CN104722159A - Washing cooling device and method for methanol-to-olefins reaction product gas - Google Patents
Washing cooling device and method for methanol-to-olefins reaction product gas Download PDFInfo
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- CN104722159A CN104722159A CN201510181682.5A CN201510181682A CN104722159A CN 104722159 A CN104722159 A CN 104722159A CN 201510181682 A CN201510181682 A CN 201510181682A CN 104722159 A CN104722159 A CN 104722159A
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Abstract
The invention discloses a washing cooling device and method for methanol-to-olefins reaction product gas. The device comprises a first washing cooling unit and a second washing cooling unit, the first washing cooling unit is provided with a product gas inlet and a first washing cooling gas outlet, the second washing cooling unit is provided with a second washing cooling gas inlet and a second washing cooling gas outlet, and the second washing cooling gas inlet is connected with the first washing cooling gas outlet; the second washing cooling gas outlet is connected with a methanol-to-olefins reaction oil-water separating device; the first washing cooling unit comprises a washing tower, and the upper tower diameter and the lower tower diameter of the washing tower are identical. The upper and lower tower diameters of the washing tower are identical, jamming of a tray of the washing tower due to heavy-hydrocarbon condensation is avoided; in addition, the second washing cooling unit is added, and heavy hydrocarbon in the product gas is further removed, so that the product gas can reach subsequent temperature required to reach the separating device without affection on stability of the separating device.
Description
Technical field
The present invention relates to methanol to olefins reaction field, in particular to a kind of wash cooling apparatus and method of methanol to olefins reaction gas product.
Background technology
The low-carbon alkene such as ethene, propylene is basic material important in modern petrochemical industry, and the production of large chemicals such as synthetic plastic, synthetic rubber, synthetic fibers all be unable to do without alkene.Traditional ethene, the production of propylene are raw material with oil, are limited by the restriction of petroleum resources.And China's oil resource is relatively deficient, the demand of oil and petroleum chemicals but increases rapidly along with socioeconomic development, and oil demand amount has been far longer than domestic production amount, and imbalance between supply and demand becomes increasingly conspicuous.By ammonia from coal, then alleviate through methanol-to-olefins the trend that oil supply contradiction is future development.
After methanol to olefins reaction, gas is made up of steam, hydrocarbon gas and catalyst fines, and the heavy hydrocarbon containing trace, freezing point is at 65-70 DEG C.After methanol to olefins reaction, gas removes while overheated heat makes gas obtain saturated heat through quench tower usually, also carries out dedusting to gas after reaction, then enters from the bottom of water scrubber, go out after the washing of a large amount of water coolings from the top of water scrubber.Due to the temperature on water scrubber top lower (40-55 DEG C), heavy hydrocarbon is easily condensed into oily liquids, and the liquid heavy hydrocarbon of condensation mixes meeting blocking portion tower tray with catalyst fines, after making follow-up reaction gas by time pressure drop increase, affect the operation of gas downstream compressor, downstream unit fluctuation, product even may be caused defective, even stop work.
Therefore, still need to improve existing MTO technology, to prevent after methanol to olefins reaction in gas product wash cooling process, the harmful effect brought with catalyst fines mixing blocking portion tower tray after heavy hydrocarbon condensation.
Summary of the invention
Main purpose of the present invention is the wash cooling apparatus and method providing a kind of methanol to olefins reaction gas product, to improve in prior art after methanol to olefins reaction in gas product wash cooling process, the defect brought with catalyst fines mixing blocking portion tower tray after heavy hydrocarbon condensation.
To achieve these goals, according to an aspect of the present invention, provide a kind of wash cooling device of methanol to olefins reaction gas product, this device comprises: the first wash cooling unit, has gas product entrance and the outlet of the first wash cooling gas; Second wash cooling unit, have the second wash cooling gas entrance and the outlet of the second wash cooling gas, and the second wash cooling gas entrance exports with the first wash cooling gas and is connected; Second wash cooling gas outlet is connected with the oily-water seperating equipment of methanol to olefins reaction; Wherein, the first wash cooling unit comprises water scrubber, and the tower diameter up and down of water scrubber is identical.
Further, the height of water scrubber is 15 ~ 25m.
Further, the second wash cooling unit comprises one or more groups heat exchanger, heat exchanger is provided with the second wash cooling gas entrance and the outlet of the second wash cooling gas, and the second wash cooling gas entrance exports with the first wash cooling gas and is connected.
Further, the second wash cooling unit is 2 ~ 5 groups of heat exchangers.
Further, be arranged in parallel between heat exchanger.
Further, heat exchanger comprises: the first water cooler, the first water cooler is provided with liquid collection portion, and liquid collection portion is arranged between the second wash cooling gas entrance and the outlet of the second wash cooling gas.
Further, heat exchanger also comprises: the first aerial cooler, is arranged between water scrubber and the first water cooler, and the first aerial cooler has Air flow gas entrance and the outlet of Air flow gas; Air flow gas entrance exports with the first wash cooling gas and is connected, and the outlet of Air flow gas is connected with the second wash cooling gas entrance.
Further, heat exchanger also comprises the steaming entrance be arranged on the first water cooler, steaming entrance is used for cleaning when heat exchanger is in off working state.
Further, the second wash cooling unit also comprises oil water tank, is arranged between the first water cooler and the oily-water seperating equipment of methanol to olefins reaction.
Further, the bottom of water scrubber is also provided with oil partition tank, is connected with oil water tank by oil-water pipeline.
Further, the first wash cooling unit also comprises the second water cooler and/or the second aerial cooler, is connected with water scrubber by washing water pipeline, for lowering the temperature to the washing water in water scrubber.
According to a further aspect in the invention, provide a kind of wash cooling method of methanol to olefins reaction gas product, method comprises: carry out first time wash cooling to methanol to olefins reaction gas product, gas product of being lowered the temperature in advance; Second time wash cooling is carried out to pre-cooling gas product, obtains gas product.
Further, carry out second time wash cooling to pre-cooling gas product, the step obtaining gas product to be separated comprises: carry out Air flow to pre-cooling gas product, obtain gas product of lowering the temperature; Second time wash cooling is carried out to cooling gas product, obtains gas product to be separated.
Further, adopt washing water to lower the temperature in advance in wash cooling process for the first time, the temperature of washing water is 50 ~ 60 DEG C, and pressure is 0.15 ~ 1.5MPa.
Further, in air cooled process, the temperature of air is outdoor environment temperature, and pressure is 0.15 ~ 0.2MPa; Adopt recirculated water to lower the temperature in advance in second time wash cooling process, the temperature of recirculated water is 25 ~ 35 DEG C; Pressure is 0.15 ~ 0.2MPa.
Apply technical scheme of the present invention, by improving existing water scrubber, making the tower diameter up and down of water scrubber consistent, avoiding the blocking to water scrubber 11 tower tray that heavy hydrocarbon condensation causes, slowed down the condensation rate of heavy hydrocarbon simultaneously, for the follow-up heavy hydrocarbon that eliminates as much as possible provides the foundation; And the setting of the second wash cooling unit 2, on the basis that water scrubber 11 is tentatively lowered the temperature, eliminate the heavy hydrocarbon in gas product as far as possible up hill and dale, not only make the temperature that the temperature of gas product obtains required for later separation device, and the stability of downstream separation device can not be affected.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the wash cooling device schematic diagram according to a kind of typical methanol to olefins reaction gas product provided by the present invention.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The mist obtained after the present invention's said " gas product " refers to methanol to olefins reaction.
Mentioned as background technology part, in the prior art, exist because of the heavy hydrocarbon containing trace in reactor product gas in methanol-to-olefins process, and easily mix with a small amount of catalyst fines carried secretly in gas product and block the tower tray of water scrubber 11 in the process of wash cooling, and then affect the defect of stability of downstream unit.In order to improve above-mentioned defect, in a kind of typical embodiment of the present invention, as shown in Figure 1, provide a kind of wash cooling device of methanol to olefins reaction gas product, this device comprises: the first wash cooling unit 1 and the second wash cooling unit 2, first wash cooling unit 1, has gas product entrance and the outlet of the first wash cooling gas; Second wash cooling unit 2, have the second wash cooling gas entrance and the outlet of the second wash cooling gas, and the second wash cooling gas entrance exports with the first wash cooling gas and is connected; Second wash cooling gas outlet is connected with the oily-water seperating equipment of methanol to olefins reaction; Wherein, the first wash cooling unit 1 comprises water scrubber 11, and the tower diameter up and down of water scrubber 11 is identical.
Above-mentioned methanol to olefins reaction gas product wash cooling device of the present invention, by improving existing water scrubber, make the tower diameter up and down of water scrubber consistent, avoid the blocking to water scrubber 11 tower tray that heavy hydrocarbon condensation causes, slowed down the condensation rate of heavy hydrocarbon simultaneously, for the follow-up heavy hydrocarbon that eliminates as much as possible provides the foundation; And the setting of the second wash cooling unit 2, on the basis that water scrubber 11 is tentatively lowered the temperature, eliminate the heavy hydrocarbon in gas product as far as possible up hill and dale, not only make the temperature that the temperature of gas product obtains required for later separation device, and the stability of downstream separation device can not be affected.
Eliminate the reduced diameter portion of water scrubber 11 in above-mentioned modifying device of the present invention, reduce manufacture difficulty, and tower height reduces, reduce cost of investment.In the present invention, the height of preferred water scrubber 11 is 15 ~ 25m, within the scope of this, still can carry out condensation to a large amount of steam in gas product, reduces heat, is beneficial to follow-up further cooling.And excessive height, cost of manufacture increases; And highly too low, steam heat distributes relatively less, adds the difficulty of follow-up cooling.
In said apparatus of the present invention, to the concrete equipment of the second wash cooling unit 2 without particular/special requirement, lower the temperature as long as the gas product after to a large amount of steam of removing can be played, and remove the heavy hydrocarbon of wherein condensation, reach the requirement of later separation device.In a kind of preferred embodiment of the present invention, second wash cooling unit 2 comprises one or more groups heat exchanger, heat exchanger is provided with the second wash cooling gas entrance and the outlet of the second wash cooling gas, and the second wash cooling gas entrance exports with the first wash cooling gas and is connected.
Above-mentioned second wash cooling unit 2 of the present invention, by arranging one or more groups heat exchanger, has carried out condensation cooling to gas product further by heat exchanger, the heavy hydrocarbon in gas product can be made to be condensed into fluid oil and to be removed.Heat exchanger package number is more, and condensation effect is better, and the amount of the gas product of condensation process is also larger; Correspondingly, cost also can increase.In the another kind of preferred embodiment of the present invention, above-mentioned second wash cooling unit 2 is 2 ~ 5 groups of heat exchangers.
The set-up mode of above-mentioned heat exchanger can be arranged in series and also can be arranged in parallel, as long as be provided with the second wash cooling unit 2 comprising above-mentioned heat exchanger, can both play and to lower the temperature to gas product and to remove the object of heavy hydrocarbon.In the present invention, preferably multi-group heat exchanger is arranged in parallel.The heat exchanger be arranged in parallel on the one hand can to the component cooling as early as possible of the gas product after water scrubber 11 tentatively cooling, it also avoid the impact on follow-up heat exchanger when single heat exchanger breaks down on the other hand, more importantly can by the replacing between multi-group heat exchanger, avoiding stops work or reduce produces load, can increase long period and the oepration at full load time of device.
In said apparatus of the present invention, to the concrete structure of above-mentioned heat exchanger without particular/special requirement, as long as can make by the impurity heavy hydrocarbon condensate in the gas product of this heat exchanger and separate, can be such as air cooler, water cooler or other forms of heat exchanger.In a kind of preferred embodiment of the present invention, above-mentioned heat exchanger comprises in the first water cooler 21, first water cooler 21 and is provided with liquid collection portion, and liquid collection portion is arranged between the second wash cooling gas entrance and the outlet of the second wash cooling gas.By being provided with the first water cooler 21, (the first water cooler 21 comprises shell side and tube side to above-mentioned heat exchanger of the present invention, be wherein recirculated water in tube side), cooling to the gas product in shell side and heavy hydrocarbon condensation can be realized fast by the temperature of controlled circulation water, and collected steam and the heavy hydrocarbon of condensation by the liquid collection portion be arranged on bottom the first water cooler 21 on shell side, and be removed by this liquid collection portion.
In said apparatus of the present invention, by just can realize further condensation to gas product and cooling containing the heat exchanger of the first water cooler 21.In order to realize cooling more fully, more quickly, in another typical embodiment of the present invention, above-mentioned heat exchanger also comprises the first aerial cooler, is arranged between water scrubber 11 and the first water cooler 21, and the first aerial cooler has Air flow gas entrance and the outlet of Air flow gas; Air flow gas entrance exports with the first wash cooling gas and is connected, and the outlet of Air flow gas is connected with the second wash cooling gas entrance.Being provided with the first aerial cooler further in above-mentioned heat exchanger of the present invention, being lowered the temperature further by the first aerial cooler, is the reduction difficulty that cools of the first water cooler 21, can accelerate cooling simultaneously.
In above-mentioned heat exchanger provided by the present invention, consider the cleaning being convenient to heat exchanger, in the another kind of preferred embodiment of the present invention, above-mentioned heat exchanger also comprises the steaming entrance be arranged on the first water cooler 21, steaming entrance and the second wash cooling gas export the cleaning state that is respectively used to heat exchanger and duty switches.By arranging steaming entrance on heat exchangers, can realize the cleaning of heat exchanger, by cleaning one by one the heat exchanger of difference group, can avoid stops work or reduce produces load, increases device long period and oepration at full load time.In addition, the gas medium of gas product in the shell side due to heat exchanger of the present invention, is, when steam clean without the need to first carrying out the step of discharge opeing, operation environment friendly convenient.
In above-mentioned second wash cooling unit 2 of the present invention, liquid collection portion on first water cooler 21 can realize the collection of liquid towards heavy hydrocarbon and condensed water, but the separation of profit cannot be realized, in order to realize recycling condensed liquid heavy hydrocarbon, in another preferred embodiment of the present invention, also comprise oil water tank 23 in above-mentioned second wash cooling unit 2, be arranged between the first water cooler and the oily-water seperating equipment of methanol to olefins reaction.By being connected with oil water tank by the first water cooler 21, the oil water mixture that the liquid collection portion on the first water cooler is collected enters in oil tank, and is connected with oily-water seperating equipment by oil tank, thus the separation realized the heavy-hydrocarbon oil in profit and recovery.In the another kind of preferred embodiment of the present invention, be also provided with oil-containing water pump between above-mentioned oil water tank 23 and oily-water seperating equipment, by oil-containing water pump, the profit in oil water tank 23 delivered to oily-water seperating equipment and carry out water-oil separating.
Because the heavy hydrocarbon also having part in the first wash cooling unit 1 is condensed into fluid oil, be separated to carry out recovery to the oil of this part, in another preferred embodiment of the present invention, the bottom of water scrubber 11 is also provided with oil partition tank 14, and is connected with oil water tank 23 by oil-water pipeline.Also enter in oil water tank by pipeline by the oil partition tank arranged bottom water scrubber 11, finally enter oily-water seperating equipment in the lump and carry out water-oil separating.
Above-mentioned water scrubber 11 of the present invention just can realize carrying out gas product the effect of condensation and cooling by being arranged on reasonably height, in order to the condensation and cooling-down effect that make water scrubber 11 are faster and better, in the present invention, first wash cooling unit 1 is also provided with the second water cooler 12 and/or the second aerial cooler 13 for cooling water wash water, and be connected with water scrubber 11, for lowering the temperature to the washing water in water scrubber 11 by washing water pipeline.Fast cooling is carried out, for facilitation is played in the condensation of water scrubber 11 and cooling by the washing water arranged separately in the second water cooler 12 and/or the second aerial cooler 13 pairs of water scrubbers 11.Equally, above-mentioned second water cooler 12 and/or the second aerial cooler are set simultaneously and more quickly to the washing water cooling in water scrubber, and then condensation and cooling can be carried out to gas product more quickly.The second water cooler herein cooled for washing water can be that shell side does not have liquid collection portion, does not namely have the second water cooler of liquid bag.
In the another kind of typical embodiment of the present invention, provide a kind of wash cooling method of methanol to olefins reaction gas product, the method comprises: carry out first time wash cooling to methanol to olefins reaction gas product, gas product of being lowered the temperature in advance; Second time wash cooling is carried out to pre-cooling gas product, obtains gas product.
Said method of the present invention, by carrying out twice wash cooling process to methanol to olefins reaction gas product, not only achieve condensation separation and the removal of heavy hydrocarbon in gas product, and the temperature achieved needed for subsequent product air separation, for effective separation of olefin product various in subsequent product gas provides guarantee.
Said method of the present invention, by above-mentioned two step wash cooling steps can realize to the condensation of the said goods gas be separated, but in order to carry out condensation and cooling to gas product quickly, in another preferred embodiment of the present invention, above-mentioned second time wash cooling is carried out to pre-cooling gas product, the step obtaining gas product to be separated comprises: carry out Air flow to pre-cooling gas product, obtain gas product of lowering the temperature; Second time wash cooling is carried out to cooling gas product, obtains gas product to be separated.
Said method of the present invention by before second time wash cooling step, first carries out further air cooling-down to the pre-cooling gas after first time wash cooling, is that follow-up second time wash cooling reduces difficulty, makes gas product reach temperature required more quickly.
In above-mentioned first time of the present invention wash cooling process, adopt washing water to lower the temperature in advance, the temperature of washing water is 50 ~ 60 DEG C, and the gas pressure in water scrubber is at 0.15 ~ 1.5MPa.Adopt washing water or running water can realize the object of wash cooling, but use washing water to reduce costs.The temperature of washing water is controlled in above-mentioned scope, the temperature of the pre-cooling gas obtained can be made at 50 ~ 75 DEG C.
In said method of the present invention, in air cooled process, the temperature of air is outdoor environment temperature, thus makes the temperature of the gas product after Air flow be down to 50 ~ 55 DEG C, and the gas pressure in aerial cooler maintains 0.15 ~ 0.2MPa; Adopt recirculated water to lower the temperature in advance in second time wash cooling process, the temperature of recirculated water is 25 ~ 35 DEG C.By air temperature control in above-mentioned scope, further condensation and cooling can be carried out to pre-cooling gas more quickly, and make the pressure of gas at 0.15 ~ 0.2MPa, wash cold process for follow-up second time and provide convenient.Meanwhile, the temperature of recirculated water in second time wash cooling process is controlled at 25 ~ 35 DEG C, realizes condensation and the cooling of gas product more quickly.
Beneficial effect of the present invention is further illustrated below in conjunction with embodiment.
Embodiment 1
Utilize the device described in accompanying drawing 1, wherein, the height of water scrubber 11 is 15m.Gas product after quench tower wash cooling enters further wash cooling in water scrubber 11 with the high temperature of 110 DEG C, wherein the temperature of washing water is 50 DEG C, carrying out the temperature of lowering the temperature at the bottom of after washing tower to gas product is 90 DEG C, pressure is 0.15MPa, wash cooling tower bottom is entered with top-down washing water at the organic matter of wash cooling process partial condensation, overflow in the oil partition tank 14 of wash cooling tower bottom, enter oil-containing water pot 23 together with water;
After the reaction out of water scrubber 11 top, gas temperature is 70 DEG C, then, after entering into the first aerial cooler 22 and the first water cooler 21 successively, delivers to gas separation unit; Wherein, in the first aerial cooler 22, the temperature of air is outdoor environment temperature, and after this first aerial cooler 22, the temperature of gas is 55 DEG C, and pressure is 0.2MPa; In first water cooler 21, circulating water temperature is 35 DEG C, and after the first water cooler 21, the temperature of gas is 40 DEG C, and pressure is 0.15MPa;
Washing water at the bottom of wash cooling tower successively after the second water cooler 12 (washing water heat exchanger) and the cooling of washing water second aerial cooler 13, returns the tower top of water scrubber 11, recycles after washing water pump 15 boosts;
Close the shell side gateway valve of the first water cooler 21, utilize steam to clean the first water cooler 21.First aerial cooler 22 can adopt the cleaning that uses the same method.The cooling medium of the first water cooler is recirculated water.
Embodiment 2
Utilize the device described in accompanying drawing 1, wherein, the height of water scrubber is 25m.Gas product after quench tower wash cooling enters further wash cooling in water scrubber 11 with the high temperature of 120 DEG C, in water scrubber 11, the temperature of washing water is 60 DEG C, temperature at the bottom of water scrubber is 100 DEG C, pressure is 1.5MPa, wash cooling tower bottom is entered with top-down washing water at the organic matter of wash cooling process partial condensation, overflow in the oil partition tank 14 of wash cooling tower bottom, enter oil-containing water pot 23 together with water;
After the reaction out of water scrubber 11 top, gas temperature is 72 DEG C, then, after entering into the first aerial cooler 22 and the first water cooler 21 successively, delivers to gas separation unit; Wherein, in the first aerial cooler 22, the temperature of air is outdoor environment temperature, and after this first aerial cooler 22, the temperature of gas is 50 DEG C; Pressure is 0.15MPa; In first water cooler 21, circulating water temperature is 25 DEG C, and after the first water cooler 21, the temperature of gas is 38 DEG C; Pressure is 0.15MPa.
Washing water at the bottom of wash cooling tower successively after the second water cooler 12 (washing water heat exchanger) and the cooling of washing water second aerial cooler 13, returns the tower top of water scrubber 11, recycles after washing water pump 15 boosts;
Close the shell side gateway valve of the first water cooler 21, utilize steam to clean the first water cooler 21.First aerial cooler 22 can adopt the cleaning that uses the same method.The cooling medium of the first water cooler is recirculated water.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
The problem of tower tower tray is blocked in condensation of gas process after the present invention can reduce or alleviate methanol to olefins reaction.
(1) water scrubber eliminates reduced diameter portion, and tower height reduces, and investment reduces.
(2) first aerial coolers and the first water cooler can excise cleaning one by one in normal production, produce load, increase device long period and oepration at full load time without the need to stopping work or reducing.
The shell side of (3) first aerial coolers and the first water cooler is gas medium, first without the need to discharge opeing during steam clean, and operation environment friendly convenient.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a wash cooling device for methanol to olefins reaction gas product, is characterized in that, described device comprises:
First wash cooling unit (1), has described gas product entrance and the outlet of the first wash cooling gas;
Second wash cooling unit (2), have the second wash cooling gas entrance and the outlet of the second wash cooling gas, and described second wash cooling gas entrance exports with described first wash cooling gas and is connected; Described second wash cooling gas outlet is connected with the oily-water seperating equipment of described methanol to olefins reaction;
Wherein, described first wash cooling unit (1) comprises water scrubber (11), and the tower diameter up and down of described water scrubber (11) is identical.
2. device according to claim 1, is characterized in that, the height of described water scrubber (11) is 15 ~ 25m.
3. device according to claim 1, it is characterized in that, described second wash cooling unit (2) comprises one or more groups heat exchanger, described heat exchanger is provided with the second wash cooling gas entrance and the outlet of the second wash cooling gas, and described second wash cooling gas entrance exports with described first wash cooling gas and is connected.
4. device according to claim 3, is characterized in that, described second wash cooling unit (2) is 2 ~ 5 groups of heat exchangers.
5. device according to claim 4, is characterized in that, is arranged in parallel between described heat exchanger.
6. the device according to any one of claim 3 to 5, is characterized in that, described heat exchanger comprises:
First water cooler (21), described first water cooler (21) is provided with liquid collection portion, and described liquid collection portion is arranged between described second wash cooling gas entrance and the outlet of the second wash cooling gas.
7. device according to claim 6, is characterized in that, described heat exchanger also comprises:
First aerial cooler (22), be arranged between described water scrubber (11) and described first water cooler (21), described first aerial cooler (22) has Air flow gas entrance and the outlet of Air flow gas; Described Air flow gas entrance exports with described first wash cooling gas and is connected, and described Air flow gas outlet is connected with described second wash cooling gas entrance.
8. device according to claim 7, it is characterized in that, described heat exchanger also comprises the steaming entrance be arranged on described first water cooler (21), described steaming entrance is used for cleaning when being in off working state to described heat exchanger.
9. device according to claim 7, it is characterized in that, described second wash cooling unit (2) also comprises oil water tank (23), is arranged between described first water cooler (21) and the oily-water seperating equipment of described methanol to olefins reaction.
10. device according to claim 9, it is characterized in that, the bottom of described water scrubber (11) is also provided with oil partition tank (14), and described oil partition tank (14) is connected with described oil water tank (23) by oil-water pipeline.
11. devices according to claim 1, it is characterized in that, described first wash cooling unit (1) also comprises the second water cooler (12) and/or the second aerial cooler (13), be connected with described water scrubber (11) by washing water pipeline, for lowering the temperature to the washing water in described water scrubber (11).
The wash cooling method of 12. 1 kinds of methanol to olefins reaction gas products, is characterized in that, described method comprises:
First time wash cooling is carried out to described methanol to olefins reaction gas product, gas product of being lowered the temperature in advance;
Second time wash cooling is carried out to described pre-cooling gas product, obtains described gas product.
13. methods according to claim 12, is characterized in that, carry out second time wash cooling to described pre-cooling gas product, the step obtaining gas product to be separated comprises:
Air flow is carried out to described pre-cooling gas product, obtains gas product of lowering the temperature;
Second time wash cooling is carried out to described cooling gas product, obtains described gas product.
14. methods according to claim 12, is characterized in that, adopt washing water to lower the temperature in advance in described first time wash cooling process, the temperature of described washing water is 50 ~ 60 DEG C, and the pressure of the described pre-cooling gas product obtained is 0.15 ~ 1.5MPa.
15. methods according to claim 13, is characterized in that, in described air cooled process, the temperature of air is outdoor environment temperature, and the pressure of the described cooling gas product obtained is 0.15 ~ 0.2MPa; Adopt recirculated water to lower the temperature in advance in described second time wash cooling process, the temperature of described recirculated water is 25 ~ 35 DEG C, and the pressure of the described gas product obtained is 0.15 ~ 0.2MPa.
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| CN114225602A (en) * | 2021-11-03 | 2022-03-25 | 天津大沽化工股份有限公司 | Water washing system for methanol-to-olefin product gas |
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| CN109260886A (en) * | 2018-11-06 | 2019-01-25 | 国家能源投资集团有限责任公司 | The cooling device of methanol-to-olefins product gas |
| CN109260886B (en) * | 2018-11-06 | 2021-04-09 | 国家能源投资集团有限责任公司 | Cooling device for methanol-to-olefin product gas |
| CN111282372A (en) * | 2020-01-16 | 2020-06-16 | 董国亮 | Heat recovery method for washing tower process water |
| CN114225602A (en) * | 2021-11-03 | 2022-03-25 | 天津大沽化工股份有限公司 | Water washing system for methanol-to-olefin product gas |
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