CN202382991U - Denitrification flue gas sampling and pretreatment device - Google Patents
Denitrification flue gas sampling and pretreatment device Download PDFInfo
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- CN202382991U CN202382991U CN2011205588492U CN201120558849U CN202382991U CN 202382991 U CN202382991 U CN 202382991U CN 2011205588492 U CN2011205588492 U CN 2011205588492U CN 201120558849 U CN201120558849 U CN 201120558849U CN 202382991 U CN202382991 U CN 202382991U
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Abstract
The utility model discloses a denitrification flue gas sampling and pretreatment device, belonging to the field of flue gas discharging and collecting devices. The denitrification flue gas sampling and pretreatment device comprises a sampling, heating and filtering unit, a back flushing control unit and an ammonium salt washing unit, wherein the ammonium salt washing unit is connected with a gas outlet of a sampling, heating and filtering cavity through a pipeline, and one end of the back flushing control unit is connected with a gas outlet of the sampling, heating and filtering unit. Under the condition that the device automatically controls the heating of the sampling unit, the power consumption of the equipment is not reduced without crystallizing the ammonium salt; NH3 is completely eliminated to prevent stoppage; the ammonium salt adhered to an ammonium salt washing bottle and nanometer washing beads can be directly washed with clear water and is convenient to recover and utilize, and the back flushing control unit achieves the prospective black flushing effect on a sampling probe lever and a filter.
Description
Technical field
The present invention relates to a kind of fume emission harvester, particularly a kind of denitration flue gas sampling and pretreatment unit.
Background technology
Along with China's rapid economy development, the thermal power generation cause is flourish, has become the main generation mode of China's power supply architecture.Electric power energy has also caused certain pollution to environment when offering convenience to us, mainly be because due to thermal power generation incomplete combustion and the generation secondary product.According to statistics, the NOx in China's atmosphere pollution more than 90% comes from the combustion process of mineral fuel (like coal, oil, rock gas etc.), and wherein 70% from burning of coal, and thermal power plant's coal for power generation has accounted for 70% of national fire coal.After NOx gets into atmosphere, under effect of sunlight, be prone to form chemical fumes, insulting respiratory system, NO still destroy atmospheric ozone layer and one of precursor gas that forms acid rain, destroy ecologic environment.
SCR is a gas denitrifying technology commonly used at present, utilizes reductive agent (NH
3, urea) and under the metallic catalyst effect, optionally generate N with the NOx reaction
2And H
2O.Owing to contain sulphur content in the fuel, can generate a certain amount of SO in the combustion process
3After adding catalyzer, under aerobic conditions, SO
3Growing amount significantly increase, and with excessive N H
3Generate NH
4HSO
4NH
4HSO
4Have corrosivity and viscosity, can cause the back-end ductwork device damage.Though SO
3Growing amount limited, but its influence that causes can not be underestimated.
Denitrating technique is other flue gas treating process such as sulfur removal technology relatively, and its special character is arranged, and shows that flue-gas temperature is high, generally in 300 ~ 400 ℃, flue gas, contains remaining NH
3, when the cigarette temperature is lower than 230 ℃, NH
3And SO
2, SO
3Know from experience generation chemical reaction generation stickum ammonium salt Deng sour gas, can stop up sampling unit, heating sample line with dust at short notice, even jeopardize gas analysis instrument.Flue gas sampling device at present commonly used directly extracts flue gas through the sampling feeler lever; Flue gas is removed impurity such as particle, dust through filtration unit; The gas outlet is connected with heater wire one end, and the heater wire other end is connected with the gas analysis instrument air intake opening, and the blowback unit is in the heater wire rear end; Blowback air arrives the sampling feeler lever through heater wire, puts blowback in order.Such sampling apparatus technology is comparatively simple, but is used to gather the denitration flue gas, has following problem, 1. contains little amount of N H in the denitration flue gas
3, when the cigarette temperature is lower than 230 ℃, NH
3And SO
2, SO
3Know from experience generation chemical reaction generation stickum ammonium salt Deng sour gas, can stop up filter core and heating sample line with dust at short notice; 2. after blowback gas circuit is contained in sampling apparatus, can not can not reach the blowback effect of expection to sample feeler lever and filtrator.
Chinese patent publication number CN 201522394 U; Integrated sampling and pretreatment unit; File discloses as shown in Figure 1, and this device is mainly formed by extracting probe, the pneumatic sampling ball valve of stainless steel, moisture trap, peristaltic pump and stainless steel blowback solenoid valve fully.Adopting extraction fully to pop one's head in samples; The heating-up temperature of probe is more than about 350 ℃; Adopt flue gas the water vapor condensation in the flue gas to be become aqueous water through moisture trap; Salts substances in the flue gas forms solid-state at normal temperatures and is dissolved in condensate water, is drained by peristaltic pump in the lump, and flue gas is discharged from moisture trap top; The blowback solenoid valve is regularly opened ceramic element is carried out blowback; Prevent that ceramic element from not stopping up because of working long hours; This sampling and pretreatment unit have improved the online rate of denitration flue gas discharge continuous monitoring system to a certain extent; Improve the usability of CEMS, but also have following problem: (1) this device heating unit is confined to extract fully probe, follow-up pipeline is not taked the heat tracing measure; This can cause flue gas in pipeline, to cool off, and does not consider ammonium salt crystallization in gas circuit; (2) pressurized air can cause the cooling that extraction is fully popped one's head in and cause condensation when carrying out blowback; When (3) flue gas is through moisture trap, owing to these parts are not taked the heat tracing measure, when the cigarette temperature is lower than the ammonium salt crystallization temperature, can forms ammonium salt crystallization and stick to the gas-water separation wall, long-play causes the obstruction of gas circuit.
Summary of the invention
1. invent the technical matters that will solve
To the problem that existing flue gas sampling device runs in the actual use of denitration flue gas, the present invention provides a kind of denitration flue gas sampling and pretreatment unit, realizes integrated sampling and pre-service, has the function that prevents flue gas condensing and ammonium salt crystallization; Adopt the ammonium salt cleaning device simultaneously, effectively remove the NH in the flue gas
3, ammonium salt sticks to nanometer and cleans bead surface, is easy to clean be convenient to recycle, and prevents that the ammonium salt washer bottle from producing obstruction because of long-play.
2. technical scheme
A kind of denitration flue gas sampling and pretreatment unit comprise sampling heating and filtering chamber, blowback control module; Also comprise the ammonium salt cleaning unit; Wherein the ammonium salt cleaning unit is connected through the gas outlet of pipeline with sampling heating and filtering chamber, and blowback control module one end is connected with the gas outlet in sampling heating and filtering chamber.
Said sampling heating and filtering chamber comprises sampling feeler lever, heating and filtering chamber, temperature conditioning unit; Sampling feeler lever material is selected the high temperature resistant material of corrosion resistant for use; The high temperature resistant material of corrosion resistant is SS316 (stainless steel 316), SS316L (stainless steel 316L) or SS304 (stainless steel 304), and wherein the heating and filtering chamber comprises heating rod, refractory ceramics filtrator, graphite interlayer, chamber lid, heating aluminium block, and it is inner that heating rod is fixed on sampling feeler lever probe; Wrap up with insulation material the outside; The refractory ceramics filter bits is inner in the heating and filtering chamber, and the heating aluminium block is positioned at heating rod and the refractory ceramics filtrator is outside, and the graphite interlayer is between heating and filtering cavity and chamber lid.It is inside and outside that the thermo-sensitive material of temperature conditioning unit and control module lay respectively at the heating and filtering chamber.
Said ammonium salt cleaning unit comprises ammonium salt washer bottle, peristaltic pump composition, air hose and heat tracing unit, wherein on ammonium salt washer bottle air intake opening and the pipeline that the gas outlet in sampling heating and filtering chamber is connected the heat tracing unit is set.The ammonium salt washer bottle is made up of loam cake and bottle; Loam cake is selected the corrosion-resistant thermal insulation material for use, and inside is equipped with the nanometer ammonium salt and is cleaned pearl, and the nanometer ammonium salt cleans pearl and adheres to ammonium salt for the ammonium salt load provides bigger specific surface area; The nanometer ammonium salt cleans pearl and can clean with clear water, can recycle.Flue gas gets in the bottle from the top of ammonium salt washer bottle, because the nanometer ammonium salt cleans the flow velocity that the existence of pearl has slowed down gas, has increased contact area, makes unnecessary NH
3And SO
2, SO
3There is time enough to react and generates NH
4HSO
4, make NH unnecessary in the gas
3Be able to remove, utilize the nanometer ammonium salt to clean pearl simultaneously and make stickum NH
4HSO
4Directly be adsorbed on its surface, because a spot of water of the low formation of cigarette temperature drop, ammonium salt washer bottle bottom links to each other with peristaltic pump one end through air hose, through the peristaltic pump effect condensate water is discharged, and pretreatment gas is then discharged from ammonium salt washer bottle side opening.
Said blowback control module comprises high temperature stainless steel pneumatic valve, first solenoid valve, second solenoid valve; The first threeway gas connection, the second threeway gas connection, the 3rd threeway gas connection, first reverse checkvalve; First reverse checkvalve and blowback heat air source apparatus; At inner solenoid valve, the reverse checkvalve installed of denitration flue gas sampling device, combined electrical, pneumatics have realized the two-way in sampling heating and filtering chamber blowing function on the spot.Each assembly connects as follows:
An exhausr port of the first threeway gas connection links to each other with first reverse checkvalve; Another exhausr port links to each other with the high temperature stainless steel pneumatic valve; The gas outlet of high temperature stainless steel pneumatic valve is connected with the ammonium salt washer bottle through pipeline, and ammonium salt washer bottle bottom water delivering orifice is connected with peristaltic pump; Sampling heating and filtering chamber is connected with second reverse checkvalve; The other end of second reverse checkvalve and first reverse checkvalve is connected respectively with the wherein two ends of the second threeway gas connection; The gas outlet of the second threeway gas connection is connected with second solenoid valve; Another outlet of second solenoid valve is connected with the 3rd threeway gas connection, and the other end gas outlet of high temperature stainless steel pneumatic valve is connected with first solenoid valve, and the other end of second solenoid valve is connected with the 3rd threeway gas connection; The bottom of the 3rd threeway gas connection is connected with outside blowback heat air source apparatus, through outside blowback heat air source apparatus compressed-air actuated temperature is remained on more than 230 ℃.
Denitration flue gas sampling and pretreatment unit adopt from the gas circuit of sampling gas outlet, heating and filtering chamber to ammonium salt washer bottle air intake opening flue gas and swathe heater strip and realize omnidistance heat tracing, guarantee that flue-gas temperature is more than 230 ℃.
3. beneficial effect
Denitration flue gas sampling of the present invention and pretreatment unit are preventing that flue gas condensing, ammonium salt crystallization, ammonium salt from cleaning and two-way has been obtained beneficial effect on the spot aspect the pulse backblowing:
(1) prevents flue gas condensing and ammonium salt crystallization: through the heat tracing unit is set; Promptly adopt the mode of twining heater strip to realize heat tracing from air inlet to ammonium salt washer bottle loam cake gas circuit to flue gas; The washer bottle loam cake adopts insulation material; Prevent because of the low condensation of cigarette temperature drop, cause in pipeline, to form ammonium salt crystallization;
(2) ammonium salt cleaning technique: the nanometer ammonium salt in ammonium salt cleans cleans pearl to enlarge appearance gas contact area, makes unnecessary NH
3With SO
2, SO
3Reaction generates the ammonium salt sedimentation material, and peristaltic pump will dissolve the condensed fluid discharge of ammonium salt, promptly reach the effect of gas-water separation, also guarantee to remove fully the NH in the gas
3, prevent that upstream device is produced burn into to be stopped up;
(3) ammonium salt washer bottle reasonable technology structure is guaranteed impermeability more easily, and it is simple, convenient that while ammonium salt washer bottle and nanometer ammonium salt clean the pearl cleaning, recyclable utilization again;
(4) the blowback control module is contained in the chamber outlet of sampling heating and filtering; Regularly the filtrator to sampling inserting tube and appearance gas sampling carries out blowback; While outer setting blowback heat air source apparatus; Prevent that flue dust from stopping up appearance gas sampling inserting tube and filtrator causes the flue gas sampling gas circuit to be stopped up, employing two-way pulse backblowing technology on the spot prevents that high dust from resulting in blockage to sampling heating and filtering unit.
Description of drawings
The workflow schematic diagram of integrated sampling of Fig. 1 and pretreatment unit.
Fig. 2 is denitration flue gas sampling and pretreatment unit workflow schematic diagram.
Fig. 3 is denitration flue gas sampling and pretreatment unit structural representation.
Wherein: 1 sampling heating and filtering chamber; 2 refractory ceramics filtrators; 3 temperature conditioning units; 4 high temperature stainless steel pneumatic valves; 5 first reverse checkvalves; 6 first threeway gas connections; 7 second reverse checkvalves; 8 second threeway gas connections; 9, ammonium salt washer bottle; 10 sampling feeler levers; 11 the 3rd threeway gas connections; 12 peristaltic pumps; 13 first solenoid valves; 14 second solenoid valves; 15 mounting flanges; 16 pairs of dress flanges; 17 sealing surfaces; 18 stainless steel double-screw bolts; The A air intake opening; The B gas outlet; The outlet of C condensate drain; The D compressed air inlet.
Embodiment
A kind of denitration flue gas sampling and pretreatment unit shown in Fig. 2-3 comprise sampling heating and filtering chamber 1, blowback control module; Also comprise the ammonium salt cleaning unit; Wherein the ammonium salt cleaning unit is connected through the gas outlet of pipeline with sampling heating and filtering chamber; Blowback control module one end is connected with the gas outlet in sampling heating and filtering chamber 1, and an exhausr port of sampling 1 gas outlet, heating and filtering chamber and the first threeway gas connection, 6, the first threeway gas connections 6 is connected with first reverse checkvalve, 5 one ends; The first threeway gas connection, 6 one ends are connected with high temperature stainless steel pneumatic valve 4, and high temperature stainless steel pneumatic valve 4 one ends are connected with ammonium salt washer bottle 9; The heating and filtering chamber 1 of wherein sampling shown in Figure 3 comprises sampling feeler lever 10, heating and filtering chamber, temperature conditioning unit 3; Wherein the heating and filtering chamber is made up of heating rod, refractory ceramics filtrator, graphite interlayer, chamber lid, heating aluminium block; It is inner that heating rod is fixed on the heating aluminium block; The refractory ceramics filter bits is inner in the heating and filtering chamber; The heating aluminium block is positioned at heating rod and the refractory ceramics filtrator is outside; The graphite interlayer is between the lid of heating and filtering cavity and chamber, and it is inside and outside that the thermo-sensitive material of temperature conditioning unit 3 and control module lay respectively at the heating and filtering chamber, sampling feeler lever 10 materials employing SS316 (stainless steel 316), SS316L (stainless steel 316L) or SS304 (stainless steel 304) any one.
The ammonium salt cleaning unit comprises ammonium salt washer bottle 9, peristaltic pump 12, air hose and heat tracing unit; Wherein ammonium salt washer bottle air intake opening is provided with the heat tracing unit with the pipeline that the gas outlet in sampling heating and filtering chamber is connected; The heat tracing unit is a heater strip, and heater strip swathes the gas circuit of sampling gas outlet, heating and filtering chamber to ammonium salt washer bottle air intake opening, realizes heat tracing; Ammonium salt washer bottle 9 bottoms link to each other with peristaltic pump 12 1 ends through air hose; Ammonium salt washer bottle 9 sides are provided with side opening, and ammonium salt washer bottle 9 is made up of loam cake and bottle, and loam cake is selected the corrosion-resistant thermal insulation material for use; Inside is equipped with the nanometer ammonium salt and is cleaned pearl, and the washer bottle loam cake adopts anti-corrosive thermal insulation material PFA (teflon alkoxy resin) or PTFE (Chinese is a teflon).The blowback control module comprises high temperature stainless steel pneumatic valve 4, first solenoid valve 13, second solenoid valve 14, the first threeway gas connection 6, the second threeway gas connection 8; The 3rd threeway gas connection 11; First reverse checkvalve, 5, the second reverse checkvalves 7 and blowback heat air source apparatus.
Embodiment 1
In implementation process; Flue gas is through the sampling feeler lever 10 entering sampling heating and filtering chambeies 1 of air intake opening A, and sampling heating and filtering chamber 1 heat tracing remains on about 230 ~ 290 ℃ flue-gas temperature, controls heater strip automatically by temperature conditioning unit 3 when temperature reduces and is heated to steady temperature; Through refractory ceramics filtrator 2 elimination particle diameters greater than impurity such as the particle of 2um, dust; And enter into ammonium salt washer bottle 9 through the first threeway gas connection 6, high temperature stainless steel pneumatic valve 4, and flue gas arrives in the ammonium salt washer bottle 9, and the cigarette temperature is reduced to below 180 degree; Flue gas cleans pearl, NH in the flue gas through the nanometer ammonium salt that accounts for bottle 2/3rds volumes in the bottle
3With SO
2, SO
3Generate stickum NH
4HSO
4, the water-cooled coalescence in the gas is discharged from condensate drain outlet C through peristaltic pump, and gas is discharged through ammonium salt washer bottle 9 side gas outlet B after the pre-service.First solenoid valve 13, second solenoid valve 14 are controlled by external signal; Regularly open blowback; High temperature stainless steel pneumatic valve 4 cut out when first solenoid valve 13 was opened, and the blowback source of the gas gets into by compressed air inlet D is outside through blowback heat air source apparatus, enters into threeway gas connection 8 through second solenoid valve 14; Reverse checkvalve 5 is connected with threeway gas connection 8 respectively with 7; Heated compressed air is passed to refractory ceramics filtrator 2 carry out blowback, impurity such as particle, dust are blown in the air-returen flue, thereby assurance equipment does not result in blockage because of working long hours with sampling heating and filtering chamber 1 inwall.
Embodiment 2
Apparatus structure increases the temperature alarming unit with embodiment 1 at sampling feeler lever probe place; Lost efficacy when adding thermal control units, temperature is lower than when presetting the alarm temperature, starts warning function; Can in time understand equipment running like this, the equipment of preventing breaks down and makes ammonium salt crystallization stop up gas circuit.
Claims (8)
1. denitration flue gas sampling and pretreatment unit; Comprise sampling heating and filtering chamber, blowback control module; It is characterized in that also comprising the ammonium salt cleaning unit; Wherein the ammonium salt cleaning unit is connected through the gas outlet of pipeline with sampling heating and filtering chamber, and blowback control module one end is connected with the gas outlet in sampling heating and filtering chamber.
2. according to said denitration flue gas sampling of claim 1 and pretreatment unit; It is characterized in that; Said sampling heating and filtering chamber comprises sampling feeler lever, heating and filtering chamber, temperature conditioning unit, and wherein the heating and filtering chamber comprises heating rod, refractory ceramics filtrator, graphite interlayer, chamber lid, heating aluminium block, and it is inner that heating rod is fixed on the heating aluminium block; The refractory ceramics filter bits is inner in the heating and filtering chamber; The heating aluminium block is positioned at heating rod and the refractory ceramics filtrator is outside, and the graphite interlayer is between heating and filtering cavity and chamber lid, and it is inside and outside that the thermo-sensitive material of temperature conditioning unit and control module lay respectively at the heating and filtering chamber.
3. according to said denitration flue gas sampling of claim 1 and pretreatment unit; It is characterized in that; Said ammonium salt cleaning unit comprises ammonium salt washer bottle, peristaltic pump, air hose and heat tracing unit; Wherein on ammonium salt washer bottle air intake opening and the pipeline that the gas outlet in sampling heating and filtering chamber is connected the heat tracing unit is set, said ammonium salt washer bottle bottom links to each other with peristaltic pump one end through air hose.
4. according to said denitration flue gas sampling of claim 1 and pretreatment unit; It is characterized in that; Said blowback control module comprises high temperature stainless steel pneumatic valve (4), first solenoid valve (13), second solenoid valve (14), the first threeway gas connection (6), the second threeway gas connection (8); The 3rd threeway gas connection (11), first reverse checkvalve (5), second reverse checkvalve (7) and blowback heat air source apparatus; An exhausr port of the first threeway gas connection (6) links to each other with first reverse checkvalve (5); First another exhausr port of threeway gas connection (6) links to each other with high temperature stainless steel pneumatic valve (4); The gas outlet of high temperature stainless steel pneumatic valve (4) is connected with ammonium salt washer bottle (9) through pipeline; Heating and filtering chamber (1) is connected with second reverse checkvalve (7); The other end of second reverse checkvalve (7) and first reverse checkvalve (5) is connected respectively with the wherein two ends of the second threeway gas connection (8); The gas outlet of the second threeway gas connection (8) is connected with second solenoid valve (14), and another outlet of second solenoid valve (14) is connected with the 3rd threeway gas connection (11), and the other end gas outlet of high temperature stainless steel pneumatic valve (4) is connected with first solenoid valve (13); The other end of first solenoid valve (13) is connected with the 3rd threeway gas connection (11), and the bottom of the 3rd threeway gas connection (11) is connected with outside blowback heat air source apparatus.
5. according to said denitration flue gas sampling of claim 2 and pretreatment unit, it is characterized in that said sampling feeler lever material is the high temperature resistant material of corrosion resistant.
6. according to said denitration flue gas sampling of claim 3 and pretreatment unit, it is characterized in that said ammonium salt washer bottle is made up of loam cake and bottle, ammonium salt washer bottle side is provided with side opening, and loam cake is selected the corrosion-resistant thermal insulation material for use, and inside is equipped with the nanometer ammonium salt and is cleaned pearl.
7. according to said denitration flue gas sampling of claim 3 and pretreatment unit, it is characterized in that said heat tracing unit is a heater strip, heater strip swathes the gas circuit of sampling gas outlet, heating and filtering chamber to ammonium salt washer bottle air intake opening.
8. according to claim 2 or 5 said denitration flue gas sampling and pretreatment units, it is characterized in that the probe place of said sampling feeler lever increases the temperature alarming unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205588492U CN202382991U (en) | 2011-12-28 | 2011-12-28 | Denitrification flue gas sampling and pretreatment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205588492U CN202382991U (en) | 2011-12-28 | 2011-12-28 | Denitrification flue gas sampling and pretreatment device |
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| Publication Number | Publication Date |
|---|---|
| CN202382991U true CN202382991U (en) | 2012-08-15 |
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ID=46631486
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205588492U Expired - Fee Related CN202382991U (en) | 2011-12-28 | 2011-12-28 | Denitrification flue gas sampling and pretreatment device |
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| Country | Link |
|---|---|
| CN (1) | CN202382991U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564810A (en) * | 2011-12-28 | 2012-07-11 | 南京埃森环境技术有限公司 | Denitrated flue gas sampling and pretreatment device |
| CN109856335A (en) * | 2019-02-13 | 2019-06-07 | 江苏旭龙环境科技有限公司 | A kind of anti-corrosion pretreatment system and application method |
-
2011
- 2011-12-28 CN CN2011205588492U patent/CN202382991U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564810A (en) * | 2011-12-28 | 2012-07-11 | 南京埃森环境技术有限公司 | Denitrated flue gas sampling and pretreatment device |
| CN102564810B (en) * | 2011-12-28 | 2014-05-21 | 南京埃森环境技术有限公司 | Denitrated flue gas sampling and pretreatment device |
| CN109856335A (en) * | 2019-02-13 | 2019-06-07 | 江苏旭龙环境科技有限公司 | A kind of anti-corrosion pretreatment system and application method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20141228 |
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