CN203385235U - Optimized ammonia absorption refrigeration system - Google Patents
Optimized ammonia absorption refrigeration system Download PDFInfo
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- CN203385235U CN203385235U CN201320363527.1U CN201320363527U CN203385235U CN 203385235 U CN203385235 U CN 203385235U CN 201320363527 U CN201320363527 U CN 201320363527U CN 203385235 U CN203385235 U CN 203385235U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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Abstract
An optimized ammonia absorption refrigeration system comprises a primary absorber, a vacuum pump connected with the primary absorber and a separator connected with the vacuum pump. The primary absorber is connected with an ammonia tank, the ammonia tank is connected with a secondary absorber, the secondary absorber is connected with a rich-liquid tank, the rich-liquid tank is connected with a low-pressure rectifying tower, the low-pressure rectifying tower is connected with a reabsorber, the reabsorber is connected with a liquid ammonia tank, the liquid ammonia tank is connected with a high-pressure rectifying tower, the high-pressure rectifying tower is connected with an ammonia condenser, the ammonia condenser is connected with an ammonia condenser storage tank, and an ammonia discharge pipe is arranged on the ammonia condenser storage tank. A liquid ammonia supplementing pipeline is arranged between the ammonia discharge pipe and the primary absorber, and a control valve is arranged on the liquid ammonia supplementing pipeline. By the adoption of liquid ammonia compounding liquid, compounding speed is increased, and self circulation adjustment is satisfied; a pipeline pump is utilized to deliver the liquid separated by a vacuum-pumping system to the ammonia tank, normal operation of the vacuum pump is guaranteed, and vacuum pressure is enabled to reach a design value.
Description
Technical field
The utility model relates to ammonia and absorbs process field, is specially a kind of ammonia absorption refrigeration system of optimization.
Background technology
The effect of ammonia absorption refrigeration is mainly for low-temperature rectisol provides cold, adopts the cooling flow of two-stage absorption and two stage rectification.The gas ammonia of-40 ℃ from low-temperature rectisol is absorbed at the one-level absorber by the lean solution from the bottom of the low-pressure distillation tower tower, absorption liquid goes secondary absorber to absorb the gas ammonia of 0 ℃ of level, the secondary absorption liquid is called rich solution, rich solution is delivered to the middle part of low-pressure distillation tower as main charging by aqua ammonia pump, rectifying column institute calorific requirement is provided by the low pressure desorption device, thermal source is low-pressure steam, the gas ammonia of low-pressure distillation column overhead removes resorber, by the spray of the solution from the bottom of high-pressure rectification tower tower quinoline, absorbed, after absorption liquid is pressurizeed by multistage pump, deliver to the high-pressure rectification tower, as main charging, high-pressure rectification institute calorific requirement is provided by the high pressure desorption device, thermal source is low-pressure steam, high-pressure rectification tower highly purified gas ammonia out becomes liquefied ammonia after by the circulating cooling water cooling, be sent to low temperature washing device for methanol.The incoagulable gas that one-level absorbs vacuum section, aspirate to maintain by vavuum pump.
But the problem existed in existing ammonia absorption refrigeration flow process has: while 1, driving, dosing speed is too slow; 2, vacuum maintains incessantly; 3, the tower top pressure of the tower reactor temperature of high-low pressure rectifying column and high-low pressure rectifying column rises not get on; 4, rear internal circulating load shakiness, cause the pressure oscillation of low-pressure distillation tower too large; 5,, under the low-temperature rectisol higher load condition, the ammonia absorption refrigeration system is for the problem of ammonia deficiency.
Summary of the invention
Therefore, in order to overcome above-mentioned deficiency of the prior art, the utility model provides a kind of dosing speed of having accelerated, shortened the time of driving, and before low temperature washing device for methanol is not driven, by fluid infusion ammonia pipeline, well complete the function of self-loopa, vacuum system can well be moved, take full advantage of the enthalpy heat of steam, make tower top pressure and the column bottom temperature of rectifying column can reach design load, guarantee the normal operation of rectifying column, guaranteed the ammonia absorption refrigeration system of optimization of the gradient of system ammonia solution concentration.
The purpose of this utility model is achieved in that
A kind of ammonia absorption refrigeration system of optimization, comprise one-level absorber 1, the vavuum pump 3 be connected with one-level absorber 1, the separator 2 be connected with vavuum pump 3; Described one-level absorber 1 is connected with ammonia vessel 5 simultaneously, ammonia vessel 5 connects secondary absorber 7, secondary absorber 7 connects rich solution groove 8, rich solution groove 8 connects low-pressure distillation tower 10, and low-pressure distillation tower 10 connects haustorium 12 again, then haustorium 12 connecting fluid ammonia vessels 13, liquefied ammonia tank 13 connects high-pressure rectification tower 15, high-pressure rectification tower 15 connects ammonia condenser 17, and ammonia condenser 17 connects ammonia condenser storage tank 18, is provided with ammoniacal liquor exterior liquid pipeline on ammonia condenser storage tank 18; Be provided with rich solution pump 6 on the connecting pipe of ammonia vessel 5 and secondary absorber 7, be provided with the firstth aqua ammonia pump 9 on the pipeline between rich solution groove 8 and low-pressure distillation tower 10, be provided with the second aqua ammonia pump 14 on the pipeline between liquefied ammonia tank 13 and high-pressure rectification tower 15; It is characterized in that: be provided with fluid infusion ammonia pipeline 19 between described ammoniacal liquor exterior liquid pipeline and one-level absorber 1, on fluid infusion ammonia pipeline, be provided with control valve;
Be provided with tubing pump 4 on pipeline between described separator 2 and ammonia vessel 5, liquid level gauge on the spot is set on separator 2;
Described low-pressure distillation tower 10 bottoms are connected with one-level absorber 1 by pipeline, are respectively arranged with low pressure desorption device 11 and fluid level control valve on the pipeline between it, are provided with far transmission level meter and liquid level gauge on the spot on low pressure liquid level desorption device 11;
The bottom of described high-pressure rectification tower 15 is connected with haustorium 12 again by pipeline, is provided with high pressure desorption device 16 and rear circular flow valve 20 on the pipeline between it; Be provided with far transmission level meter and liquid level gauge on the spot on high pressure liquid level desorption device 16.
positive beneficial effect:the utility model is on the basis of ammonia absorption refrigeration system flow, the problem existed for this legacy system, provided a kind of optimization process system, overcome the problem existed on the existing system, there is following technique effect: 1, accelerate dosing speed, shortened the time of driving, and before low temperature washing device for methanol is not driven, by fluid infusion ammonia pipeline, well complete the function of self-loopa; 2, the transformation vacuumized, can well move vacuum system, can well guarantee that-40 ℃ of level ammonia evaporate needed vacuum pressure; 3, after the device of still again under the high-low pressure rectifying column has falling film evaporation to change the submergence evaporation into, take full advantage of the enthalpy heat of steam, make tower top pressure and the column bottom temperature of rectifying column can reach design load, guarantee the normal operation of rectifying column, guaranteed the gradient of system ammonia solution concentration; 4, rear circular flow is thrown automatically with the pressure-regulating valve in design, has avoided pressure oscillation and the unstable operation of the production that rear circulation ceaselessly fluctuateed need bring.After rear stable circulation, can also carry out good coupling work with front circulation, give in operation and bring very large facility, reduce the amount of labour; 5, the high-low pressure rectifying column adopts advanced high capacity tray (CTST) to be transformed, under the condition that fixture is constant in tower diameter and tower, only transform the purpose that tower tray has reached transformation, the abnormal conditions such as liquid flooding that exist in the heavy-duty service have been eliminated, and increased outer for the ammonia amount, meet the needs of low temperature washing device for methanol heavy-duty service, increased benefit.
The refrigeration system stable operation that native system is supporting to low-temperature rectisol and to meet the needs of production at high load significant.
The accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present utility model;
In figure, be: one-level absorber 1, separator 2, vavuum pump 3, tubing pump 4, ammonia vessel 5, rich solution pump 6, secondary absorber 7, rich solution groove 8, the first aqua ammonia pump 9, low-pressure distillation tower 10, low pressure desorption device 11, haustorium 12, concentrated ammonia liquor groove 13, the second aqua ammonia pump (14), high-pressure rectification tower 15 again, high pressure desorption device 16, ammonia condenser 17, ammonia condenser storage tank 18, fluid infusion ammonia pipeline 19, rear circular flow valve 20.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
As shown in Figure 1, a kind of ammonia absorption refrigeration system of optimization, comprise one-level absorber 1, the vavuum pump 3 be connected with one-level absorber 1, the separator 2 be connected with vavuum pump 3; Described one-level absorber 1 is connected with ammonia vessel 5 simultaneously, ammonia vessel 5 connects secondary absorber 7, secondary absorber 7 connects rich solution groove 8, rich solution groove 8 connects low-pressure distillation tower 10, and low-pressure distillation tower 10 connects haustorium 12 again, then haustorium 12 connecting fluid ammonia vessels 13, liquefied ammonia tank 13 connects high-pressure rectification tower 15, high-pressure rectification tower 15 connects ammonia condenser 17, and ammonia condenser 17 connects ammonia condenser storage tank 18, is provided with ammoniacal liquor exterior liquid pipeline on ammonia condenser storage tank 18; Be provided with rich solution pump 6 on the connecting pipe of ammonia vessel 5 and secondary absorber 7, be provided with the firstth aqua ammonia pump 9 on the pipeline between rich solution groove 8 and low-pressure distillation tower 10, be provided with the second aqua ammonia pump 14 on the pipeline between liquefied ammonia tank 13 and high-pressure rectification tower 15; It is characterized in that: be provided with fluid infusion ammonia pipeline 19 between described ammoniacal liquor exterior liquid pipeline and one-level absorber 1, on fluid infusion ammonia pipeline, be provided with control valve;
Be provided with tubing pump 4 on pipeline between described separator 2 and ammonia vessel 5, liquid level gauge on the spot is set on separator 2, solved the liquid in the separator and overflow to vacuum pump outlet, the problem that vavuum pump can't be moved; Guarantee the pressure of vacuum system, better for low temperature washing device for methanol, provide cold.
Described low-pressure distillation tower 10 bottoms are connected with one-level absorber 1 by pipeline, are respectively arranged with low pressure desorption device 11 and fluid level control valve on the pipeline between it, are provided with far transmission level meter and liquid level gauge on the spot on low pressure liquid level desorption device 11;
The bottom of described high-pressure rectification tower 15 is connected with haustorium 12 again by pipeline, is provided with high pressure desorption device 16 and rear circular flow valve 20 on the pipeline between it; Be provided with far transmission level meter and liquid level gauge on the spot on high pressure liquid level desorption device 16.
Fig. 1 is the parameter comparison of the high-low pressure rectifying column before and after transformation:
The liquefied ammonia dosing: original system is to adopt gas ammonia to be made into the solution of variable concentrations by the method for beating partial circulating, owing to there is no thermal source, ammonia volatilization is slower, affect the driving progress, dosing speed while driving in order to improve is connected the seamless steel pipe of a DN25 on the gas ammonia pipeline of outlet liquefied ammonia pipeline and one-level absorber, passes through the liquefied ammonia dosing during driving, absorb institute's liberated heat and remove by recirculated water, solved the slow problem of dosing.
Vacuumized part: former design vacuumized part is placed on one deck, and one-level absorption liquid storage tank is placed on two layers, the liquid of solution cooler can not flow to one-level absorption liquid storage tank well, result is that in cooler, liquid is unrestrained, overflow to vacuum pump outlet, stop up the ability of the outside exhaust of vavuum pump, cause vavuum pump to move; One liquid level gauge is installed on the cooler of vacuumized part, and add a tubing pump between cooler and one-level absorption cell, and the liquid in cooler is transported to the one-level absorption cell, avoid cooler liquid unrestrained, guarantee that vavuum pump normally moves, guaranteed the vacuum pressure of low-pressure section.
The high-low pressure desorption device: the evaporator designs under low-pressure distillation tower and high-pressure rectification is falling film evaporation, evaporation rate is fast, solution time of staying in evaporimeter is short, can not fully absorb the enthalpy heat of steam through the solution in evaporimeter, ammonia in solution can only partly evaporate, result is that pressure and the column bottom temperature of rectifying column tower top all do not reach the technic index of design, the column bottom temperature of low-pressure distillation tower is low, cause solution concentration high, the solution of high concentration is during as the absorption liquid of one-level absorber, according to the vapor liquid equilibrium principle, the gas ammonia come from low-temperature rectisol can not be completely absorbed, vacuum just can not finely maintain, the high-pressure rectification tower, because pressure is low, makes rectifying liquefied ammonia out can not be transported to well low-temperature rectisol, and low-temperature rectisol can not get enough colds, and whole system can't normally be moved, and load is carried to be come up.In order to take full advantage of the enthalpy heat of steam, change the evaporimeter under the high-low pressure rectifying column into the immersion evaporation by falling film type evaporation, and liquid level gauge and far transmission level meter on the spot are installed on evaporimeter, be convenient to control liquid level.Remove the liquid bath that is subject to below evaporimeter, the shell side outlet conduit of evaporimeter is designed to U-shaped, forms fluid-tight.And by the liquid level of outlet regulating valve regulation evaporimeter, the immersion evaporation has extended the time of contact of ammonia solution and thermal source, can make most of ammonia volatilization in ammonia solution out, control the concentration of ammonia solution by the control column bottom temperature.
Metacyclic modification of interlock, the pressure of low-pressure distillation tower is to control by the spray flux of haustorium again, when this interlocking is thrown when automatic, due to the liquid level shakiness of evaporimeter, temperature fluctuation, cause pressure oscillation frequent, spray flux fluctuates widely thereupon, and operating mode is very unstable.In order to guarantee the stability of system, the operation of handled easily work, the pressure of low-pressure distillation tower is regulated to the flow measuring point and the control valve that change the resorber absorption liquid into automatically to be thrown automatically, because the flow of absorption liquid is to be controlled by the pressure reduction of high-low pressure rectifying column, according to Bernoulli equation, the variation that is caused fluid velocity by the variation of pressure reduction is smaller, therefore flow measuring point and control valve are thrown automatically, whole system is more stable.
The column plate transformation of high-low pressure rectifying column, in design, the corresponding load of ammonia absorption refrigeration system is the 90083Nm3/h raw gas, when the load of raw gas surpasses 105000 Nm3/h, 500# rectisol system temperature T ICT037, TICT042 falls less than design load, and blowdown needs often to open always, and the blowdown temperature is-30 ℃～-34 ℃, the temperature of ammonia condenser storage tank B06 is 44 ℃, and ammonia purity is lower, and refrigeration is poor.When the raw gas load variations is larger, or the temperature of recirculated water, steam pressure be while having larger fluctuation, and the K02 tower very easily entrainment occurs and tower is general, and the rectisol system temperature rises very fast, and refrigeration is poorer.The generation explanation K02 output of column of this phenomenon is obviously not enough under higher load condition.According to the development of current tower tray technology and use for reference the result of relevant producer transformation, utilize CTST tower tray transformation low-pressure distillation tower, the high-pressure rectification tower, under the condition that fixture is constant in the towers such as tower diameter, tray spacing, tray stiffer, make bubble cap tray and " F " shape valve plate change the anti-blocking high capacity tray of "T"-shaped float valve into.
Above embodiment is only for illustrating preferred embodiment of the present utility model; but the utility model is not limited to above-mentioned embodiment; in the ken possessed at described field those of ordinary skill; it any modification of doing within spirit of the present utility model and principle, is equal to and substitutes and improvement etc., within all should be encompassed in the technical scheme scope that the utility model asks for protection.
Claims (4)
1. the ammonia absorption refrigeration system of an optimization, comprise one-level absorber (1), the vavuum pump (3) be connected with one-level absorber (1), the separator (2) be connected with vavuum pump (3), described one-level absorber (1) is connected with ammonia vessel (5) simultaneously, ammonia vessel (5) connects secondary absorber (7), secondary absorber (7) connects rich solution groove (8), rich solution groove (8) connects low-pressure distillation tower (10), low-pressure distillation tower (10) connects haustorium (12) again, haustorium (12) connecting fluid ammonia vessel (13) again, liquefied ammonia tank (13) connects high-pressure rectification tower (15), high-pressure rectification tower (15) connects ammonia condenser (17), ammonia condenser (17) connects ammonia condenser storage tank (18), be provided with ammoniacal liquor exterior liquid pipeline on ammonia condenser storage tank (18), be provided with rich solution pump (6) on the connecting pipe of ammonia vessel (5) and secondary absorber (7), be provided with the firstth aqua ammonia pump (9) on pipeline between rich solution groove (8) and low-pressure distillation tower (10), on the pipeline between liquefied ammonia tank (13) and high-pressure rectification tower (15), be provided with the second aqua ammonia pump (14), it is characterized in that: be provided with fluid infusion ammonia pipeline (19) between described ammoniacal liquor exterior liquid pipeline and one-level absorber (1), on fluid infusion ammonia pipeline, be provided with control valve.
2. the ammonia absorption refrigeration system of a kind of optimization according to claim 1, it is characterized in that: be provided with tubing pump (4) on the pipeline between described separator (2) and ammonia vessel (5), separator arranges liquid level gauge on the spot on (2).
3. the ammonia absorption refrigeration system of a kind of optimization according to claim 1, it is characterized in that: described low-pressure distillation tower (10) bottom is connected with one-level absorber (1) by pipeline, be respectively arranged with low pressure desorption device (11) and fluid level control valve on pipeline between it, be provided with far transmission level meter and liquid level gauge on the spot on low pressure liquid level desorption device (11).
4. the ammonia absorption refrigeration system of a kind of optimization according to claim 1, it is characterized in that: the bottom of described high-pressure rectification tower (15) is connected with haustorium (12) again by pipeline, is provided with high pressure desorption device (16) and rear circular flow valve (20) on the pipeline between it; Be provided with far transmission level meter and liquid level gauge on the spot on high pressure liquid level desorption device (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320363527.1U CN203385235U (en) | 2013-06-24 | 2013-06-24 | Optimized ammonia absorption refrigeration system |
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| CN201320363527.1U CN203385235U (en) | 2013-06-24 | 2013-06-24 | Optimized ammonia absorption refrigeration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110234941A (en) * | 2017-02-16 | 2019-09-13 | 日立江森自控空调有限公司 | Absorption refrigerating machine |
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2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110234941A (en) * | 2017-02-16 | 2019-09-13 | 日立江森自控空调有限公司 | Absorption refrigerating machine |
| CN110234941B (en) * | 2017-02-16 | 2021-05-18 | 日立江森自控空调有限公司 | Absorption refrigerator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140108 Termination date: 20140624 |
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| EXPY | Termination of patent right or utility model |