CN112169539A - Operation control method for multi-absorption-tower parallel operation full-oil recovery system - Google Patents
Operation control method for multi-absorption-tower parallel operation full-oil recovery system Download PDFInfo
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- 238000011084 recovery Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 198
- 238000010521 absorption reaction Methods 0.000 claims abstract description 186
- 238000012546 transfer Methods 0.000 claims abstract description 134
- 238000007872 degassing Methods 0.000 claims abstract description 87
- 238000004458 analytical method Methods 0.000 claims description 41
- 238000003795 desorption Methods 0.000 claims description 25
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 127
- 238000005096 rolling process Methods 0.000 description 13
- 239000010731 rolling oil Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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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
- B01D53/14—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 absorption
- B01D53/1412—Controlling the absorption process
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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
- B01D53/14—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 absorption
- B01D53/1425—Regeneration of liquid absorbents
-
- 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
- B01D53/14—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 absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
A multi-absorption tower parallel operation full oil recovery system operation control method, a system controller collects data of an absorption tower outlet flowmeter, an absorption tower liquid level meter, a degassing tower liquid level meter, an analytical tower liquid level meter and a transfer oil tank liquid level meter, and controls the operation speed of an absorption tower circulating pump, a degassing tower circulating pump, an analytical tower circulating pump and a transfer oil tank circulating pump according to the data of the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analytical tower liquid level meter and the transfer oil tank liquid level meter; the running speed of the transfer oil tank circulating pump is jointly controlled by the transfer oil tank liquid level meter and the absorption tower liquid level meter, and the system controller controls the running speed of the transfer oil tank circulating pump according to the difference values between the transfer oil tank liquid level meter and the absorption tower liquid level meter and the set normal value, so that the balance and stability of the stored liquid in the multiple absorption towers and the transfer oil tank are finally realized.
Description
Technical Field
The invention relates to the technical field of recovery of oil-containing flue gas generated in cold rolling and foil rolling processes in the aluminum processing industry, in particular to an operation control method of a full-oil recovery system with multiple absorption towers operating in parallel.
Background
The oily fume generated in the cold rolling and foil rolling processes in the existing aluminum processing industry is mainly collected, treated and recycled by adopting a full-oil recovery system; the system is an energy-saving, consumption-reducing and emission-reducing device designed for oil-containing flue gas generated in the rolling process of aluminum plates, strips and foils; the working principle is that the rolling oil in the flue gas is absorbed by utilizing the good intersolubility of the washing oil and the rolling oil and the difference of saturated vapor pressure at the same temperature and pressure, and the washing oil containing the rolling oil is subjected to vacuum analysis by utilizing the distillation range difference of the washing oil and the rolling oil, so that the two oil products are separated, and the purposes of recycling the rolling oil and discharging the air up to the standard are achieved.
However, all the current domestic and foreign full oil recovery systems are single absorption towers, namely, the full oil recovery system only comprises one absorption tower, and when a plurality of rolling mills workIn time, an absorption tower is shared by the air pipes; however, the single absorption tower whole oil recovery system faces the following problems: firstly, along with the technical development, the efficiency of the rolling mill is higher and higher, the smoke discharge amount of the rolling mill is larger and larger, and the smoke discharge amount of the existing single rolling mill reaches 100000-150000 Nm3Perh, 400000-600000 Nm can be achieved if 3-4 rolling mills are used together3The existing absorption tower is difficult to realize the effective recovery of all the rolling oil in the flue gas, and the capacity design of the absorption tower needs to be increased; secondly, fire hazard is increased, when a plurality of rolling mills are connected together through air ducts, if one rolling mill is in fire, if the control is improper, the fire hazard can be spread to other rolling mills, and the fire hazard loss is enlarged; thirdly, when the absorption tower is maintained, all rolling mills need to be shut down, which has overlarge influence on production; fourthly, the investment cost and the use cost of the whole oil recovery system are high due to the redundant air pipes and the large space requirement; therefore, how to solve the above problems of the whole oil recovery system becomes a technical problem faced by the current whole oil recovery system;
in order to solve the problems, a design scheme of parallel connection of multiple absorption towers is gradually favored by users; however, because the rolling mill connected to each absorption tower has different smoke discharge amount and smoke discharge concentration, the traditional control method for controlling the system flow through the traditional flow meter to ensure the liquid level balance of the absorption towers often causes that the liquid level of some absorption towers is higher and the liquid level of some absorption towers is lower, thereby affecting the good operation of the system; therefore, the operation control method of the whole oil recovery system with multiple absorption towers operating in parallel becomes a key problem to be solved.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention discloses an operation control method of a full oil recovery system with multiple absorption towers running in parallel, a system controller collects the data of an absorption tower outlet flowmeter, an absorption tower liquid level meter, a degassing tower liquid level meter, an analytical tower liquid level meter and a transfer oil tank liquid level meter, and controls the operation speed of an absorption tower circulating pump, a degassing tower circulating pump, an analytical tower circulating pump and a transfer oil tank circulating pump according to the data of the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analytical tower liquid level meter and the transfer oil tank liquid level meter; the running speed of the transfer oil tank circulating pump is jointly controlled by the transfer oil tank liquid level meter and the absorption tower liquid level meter, and the system controller controls the running speed of the transfer oil tank circulating pump according to the difference values between the transfer oil tank liquid level meter and the absorption tower liquid level meter and the set normal value, so that the balance and stability of the stored liquid in the multiple absorption towers and the transfer oil tank are finally realized.
In order to realize the purpose, the invention adopts the following technical scheme: an operation control method for a full oil recovery system with multiple absorption towers operating in parallel; the multi-absorption-tower parallel operation full-oil recovery system comprises: a plurality of absorption towers, degassing towers, resolution towers and transfer oil tanks; the absorption tower, the degassing tower, the desorption tower and the transfer oil tank are circularly connected through pipelines, and a plurality of absorption towers are connected in parallel; a certain amount of liquid is stored in the absorption tower, the degassing tower, the desorption tower and the transfer oil tank, and the liquid stored in the absorption tower, the degassing tower, the desorption tower and the transfer oil tank circularly flows through pipelines;
an absorption tower circulating pump and an absorption tower outlet flowmeter are arranged on a connecting pipeline between the absorption tower and the degassing tower in series, and the absorption tower outlet flowmeter is used for measuring the flow of liquid pumped out of the absorption tower and ensuring that the flow of the liquid entering the degassing tower is kept constant; a degassing tower circulating pump is arranged on a connecting pipeline between the degassing tower and the desorption tower; a circulating pump of the desorption tower is arranged on a connecting pipeline between the desorption tower and the transfer oil tank; a transfer oil tank circulating pump is respectively arranged on the transfer oil tank and a connecting pipeline between the absorption towers;
the absorption tower circulating pump, the degassing tower circulating pump and the transfer oil tank circulating pump are variable frequency pumps, and the variable frequency pumps are driven by frequency converters arranged in the system controller, so that the absorption tower circulating pump, the degassing tower circulating pump and the transfer oil tank circulating pump have the advantages of controllable operation speed and high efficiency; the circulation balance of the liquid in the absorption tower, the degassing tower, the desorption tower and the transfer oil tank is realized by controlling the running speeds of the circulation pump of the absorption tower, the circulation pump of the degassing tower, the circulation pump of the desorption tower and the circulation pump of the transfer oil tank;
an absorption tower liquid level meter is arranged on the absorption tower; a degassing tower liquid level meter is arranged on the degassing tower; the analysis tower is provided with an analysis tower liquid level meter; a transfer oil tank liquid level meter is arranged on the transfer oil tank; the liquid level meters are used for measuring the actual liquid level height in the corresponding devices;
the multi-absorption-tower parallel-operation full-oil recovery system also comprises a system controller which is respectively electrically connected with the absorption tower circulating pump, the degassing tower circulating pump, the analysis tower circulating pump, the transfer oil tank circulating pump, the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analysis tower liquid level meter and the transfer oil tank liquid level meter;
the operation control method of the multi-absorption-tower parallel operation full-oil recovery system comprises the following steps: the system controller collects data of an absorption tower outlet flowmeter, an absorption tower liquid level meter, a degassing tower liquid level meter, an analysis tower liquid level meter and a transfer oil tank liquid level meter, and controls the running speeds of an absorption tower circulating pump, a degassing tower circulating pump, an analysis tower circulating pump and a transfer oil tank circulating pump according to the data of the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analysis tower liquid level meter and the transfer oil tank liquid level meter; the operation speed of the transfer oil tank circulating pump is jointly controlled by a transfer oil tank liquid level meter and an absorption tower liquid level meter, and the system controller controls the operation speed of the transfer oil tank circulating pump according to the difference value between the measured values of the transfer oil tank liquid level meter and the absorption tower liquid level meter and the set normal value, so that the relative balance and stability of the stored liquid in the multiple absorption towers and the transfer oil tank are finally realized.
Further, the outlet flow of the absorption tower is set to be a fixed value; the running speed of the circulating pump of the absorption tower is controlled by an outlet flow meter of the absorption tower, and a system controller controls the running speed of the circulating pump of the absorption tower according to the difference value between the measured value of the outlet flow meter of the absorption tower and a set fixed value; the operation speed of the circulating pump of the absorption tower is controlled by PID, the flow of the liquid pumped into the degassing tower can be accurately controlled, and the stable operation and the degassing efficiency of the degassing tower are ensured.
Further, the degassing tower liquid level meter is set to be a normal value; the running speed of the circulating pump of the degassing tower is controlled by a degassing tower liquid level meter, and the system controller carries out forward regulation on the running speed of the circulating pump of the degassing tower according to the difference value between the measured value of the degassing tower liquid level meter and a set normal value, namely when the measured value of the degassing tower liquid level meter is higher than the set normal value, the running speed of the circulating pump of the degassing tower is increased, and when the measured value of the degassing tower liquid level meter is lower than the set normal value, the running speed of the circulating pump of the degassing tower is reduced; the liquid level height in the degassing tower is allowed to have fluctuation within a certain range, when the multi-absorption-tower parallel operation whole oil recovery system actually operates, the quality of liquid stored in the degassing tower is far higher than that of liquid stored in other devices, the liquid is made into a buffer pool by utilizing the characteristic of high quality of liquid stored in the degassing tower, and the liquid level height in the other devices of the multi-absorption-tower parallel operation whole oil recovery system is stabilized within the set range through the fluctuation adjustment of the liquid level height in the degassing tower.
Further, a normal value is set for the liquid level meter of the analysis tower; the operation speed of the circulating pump of the analysis tower is controlled by the liquid level meter of the analysis tower, and the system controller carries out forward adjustment on the operation speed of the circulating pump of the analysis tower according to the difference value between the measured value of the liquid level meter of the analysis tower and the set normal value, namely when the measured value of the liquid level meter of the analysis tower is higher than the set normal value, the operation speed of the circulating pump of the analysis tower is increased, and when the measured value of the liquid level meter of the analysis tower is lower than the set normal value, the operation speed of the circulating pump of the analysis tower is reduced.
Furthermore, the transfer oil tank liquid level meter is set with a transfer oil tank liquid level normal value kzzThe ultrahigh value k of the liquid level of the transfer oil tankzhUltralow value k of liquid level of transfer oil tankzl(ii) a The absorption tower liquid level meter is set with a normal absorption tower liquid level value kxzThe ultrahigh value k of the liquid level of the absorption towerxhUltra-low k value of liquid level of absorption towerxl(ii) a The running speed of the circulating pump of the transfer oil tank is set to be a normal value nzThe running speed of the transfer oil tank circulating pump is jointly controlled by a transfer oil tank liquid level meter and an absorption tower liquid level meter; the calculation formula of the running speed of the circulating pump of the transfer oil tank is as follows:
wherein: n is the running speed of the circulating pump of the transfer oil tank; k is a radical ofzIndicating the value of a transfer oil tank liquid level meter; k1Converting the liquid level difference of the transfer oil tank into a coefficient;
indicating the value of a liquid level meter of the absorption tower; k2The conversion coefficient of the liquid level difference of the absorption tower is obtained;
in the above-mentioned formula,
the control coefficient of the liquid level height of the transfer oil tank is actually that the operation speed of a plurality of transfer oil tank circulating pumps is integrally adjusted according to the measured value of a transfer oil tank liquid level meter so as to ensure that the liquid height stored in the transfer oil tank does not exceed kzh、kzlA range of (d);
the liquid level height independent control coefficients of a plurality of absorption towers are actually used for independently adjusting the running speed of a transfer oil tank circulating pump corresponding to each absorption tower according to the measured value of each absorption tower liquid level meter so as to ensure that the liquid heights stored in each absorption tower are kept consistent, and finally, the relative balance and stability of liquid stored in a plurality of absorption towers and a transfer oil tank are realized;
wherein, K1The ratio of the mass of the liquid stored in the transfer oil tank to the mass of the liquid stored in the operating absorption tower is changed along with the change of the number of the operating absorption towers.
Furthermore, the liquid level in the transfer oil tank is higher than kzhOr below kzlAnd in time, the system controller sends out an alarm signal and stops the system so as to ensure the safe operation of the full-oil recovery system with the multiple absorption towers operating in parallel.
Further, when the liquid level in the absorption tower is higher than kxhOr below kxlAnd in time, the system controller sends out an alarm signal and stops the system so as to ensure the safe operation of the full-oil recovery system with the multiple absorption towers operating in parallel.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the invention discloses an operation control method of a full oil recovery system with multiple absorption towers running in parallel.A system controller collects data of an absorption tower outlet flowmeter, an absorption tower liquid level meter, a degassing tower liquid level meter, an analytical tower liquid level meter and a transfer oil tank liquid level meter, and controls the operation speeds of an absorption tower circulating pump, a degassing tower circulating pump, an analytical tower circulating pump and a transfer oil tank circulating pump according to the data of the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analytical tower liquid level meter and the transfer oil tank liquid level meter; the running speed of the transfer oil tank circulating pump is jointly controlled by a transfer oil tank liquid level meter and an absorption tower liquid level meter, and the system controller controls the running speed of the transfer oil tank circulating pump according to the difference values between the transfer oil tank liquid level meter and the absorption tower liquid level meter and the set normal value, so that the balance and stability of liquid stored in the multiple absorption towers and the transfer oil tank are finally realized; the operation control method of the full oil recovery system with the absorption towers running in parallel successfully solves the problem of unbalanced liquid level among the multiple absorption towers in the parallel design scheme of the multiple absorption towers, thereby ensuring the stable and good operation of the full oil recovery system with the multiple absorption towers running in parallel.
Drawings
FIG. 1 is a schematic diagram of the operation control method of the whole oil recovery system with multiple absorption towers operating in parallel.
In the figure: t101 is an absorption tower 1, T102 is an absorption tower 2, PM101 is an absorption tower 1 circulating pump, PM102 is an absorption tower 2 circulating pump, FIE201 is an absorption tower 1 outlet flow meter, FIE202 is an absorption tower 2 outlet flow meter, T201 is a degassing tower, LIE201 is a degassing tower level meter, PM201 is a degassing tower circulating pump, T401 is a desorption tower, LIE401 is a desorption tower level meter, PM401 is a desorption tower circulating pump, LIE901 is a transfer oil tank level meter, LIE101 is an absorption tower 1 level meter, T901 is a transfer oil tank, LIE102 is an absorption tower 2 level meter, PM901 is a transfer oil tank circulating pump 1, PM902 is a transfer oil tank circulating pump 2; wherein the solid line represents the process flow; wherein the dashed line represents electrical feedback control.
Detailed Description
The present invention will be explained in detail by the following examples, which are disclosed for the purpose of protecting all technical improvements within the scope of the present invention.
An operation control method of a multi-absorption-tower parallel operation whole oil recovery system, the multi-absorption-tower parallel operation whole oil recovery system comprising: two absorption towers, a degassing tower, an analytical tower and a transfer oil tank; the absorption tower, the degassing tower, the desorption tower and the transfer oil tank are circularly connected through pipelines, and the two absorption towers are connected in parallel; a certain amount of liquid is stored in the absorption tower, the degassing tower, the desorption tower and the transfer oil tank, and the liquid stored in the absorption tower, the degassing tower, the desorption tower and the transfer oil tank circularly flows through pipelines; an absorption tower circulating pump and an absorption tower outlet flowmeter are arranged in series on a connecting pipeline between the absorption tower and the degassing tower; a degassing tower circulating pump is arranged on a connecting pipeline between the degassing tower and the desorption tower; a circulating pump of the desorption tower is arranged on a connecting pipeline between the desorption tower and the transfer oil tank; a transfer oil tank circulating pump is respectively arranged on the transfer oil tank and a connecting pipeline between the absorption towers; the absorption tower circulating pump, the degassing tower circulating pump, the desorption tower circulating pump and the transfer oil tank circulating pump are variable frequency pumps; an absorption tower liquid level meter is arranged on the absorption tower; a degassing tower liquid level meter is arranged on the degassing tower; the analysis tower is provided with an analysis tower liquid level meter; a transfer oil tank liquid level meter is arranged on the transfer oil tank; the multi-absorption-tower parallel-operation full-oil recovery system also comprises a system controller which is respectively electrically connected with the absorption tower circulating pump, the degassing tower circulating pump, the analysis tower circulating pump, the transfer oil tank circulating pump, the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analysis tower liquid level meter and the transfer oil tank liquid level meter;
the operation control method of the multi-absorption-tower parallel operation full-oil recovery system comprises the following steps: the system controller collects data of an absorption tower outlet flowmeter, an absorption tower liquid level meter, a degassing tower liquid level meter, an analysis tower liquid level meter and a transfer oil tank liquid level meter, and controls the running speeds of an absorption tower circulating pump, a degassing tower circulating pump, an analysis tower circulating pump and a transfer oil tank circulating pump according to the data of the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analysis tower liquid level meter and the transfer oil tank liquid level meter; the system controller controls the running speed of the transfer oil tank circulating pump according to the difference value between the transfer oil tank liquid level meter and the absorption tower liquid level meter and a set normal value, and finally realizes the relative balance and stability of the stored liquid in the multiple absorption towers and the transfer oil tank;
the outlet flow of the absorption tower is set to be a fixed value; the running speed of each absorption tower circulating pump is controlled by an absorption tower outlet flow meter, and a system controller controls the running speed of the absorption tower circulating pump according to the difference between the measured value of the absorption tower outlet flow meter and a set fixed value; the operation speed of the circulating pump of the absorption tower is controlled by PID;
the liquid level meter of the degassing tower is set to be a normal value; the running speed of the circulating pump of the degassing tower is controlled by a degassing tower liquid level meter, and the system controller carries out forward adjustment on the running speed of the circulating pump of the degassing tower according to the difference value between the measured value of the degassing tower liquid level meter and a set normal value;
the liquid level meter of the analysis tower is set with a normal value; the running speed of the circulating pump of the analysis tower is controlled by a liquid level meter of the analysis tower, and the system controller carries out forward adjustment on the running speed of the circulating pump of the analysis tower according to the difference value between the measured value of the liquid level meter of the analysis tower and the set normal value;
the transfer oil tank level meter is set with a transfer oil tank level normal value kzzThe ultrahigh value k of the liquid level of the transfer oil tankzhUltralow value k of liquid level of transfer oil tankzl(ii) a The absorption tower liquid level meter is set with a normal absorption tower liquid level value kxzThe ultrahigh value k of the liquid level of the absorption towerxhUltra-low k value of liquid level of absorption towerxl(ii) a The running speed of the circulating pump of the transfer oil tank is set to be a normal value nzThe running speed of the transfer oil tank circulating pump is jointly controlled by a transfer oil tank liquid level meter and an absorption tower liquid level meter; the calculation formulas of the running speeds of the two transfer oil tank circulating pumps are respectively as follows:
the running speed of the transfer oil tank circulating pump 1:
the running speed of the transfer oil tank circulating pump 2:
wherein: n is the running speed of the circulating pump of the transfer oil tank; k is a radical ofzIndicating the value of a transfer oil tank liquid level meter; k1Converting the liquid level difference of the transfer oil tank into a coefficient;
indicating the value of a liquid level meter of the absorption tower; k2The conversion coefficient of the liquid level difference of the absorption tower is obtained;
the height of the liquid level in the transfer oil tank is higher than kzhOr below kzlWhen the system is started, the system controller sends out an alarm signal and stops the machine;
when the liquid level in the absorption tower is higher than kxhOr below kxlAnd when the system is started, the system controller sends out an alarm signal and stops the machine.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical solution according to the technical idea of the present invention fall within the protection scope of the claims of the present invention.
The present invention is not described in detail in the prior art.
Claims (7)
1. An operation control method of a full oil recovery system with multiple absorption towers operating in parallel is characterized in that: the multi-absorption-tower parallel operation full-oil recovery system comprises: a plurality of absorption towers, degassing towers, resolution towers and transfer oil tanks; the absorption tower, the degassing tower, the desorption tower and the transfer oil tank are circularly connected through pipelines, and a plurality of absorption towers are connected in parallel; a certain amount of liquid is stored in the absorption tower, the degassing tower, the desorption tower and the transfer oil tank, and the liquid stored in the absorption tower, the degassing tower, the desorption tower and the transfer oil tank circularly flows through pipelines;
an absorption tower circulating pump and an absorption tower outlet flowmeter are arranged in series on a connecting pipeline between the absorption tower and the degassing tower; a degassing tower circulating pump is arranged on a connecting pipeline between the degassing tower and the desorption tower; a circulating pump of the desorption tower is arranged on a connecting pipeline between the desorption tower and the transfer oil tank; a transfer oil tank circulating pump is respectively arranged on the transfer oil tank and a connecting pipeline between the absorption towers;
the absorption tower circulating pump, the degassing tower circulating pump, the desorption tower circulating pump and the transfer oil tank circulating pump are variable frequency pumps;
an absorption tower liquid level meter is arranged on the absorption tower; a degassing tower liquid level meter is arranged on the degassing tower; the analysis tower is provided with an analysis tower liquid level meter; a transfer oil tank liquid level meter is arranged on the transfer oil tank;
the multi-absorption-tower parallel-operation full-oil recovery system also comprises a system controller which is respectively electrically connected with the absorption tower circulating pump, the degassing tower circulating pump, the analysis tower circulating pump, the transfer oil tank circulating pump, the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analysis tower liquid level meter and the transfer oil tank liquid level meter;
the operation control method of the multi-absorption-tower parallel operation full-oil recovery system comprises the following steps: the system controller collects data of an absorption tower outlet flowmeter, an absorption tower liquid level meter, a degassing tower liquid level meter, an analysis tower liquid level meter and a transfer oil tank liquid level meter, and controls the running speeds of an absorption tower circulating pump, a degassing tower circulating pump, an analysis tower circulating pump and a transfer oil tank circulating pump according to the data of the absorption tower outlet flowmeter, the absorption tower liquid level meter, the degassing tower liquid level meter, the analysis tower liquid level meter and the transfer oil tank liquid level meter; the running speed of the transfer oil tank circulating pump is jointly controlled by the transfer oil tank liquid level meter and the absorption tower liquid level meter, and the system controller controls the running speed of the transfer oil tank circulating pump according to the difference values between the transfer oil tank liquid level meter and the absorption tower liquid level meter and the set normal value, so that the relative balance and stability of the stored liquid in the plurality of absorption towers and the transfer oil tank are finally realized.
2. The operation control method of the multi-absorption tower parallel operation whole oil recovery system according to claim 1, characterized in that: the outlet flow of the absorption tower is set to be a fixed value; the running speed of the circulating pump of the absorption tower is controlled by an outlet flow meter of the absorption tower, and a system controller controls the running speed of the circulating pump of the absorption tower according to the difference value between the measured value of the outlet flow meter of the absorption tower and a set fixed value; the operation speed of the circulating pump of the absorption tower is controlled by PID.
3. The operation control method of the multi-absorption tower parallel operation whole oil recovery system according to claim 1, characterized in that: the liquid level meter of the degassing tower is set to be a normal value; the running speed of the circulating pump of the degassing tower is controlled by a degassing tower liquid level meter, and the system controller carries out forward adjustment on the running speed of the circulating pump of the degassing tower according to the difference value between the measured value of the degassing tower liquid level meter and the set normal value.
4. The operation control method of the multi-absorption tower parallel operation whole oil recovery system according to claim 1, characterized in that: the liquid level meter of the analysis tower is set with a normal value; the running speed of the circulating pump of the analysis tower is controlled by the liquid level meter of the analysis tower, and the system controller carries out forward adjustment on the running speed of the circulating pump of the analysis tower according to the difference value between the measured value of the liquid level meter of the analysis tower and the set normal value.
5. The operation control method of the multi-absorption tower parallel operation whole oil recovery system according to claim 1, characterized in that: the transfer oil tank level meter is set with a transfer oil tank level normal value kzzThe ultrahigh value k of the liquid level of the transfer oil tankzhUltralow value k of liquid level of transfer oil tankzl(ii) a The absorption tower liquid level meter is set with a normal absorption tower liquid level value kxzThe ultrahigh value k of the liquid level of the absorption towerxhUltra-low k value of liquid level of absorption towerxl(ii) a The running speed of the circulating pump of the transfer oil tank is set to be a normal value nzThe running speed of the transfer oil tank circulating pump is jointly controlled by a transfer oil tank liquid level meter and an absorption tower liquid level meter; the calculation formula of the running speed of the circulating pump of the transfer oil tank is as follows:
wherein: n is the running speed of the circulating pump of the transfer oil tank; k is a radical ofzIndicating the value of a transfer oil tank liquid level meter; k1Converting the liquid level difference of the transfer oil tank into a coefficient;
indicating the value of a liquid level meter of the absorption tower; k2Is the conversion coefficient of the liquid level difference of the absorption tower.
6. The operation control method of the whole oil recovery system in which a plurality of absorption towers are operated in parallel according to claim 5, wherein: the height of the liquid level in the transfer oil tank is higher than kzhOr below kzlAnd when the system is started, the system controller sends out an alarm signal and stops the machine.
7. The operation control method of the whole oil recovery system in which a plurality of absorption towers are operated in parallel according to claim 5, wherein: when the liquid level in the absorption tower is higher than kxhOr below kxlAnd when the system is started, the system controller sends out an alarm signal and stops the machine.
Priority Applications (1)
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| CN111471479A (en) * | 2020-04-14 | 2020-07-31 | 青岛飞普思环保科技有限公司 | Oil absorption process for oil gas recovery |
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