CN208694661U - Sintering flue gas plasma/urea method simultaneous SO_2 and NO removal system - Google Patents
Sintering flue gas plasma/urea method simultaneous SO_2 and NO removal system Download PDFInfo
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- CN208694661U CN208694661U CN201821047575.9U CN201821047575U CN208694661U CN 208694661 U CN208694661 U CN 208694661U CN 201821047575 U CN201821047575 U CN 201821047575U CN 208694661 U CN208694661 U CN 208694661U
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- 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
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Abstract
The utility model relates to a kind of sintering flue gas plasma/urea method simultaneous SO_2 and NO removal systems, are made of gas flow path and liquid flow path, the desulfurization and denitration for sintering flue gas.In gas flow path, first setting reaction of low temperature plasma device, after sintering flue gas is processed, part NO is oxidized to NO2, reduce the difficulty of subsequent desulphurization denitration；Then, flue gas enters concentration temperature-reducing tower, is sprayed by mother liquor, temperature decline, and mother liquor is then concentrated；In desulphurization denitration tower, flue gas enters tower body from bottom, inversely contacts, chemically reacts with urea liquid, the SO in flue gas2It is removed with the NOx overwhelming majority.It is related to being respectively provided with demister behind two towers of liquid spray, to reduce influence of the water mist to subsequent process.Five pumps are provided with, on liquid flow path to realize the purpose of liquid supply, spray and transmission.The utility model have the advantages that desulfurization and denitration efficiency are high, energy-saving, equipment is simple, land occupation less, operating cost it is low, it is easy to operate, convenient for management.
Description
Technical field
The utility model relates to a kind of sintering flue gas plasma/urea method simultaneous SO_2 and NO removal systems, and it is de- to belong to flue gas
Sulphur denitration technology field.
Background technique
The sintering process of iron and steel enterprise discharges sulfur dioxide (SO2) and nitrogen oxides (NOx), atmosphere can be polluted, be needed
It administers.Existing Treatment process mainly have 1. lime stone-gypsum method flue gas desulfurization system desulfurization+selective catalytic reduction it is de-
Nitre technology (SCR) denitration: this method desulphurization denitration rate is respectively 90% and 80% or more, but there are catalyst surface foulings in
The device is complicated for poison, heat exchanger blocking and burn into, takes up a large area, capital expenditure is more, rebuilding construction difficulty greatly, operational management not
Just the problems such as；2. the ammonia process of desulfurization: this method desulfuration efficiency is higher, but denitration ability is poor, and there are the escaping of ammonia, equipment seriously corroded
Problem.
Summary of the invention
The utility model partially can keep and develop above-mentioned advantage and can overcome the problems, such as it is above-mentioned exist, provide a kind of desulfurization and
Denitration efficiency is high, can save energy, and equipment is simple, and land occupation is few, and operating cost is low, easy to operate, convenient for sintering flue gas of management etc. from
Daughter/urea method simultaneous SO_2 and NO removal system.
The technical solution of the utility model are as follows: it is anti-that the flue gas from sintering dust device sequentially enters low temperature plasma
It answers device, concentration temperature-reducing tower, vertical demister, desulphurization denitration tower, emptied through chimney after board-like demister.In low temperature plasma
Reactor, part NO are oxidized to NO2.Flue gas after oxidation enters from concentration cooling column overhead, connects with desulphurization denitration mother liquor
Touching, mother liquor, which is evaporated, becomes saturated ammonium sulfate, ammonium nitrate solution, enters byproduct recovery process, flue gas by mother liquor emptying pump
Cooled down simultaneously；Process water in technique water tank divides two-way after the pressurization of technique water pump, is respectively used to vertical demister and board-like
Demister demisting；Vertical demister is used to cut down the water mist of flue gas entrainment, and the temperature of flue gas is further decreased；After cooling
Flue gas enters desulphurization denitration tower lower part, and absorbing liquid circulating pump and desulphurization denitration liquid emptying pump is arranged in desulphurization denitration tower bottom, the former
Outlet couple circulation fluid spray head, the absorbing liquid of sprinkling contacts with flue gas adverse current, chemically reacts, SO therein2And NOx
Major part is removed, and the outlet of the latter then couples concentration temperature-reducing tower；Finally, flue gas is arranged through board-like demister demisting, again through chimney
It is empty.
Compared with existing simultaneous SO_2 and NO removal technique, the invention has the advantages that.
The 1, present invention uses reaction of low temperature plasma device, part NO can be catalytically oxidized to NO2, to improve
The overall solubility and removal efficiency of NOx.
2, are absorbent with urea liquid, low in cost and be easy to get, can be one in conjunction with low temperature plasma oxidation technology
SO is removed in set system simultaneously2And NOx, process equipment is simple, takes up an area less, is easy to operate, convenient for management.
3, take the technology first to cool down, and urea is not susceptible to hydrolyze at such a temperature, escape so not will cause absorbent
Ease, overcome with ammonia for absorb be technology in this regard the shortcomings that.
The 4, present invention are applicable not only to newly-built sintering flue gas desulfurization denitration project, are also suitable for changing existing desulfurizing item
It makes, transformation is simple, and construction volume is small, low cost.
The ammonium sulfate and ammonium nitrate that 5, inventive desulfurization denitrification process generate, after purification appropriate, separation and purification
It can be used as agricultural fertilizer or industrial chemicals, belong to circular economy project, economic benefit and social benefit are good.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
In Fig. 1, reaction of low temperature plasma device (1), concentration temperature-reducing tower (2), Recycling Mother Solution pump (3), mother liquor emptying pump
(4), mother liquor spray head (5), vertical demister (6), desulphurization denitration tower (7), board-like demister (8), circulation fluid spray head (9), absorption
Liquid circulating pump (10), desulphurization denitration liquid emptying pump (11), urea liquid storage tank (12), chimney (13), technique water tank (14), process water
It pumps (15).
Specific embodiment
Process shown in referring to Fig.1, implements according to the following steps.
1, reaction of low temperature plasma device (1): selecting variable frequency alternating current power source, and discharge treatment power is 3~5W/m3,
Gas residence time is 4~6 seconds, and during which 40%~50% NO is catalytically oxidized to NO in flue gas2。
2, temperature-reducing tower (2) are concentrated: select stainless steel inner lining glass fibre reinforced plastic structure；Gas flow rate about 5m/s, residence time about 6
Second, flue-gas temperature is down to 90 DEG C by 150 DEG C, and mother liquor, which then absorbs heat, to be concentrated.
3, vertical demister (6): the baffle plate demister with nozzle is selected, when flue gas passes through baffle plate, in inertia and again
The drop separation carried secretly in air-flow is come out under the action of power, and the temperature of flue gas is down to 70 DEG C.
4, desulphurization denitration tower (7): stainless steel inner lining glass fibre reinforced plastic structure is selected；Empty tower gas velocity is 3~4m/s, residence time
15~20 seconds, urea concentration was 10%~15%, and flue gas is contacted with urea liquid in this tower counter-flow, SO therein2With
NOx is largely removed.
5, board-like demister (8): selecting the baffle plate demister with nozzle, the water of the gas after removing desulphurization and denitration
Mist, after emptied through chimney.
6, liquid flow path: the urea liquid that urea liquid storage tank (12) comes out is added before absorbing liquid circulating pump (10), reversible
Stream enters the lower part of desulphurization denitration tower (7), can also be transported to by absorbing liquid circulating pump (10) circulation fluid spray head (9)；Through desulfurization, take off
After urea weak solution after nitre reaction falls on the lower part of desulphurization denitration tower (7), a part and the urine for coming from urea liquid storage tank (12)
Plain dope mixing is re-used for spraying, and another part is delivered to concentration temperature-reducing tower (2) through desulphurization denitration liquid emptying pump (11)
Lower part, dilution original are present in this mother liquor, for concentration temperature-reducing tower (2) spray.In concentration temperature-reducing tower (2), mother liquor is followed through mother liquor
Ring pump (3), mother liquor spray head spray after (5) from the top of tower, and with the higher smoke contacts of temperature, flue gas is cooled, mother liquor
It is concentrated；It is concentrated to a degree of mother liquor and is delivered to byproduct recovery process through mother liquor emptying pump (4).In technique water tank (14)
Process water through technique water pump (15) pressurization after divide two-way, be respectively used to rinse vertical demister (6) and board-like demister (8),
Process water after flushing imports concentration temperature-reducing tower (2) and desulphurization denitration tower (7).
Claims (1)
1. sintering flue gas plasma/urea method simultaneous SO_2 and NO removal system, including gas flow path and liquid flow path, feature exist
In: in gas flow path, the connection sequence of each equipment are as follows: reaction of low temperature plasma device (1) --- concentration temperature-reducing tower (2) --- is perpendicular
Formula demister (6) --- desulphurization denitration tower (7) --- board-like demister (8) --- chimney (13)；In liquid flow path: urea solution storage
Before tank (12) is attached to absorbing liquid circulating pump (10), urea solution passes through circulation fluid spray head (9) after mixing with absorbing liquid and sprays into desulfurization
In denitrating tower (7)；Desulphurization denitration liquid emptying pump (11) are arranged in desulphurization denitration tower (7) lower part, which enters desulphurization denitration liquid pump dense
Contracting temperature-reducing tower (2) lower part；Recycling Mother Solution pumps (3) and takes out mother liquor to mother liquor spray head (5), mother liquor discharge from concentration temperature-reducing tower (2) lower part
Pump (4) couples with byproduct recovery process；Technique water tank (14) connecting process water pump (15), is pumped into vertical demister (6) and plate
Formula demister (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821047575.9U CN208694661U (en) | 2018-07-04 | 2018-07-04 | Sintering flue gas plasma/urea method simultaneous SO_2 and NO removal system |
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| CN201821047575.9U CN208694661U (en) | 2018-07-04 | 2018-07-04 | Sintering flue gas plasma/urea method simultaneous SO_2 and NO removal system |
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| CN208694661U true CN208694661U (en) | 2019-04-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430366A (en) * | 2021-06-03 | 2021-09-24 | 北京首钢股份有限公司 | Sintering material using urea as desulfurizer and sintering method |
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2018
- 2018-07-04 CN CN201821047575.9U patent/CN208694661U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430366A (en) * | 2021-06-03 | 2021-09-24 | 北京首钢股份有限公司 | Sintering material using urea as desulfurizer and sintering method |
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