CN104236988A - Ammonia escape analyzer pretreatment device, using method and purposes - Google Patents
Ammonia escape analyzer pretreatment device, using method and purposes Download PDFInfo
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- CN104236988A CN104236988A CN201410536415.0A CN201410536415A CN104236988A CN 104236988 A CN104236988 A CN 104236988A CN 201410536415 A CN201410536415 A CN 201410536415A CN 104236988 A CN104236988 A CN 104236988A
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- reaction chamber
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Abstract
The invention discloses an ammonia escape analyzer pretreatment device. The ammonia escape analyzer pretreatment device comprises a casing, a primary filter, a catalytic reaction chamber and a secondary filter; the primary filter is arranged above one side of the inside of the casing; the primary filter is connected with the catalytic reaction chamber through a pipe; the catalytic reaction chamber is connected with the secondary filter through a pipe; activated coke particles are arranged in the catalytic reaction chamber. The ammonia escape analyzer pretreatment device is combined with the catalytic reaction chamber, the appropriate particle size of activated coke particles are arranged in the catalytic reaction chamber, the catalytic decomposition is performed on ammonium hydrogen sulfate, the liquid ammonium hydrogen sulfate is absorbed, and accordingly the corrosion on detection system instruments is avoided, meanwhile the accuracy of the ammonia detection is improved, and a series of problems caused by the detection result error are solved and meanwhile a heating device is arranged outside the catalytic reaction chamber and accordingly the free water on the surfaces of the activated coke particles can be eliminated and the decomposition of the ammonium hydrogen sulfate can be catalyzed.
Description
Technical field
The present invention relates to a kind of pretreatment unit of the escaping of ammonia analyser, particularly relating to a kind of the escaping of ammonia analyser pretreatment unit, using method and purposes for anticipating ammonium hydrogen sulfate.
Background technology
Discharged nitrous oxides is disturbing the life of people wantonly, in denitrating flue gas process, sprays into ammonia, by NO in flue gas
xbe catalysed and reduced into N
2and H
2o, because the ammonia that sprays into and flue gas can not accomplish complete Homogeneous phase mixing, in some region of reactor, the content of ammonia can be greater than the NO in flue gas
xcontent, so just causes ammonia relative surplus, thus forms the escaping of ammonia.Therefore need to monitor amount of ammonia slip in denitrating flue gas process, for the escaping of ammonia controlling denitrating system provides foundation, should ensure there are enough NH in denitrification process
3injection rate IR and reaction of nitrogen oxides, to reduce nitrogen oxide emission, avoid NH excessive in flue gas again
3escape, excessive NH
3not only can increase corrosion, shorten the SCR catalyst life-span, also can pollute flue dust, increase the deposition of ammonia salt in air preheater, and increase the NH to air
3discharge.
Inevitably the escaping of ammonia can occur in gametic fertility device, the escaping of ammonia monitoring has important effect in environmental protection and technology controlling and process.Often NH is produced in the tested flue in the escaping of ammonia monitoring point
4hSO
4, NH
4hSO
4be droplet when temperature is lower, viscosity is very large and be corrosive, and is bonded on its slide when running into laser gas analyzer optical system, precooling post crystallization is white crystal, the laser optical path sheltering from instrument makes it measure, but also meeting corrosion measurement pond, affect the serviceable life of instrument.
The ammonium salt crystallization condensed in CEMS (flue gas automatic monitoring system), can cause monitoring analysis result to occur error, improves actual desulfurization and denitration efficiency, thus conceals or ignore the secondary pollution problem of ammonium salt crystallization.In addition, ammonium salt crystallization can block sampling line, reduces the condensation efficiency of CEMS condenser, causes CEMS to occur problems.
Summary of the invention
Fundamental purpose of the present invention is, overcome the defect that existing the escaping of ammonia monitoring instrument exists, and a kind of the escaping of ammonia analyser pretreatment unit, using method and purposes are provided, decompose ammonium hydrogen sulfate in advance, thus be more suitable for practicality, and there is the value in industry.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to the escaping of ammonia analyser pretreatment unit that the present invention proposes, include housing, grade one filter, catalytic reaction chamber and secondary filter, grade one filter is provided with above described enclosure interior side, described grade one filter connects described catalytic reaction chamber by pipeline, and described catalytic reaction chamber connects secondary filter by pipeline;
Described catalytic reaction indoor are provided with activated coke particle;
Wherein grade one filter adopts oil-water separation system, the coalescent pack of inner employing stainless steel cloth, housing adopts steel welding tank body, its principle is the combination utilizing whirlwind and stainless steel cloth to catch mist, adopt the mechanism such as directly interception, inertial collision, Blang's diffusion and cohesion, effective dirt, water, the mist of oil removed in pressurized air simultaneously.
Wherein secondary filter adopts swinging oil-water separator, produces the sharply change of the flow direction and speed, then relies on inertia effect, oil droplet large for density ratio pressurized air and water droplet are separated, purified further by gas after pressurized air enters oil-water separator.
Further, aforesaid the escaping of ammonia analyser pretreatment unit, described activated coke grain graininess is 1-6mm, on the one hand due to the existence of activated coke particle, cause gas at the increased retention of catalytic reaction indoor, gaseous sulfuric acid hydrogen ammonium catalytic decomposition under the effect of catalyzer, the NH that temperature is lower on the other hand
4hSO
4become droplet, by activated coke particle entrapment.
Further, aforesaid the escaping of ammonia analyser pretreatment unit, is provided with heating arrangement on described catalytic reaction chamber top, removes by the mode of heating the little water droplet being adsorbed on activated coke particle surface.
Further, aforesaid the escaping of ammonia analyser pretreatment unit, described secondary filter connects laser measurement pond by pipeline after connecting sintering flame-resistant sheet.
Sintering flame-resistant sheet adopts the manufacture of metal sintering porosint, there is even pore distribution, air penetrability is large, the pressure loss is little, intensity is high, thermal conductivity is good, be easy to the good characteristics such as knock down the flame, effectively can shorten the warning reflecting time of fire-retardant explosion isolation device, improve susceptibility and the impact resistance of fire retardant elements, thus greatly improve safe reliability and the serviceable life of device; By the adjustment of aperture and passage length, the fire-retardant flame proof warning requirement of dissimilar air mixture can be met.
Laser measurement pond adopts tunable diode laser absorption spectroscopy technology, is carried out the concentration of mensurated gas composition by analysis light by the Selective absorber of gas.With traditional infrared spectral technique unlike, the spectral line width of spectral line width much smaller than traditional infrared light source of semiconductor laser light resource that its adopts and the broadening of gas absorption spectrum line.Laser linewidth is much smaller than tested gas single line absorption line width, and its frequency modulation (PFM) sweep limit also only comprises tested gas list absorption line, therefore avoids gas cross to disturb, and is current on-line measurement NH
3best-of-breed technology.
Further, aforesaid the escaping of ammonia analyser pretreatment unit, described catalytic reaction chamber case material is stainless steel, teflon, quartz or fiberglass.
The escaping of ammonia analyser pretreatment unit using method, comprises the steps,
1) testing fixture;
2) first heat described catalytic reaction chamber to 140 DEG C before using, be incubated one hour, to remove the free water being adsorbed on activated coke surface;
3) gas is passed into; Open aspiration pump, the processed NH contained
4hSO
4tail gas enters system through aspiration pump, first enters grade one filter, and remove the moisture and bulky grain dust that contain, the gas be filtered enters catalytic reaction chamber, effectively by the NH in flue gas
4hSO
4be detained to catalytic decomposition, NH
4hSO
4under the effect of catalyzer and heating, be decomposed into water, sulphuric dioxide and ammonia, processed gas enters secondary filter in the lump, the moisture of remnants and filtering dust is fallen;
4) last gas enters laser measurement pond and carries out ammonia level detection.
Further, aforesaid the escaping of ammonia analyser pretreatment unit using method, first step heating-up temperature is 140 DEG C, is incubated 1 hour, and it is 220 ~ 270 DEG C that second step continues heating-up temperature, insulation 1-3min.
Further, aforesaid the escaping of ammonia analyser pretreatment unit using method, it is 8L/5min ~ 15L/5min that gas passes into flow velocity, is preferably 10L/5min.
The escaping of ammonia analyser pretreatment unit is used for decomposing ammonium hydrogen sulfate.
By technique scheme, the escaping of ammonia analyser pretreatment unit of the present invention, using method and purposes at least have following advantages:
The escaping of ammonia analyser pretreatment unit of the present invention, in conjunction with catalytic reaction chamber, the activated coke particle of appropriate particle size is set, by ammonium hydrogen sulfate catalytic decomposition, liquid sulfuric acid hydrogen ammonium is absorbed, avoid the corrosion to detection system instrument, improve ammonia simultaneously and detect degree of accuracy, evade the series of problems because testing result error causes; Meanwhile, at the outer setting heating arrangement of catalytic reaction chamber, the free water of activated coke particle surface can be got rid of on the one hand, on the other hand can the decomposition of catalysis ammonium hydrogen sulfate.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, be described in detail as follows below with preferred embodiment of the present invention.
Accompanying drawing explanation
Figure 1 shows that the escaping of ammonia analyser pretreatment unit structural representation of the present invention;
Implication is marked: 1. aspiration pump, 2. grade one filter, 3. catalytic reaction chamber in figure, 4. secondary filter, 5. sinters flame-resistant sheet, 6. laser measurement pond, 7. pipeline, 8. housing, 9. heating arrangement, 11. grade one filter air intake openings, 12. grade one filter gas outlets, 13. catalytic reaction chamber air intake openings, 14. catalytic reaction chamber gas outlets, 15. secondary filter air intake openings, 16. secondary filter gas outlets.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, to the escaping of ammonia analyser pretreatment unit proposed according to the present invention, using method and its embodiment of purposes, feature and effect thereof, be described in detail as follows.
Embodiment 1
Be illustrated in figure 1 the escaping of ammonia analyser pretreatment unit of the present invention, include aspiration pump 1, grade one filter 2, catalytic reaction chamber 3, secondary filter 4, sintering flame-resistant sheet 5, pipeline 7, housing 8 and heating arrangement 9.
Housing 8 is a square structure, and aspiration pump 1 is arranged on side, housing 8 top, and the inner upper left side of housing 8 is provided with grade one filter 2, and aspiration pump 1 gas outlet and grade one filter air intake opening 11 are fixed by the mode of spinning; Grade one filter 2 adopts oil-water separation system, the coalescent pack of inner employing stainless steel cloth, housing adopts steel welding tank body, its principle is the combination utilizing whirlwind and stainless steel cloth to catch mist, adopt the mechanism such as directly interception, inertial collision, Blang's diffusion and cohesion, effective dirt, water, the mist of oil removed in pressurized air simultaneously.
Grade one filter 2 upper right side connects catalytic reaction chamber 3 by pipeline 7, now one end of pipeline 7 is grade one filter gas outlet 12, the other end is catalytic reaction chamber air intake opening 13, pipeline 7 with can for spinning or being fixedly connected with mode between grade one filter gas outlet 12 and catalytic reaction chamber air intake opening 13.Wherein catalytic reaction chamber air intake opening 13 is arranged on the top of catalytic reaction chamber 3, the bottom of catalytic reaction chamber 3 is provided with catalytic reaction chamber gas outlet 14, catalytic reaction chamber gas outlet 14 is connected with secondary filter air intake opening 15 by the serpentine pipeline 7 that is vertically arranged, and connected mode is the same.Wherein secondary filter air intake opening 15 is arranged on the top of secondary filter 4, in the middle part of secondary filter 4, side is provided with secondary filter gas outlet 16, wherein secondary filter adopts swinging oil-water separator, the sharply change of the flow direction and speed is produced after pressurized air enters oil-water separator, rely on inertia effect again, oil droplet large for density ratio pressurized air and water droplet are separated, gas is purified further.
Secondary filter gas outlet 16 connects sintering flame-resistant sheet 5, and sintering flame-resistant sheet 5 other end is connected on laser measurement pond 6 by pipeline 7.Sintering flame-resistant sheet 5 adopts the manufacture of metal sintering porosint, there is even pore distribution, air penetrability is large, the pressure loss is little, intensity is high, thermal conductivity is good, be easy to the good characteristics such as knock down the flame, effectively can shorten the warning reflecting time of fire-retardant explosion isolation device, improve susceptibility and the impact resistance of fire retardant elements, thus greatly improve safe reliability and the serviceable life of device; By the adjustment of aperture and passage length, the fire-retardant flame proof warning requirement of dissimilar air mixture can be met.
Laser measurement pond 6 adopts tunable diode laser absorption spectroscopy technology, is carried out the concentration of mensurated gas composition by analysis light by the Selective absorber of gas.With traditional infrared spectral technique unlike, the spectral line width of spectral line width much smaller than traditional infrared light source of semiconductor laser light resource that its adopts and the broadening of gas absorption spectrum line.Laser linewidth is much smaller than tested gas single line absorption line width, and its frequency modulation (PFM) sweep limit also only comprises tested gas list absorption line, therefore avoids gas cross to disturb, and is current on-line measurement NH
3best-of-breed technology.
Wherein also be provided with heating arrangement 9 in the outside of catalytic reaction chamber 3, case material can select stainless steel, teflon, quartz or fiberglass; Be provided with activated coke particle in catalytic reaction chamber 3, granularity is 1-6mm.
The escaping of ammonia analyser pretreatment unit of the present invention is used for decomposing ammonium hydrogen sulfate, comprises the steps,
1) testing fixture;
2) first heatable catalytic reaction chamber 3 to 140 DEG C before using, is incubated one hour, to remove the free water being adsorbed on activated coke surface, then continues to be heated to 220 ~ 270 DEG C, insulation 1-3min;
3) pass into gas, open aspiration pump 1, passing into flow velocity is 10L/5min, the processed NH contained
4hSO
4tail gas enters system through aspiration pump 1, first enters grade one filter 2, and remove the moisture and bulky grain dust that contain, the gas be filtered enters catalytic reaction chamber 3, effectively by the NH in flue gas
4hSO
4be detained to catalytic decomposition, NH
4hSO
4under the effect of catalyzer and heating, be decomposed into water, sulphuric dioxide and ammonia, processed gas enters secondary filter 4 in the lump, the moisture of remnants and filtering dust is fallen;
4) last gas enters laser measurement pond 6 and carries out ammonia level detection.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (9)
1. a escaping of ammonia analyser pretreatment unit, it is characterized in that, include housing (8), grade one filter (2), catalytic reaction chamber (3) and secondary filter (4), grade one filter (2) is provided with above described housing (8) inner side, described grade one filter (2) connects described catalytic reaction chamber (3) by pipeline (7), and described catalytic reaction chamber (3) connects secondary filter (4) by pipeline (7);
Described catalytic reaction chamber is provided with activated coke particle in (3).
2. the escaping of ammonia analyser pretreatment unit according to claim 1, is characterized in that, described activated coke grain graininess is 1-6mm.
3. the escaping of ammonia analyser pretreatment unit according to claim 1, is characterized in that, described catalytic reaction chamber (3) top is provided with heating arrangement (9).
4. the escaping of ammonia analyser pretreatment unit according to claim 1, is characterized in that, described secondary filter (4) connects sintering flame-resistant sheet (5) and connects laser measurement pond (6) by pipeline (7) afterwards.
5. the escaping of ammonia analyser pretreatment unit according to claim 1, is characterized in that, described catalytic reaction chamber (3) case material is stainless steel, teflon, quartz or fiberglass.
6. a escaping of ammonia analyser pretreatment unit using method, is characterized in that: comprise the steps,
1) testing fixture;
2) heat described catalytic reaction chamber (3) and be incubated;
3) gas is passed into;
4) last gas enters laser measurement pond and carries out ammonia level detection.
7. the escaping of ammonia analyser pretreatment unit using method according to claim 6, it is characterized in that: described catalytic reaction chamber (3) first step heating-up temperature is 140 DEG C, be incubated 1 hour, it is 220 ~ 270 DEG C that second step continues heating-up temperature, insulation 1-3min.
8. the escaping of ammonia analyser pretreatment unit using method according to claim 6, is characterized in that: it is 8L/5min ~ 15L/5min that gas passes into flow velocity.
9. the escaping of ammonia analyser pretreatment unit is used for decomposing ammonium hydrogen sulfate.
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| CN201410536415.0A CN104236988B (en) | 2014-10-11 | 2014-10-11 | The escaping of ammonia analyzer pretreatment unit, application method and purposes |
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| CN104236988B CN104236988B (en) | 2017-06-13 |
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|---|---|---|---|---|
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2014
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Patent Citations (8)
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| CN201449347U (en) * | 2009-09-08 | 2010-05-05 | 西安热工研究院有限公司 | Sleeve type escape ammonia sampling system |
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| CN104236988B (en) | 2017-06-13 |
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