CN204461867U - A kind of low-concentration flue gas detects pre-service de-watering apparatus and flue gas inspection application system thereof - Google Patents
A kind of low-concentration flue gas detects pre-service de-watering apparatus and flue gas inspection application system thereof Download PDFInfo
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- CN204461867U CN204461867U CN201520191706.0U CN201520191706U CN204461867U CN 204461867 U CN204461867 U CN 204461867U CN 201520191706 U CN201520191706 U CN 201520191706U CN 204461867 U CN204461867 U CN 204461867U
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Abstract
The utility model discloses a kind of low-concentration flue gas and detect pre-service de-watering apparatus and flue gas inspection application system thereof, belong to flue gas inspection field.Device comprises stopple coupon, pretreatment unit and heater wire, pretreatment unit comprises and adds acid unit and condensing unit, wherein add acid unit to form by holding the container of acid solution, air circulation pipe, T-valve and pump, pump pumps into acid solution in the pipeline leading to condensing unit, holds the container of acid solution and is connected by pipeline with between pump; Be connected by pipeline between pump with T-valve, pipeline is wound around heater strip and heats, and the pipeline between acid adding entrance to condenser inlet is heated by heater strip.By said apparatus and system and method, realize, without losing or losing acid gas components less, realizing more accurately detecting low-concentration flue gas.
Description
Technical field
The utility model relates to flue gas inspection field, particularly relates to a kind of low-concentration flue gas and detects pre-service de-watering apparatus and flue gas inspection application system thereof.
Background technology
The discharge of pollutant sources flue gases such as fuel-burning power plant, chemical plant and cement mill are strictly monitored as important pollution source, and the parameter such as kind, concentration, total amount of discharge of pollutant sources is obtained by various flue gas analysis systematic survey.But the flue gas that pollution source directly discharge is usually containing a large amount of dust, moisture etc., the infringements such as burn into blocking can be caused to surveying instrument, therefore before use surveying instrument detects, need that flue gas is directly discharged to pollution source and carry out pre-service, comprise dedusting and dewater, generally carry out dedusting by filter screen or ceramic element, by condenser gaseous state moisture be condensed into liquid state and get rid of.
Dewatered by conventional condenser and there will be a problem: containing a large amount of acidic materials in flue gas, such as SO
2, NO, NO
2deng, these acidic materials are all soluble in water, and namely pollution source flue gas, by condenser removal process, the situation that sour gas is pulled away together with water can occur, and causes SO
2, NO, NO
2etc. the loss of gas composition, affect the accuracy of final gas concentration and total amount result.When concentration of flue gas pollutants is higher, after gas is water-soluble, cause the deviation of result to be usually less than 2%, therefore in common flue gas monitoring equipment, this phenomenon is ignored.
But this phenomenon then becomes when low-concentration flue gas discharges and can not be ignored, along with environmental emission standard is more and more stricter, pollution source thing concentration of emission is more and more lower, and detection difficulty increases, and the loss of component is more serious for the impact of result precision, such as, at SO
2concentration of emission is less than 100mg/m
3time, the deviation that this component is lost can be greater than 5%.Particularly after the power plant emission standard enforcement on July 1st, 2014 that China is new, power plant emission implements strict ultra-low limit discharge, i.e. flue dust limit value 5mg/m
3, sulphuric dioxide limit value 35mg/m
3, oxides of nitrogen limit value 50mg/m
3, the impact of the water-soluble loss of gas composition is even more serious, higher to the requirement detected, higher to the equipment requirement of existing detection.
China Patent No.: 201410309049.5, patent name: " a kind of pollution source sulfur dioxide (SO2) emissions on-line monitoring system and method ", provide a kind of pollution source sulfur dioxide (SO2) emissions on-line monitoring system and method, described monitoring system comprises pretreatment unit, heater block, condensing unit and pick-up unit; Described monitoring system comprises further: injection device, and described injection device is arranged on the pipeline between described pretreatment unit and condensing unit, for being in the phosphoric acid between 1-25% to implantation concentration in described pipeline.The beneficial effect done like this is: the water of separating out in flue gas can enter in low concentration phosphoric acid, and the sulphuric dioxide that can not absorb in flue gas, sulphuric dioxide also can not be dissolved in phosphoric acid, thus ensure that the accuracy that sulfur dioxide in flue gas is monitored, be applicable to the Measurement accuracy of low-concentration sulfur dioxide under high humidity environment.Although the phosphoric acid of low concentration can suppress SO
2be dissolved in water, but limited efficiency, first because the phosphoric acid of 25% is also far from reaching the saturation degree of phosphoric acid, namely can also continue dissolving acid in low concentration phosphoric acid, a small amount of sour gas still can be caused to lose.This art solutions does not control for acid adding temperature simultaneously, and acid adding temperature will affect greatly measures component Loss Rate.
Utility model content
1. the utility model technical matters that will solve
The problem that the utility model is lost in order to contaminated solution source flue gas inspection preprocessing process acid gas components, a kind of low-concentration flue gas is provided to detect pre-service de-watering apparatus and flue gas inspection application system thereof, by said apparatus and method, realize without losing or losing acid gas components less, realize more accurately detecting low-concentration flue gas inspection.
2. technical scheme
Inventive principle:
SO
2, NO
2, the acidic materials such as NO dissolve in water, and namely following chemical reaction occurs:
3NO
2+H
2O＝H
++NO
3 —+NO ②
4NO+3O
2+2H
2O＝4H
++4NO
3 —③
According to the principle of chemical equilibrium, if add acid in water, i.e. H
+, then the chemical equilibrium of reaction 1,2,3 above-mentioned can be made to be moved to the left, namely to reach and suppress SO
2, NO, NO
2deng the object of acidic materials hydrolysis.Therefore, before flue gas enters condenser, in flue gas, inject acid solution, make the water of condensation within the condenser in acid, suppress SO
2, NO, NO
2deng the hydrolysis of acidic materials.
A kind of low-concentration flue gas detects pre-service de-watering apparatus, comprise stopple coupon, pretreatment unit and heater wire, described pretreatment unit comprises and adds acid unit and condensing unit, wherein add acid unit to form by holding the container of acid solution, air circulation pipe, T-valve and pump, pump pumps into acid solution in the pipeline leading to condensing unit, condensing unit is condenser, connected by pipeline between above-mentioned components and parts, hold the container of acid solution to be connected by pipeline with between pump, pipe material is the acid corrosion-resistant materials such as PTFE; Be connected by pipeline between pump with T-valve, pipeline is wound around heater strip and heats, and control temperature scope is 70-100 DEG C, and pipe material is acid corrosion-resistant, the exotic materials such as PTFE.Pipeline between acid adding entrance to condenser inlet is heated by heater strip, and by temperature conditioning unit control temperature at 70-100 DEG C, pipe material is acid corrosion-resistant, the exotic materials such as PTFE.
In the acid adding pipeline adding acid unit, add flowmeter control acid adding speed.
Described condenser has emptying pipeline, discharges aqueous water.
A kind of flue gas inspection application system, comprise above low-concentration flue gas and detect pre-service de-watering apparatus, also comprise analyser and sampling unit, wherein sampling unit control temperature is 100-240 DEG C, by temperature conditioning unit control temperature; Wherein sampling unit is connected by pipeline with pretreatment unit, and pipeline is wound around heater strip and heats, and control temperature scope is 100-240 DEG C, and by temperature conditioning unit control temperature, pipe material is acid corrosion-resistant, the exotic materials such as PTFE; Pretreatment unit is connected by pipeline with analyser.
Described sampling unit, includes stopple coupon, and stopple coupon is provided with filtrator.
Low-concentration flue gas detects pre-service water-eliminating method, the steps include:
(1) flue gas enters stopple coupon from flue, comprises filtrator in stopple coupon, filters out bulky grain flue dust;
(2) before flue gas enters condenser, in water back and condenser junction, introduce acid solution, acid solution enters condenser together with flue gas through water back, and after condensation dewaters, flue gas enters analyser through gas line, analyzes SO
2, NO, NO
2etc. the concentration of contaminant component, then emptying.
The wherein introducing temperature range 70-100 DEG C of acid solution, temperature is too low, and water vapor easily condenses into aqueous water, and be detained in the duct, temperature is too high, and too high to pipeline heat resistant requirements, cost is higher.The connecting tube of pump and T-valve heats by being wound around heater strip, T-valve and condenser connecting tube heat by being wound around heater strip, carry out temperature control to above two place's pipelines and T-valve by temperature conditioning unit, temperature controlling range is 70-100 DEG C.
The concentration range of described introducing acid solution is 1%-85% (mass percent), and be preferably 25%-85% (mass percent), concentration is too low, suppresses the poor effect of gas dissolution; Excessive concentration, part acid liquid viscosity becomes large, such as phosphoric acid, pumps into flow difficulties after pipeline, and requires too high to the acid resistance of pipeline, increase cost.
Acid solution can be perchloric acid, hydroiodic acid, sulfuric acid, hydrobromic acid, hydrochloric acid, nitric acid, acid iodide, oxalic acid, sulphurous acid, phosphoric acid, pyruvic acid, carbonic acid, nitrous acid, citric acid, hydrofluorite, formic acid, lactic acid, benzoic acid, acrylic acid, acetic acid, propionic acid, stearic acid, hydrosulphuric acid or hypochlorous acid, or the mixed solution of two or more acid, preferably phosphoric acid.
3. beneficial effect:
(1) the utility model is by before dewatering at flue gas pre-service condenser, introducing acid solution, reducing or eliminating SO in condenser removal process by adding acid unit
2, NO, NO
2deng the quantity of gas dissolution in aqueous water, reduce the component Loss Rate that flue gas is measured.
(2) the utility model passes through for the temperature control 70-100 DEG C added in acid unit between pump to T-valve, ensure that acid solution is incorporated in flue gas pre-service pipeline in a gaseous form, avoid water vapor to condense into aqueous water, be detained in the duct, pipeline is caused damage.
(3) the utility model is by the optimization to acid strength, improves and suppresses SO
2, NO, NO
2deng the effect of gas dissolution in aqueous water, avoid excessive concentration, part acid liquid viscosity becomes large, such as phosphoric acid simultaneously, pumps into flow difficulties after pipeline, and requires too high to the acid resistance of pipeline, increase cost.
(4) the utility model is by for the temperature control 70-100 DEG C added in temperature control 100-240 DEG C of sampling unit, sampling unit and pretreatment unit associated line, pretreatment unit between the T-valve of acid unit and condenser, the moisture in flue gas is avoided to condense into aqueous water in the above process, be detained in the duct, pipeline is caused damage; Avoid condensate water to take away SO in flue gas simultaneously
2, NO, NO
2deng gas, the component in causing flue gas to measure is lost.
Accompanying drawing illustrates:
Fig. 1 is acid adding cell schematics of the present utility model.
Fig. 2 is that flue gas inspection condensation of the present utility model dewaters process flow diagram.
Fig. 3 is pollution source fume emission detection architecture figure in embodiment 1.
Fig. 4 is that low-concentration flue gas detects pre-service de-watering apparatus structural representation.
Mark in figure: 1 for holding acid liquor container, 2 is air circulation pipe, and 3 is pump, and 4 is flowmeter, and 5 is T-valve, and 6 is heater strip, and 8 is stopple coupon, and 9 is pipeline, and 10 is pretreatment unit, and 11 is condenser, and 12 is analyser.
Embodiment
Embodiment 1
As shown in Figure 4: a kind of low-concentration flue gas detects pre-service de-watering apparatus, comprise stopple coupon 8, pretreatment unit 10 and heater wire, described pretreatment unit 10 comprises and adds acid unit and condensing unit, as shown in Figure 1: wherein add acid unit and form by holding the container 1 of acid solution, air circulation pipe 2, T-valve 5 and pump 3, pump 3 pumps into acid solution in the pipeline leading to condensing unit, condensing unit is condenser 11, connected by pipeline 9 between above-mentioned components and parts, hold the container of acid solution to be connected by pipeline with between pump, pipe material is the acid corrosion-resistant materials such as PTFE; Be connected by pipeline between pump with T-valve, pipeline is wound around heater strip 6 and heats, and control temperature scope is 70-100 DEG C, and pipe material is acid corrosion-resistant, the exotic materials such as PTFE.Pipeline between acid adding entrance to condenser inlet is heated by heater strip, and by temperature conditioning unit control temperature at 70-100 DEG C, pipe material is acid corrosion-resistant, the exotic materials such as PTFE.As shown in Figure 1, flowmeter 4 is set in the acid adding pipeline adding acid unit and controls acid adding speed.Described condenser 11 has emptying pipeline, discharges aqueous water.
As shown in Figure 3: a kind of flue gas inspection application system, comprise above low-concentration flue gas and detect pre-service de-watering apparatus, also comprise analyser 12 and sampling unit, wherein sampling unit control temperature is 100-240 DEG C, by temperature conditioning unit control temperature; Wherein sampling unit is connected by pipeline 9 with pretreatment unit 10, and pipeline 9 surrounding is wound around heater strip and heats, and control temperature scope is 100-240 DEG C, and by temperature conditioning unit control temperature, pipe material is acid corrosion-resistant, the exotic materials such as PTFE; Pretreatment unit 10 is connected by pipeline with analyser 12.
Described sampling unit, includes stopple coupon 8, and stopple coupon 8 is provided with filtrator.
As shown in Figure 2: flue gas is from flue, through stopple coupon, comprise filtrator in stopple coupon, filter out bulky grain flue dust, then enter condenser through water back, in water back and condenser junction, use T-valve to introduce the phosphoric acid solution of 85% (mass percent), phosphoric acid solution enters the condenser pipe of condensation, after condensation dewaters together with flue gas, flue gas enters gas analyzer through gas line, analyzes SO
2, NO, NO
2etc. the concentration of gas composition.
Be heated to 80 DEG C at pump and T-valve pipeline, T-valve place is heated to 80 DEG C, and T-valve and condenser junction are heated to 80 DEG C.
Verify above method gas composition Loss Rate, method is as follows:
SO is led to stopple coupon
2, NO, NO
2content is 50mg/m
3calibrating gas, SO in the gas analyzer of front and back opened by record T-valve
2the reading of concentration, data are as follows:
Can see, during acid filling, three kinds of gas composition Loss Rates are less than 0.2mg/m
3(standard value deducts measured value), and after stopping acid filling, three kinds of gas composition Loss Rates increase, and are 2 ~ 5mg/m
3, and cyclic fluctuation.
Embodiment 2
Device and system, with embodiment 1.Flue gas is from flue, through stopple coupon, comprise filtrator in stopple coupon, filter out bulky grain flue dust, then enter condenser through water back, in water back and condenser junction, use T-valve to inject the phosphoric acid solution of 30% (mass percent), phosphoric acid solution enters the condenser pipe of condensation, after condensation dewaters together with flue gas, flue gas enters gas analyzer through gas line, analyzes SO
2, NO, NO
2etc. the concentration of gas composition.
Be heated to 100 DEG C at pump and T-valve pipeline, T-valve place is heated to 100 DEG C, and T-valve and condenser junction are heated to 100 DEG C.
Verify above method gas composition Loss Rate, method is as follows:
SO is led to stopple coupon
2, NO, NO
2content is 50mg/m
3calibrating gas, SO in the gas analyzer of front and back opened by record T-valve
2the reading of concentration, data are as follows:
Embodiment 3
Device and system, with embodiment 1.Flue gas is from flue, through stopple coupon, comprise filtrator in stopple coupon, filter out bulky grain flue dust, then enter condenser through water back, in water back and condenser junction, use T-valve to inject the phosphoric acid solution of 1% (mass percent), phosphoric acid solution enters the condenser pipe of condensation, after condensation dewaters together with flue gas, flue gas enters gas analyzer through gas line, analyzes SO
2, NO, NO
2etc. the concentration of gas composition.
Be heated to 70 DEG C at pump and T-valve pipeline, T-valve place is heated to 70 DEG C, and T-valve and condenser junction are heated to 70 DEG C.
Verify above method gas composition Loss Rate, method is as follows:
SO is led to stopple coupon
2, NO, NO
2content is 50mg/m
3calibrating gas, SO in the gas analyzer of front and back opened by record T-valve
2the reading of concentration, data are as follows:
Embodiment 4-20
Device and system, with embodiment 1.Flue gas is from flue, through stopple coupon, comprise filtrator in stopple coupon, filter out bulky grain flue dust, then enter condenser through water back, in water back and condenser junction, use T-valve to introduce the B solution (B solution kind is in table 1) that concentration is A (A value is in table 1), phosphoric acid solution enters the condenser pipe of condensation, after condensation dewaters together with flue gas, flue gas enters gas analyzer through gas line, analyzes SO
2, NO, NO
2etc. the concentration of gas composition.
Be heated to 90 DEG C at pump and T-valve pipeline, T-valve place is heated to 90 DEG C, and T-valve and condenser junction are heated to 90 DEG C.
Verify above method gas composition Loss Rate, method is as follows:
SO is led to stopple coupon
2content is 50mg/m
3calibrating gas, SO in the gas analyzer of front and back opened by record T-valve
2the reading of concentration, test findings is in table 1
Table 1
The component Loss Rates such as embodiment 1,2,4,5,7,8,9 are less, because the acid in these 4 groups of embodiments is strong acid or middle strong acid, and concentration is higher, for sour gas SO
2, NO, NO
2dissolution inhibition effect better.Acid adding line temperature controls higher, avoids the condensation of water vapor.The SO of embodiment 6
2test value is greater than actual occurrence value, is because the sulfuric acid adopted is as acid solution, may have the sulfuric acid decomposition of trace and reduce to generate SO
2.
Claims (6)
1. a low-concentration flue gas detects pre-service de-watering apparatus, comprise stopple coupon, pretreatment unit and heater wire, described pretreatment unit comprises and adds acid unit and condensing unit, wherein add acid unit to form by holding the container of acid solution, air circulation pipe, T-valve and pump, pump pumps into acid solution in the pipeline leading to condensing unit, condensing unit is condenser, holds the container of acid solution and is connected by pipeline with between pump; Be connected by pipeline between pump with T-valve, pipeline is wound around heater strip and heats, and control temperature scope is 70-100 DEG C, and the pipeline between acid adding entrance to condenser inlet is heated by heater strip, by temperature conditioning unit control temperature at 70-100 DEG C.
2. a kind of low-concentration flue gas according to claim 1 detects pre-service de-watering apparatus, it is characterized in that, described adding in the acid adding pipeline of acid unit arranges flowmeter and control acid adding speed.
3. a kind of low-concentration flue gas according to claim 2 detects pre-service de-watering apparatus, and it is characterized in that, described condenser has emptying pipeline, discharges aqueous water.
4. a kind of low-concentration flue gas according to claim 1 detects pre-service de-watering apparatus, and it is characterized in that, the material of described pipeline is PTFE acid corrosion-resistant, exotic material.
5. a flue gas inspection application system, it is characterized in that, the low-concentration flue gas comprised described in claim 1-4 any one detects pre-service de-watering apparatus, also comprises analyser and sampling unit, wherein sampling unit control temperature is 100-240 DEG C, by temperature conditioning unit control temperature; Wherein sampling unit is connected by pipeline with pretreatment unit, and pipeline is wound around heater strip and heats, and control temperature scope is 100-240 DEG C, by temperature conditioning unit control temperature; Pretreatment unit is connected by pipeline with analyser.
6. a kind of flue gas inspection application system according to claim 5, it is characterized in that, described sampling unit, includes stopple coupon, and stopple coupon is provided with filtrator.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764649A (en) * | 2015-03-31 | 2015-07-08 | 南京埃森环境技术有限公司 | Low-concentration flue gas detection, pretreatment and water-removal method and device, and flue gas detection application system |
| CN108956879A (en) * | 2018-07-16 | 2018-12-07 | 郑州市通标环境检测有限公司 | A kind of novel high humility low-concentration flue gas detection method |
| CN109323895A (en) * | 2018-10-23 | 2019-02-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Fixed on-line sampling system is always measured containing S for coke-stove gas |
| CN111650332A (en) * | 2020-04-30 | 2020-09-11 | 新疆天熙环保科技有限公司 | Flue gas collection and analysis method |
-
2015
- 2015-03-31 CN CN201520191706.0U patent/CN204461867U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764649A (en) * | 2015-03-31 | 2015-07-08 | 南京埃森环境技术有限公司 | Low-concentration flue gas detection, pretreatment and water-removal method and device, and flue gas detection application system |
| CN104764649B (en) * | 2015-03-31 | 2018-11-06 | 南京埃森环境技术有限公司 | A kind of low-concentration flue gas detection pretreatment water-eliminating method and device and its flue gas inspection application system |
| CN108956879A (en) * | 2018-07-16 | 2018-12-07 | 郑州市通标环境检测有限公司 | A kind of novel high humility low-concentration flue gas detection method |
| CN109323895A (en) * | 2018-10-23 | 2019-02-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Fixed on-line sampling system is always measured containing S for coke-stove gas |
| CN109323895B (en) * | 2018-10-23 | 2021-09-14 | 攀钢集团攀枝花钢铁研究院有限公司 | On-line sampling system for measuring total S content of coke oven gas |
| CN111650332A (en) * | 2020-04-30 | 2020-09-11 | 新疆天熙环保科技有限公司 | Flue gas collection and analysis method |
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Address after: 210042, Jiangsu province Nanjing Xuanwu Avenue 699-8 Xu Zhuang Software Park Development Zone 3, 1 Patentee after: Nanjing Assen Environmental Technology Co., Ltd. Address before: 210023, Jiangsu province Nanjing Xuanwu District Xuanwu Avenue 699-8, Xu Zhuang Software Park, the development of a zone three floors Patentee before: Nanjing Assen Environment Technology Co., Ltd. |