CN208771141U - A kind of detection of hydrogen chloride tail gas absorption strength and automatic cycle absorption plant - Google Patents
A kind of detection of hydrogen chloride tail gas absorption strength and automatic cycle absorption plant Download PDFInfo
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- CN208771141U CN208771141U CN201820749411.4U CN201820749411U CN208771141U CN 208771141 U CN208771141 U CN 208771141U CN 201820749411 U CN201820749411 U CN 201820749411U CN 208771141 U CN208771141 U CN 208771141U
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- hydrogen chloride
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Abstract
The utility model discloses a kind of detection of hydrogen chloride tail gas absorption strength and automatic cycle absorption plants, including the offgas duct communicated with hydrogen chloride tail gas, the offgas duct is connect with first order absorption device, the side of first order absorption device is connected with second level in turn, three-level absorption plant and alkaline absorption plant, the other side is connected with concentrated hydrochloric acid holding vessel, first order absorption device includes the first grade absorption tower connecting with offgas duct, the output end of first grade absorption tower is separately connected a grade hydrochloric acid circulating tank and two-level absorption tower, one grade hydrochloric acid circulating tank is pumped by second circulation and is connect with the input terminal of first grade absorption tower, the second level, the connection type of three-level absorption plant and alkaline absorption plant is identical as first order absorption device.The utility model realizes the automation of hydrogen chloride cyclic absorption device, measurement accuracy is higher by detecting concentration of hydrochloric acid automatically, instrument corrosion resistance is strong, and work efficiency is high, while accurate control hydrogen chloride absorption concentration, reduce the dosage of basic materials, reduces cost of material.
Description
Technical field
The utility model relates to a kind of chlorine hydride tail gas absorbers more particularly to a kind of hydrogen chloride tail gas absorption strength to examine
Survey and automatic cycle absorption plant.
Background technique
Chemical industry uses chlorine for raw material, obtains chloride containing medicine by chlorination reaction because of the needs chemically reacted
Product often generate hydrogen chloride tail gas, are absorbed by water and generate byproduct hydrochloric acid and recycle.Currently, each manufacturer is most
It using water second level or three-level cyclic absorption, is made certain density hydrochloric acid (general control is 32% or so), then by liquid alkaline
With unabsorbed hydrogen chloride gas.Since hydrochloric acid corrosion resistance is strong, using the method for directly measuring concentration of hydrochloric acid, detecting element two
It just needs to change within 3 years.Manufacturer uses manual method to the judgement of hydrogen chloride tail gas degree of absorption mostly at present, rule of thumb
It determining soak time, manually turns off or on respective pump and valve, cause hydrogen chloride absorption insufficient, subsequent alkali charge increases, at
Originally increase, and full manual operation, working environment is poor, big to human injury.
Utility model content
Purpose of utility model: the utility model aim is to propose a kind of detection of hydrogen chloride tail gas absorption strength and automatic cycle
Absorption plant is realized that the control of hydrogen chloride tail gas automatic cycle absorbs, is participated in without artificial, the device measurement accuracy is higher, and energy
Effectively reduce basic materials dosage.
Technical solution: the utility model includes the offgas duct communicated with hydrogen chloride tail gas, the offgas duct and first order absorption
Device connection, the side of the first order absorption device are connected with sponge oil unit, three-level absorption plant and alkalinity in turn and absorb
Device, the other side are connected with concentrated hydrochloric acid holding vessel；The first order absorption device includes the first grade absorption tower connecting with offgas duct,
The output end of first grade absorption tower is separately connected a grade hydrochloric acid circulating tank and two-level absorption tower, and a grade hydrochloric acid circulating tank passes through
Second circulation pump is connect with the input terminal of first grade absorption tower, and differential manometer, thermometer and the are also connected on a grade hydrochloric acid circulating tank
Two liquidometers.
The differential manometer uses high accuracy number differential manometer, has one layer of isolation film outside detection diaphragm.
The thermometer uses metal platinum resistance, and metal detection part from plastics casing is isolated with hydrochloric acid.
The sponge oil unit includes two-level absorption tower, and the output end of the two-level absorption tower is separately connected second level salt
Sour circulating tank and three-level absorption tower, the two grade hydrochloric acid circulating tanks are connected by the input terminal of the 4th circulating pump and two-level absorption tower
It connects, is connected with third liquid level gauge on the two grade hydrochloric acid circulating tanks.
The three-level absorption plant includes three-level absorption tower, and the output end on the three-level absorption tower is separately connected three-level salt
Sour circulating tank and alkaline absorption tower, the three grade hydrochloric acid circulating tanks are connected by the 6th circulating pump and the input terminal on three-level absorption tower
It connects.
It is connected with the 4th liquidometer on the three grade hydrochloric acid circulating tanks, and water pipe is connected by the 7th circulating pump.
The output end on the alkaline absorption tower connects alkaline circulating tank, and the alkalinity circulating tank is connected by the 8th circulating pump
The input terminal for connecing alkaline absorption tower connects waste pipe by the 9th circulating pump.
The 5th liquidometer and pH meter are connected on the alkaline circulating tank.
It is connected with first liquid level gauge on the concentrated hydrochloric acid holding vessel, and passes through first circulation pump and a grade hydrochloric acid circulating tank
Connection.
The utility model has the advantages that the precision of the utility model measurement concentration of hydrochloric acid is higher, measuring instrumentss corrosion resistance is strong, service life
It is long, by automatic real-time detection absorption by Hydrochloric Acid concentration, the automation of hydrogen chloride cyclic absorption device is realized, improves work effect
Rate reduces human cost；Accurate control hydrogen chloride absorption concentration simultaneously, reduces the dosage of basic materials, reduces cost of material.
Detailed description of the invention
Fig. 1 is the automation absorption plant schematic diagram of the utility model；
Fig. 2 is control device schematic diagram of the invention；
Fig. 3 is the control program flow diagram of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, the utility model includes the offgas duct 1 communicated with hydrogen chloride tail gas, offgas duct 1 and first order absorption are filled
Connection is set, the side of first order absorption device is connected with sponge oil unit, three-level absorption plant and alkaline absorption plant in turn, separately
Side is connected with concentrated hydrochloric acid holding vessel 6.First order absorption device includes the first grade absorption tower 2 connecting with offgas duct 1, first grade absorption tower
2 output end is separately connected a grade hydrochloric acid circulating tank 7 and two-level absorption tower 3, and a grade hydrochloric acid circulating tank 7 is pumped by second circulation
12 connect with the input terminal of first grade absorption tower 2.Differential manometer 21, thermometer 27 and the second liquid are connected on one grade hydrochloric acid circulating tank 7
Position meter 23, differential manometer 21 use high accuracy number differential manometer, and precision is ± 0.05%, in order to improve measurement accuracy, using monopole
Type, the digital pressure gauge that range is 15mbr, manufacturer can calibrated span and polarity as needed, the measurement accuracy of concentration of hydrochloric acid can
Up to ± 1%.Differential manometer 21, which detects, one layer of sealing diaphragm i.e. isolation film outside diaphragm, guarantee that detection lug does not connect directly with hydrochloric acid
Touching improves corrosion resistance, effectively increases the functional reliability and its service life of differential manometer 21.
Sponge oil unit includes two-level absorption tower 3, and the output end of two-level absorption tower 3 is separately connected two grade hydrochloric acid circulating tanks
8 are connect by the 4th circulating pump 14 with the input terminal of two-level absorption tower 3 with three-level absorption tower 4, two grade hydrochloric acid circulating tanks 8, second level
Third liquid level gauge 24 is also connected on hydrochloric acid circulating tank 8.
Three-level absorption plant includes three-level absorption tower 4, and the output end on three-level absorption tower 4 is separately connected three grade hydrochloric acid circulating tanks
9 are connect by the 6th circulating pump 16 with the input terminal on three-level absorption tower 4 with alkaline absorption tower 5, three grade hydrochloric acid circulating tanks 9, three-level
It is also connected with the 4th liquidometer 25 on hydrochloric acid circulating tank 9, and water pipe 20 is connected by the 7th circulating pump 17.
The output end on alkaline absorption tower 5 connects alkaline circulating tank 10, and alkaline circulating tank 10 is connected by the 8th circulating pump 18
The input terminal on alkaline absorption tower 5 connects waste pipe 28 by the 9th circulating pump 19, is also connected with the 5th liquid on alkaline circulating tank 10
Position meter 26 and pH meter 29.
It is connected with first liquid level gauge 22 on concentrated hydrochloric acid holding vessel 6, and passes through first circulation pump 11 and a grade hydrochloric acid circulating tank
7 connections.
Be illustrated in figure 2 control principle drawing of the invention, differential manometer 21, thermometer 27, pH meter 29 and liquidometer with control
Device 30 processed is connected, and the numerical value of each meter is read by controller 30.
In use, hydrogen chloride tail gas enters first grade absorption tower 2 by offgas duct 1 from top to bottom, a grade hydrochloric acid circulating tank 7 is through the
Hydrochloric acid is sent into first grade absorption tower 2 by two circulating pumps 12, is come into full contact with hydrogen chloride gas, the hydrochloric acid reflux of generation enters a grade hydrochloric acid
In circulating tank 7；Unabsorbed hydrogen chloride flows into two-level absorption tower 3 by pipeline, with the second level sent through the 4th circulating pump 14
Hydrochloric acid contact in circulating tank 8, the hydrochloric acid reflux of generation enter secondary cycle tank 8；Unabsorbed hydrogen chloride gas passes through pipeline
Three-level absorption tower 4 is flowed into, is contacted with the hydrochloric acid in the three-level circulating tank 9 sent through the 6th circulating pump 16, the dilute hydrochloric acid of generation returns
Flow into three-level circulating tank 9；The unabsorbed hydrogen chloride tail gas of three-level flows into alkaline absorption tower 5 through conduit, recycles with by the 8th
The alkaline solution in alkaline circulating tank 10 that pump 18 passes through carries out circulation neutralization, by pump 19 after sufficiently neutralizing, through waste pipe 28
It send to waste water system, the liquid level in each tank body can be obtained by corresponding liquidometer and rationally control the liquid level height in tank
Degree.
Detection method includes the following steps for concentration of hydrochloric acid:
1) proportional relationship according to existing for hydrochloric acid pressure and density, calculates corresponding hydrochloric acid density, hydrochloric acid density
Calculation formula are as follows:
Δ p=h ρ g
Wherein, Δ p is hydrochloric acid liquid level pressure difference, and h is liquid level in tank, and ρ is hydrochloric acid density.
2) at corresponding temperature and density, enquiry form calculates corresponding concentration of hydrochloric acid, under corresponding temperature, when
When density is not corresponding density in table, concentration of hydrochloric acid is determined using interpolation method:
Wherein, v is current calculating concentration, vi+1For ρi+1Corresponding concentration, viFor ρ in tableiCorresponding concentration, ρi+1, ρiFor
Two density being close in table with ρ.
The fluid pressure in a grade hydrochloric acid circulating tank 7 is measured with differential manometer 21, meanwhile, liquid temperature is measured with thermometer 27
Degree, differential manometer 21 use high accuracy number differential manometer, and precision is ± 0.05%, in order to improve measurement accuracy, using monopole type, amount
Journey is the digital pressure gauge of 15mbr, manufacturer can calibrated span and polarity as needed, according to respective algorithms, the survey of concentration of hydrochloric acid
Accuracy of measurement reachable ± 1%.Differential manometer 21, which detects outside diaphragm, one layer of sealing diaphragm i.e. isolation film, guarantee detection lug not with hydrochloric acid
It directly contacts, improves corrosion resistance, effectively increase the functional reliability and its service life of differential manometer 21, thermometer 27 uses
Metal platinum resistance, metal detection part from plastics casing are isolated with hydrochloric acid, differential manometer 21 and thermometer 27 with controller 30
It is connected, as shown in Fig. 2, reading the pressure difference of differential manometer 21 and the temperature value of thermometer 27 by controller 30.
As shown in figure 3, detecting the pressure difference that certain altitude liquid is formed using differential manometer 21, and conversed according to above-mentioned algorithm
Concentration of hydrochloric acid is compared with the concentration of setting, if reaching the upper limit of setting value, automatically turns on first circulation by concentration of hydrochloric acid
Pump 11, the concentrated hydrochloric acid in a grade hydrochloric acid circulating tank 7 is sent to concentrated hydrochloric acid holding vessel 6, measures level-one salt using second liquid level gauge 23
Liquid level in sour circulating tank 7 closes first circulation pump 11 when liquid level reaches lower limit；Start third circulating pump 13, second level is followed
Dilute hydrochloric acid in ring tank 8 is sent to 7 cyclic absorption of a grade hydrochloric acid circulating tank, is measured a grade hydrochloric acid using second liquid level gauge 23 and is recycled
Liquid level in tank 7 closes third circulating pump 13 when liquid level reaches the upper limit；Start the 5th circulating pump 15 simultaneously, three-level is recycled
Solution in tank 9 send the cyclic absorption into secondary cycle tank 8, measures the liquid level in secondary cycle tank 8 using third liquid level gauge 24,
When liquid level reaches the upper limit, the 5th circulating pump 15 is closed；Start the 7th circulating pump 17 simultaneously, is recycled by water pipe 20 to three-level
Injected clear water in tank 9 measures the liquid level in three-level circulating tank 9 by the 4th liquidometer 25, when liquid level reaches the upper limit, closes the
Seven circulating pumps 17；It is opened using the pH value that pH meter 29 measures liquid in alkaline circulating tank 10 when the pH value of liquid reaches setting value
Dynamic 9th circulating pump 19, the liquid in alkaline circulating tank 10 is sent through waste pipe 28 to waste water system, meanwhile, pass through the 5th liquid level
Meter 26 measures the liquid level in alkaline circulating tank 10, when liquid level reaches lower limit, closes the 9th circulating pump 19, completes a hydrogen chloride
The detection and automation cyclic absorption process of tail gas absorption concentration, open next cyclic absorption process, such Zhou Erfu later
Beginning goes down.Whole process automatic control, prosthetic participate in, and improve the degree of automation and absorption efficiency.
Claims (9)
1. a kind of detection of hydrogen chloride tail gas absorption strength and automatic cycle absorption plant, which is characterized in that including with hydrogen chloride tail
The logical offgas duct (1) of gas phase, the offgas duct (1) connect with first order absorption device, and the side of the first order absorption device is successively
It is connected with sponge oil unit, three-level absorption plant and alkaline absorption plant, the other side is connected with concentrated hydrochloric acid holding vessel (6)；Institute
The first order absorption device stated includes the first grade absorption tower (2) connecting with offgas duct (1), the output end difference of first grade absorption tower (2)
A grade hydrochloric acid circulating tank (7) and two-level absorption tower (3) are connected, a grade hydrochloric acid circulating tank (7) is pumped by second circulation
(12) it is connect with the input terminal of first grade absorption tower (2), is also connected with differential manometer (21), thermometer on a grade hydrochloric acid circulating tank (7)
(27) with second liquid level gauge (23).
2. a kind of hydrogen chloride tail gas absorption strength detection according to claim 1 and automatic cycle absorption plant, feature
It is, the differential manometer (21) uses high accuracy number differential manometer, has one layer of isolation film outside detection diaphragm.
3. a kind of hydrogen chloride tail gas absorption strength detection according to claim 1 and automatic cycle absorption plant, feature
It is, the thermometer (27) uses metal platinum resistance, and metal detection part from plastics casing is isolated with hydrochloric acid.
4. a kind of hydrogen chloride tail gas absorption strength detection according to claim 1 and automatic cycle absorption plant, feature
It is, the sponge oil unit includes two-level absorption tower (3), and the output end of the two-level absorption tower (3) is separately connected two
Grade hydrochloric acid circulating tank (8) and three-level absorption tower (4), the two grade hydrochloric acid circulating tanks (8) pass through the 4th circulating pump (14) and two
The input terminal on grade absorption tower (3) connects, and is also connected with third liquid level gauge (24) on the two grade hydrochloric acid circulating tanks (8).
5. a kind of hydrogen chloride tail gas absorption strength detection according to claim 1 and automatic cycle absorption plant, feature
It is, the three-level absorption plant includes three-level absorption tower (4), and the output end of the three-level absorption tower (4) is separately connected three
Grade hydrochloric acid circulating tank (9) and alkaline absorption tower (5), the three grade hydrochloric acid circulating tanks (9) pass through the 6th circulating pump (16) and three
The input terminal connection on grade absorption tower (4).
6. a kind of hydrogen chloride tail gas absorption strength detection according to claim 5 and automatic cycle absorption plant, feature
It is, the 4th liquidometer (25) is connected on the three grade hydrochloric acid circulating tanks (9), and clear by the connection of the 7th circulating pump (17)
Water pipe (20).
7. a kind of hydrogen chloride tail gas absorption strength detection according to claim 5 and automatic cycle absorption plant, feature
It is, the output end on the alkaline absorption tower (5) connects alkaline circulating tank (10), and the alkalinity circulating tank (10) passes through the 8th
Circulating pump (18) connects the input terminal of alkaline absorption tower (5), connects waste pipe (28) by the 9th circulating pump (19).
8. a kind of hydrogen chloride tail gas absorption strength detection according to claim 7 and automatic cycle absorption plant, feature
It is, is connected with the 5th liquidometer (26) and pH meter (29) on the alkaline circulating tank (10).
9. a kind of hydrogen chloride tail gas absorption strength detection according to claim 1 and automatic cycle absorption plant, feature
It is, is connected with first liquid level gauge (22) on the concentrated hydrochloric acid holding vessel (6), and passes through first circulation pump (11) and level-one salt
Sour circulating tank (7) connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820749411.4U CN208771141U (en) | 2018-05-17 | 2018-05-17 | A kind of detection of hydrogen chloride tail gas absorption strength and automatic cycle absorption plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820749411.4U CN208771141U (en) | 2018-05-17 | 2018-05-17 | A kind of detection of hydrogen chloride tail gas absorption strength and automatic cycle absorption plant |
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| Publication Number | Publication Date |
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| CN208771141U true CN208771141U (en) | 2019-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820749411.4U Active CN208771141U (en) | 2018-05-17 | 2018-05-17 | A kind of detection of hydrogen chloride tail gas absorption strength and automatic cycle absorption plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984855A (en) * | 2021-10-22 | 2022-01-28 | 福建福清核电有限公司 | Method and device for measuring concentration of target gas in radioactive waste gas |
-
2018
- 2018-05-17 CN CN201820749411.4U patent/CN208771141U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984855A (en) * | 2021-10-22 | 2022-01-28 | 福建福清核电有限公司 | Method and device for measuring concentration of target gas in radioactive waste gas |
| CN113984855B (en) * | 2021-10-22 | 2024-01-23 | 福建福清核电有限公司 | Method and device for measuring concentration of target gas in radioactive waste gas |
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