CN105607487A - Solvent recovery cost discharge control device, and method thereof - Google Patents
Solvent recovery cost discharge control device, and method thereof Download PDFInfo
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- CN105607487A CN105607487A CN201610138555.1A CN201610138555A CN105607487A CN 105607487 A CN105607487 A CN 105607487A CN 201610138555 A CN201610138555 A CN 201610138555A CN 105607487 A CN105607487 A CN 105607487A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
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Abstract
The invention provides a solvent recovery cost discharge control device, and a method thereof. The solvent recovery cost discharge control device is characterized in that one end of a solvent absorber is connected with a steam pipeline and a gas mixture inlet pipe; a steam regulating valve is arranged on the steam pipeline; the other end of the solvent absorber is connected with a tail gas discharge pipe and a desorption gas pipeline; the desorption gas pipeline is connected with the input of a condenser; the output of the condenser is connected with a desorption solution pipeline; a solvent density detector is arranged on the desorption solution pipeline; the solvent density detector is connected with an input end of the control device; and the steam regulating valve is connected with an output end of the control device. As the solvent recovery cost discharge control device and the method thereof utilize a scheme that an on-line solvent density detector coordinates with steam flow control, automatic control of tail gas discharge can be realized and the situation that the tail gas is over-discharged can be avoided. By means of establishment of a cost control model, the solvent recovery cost discharge control device and the method thereof can accurately control the solvent and the relationship between the cost of the recovery process and environmental protection, and can realize a optimal production model with overall consideration to both the cost and environmental protection. The solvent recovery cost discharge control device and the method thereof can save the recovery cost on the premise that tail gas discharge meets the environmental protection discharge standard.
Description
Technical field
The present invention relates to the solvent recovery field in acetate fiber production process, particularly a kind of solvent recovery cost emission control system and method.
Background technology
Solvent recovery in acetate fiber production process, concentratedly conventionally comprise: 1, medium absorption, for example, adopt active carbon; 2, desorb, for example, adopt steam; The main process such as 3, condensation, rectifying, concentrate.
In desorption process, need to replace with steam the solvent that medium adsorbs, the consumption of steam is relevant with degree of desorption, consumes steam more, and desorb is more thorough, and exhaust emissions is lower, but cost recovery is higher, and vice versa. Cost recovery, exhaust emissions, steam consume and have formed heterogeneous equilibrium. Wherein any one all can cause uncontrolled situation in simple pursuit, as overemphasizes steam and consume, and likely causes exhaust emissions not meet environmental requirement. And too reduce exhaust emissions, may cause again the significantly rising of cost. How between cost recovery, exhaust emissions and steam consume, to form preferred plan, there is no at present comparatively desirable, to be convenient to practical operation scheme.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of solvent recovery cost emission control system and method, can automatically control the discharge standard of tail gas, meet at exhaust emissions under the prerequisite of environmental emission standard and save cost recovery, or reduce solvent discharge as far as possible under fixing solvent recovery cost condition.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of solvent recovery cost emission control system, solvent adsorption device one end is connected with steam pipework and gaseous mixture inlet pipe, steam pipework is provided with steam control valve, and the other end of solvent adsorption device is connected with tail gas discharging pipe and desorption gas pipeline;
Desorption gas pipeline is connected with the input of condenser, and the output of condenser is connected with stripping liquid pipeline, is provided with solvent density detector on stripping liquid pipeline;
Solvent density detector is connected with the input of control device, and steam control valve is connected with the output of control device.
Described control device is PID control device.
Described steam control valve is degree adjustment valve.
Described solvent density detector is ultrasonic online solvent density detector.
On steam pipework, gaseous mixture inlet pipe, tail gas discharging pipe and desorption gas pipeline, be equipped with valve.
Described solvent adsorption device is multiple, and when one of them is in desorption state, other solvent adsorption device is adsorbed state.
A method that adopts above-mentioned solvent recovery cost emission control system, comprises the following steps:
One,, according to the data of solvent density detector, obtain the concentration data of solvent in stripping liquid;
Two, set up function x=f (y),
In formula, x is steam consumption, and unit is L;
Y is the concentration of solvent in stripping liquid, and unit is mol/kg;
Calculate steam consumption cost B according to steam consumption x;
Three, opening relationships formula A=B+C, constraints is C < D
In formula, A is solvent recovery cost, and unit is unit;
B is steam consumption cost, and unit is unit;
C is tail gas solvent consumption cost, and unit is unit;
Solvent consumption cost when D is tail gas environmental emission standard, unit is unit;
Four, adopt diagram method, ask the minimum of a value of solvent recovery cost A;
By above step, be no more than under the prerequisite of tail gas environmental emission standard, realize at lower cost recovery and the emission control of solvent.
A kind of solvent recovery cost emission control system provided by the invention and method, by adopting the scheme of online solvent density detector coordinating with steam rapid heat cycle flow-control, realize the automatic control of exhaust emissions, avoids the situation that occurs that exhaust emissions exceeds standard. By setting up cost control model, can accurately control solvent, for example relation of recover acetone process cost and environmental protection, realizes the Optimal Production pattern that cost and environmental protection take into account. The solution of the present invention can be saved cost recovery under exhaust emissions meets the prerequisite of environmental emission standard, or under fixing solvent recovery cost condition, reduces the discharge of solvent as far as possible.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the schematic diagram of cost control model of the present invention.
In figure: the first solvent adsorption device 1, the second solvent adsorption device 1', condenser 2, solvent density detector 3, steam control valve 4, steam pipework 5, desorption gas pipeline 6, control device 7, stripping liquid pipeline 8, solvent tank 9, gaseous mixture inlet pipe 10, tail gas discharging pipe 11, exhaust relief valve 12, desorption gas valve 13, gaseous mixture intake valve 14, steam inlet valve 15, fixed gas drain valve 16, solvent recovery cost A, steam consumption cost B, tail gas solvent consumption cost C, solvent consumption cost D when tail gas environmental emission standard.
Detailed description of the invention
Embodiment 1:
In Fig. 1, a kind of solvent recovery cost emission control system, solvent adsorption device one end is connected with steam pipework 5 and gaseous mixture inlet pipe 10, and steam pipework 5 is provided with steam control valve 4, and the other end of solvent adsorption device is connected with tail gas discharging pipe 11 and desorption gas pipeline 6;
Preferably, solvent adsorption device is multiple, for example the first solvent adsorption device 1 in Fig. 1 and the second solvent adsorption device 1', and when one of them is in desorption state, other solvent adsorption device is adsorbed state.
On steam pipework 5, gaseous mixture inlet pipe 10, tail gas discharging pipe 11 and desorption gas pipeline 6, be equipped with valve. In Fig. 1, the steam pipework 5 of each solvent adsorption device is provided with steam inlet valve 15, and gaseous mixture inlet pipe 10 is provided with gaseous mixture intake valve 14, and tail gas discharging pipe 11 is provided with exhaust relief valve 12, and desorption gas pipeline 6 is provided with desorption gas valve 13. Open when steam inlet valve 15 and the desorption gas valve 13 of a solvent adsorption device, gaseous mixture intake valve 14 and exhaust relief valve 12 are closed, and this solvent adsorption device is in desorption state, and steam drives the solvent in solvent adsorption device to recycle section. When steam inlet valve 15 and the desorption gas valve 13 of solvent adsorption device are closed, gaseous mixture intake valve 14 and exhaust relief valve 12 are opened, this solvent adsorption device is in adsorbed state, medium in solvent adsorption device, for example active carbon, by the solvent adsorption in the gaseous mixture that contains acetone, be temporarily stored in solvent adsorption device, the tail gas after absorption is discharged from tail gas discharging pipe 11.
Desorption gas pipeline 6 is connected with the input of condenser 2, and the output of condenser 2 is connected with stripping liquid pipeline 8, and stripping liquid pipeline 8 is connected with solvent tank 9, is provided with solvent density detector 3 on stripping liquid pipeline 8; Condenser 2 is provided with fixed gas drain valve 16.
Solvent density detector 3 is connected with the input of control device 7, and steam control valve 4 is connected with the output of control device 7. Structure thus, realizes according to the feedback of solvent density detector 3 aperture of on-line control steam control valve 4, and then the use amount of steam regulation. Steam consumes more, but desorption process is more thorough, and exhaust emissions is lower.
Described control device 7 is PID control device. Be ratio, integration and differentiation control device, to realize quick, the stable adjusting of steam flow. Control device 7 in this example, according to the testing result of solvent density detector 3, is compared with controlling value, then the aperture of steam control valve 4 is regulated.
Described steam control valve 4 is degree adjustment valve. Structure thus, the in real time consumption of steam regulation.
Described solvent density detector 3 is ultrasonic online solvent density detector. Ultrasonic online solvent density detector, has the features such as reproducible, equipment failure rate is low, equipment cost is reasonable. Propagation attenuation and the fluid density of ultrasonic wave in liquid has good correlation, by the measurement to wavelength and velocity of wave decay, can accurately obtain fluid density.
Embodiment 2:
On the basis of embodiment 1, a kind of method that adopts above-mentioned solvent recovery cost emission control system, comprises the following steps:
One,, according to the data of solvent density detector 3, obtain the concentration data of solvent in stripping liquid; This proportion by solvent calculates.
Two, set up function x=f (y),
In formula, x is steam consumption, and unit is L;
Y is the concentration of solvent in stripping liquid, and unit is mol/kg;
Calculate steam consumption cost B according to steam consumption x;
Three, opening relationships formula A=B+C, constraints is C < D
Cost recovery is mainly consumed by steam and solvent loss two parts form, and generally, both are obvious negative correlation, be that steam consumption is more, steam cost is larger, but desorption process is more thorough, the solvent strength of discharging from tail gas discharging pipe 11 is lower, and solvent loss is just relatively less. Vice versa.
In formula, A is solvent recovery cost, and unit is unit; It is the expense that solvent recovery is paid.
B is steam consumption cost, and unit is unit; Comprise that fuel cost, pipe damage and cost of labor; The concentration of solvent in steam consumption in this example and stripping liquid, is the result in unit interval T.
C is tail gas solvent consumption cost, and unit is unit; In this example, introduced tail gas solvent consumption cost,, at the cost of the solvent discharging of tail gas, if this partial solvent is recovered, this departmental cost just needn't pay, and the part of discharge is contributed in cost. Obtain according to the calculation of price of solvent.
Solvent consumption cost when D is tail gas environmental emission standard, unit is unit; For ease of calculating, tail gas environmental emission standard is also converted into solvent consumption cost.
In above-mentioned model, B and C are interlock parameter, and steam consumption cost B increases, and corresponding tail gas solvent consumption cost C reduces.
Four, adopt diagram method as shown in Figure 2, ask the minimum of a value of solvent recovery cost A; Taking steam consumption cost B as independent variable, from less preset value, progressively increase, the corresponding increase of steam consumption cost B, calculates tail gas solvent consumption cost C by solvent measuring instrument 11, and then obtains solvent recovery cost A.
Numerical value according to A when the minimum of a value, obtains steam consumption x; Referring to Fig. 2, along with the increase of steam consumption, shown in the line segment B in figure, tail gas solvent consumption cost C, after initially sharply declining, tends towards stability. Because solvent price is higher, the position that solvent recovery cost is minimum, it is not the position of the solvent consumption cost D below while approaching tail gas environmental emission standard, but approach the position that line segment B and C intersect, at minimum solvent recovery cost A place, the solvent in exhaust emissions will be significantly lower than tail gas environmental emission standard.
By above step, be no more than under the prerequisite of tail gas environmental emission standard, realize at lower cost recovery and the emission control of solvent.
The above embodiments are only the preferred technical solution of the present invention, and should not be considered as for restriction of the present invention, and the feature in embodiment and embodiment in the application, in the situation that not conflicting, can be combined mutually. The technical scheme that protection scope of the present invention should be recorded with claim, comprises that in the technical scheme that claim records, the alternative that is equal to of technical characterictic is protection domain. Being equal within the scope of this, replaces and improves, also within protection scope of the present invention.
Claims (7)
1. a solvent recovery cost emission control system, it is characterized in that: solvent adsorption device one end is connected with steam pipework (5) and gaseous mixture inlet pipe (10), steam pipework (5) is provided with steam control valve (4), and the other end of solvent adsorption device is connected with tail gas discharging pipe (11) and desorption gas pipeline (6);
Desorption gas pipeline (6) is connected with the input of condenser (2), and the output of condenser (2) is connected with stripping liquid pipeline (8), is provided with solvent density detector (3) on stripping liquid pipeline (8);
Solvent density detector (3) is connected with the input of control device (7), and steam control valve (4) is connected with the output of control device (7).
2. a kind of solvent recovery cost emission control system according to claim 1, is characterized in that: described control device (7) is PID control device.
3. a kind of solvent recovery cost emission control system according to claim 1, is characterized in that: described steam control valve (4) is degree adjustment valve.
4. a kind of solvent recovery cost emission control system according to claim 1, is characterized in that: described solvent density detector (3) is ultrasonic online solvent density detector.
5. a kind of solvent recovery cost emission control system according to claim 1, is characterized in that: on steam pipework (5), gaseous mixture inlet pipe (10), tail gas discharging pipe (11) and desorption gas pipeline (6), be equipped with valve.
6. a kind of solvent recovery cost emission control system according to claim 1, is characterized in that: described solvent adsorption device is multiple, and when one of them is in desorption state, other solvent adsorption device is adsorbed state.
7. a method for the solvent recovery cost emission control system described in employing claim 1 ~ 5 any one, is characterized in that comprising the following steps:
One,, according to the data of solvent density detector (3), obtain the concentration data of solvent in stripping liquid;
Two, set up function x=f (y),
In formula, x is steam consumption, and unit is L;
Y is the concentration of solvent in stripping liquid, and unit is mol/kg;
Calculate steam consumption cost B according to steam consumption x;
Three, opening relationships formula A=B+C, constraints is C < D
In formula, A is solvent recovery cost, and unit is unit;
B is steam consumption cost, and unit is unit;
C is tail gas solvent consumption cost, and unit is unit;
Solvent consumption cost when D is tail gas environmental emission standard, unit is unit;
Four, adopt diagram method, ask the minimum of a value of A, in Fig. 2, taking steam consumption cost (B) as independent variable, from less preset value, progressively increase steam consumption cost (B), obtain tail gas solvent consumption cost (C) by solvent measuring instrument (11), obtain solvent recovery cost (A);
By above step, be no more than under the prerequisite of tail gas environmental emission standard, realize at lower cost recovery and the emission control of solvent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610138555.1A CN105607487A (en) | 2016-03-11 | 2016-03-11 | Solvent recovery cost discharge control device, and method thereof |
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| CN201610138555.1A CN105607487A (en) | 2016-03-11 | 2016-03-11 | Solvent recovery cost discharge control device, and method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0372984A (en) * | 1989-04-11 | 1991-03-28 | Japan Fuirudo Kk | Solvent recovery device for cleaning mechanism |
| CN101301558A (en) * | 2007-05-08 | 2008-11-12 | 北京云辰天环保科技有限公司 | Activated carbon fiber organic solvent recovery novel technique using nitrogen as desorption medium |
| CN101386584A (en) * | 2006-12-14 | 2009-03-18 | 拜尔材料科学股份公司 | Method for controlling production process |
| CN102234852A (en) * | 2010-04-21 | 2011-11-09 | 聚隆纤维股份有限公司 | Solvent recovery method of Lyocell fibers |
| CN102266703A (en) * | 2011-06-30 | 2011-12-07 | 陆书明 | Environment-friendly device for recycling and treating solvents in tail gas |
| CN102614731A (en) * | 2012-04-05 | 2012-08-01 | 泉州市天龙环境工程有限公司 | Purifying device for paint spraying organic waste gas and solvent recovering method thereof |
| CN102836564A (en) * | 2012-08-31 | 2012-12-26 | 南京理工大学 | Condensation and adsorption-combined organic solvent recovering device |
| CN205405099U (en) * | 2016-03-11 | 2016-07-27 | 湖北新阳特种纤维股份有限公司 | Solvent recovery cost discharges controlling means |
-
2016
- 2016-03-11 CN CN201610138555.1A patent/CN105607487A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0372984A (en) * | 1989-04-11 | 1991-03-28 | Japan Fuirudo Kk | Solvent recovery device for cleaning mechanism |
| CN101386584A (en) * | 2006-12-14 | 2009-03-18 | 拜尔材料科学股份公司 | Method for controlling production process |
| CN101301558A (en) * | 2007-05-08 | 2008-11-12 | 北京云辰天环保科技有限公司 | Activated carbon fiber organic solvent recovery novel technique using nitrogen as desorption medium |
| CN102234852A (en) * | 2010-04-21 | 2011-11-09 | 聚隆纤维股份有限公司 | Solvent recovery method of Lyocell fibers |
| CN102266703A (en) * | 2011-06-30 | 2011-12-07 | 陆书明 | Environment-friendly device for recycling and treating solvents in tail gas |
| CN102614731A (en) * | 2012-04-05 | 2012-08-01 | 泉州市天龙环境工程有限公司 | Purifying device for paint spraying organic waste gas and solvent recovering method thereof |
| CN102836564A (en) * | 2012-08-31 | 2012-12-26 | 南京理工大学 | Condensation and adsorption-combined organic solvent recovering device |
| CN205405099U (en) * | 2016-03-11 | 2016-07-27 | 湖北新阳特种纤维股份有限公司 | Solvent recovery cost discharges controlling means |
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Application publication date: 20160525 |