inlet (22), the urea solution import (21) is connected by the first delivery pipe (5) with the urea storage tank (1), first delivery pipe (5) peristaltic pump (6) is equipped with, the compressed air inlet (22) connects with a compressed air source, for being sprayed to the two-fluid Compressed air is sent into injection device (2)；The mixing duct (3) is equipped with high-temperature flue gas import (31), reducing agent import (32) With fluid-mixing outlet (33), the high-temperature flue gas import (31) is connected with the smoke discharging pipe (7) of power plant, the reducing agent into Mouth (32) is connected with the jet exit of the two-fluid injection apparatus (2), the fluid-mixing outlet (33) and the catalysis Reactor (4) connects, and the high-temperature flue gas and urea solution enter the catalytic reactor in the mixing duct (3) after mixing (4) reaction in；Control system (8) is further included, the smoke discharging pipe (7) is being equipped with temperature close to the high-temperature flue gas import (31) place Spend sensor (101), flow sensor (102) and NOx concentration detector (103), the control system (8) respectively with the temperature Spend sensor (101), flow sensor (102), NOx concentration detector (103) and peristaltic pump (6) connection communication.
2. a kind of denitration device of power plant as claimed in claim 1, it is characterised in that the peristaltic pump (6) is stored up with the urea Series connection is equipped with first filter (11) and the second filter (12) between tank (1).
3. a kind of denitration device of power plant as claimed in claim 1, it is characterised in that the compressed air inlet (22) and compression The pipeline of air-source connection is equipped with regulator (221), and the regulator (221) is connected logical with the control system (8) Letter.
4. a kind of denitration device of power plant as claimed in claim 1, it is characterised in that along fluid stream in the mixing duct (3) Dynamic direction interval is equipped with baffle plate.
5. a kind of denitration device of power plant as claimed in claim 4, it is characterised in that interval sets in the mixing duct (3) There are 3 baffle plates, wherein, there are two baffle plates to be arranged on mixing duct inside upper part, there is a baffle plate to set In mixing duct lower inside.
A kind of 6. denitration device of power plant as claimed in claim 1, it is characterised in that the pressure of the compressed air for 2~ 3MPa。
7. a kind of denitration device of power plant as claimed in claim 1, it is characterised in that the mixing duct (3) and the catalysis Expansion joint (9) is equipped between reactor (4).
8. a kind of denitration device of power plant as claimed in claim 1, it is characterised in that be additionally provided with and remove on the smoke discharging pipe (7) Dirt device (10).
CN201711408703.8A 2017-12-22 2017-12-22 A kind of denitration device of power plant Withdrawn CN107930397A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711408703.8A CN107930397A (en) 2017-12-22 2017-12-22 A kind of denitration device of power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711408703.8A CN107930397A (en) 2017-12-22 2017-12-22 A kind of denitration device of power plant

Publications (1)

Publication Number Publication Date
CN107930397A true CN107930397A (en) 2018-04-20

Family

ID=61939751

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711408703.8A Withdrawn CN107930397A (en) 2017-12-22 2017-12-22 A kind of denitration device of power plant

Country Status (1)

Country Link
CN (1) CN107930397A (en)

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Application publication date: 20180420