CN205182515U - Automatic that adjusts ammonia volume spouts ammonia device - Google Patents
Automatic that adjusts ammonia volume spouts ammonia device Download PDFInfo
- Publication number
- CN205182515U CN205182515U CN201520860765.2U CN201520860765U CN205182515U CN 205182515 U CN205182515 U CN 205182515U CN 201520860765 U CN201520860765 U CN 201520860765U CN 205182515 U CN205182515 U CN 205182515U
- Authority
- CN
- China
- Prior art keywords
- ammonia
- flue
- gas
- spray
- house steward
- 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.)
- Active
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model provides an automatic that adjusts ammonia volume spouts ammonia device, it sets up in the flue to spout the ammonia device, spout the ammonia device including spouting the ammonia house steward, spouting ammonia branch pipe, nozzle, gas collecting channel and floating valve, spouting the ammonia house steward and becoming the vertical direction through flue one side with the flue and penetrate the flue, wherein, the ammonia house steward one end of spouting that is located the flue is the blind end, and the other end that spouts the ammonia house steward is connected with the ammonia supply equipment, and be located spouting of flue and seted up a plurality of holes on the ammonia house steward, spout ammonia branch pipe one end and spout the hole of seting up on the ammonia house steward and link to each other, spout the ammonia branch pipe other end stretch into with the gas collecting channel in, and spout and be provided with the floating valve in the space that ammonia branch pipe and gas collecting channel formed, gas collecting channel upper end center is provided with the nozzle. The utility model discloses spout the area that the ammonia device can dynamic adjustment ammonia passageway, realized the matching of ammonia volume and gas distribution situation, satisfy the requirement of SCR technique to ammonia spray deposition uniformity.
Description
Technical field
The utility model relates to flue gases purification field, particularly relates to a kind of ammonia-gas spraying device of automatic adjustment ammonia amount.
Background technology
Nitrogen oxide (NOx) is one of primary pollution source of atmosphere pollution, comprises multiple compounds as nitrous oxide (N
2o), nitric oxide (NO), nitrogen dioxide (NO
2), nitrogen trioxide (N
2o
3) etc.Except nitrogen dioxide, the equal extremely unstable of other nitrogen oxide, meet light, wet or thermal change becomes nitrogen dioxide and nitric oxide, nitric oxide becomes nitrogen dioxide again.Therefore, what contact in occupational environment is that several admixture of gas is often called the smoke of gunpowder (gas), is mainly nitric oxide and nitrogen dioxide, and based on nitrogen dioxide.
NOx has toxicity in various degree, is the major reason forming photochemical fog and acid rain based on the NOx of nitric oxide and nitrogen dioxide.NOx in vehicle exhaust and hydrocarbon to react the toxic smog formed through Ultraviolet radiation, are called photochemical fog.Photochemical fog has special odor, stimulates eyes, injury plant, and atmospheric visibility can be made to reduce.In addition, the water in NOx and air reacts the composition that the nitric acid that generates and nitrous acid are acid rain.
The NOx be discharged in air mainly contains three sources: power plant's (accounting for 46%), vehicle exhaust (accounting for 49%) and oil-refining chemical factory (accounting for 5%).The NOx total amount that the whole world enters air every year about reaches 5 × 10
7ton, 2008, China's NOx discharge has reached 2,000 ten thousand tons, become the first in the world large discharge state, if do not add control, expect the year two thousand twenty, NOx discharge will reach 3,000 ten thousand tons, China the Eleventh Five-Year Plan period cuts down the effort of sulfur dioxide 10%, also the remarkable rising because of NOx discharge is all offset.At present, China includes NOx in " 12 " period overall control category as the binding indicator.
China " air comprehensive pollution thing discharge standard ~ GBI6297 ~ 1996 " and " emission standard of air pollutants for boilers ~ GWPB3 ~ 1999 " all restrict the discharge of NOx, and the former specifies: the highest permission concentration of emission of old pollution sources: 420mg/m
3, new pollution sources are 240mg/m
3.
SCR(SCR) gas denitrifying technology is one of gas denitrifying technology be most widely used, and compared with other technologies, has denitration efficiency high, selective good, the advantages such as stable and reliable operation.Its principle is under catalyst action, utilizes reducing agent selectively to react with the NOx in flue gas, and generates the N of nonhazardous effect
2and H
2the technology of O, its reducing agent can be ammonia, ammoniacal liquor or urea, also can select CO or H
2, also can select Small molecular alkane.
In SCR gas denitrifying technology, ammonia (NH
3) and nitrogen oxide (NO
x) mixed effect and the denitration efficiency of denitrification apparatus have close relationship, if reducing agent and NO
xwhat mix is insufficient, can cause NH in regional area
3/ NO
xmol ratio is too low, will greatly reduce system denitration efficiency.In the case, want to reach NO
xdischarge capacity index request, by the increase consumption of catalyst or the consumption of ammonia, certainly will cause operating cost to increase or amount of ammonia slip increase, forms secondary pollution.
Traditional NH
3and NO
xnH is utilized in mixed method
3and NO
xbetween concentration difference, mixed by natural diffuseness mode, therefore need the mixing distance grown very much, and NH
3and NO
xundercompounding.
CN200910104626.6 describes a kind of the SCR denitration technique and the denitrification apparatus that adopt non-equal diameter spray orifice ammonia-spraying grid, by adopting the ammonia-spraying grid of non-equal diameter spray orifice, the diameter in each spray ammonia hole reduces gradually with ammonia flow direction, thus ensure in spray ammonia process, ammonia amount in each spray ammonia hole keeps identical, ensures denitration effect.The weak point of this structure is, for flue gas pockety, can produce ammonia and the uneven phenomenon of flue gas melting concn, namely the position that flue gas flow rate is large, ammonia amount relative deficiency, reduces denitration efficiency, the position that flue gas flow rate is little, ammonia amount relative surplus, forms the escaping of ammonia.
CN200920045181.4 describes a kind of ejection ammonia mixing arrangement of SCR reaction unit, by arranging several distributing pipe, the method every root distributing pipe only retaining a small amount of nozzle makes ammonia amount in each nozzle keep identical, again by the static mixing blade below nozzle, strengthen the mixed effect of ammonia and flue gas.The weak point of this structure is, a spray ammonia pipe is become several distributing pipe, flow in each distributing pipe can be caused to interfere with each other, increase and control difficulty, to the adaptive capacity extreme difference of ammonia amount fluctuation.Meanwhile, each distributing pipe is all equipped with flowmeter and control valve, increases great amount of investment.
Because ammonia has certain flow velocity spray ammonia house steward, so spray, according to Bernoulli equation prior to the nozzle of spray ammonia house steward far-end, when gas stagnation pressure is constant, along with the ejection of ammonia in pipeline, in spray ammonia pipe, the dynamic pressure of gas reduces, and static pressure rises.And the gas flow of each nozzle ejection depends on nozzle area, the difference of gas static pressure and nozzle place flue gas pressures in spray ammonia pipe, so identical in nozzle area, when in flue, flue gas pressures is consistent, there is the trend increased gradually along the bearing of trend spraying ammonia house steward in the gas flow of each nozzle ejection, cause ammonia skewness, affect denitration effect.
Utility model content
Not enough for prior art, the utility model provides a kind of ammonia-gas spraying device of automatic adjustment ammonia amount, is intended to solve in prior art spray ammonia skewness in ammonia pipe, to the problem of the adaptation deficiency of smoke distribution uniformity.
The utility model provides a kind of ammonia-gas spraying device of automatic adjustment ammonia amount, and described ammonia-gas spraying device is arranged in flue, and described ammonia-gas spraying device comprises spray ammonia house steward, spray ammonia arm, nozzle, gas skirt and float valve; Described spray ammonia house steward becomes vertical direction to penetrate flue through flue side with flue, wherein, the spray ammonia house steward one end being positioned at flue is blind end, the other end of spray ammonia house steward is connected with ammonia supply equipment, the spray ammonia house steward upper end being positioned at flue offers some holes, described spray ammonia arm one end is connected with the hole that spray ammonia house steward offers, the described spray ammonia arm other end extend into in gas skirt, and being provided with float valve in spray ammonia arm and the space that formed of gas skirt, described gas skirt upper end center is provided with nozzle.
In the utility model ammonia-gas spraying device, the seal of tube can be propped up with spray ammonia in described gas skirt lower end, also can with spray ammonia total seal of tube, upper end is connected with flue gas by nozzle.
In the utility model ammonia-gas spraying device, described float valve can move up and down along spray ammonia arm, described float valve upper end sealing, and when not using, its height should meet lower end and just cover spray ammonia hole.Minim gap is had between described float valve and spray ammonia arm outer wall.The lower edge of described float valve offers teeth groove, and described teeth groove can be rectangle, triangle or semicircle.In the utility model ammonia-gas spraying device, without rigid connection between described float valve and spray ammonia arm, can use and to flexibly connect or without connection.
In the utility model ammonia-gas spraying device, described float valve height should be greater than on spray ammonia arm along and gas skirt on along between distance.
In the utility model ammonia-gas spraying device, the weight G of described float valve should meet G < (P
1-P
a) × S.
In the utility model ammonia-gas spraying device, described nozzle center, the center of gas skirt center and spray ammonia arm on an axis.
In the utility model ammonia-gas spraying device, described nozzle spray direction can with flue gas in the same way, also can be reverse with flue gas.
In the utility model ammonia-gas spraying device, described gas skirt cross section can be circular, rectangle or other shapes.
In the utility model ammonia-gas spraying device, described spray ammonia arm sidewall has several spray ammonia holes.
Compared with prior art, the present invention is by utilizing the motive force of ammonia self, the area of dynamic adjustments ammonia passage, achieve the coupling of ammonia amount and smoke distribution situation, meet the requirement of SCR technology to ammonia distributing homogeneity, solve the problem that conventional ammonia-spraying grid cannot regulate ammonia flow automatically, there is structure simple, adaptable, the advantages such as implementation result is good, are applicable to applying.
Accompanying drawing explanation
Fig. 1 is the structural representation of ammonia-gas spraying device described in the utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the ammonia-gas spraying device of ammonia amount that can automatically regulate described in the utility model is described further.
As shown in Figure 1, the utility model ammonia-gas spraying device is positioned at flue, and described ammonia-gas spraying device is arranged in flue, and described ammonia-gas spraying device comprises spray ammonia house steward 1, spray ammonia arm 2, nozzle 5, gas skirt 4 and float valve 3, described spray ammonia house steward 1 becomes vertical direction to penetrate flue through flue side with flue, wherein, spray ammonia house steward 1 one end being positioned at flue is blind end, the other end of spray ammonia house steward 1 is connected with ammonia supply equipment, spray ammonia house steward 1 upper end being positioned at flue offers some holes, described spray ammonia arm 2 one end is connected with the hole that spray ammonia house steward 1 offers, described spray ammonia arm 2 other end extend into in gas skirt 4, and be provided with float valve 5 in the space that formed of spray ammonia arm 2 and gas skirt 4, described gas skirt 4 upper end center is provided with nozzle 5, gas skirt 4 lower end seals with spray ammonia arm 2, the center of three on the same axis.
The present invention is a kind of can be regulated in the ammonia-gas spraying device of ammonia amount automatically, and float valve 3 upper end seals, and lower end has rectangle teeth groove, and is connected with nothing between spray ammonia arm 2.The weight of float valve meets G < (P
1-P
a) × S.
According to Bernoulli equation, when gas stagnation pressure is constant, along with the ejection of ammonia in pipeline, in spray ammonia pipe, the dynamic pressure of gas reduces, and static pressure rises.And the gas flow of each nozzle ejection depends on nozzle area, the difference of gas static pressure and nozzle place flue gas pressures in spray ammonia pipe, the present invention dynamically changes ammonia aisle spare, and then controls ammonia spray volume, realizes ammonia in each spray ammonia arm and is uniformly distributed.
As shown in Figure 1, in use, ammonia sprays into through spray ammonia house steward 1 with certain speed ammonia-gas spraying device of the present invention, and under effect of inertia, the preferential spray ammonia arm 2 by distalmost end.Ammonia promotes float valve 3 and moves upward, mix through ammonia passage 6 and nozzle 5 with flue gas after entering spray ammonia arm 2.
Along with the ejection of ammonia in pipeline, in spray ammonia pipe, the dynamic pressure of gas declines, static pressure P
1rise, float valve 3 continues to move up, and ammonia passage 6 area reduces.Along with the area of ammonia passage 6 reduces, the ammonia amount sprayed from nozzle 5 reduces thereupon, and in spray ammonia pipe, the dynamic pressure of gas is risen, static pressure P
1decline, float valve 3 falls after rise.
When whole spray ammonia process reach stable after, meet P
1× S
1=G(reed)+P
a× S
2, for certain ammonia-gas spraying device and working environment, on the right side of formula and S
1for definite value, due to P in each arm
1there is the trend increased gradually along the bearing of trend spraying ammonia house steward in value, along with P
1the increase successively of value, the area of ammonia passage 6 reduces successively, realizes the dynamic adjustments to ammonia spraying amount.
It can also be seen that viewed from this formula, f
1be actually relevant to the pressure reduction inside and outside nozzle, no matter (P time therefore flue gas flows uniformly through same spray ammonia supervisor in flue
a=P
b=P
c), or uneven (P when flowing through
a≠ P
b≠ P
c), can the area of free adjustment ammonia passage 6, ensure that ammonia is uniformly distributed, realizing ammonia amount can according to the distribution situation free adjustment of flue gas.
Claims (9)
1. automatically regulate an ammonia-gas spraying device for ammonia amount, described ammonia-gas spraying device is arranged in flue, and described ammonia-gas spraying device comprises spray ammonia house steward, spray ammonia arm, nozzle, gas skirt and float valve; Described spray ammonia house steward becomes vertical direction to penetrate flue through flue side with flue, wherein, the spray ammonia house steward one end being positioned at flue is blind end, the other end of spray ammonia house steward is connected with ammonia supply equipment, the spray ammonia house steward upper end being positioned at flue offers some holes, described spray ammonia arm one end is connected with the hole that spray ammonia house steward offers, the described spray ammonia arm other end extend into in gas skirt, and being provided with float valve in spray ammonia arm and the space that formed of gas skirt, described gas skirt upper end center is provided with nozzle.
2. according to ammonia-gas spraying device according to claim 1, it is characterized in that: described gas skirt lower end is with spray ammonia arm or spray ammonia house steward and be tightly connected.
3. according to ammonia-gas spraying device according to claim 1, it is characterized in that: without rigid connection between described float valve and spray ammonia arm, use and to flexibly connect or without connection.
4., according to ammonia-gas spraying device according to claim 1, it is characterized in that: described float valve height should be greater than on spray ammonia arm along and gas skirt on along between distance.
5. according to ammonia-gas spraying device according to claim 1, it is characterized in that: described nozzle center, the center of gas skirt center and spray ammonia arm on an axis.
6. according to ammonia-gas spraying device according to claim 1, it is characterized in that: described nozzle spray direction and flue gas are in the same way or reverse.
7. according to ammonia-gas spraying device according to claim 1, it is characterized in that: the sealing of described float valve upper end, lower edge offers teeth groove.
8. according to ammonia-gas spraying device according to claim 7, it is characterized in that: described teeth groove is rectangle, triangle or semicircle.
9. according to ammonia-gas spraying device according to claim 1, it is characterized in that: described spray ammonia arm sidewall has several spray ammonia holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520860765.2U CN205182515U (en) | 2015-11-02 | 2015-11-02 | Automatic that adjusts ammonia volume spouts ammonia device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520860765.2U CN205182515U (en) | 2015-11-02 | 2015-11-02 | Automatic that adjusts ammonia volume spouts ammonia device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205182515U true CN205182515U (en) | 2016-04-27 |
Family
ID=55775554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520860765.2U Active CN205182515U (en) | 2015-11-02 | 2015-11-02 | Automatic that adjusts ammonia volume spouts ammonia device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205182515U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974950A (en) * | 2016-07-05 | 2016-09-28 | 王巧英 | Intra-furnace flue gas denitration ammonia spraying intelligent system and control method thereof |
| CN109482065A (en) * | 2017-09-09 | 2019-03-19 | 中国石油化工股份有限公司 | A kind of denitration process method of ethane cracking furnace discharge flue gas |
-
2015
- 2015-11-02 CN CN201520860765.2U patent/CN205182515U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974950A (en) * | 2016-07-05 | 2016-09-28 | 王巧英 | Intra-furnace flue gas denitration ammonia spraying intelligent system and control method thereof |
| CN105974950B (en) * | 2016-07-05 | 2019-07-05 | 王巧英 | Ammonia intelligence system and its control method are sprayed in inner flue gas of the stove denitration |
| CN109482065A (en) * | 2017-09-09 | 2019-03-19 | 中国石油化工股份有限公司 | A kind of denitration process method of ethane cracking furnace discharge flue gas |
| CN109482065B (en) * | 2017-09-09 | 2021-04-06 | 中国石油化工股份有限公司 | Denitration treatment method for exhaust gas of ethylene cracking furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203264545U (en) | Ammonia escape preventing device used in flue gas ammonia desulphurization and denitrification process | |
| CN202569946U (en) | Ammonia injection automatic control device for flue gas denitration by selective non-catalytic reduction (SNCR) method | |
| CN202606007U (en) | Ammonia desulfurization and denitrification tower | |
| CN102179157B (en) | Ammonia spraying grate and adjusting method thereof | |
| CN202683062U (en) | Amino selective non-catalytic reduction (SNCR) flue gas denitration device | |
| CN107789967B (en) | Sintering flue gas low-temperature denitration device and implementation method thereof | |
| CN106166437A (en) | A kind of cement kiln flue gas desulphurization system and method | |
| CN106166434A (en) | A kind of ozone oxidation double tower ammonia process of desulfurization denitrating technique and system thereof | |
| CN102527233A (en) | Zoning-regulating double-layer ammonia injection grid applied to selective catalytic reduction denitrification device for industrial flue gas | |
| CN205182515U (en) | Automatic that adjusts ammonia volume spouts ammonia device | |
| CN107398175B (en) | Desulfurization and denitrification integrated reactor for carbon-based catalyst | |
| CN103007750B (en) | Ammonia spraying device for flue gas denitrification | |
| CN107008144B (en) | Device for realizing SCR flue gas denitration multistage ammonia spraying and flue gas denitration method | |
| CN205886604U (en) | SCR denitration ammonia injection system with oval plate mixed flow ware | |
| CN205995253U (en) | A kind of cement kiln flue gas desulphurization system | |
| CN208527026U (en) | A kind of ammonia-spraying grid nozzle with anti-blocking flow equalizing function | |
| CN206535429U (en) | A kind of SCR denitration spray ammonia system for adapting to full load mode | |
| CN107456868A (en) | A kind of ammonia-gas spraying device for SCR denitration reactor | |
| CN205109403U (en) | Can automatically regulated ammonia volume spout ammonia device | |
| CN202962241U (en) | Device for synergistically removing flue gas mercury | |
| CN204911185U (en) | Non - catalytic reduction SNCR reaction system of selectivity | |
| CN201249102Y (en) | Flue-gas denitration vortex mixer | |
| CN209985210U (en) | Ammonia injection device of anchor coal-fired power plant denitration catalyst module | |
| CN109289573B (en) | Gas mixing device and method applied to denitration system | |
| CN202460472U (en) | Double-layer ammonia injection grid used in industrial flue gas selective catalytic reduction (SCR) denitration device and having zone adjustment function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |