CN105157289A - Filling method of composite refrigerant for MRC refrigeration cycle - Google Patents
Filling method of composite refrigerant for MRC refrigeration cycle Download PDFInfo
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- CN105157289A CN105157289A CN201510649874.4A CN201510649874A CN105157289A CN 105157289 A CN105157289 A CN 105157289A CN 201510649874 A CN201510649874 A CN 201510649874A CN 105157289 A CN105157289 A CN 105157289A
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Abstract
The invention discloses a filling method of a composite refrigerant for an MRC refrigeration cycle. The problem that in an existing small liquefaction plant, the refrigerant filling method is complex is solved. The filling method of the composite refrigerant comprises the steps that the composite refrigerant is filled into the MRC refrigeration cycle, and all components of the composite refrigerant are filled into the MRC refrigeration cycle in a partial or full mixing mode, wherein the working process of the MRC refrigeration cycle comprises the steps that 1, the refrigerant is subjected to compression through a recycle compressor to be cooled and enters a separator to be separated into liquid and gas; 2, the separated liquid and gas enter a heat exchange system to supply refrigeration capacity for the outside; 3, the refrigerant passing through the heat exchange system returns to an inlet of the recycle compressor again to conduct compression. The filling method of the composite refrigerant for the MRC refrigeration cycle has the advantages that the operation steps are simplified, the requirements for operators are reduced, the input cost of equipment is reduced, the design is novel, and the effect is obvious.
Description
Technical field
The present invention relates to a kind of cryogen compensation process, what be specifically related to is a kind of fill method of MRC kind of refrigeration cycle compound cryogen.
Background technology
MRC kind of refrigeration cycle, refers to the circulation that the cold-producing medium in kind of refrigeration cycle is made up of Multiple components, is used for the application of liquefied natural gas.Natural gas liquefaction is the process that a temperature reduces gradually, needs the temperature of natural gas to be reduced to subzero about 160 DEG C.Adopt different refrigerating methods to liquefy to natural gas, its energy consumption is also different.Usually following several refrigerating method is had to liquefy to natural gas:
1, cascade refrigeration (liquefaction 1 mark side's natural gas design energy consumption about: 0.30KW.h);
2, MRC refrigeration (liquefaction 1 mark side's natural gas design energy consumption about: 0.35KW.h);
3, nitrogen swell refrigeration (liquefaction 1 mark side's natural gas design energy consumption about: 0.50KW.h);
4, natural gas jet refrigeration (liquefaction 1 mark side's natural gas calculating energy consumption about: 0.65KW.h).
Usually the refrigerating method adopted in the natural gas liquefaction device of ultra-large type (treating capacity is greater than 1,000,000 mark sides/sky) is cascade refrigeration.Usually the refrigerating method adopted in the natural gas liquefaction device in big-and-middle-sized (treating capacity 30-100 ten thousand side of marking/sky) is MRC refrigeration.Usually the refrigerating method adopted in the natural gas liquefaction device in little miniature (treating capacity 1-3 ten thousand side of marking/sky) is MRC refrigeration, nitrogen swell refrigeration or natural gas jet refrigeration.
The cryogen adopted in MRC refrigeration is compound cryogen, is both mixed by various ingredients.When the component of natural gas is identical with design load, each component actual ratio of compound cryogen is more close to each component design proportion of compound cryogen, and the actual consumption of its liquefaction 1 mark side's natural gas is close to design energy consumption.
For big-and-middle-sized natural gas liquefaction device, take a day output as the natural gas liquefaction device in 300,000 mark sides/sky, adopt the mode of MRC refrigeration to natural gas liquefaction, day design power consumption about 10.5 ten thousand KW.h.Energy consumption for cooling is often higher than design energy consumption 1%, then actual power consumption amount just consumes 1050KW.h more day.Therefore need each component actual ratio of compound cryogen each component design proportion that may be close to compound cryogen maximum to the greatest extent.Because in the process of refrigerant circulation, cold-producing medium can leak, therefore in the process run, needs supplementary cold-producing medium.In order to ensure each component design proportion that may be close to compound cryogen that each component actual ratio of compound cryogen is maximum to the greatest extent, need to arrange the component of cryogen in-line analyzer to cryogen to detect in real time, and also need each component to fill respectively in the process of filling cryogen, to facilitate, the actual ratio of each component is adjusted, in the process of each component actual ratio of adjustment compound cryogen, continuous print is needed repeatedly to adjust, because having a Delay Process (lag time from 3-8 hour not etc.) from filling the refrigerant components balance that cryogen is accomplished to the circulatory system, therefore the time of each filling cryogen is longer.And fill in the process of cryogen each, in the process of single adjustment, need operating personnel to calculate in conjunction with relevant operating modes such as each component actual ratio of compound cryogen and each component design proportion of compound cryogen, therefore require that the professional level of operating personnel is higher.In big-and-middle-sized natural gas liquefaction device, the price (about about 500,000) of cryogen in-line analyzer is minimum to entirety investment (about 2 about hundred million), and return the engineer of configuration specialty at big-and-middle-sized natural gas liquefaction device, therefore the professional level of operating personnel is higher.So it is useful in big-and-middle-sized natural gas liquefaction device, each component actual ratio of compound cryogen being use up the maximum each component design proportion that may be close to compound cryogen, and be easily realize.
For little miniature natural gas liquefaction device, for the natural gas liquefaction device that a day output is 30,000 mark sides/sky, adopt the mode of MRC refrigeration to natural gas liquefaction, day design power consumption about 1.05 ten thousand KW.h, adopt the mode of nitrogen swell refrigeration to natural gas liquefaction, day design power consumption about 1.5 ten thousand KW.h, adopts the mode of natural gas jet refrigeration to natural gas liquefaction, day design power consumption about 1.95 ten thousand KW.h.Because the price (about about 500,000) of cryogen in-line analyzer slightly affects entirety investment (about 2000 about ten thousand), and little miniature natural gas liquefaction device can not configure the engineer of specialty usually, therefore in little miniature natural gas liquefaction device, MRC refrigeration is adopted to be very difficult by most for each component actual ratio of the compound cryogen maximum each component design proportion that may be close to compound cryogen.Because the level of operating personnel is not high, when adopting existing MRC refrigeration-cycle operation method, even if each component actual ratio that operating personnel do not pursue compound cryogen uses up the maximum each component design proportion that may be close to compound cryogen, but ensureing that each component actual ratio of compound cryogen does not depart from each component design proportion of compound cryogen, this operation is also very difficult.Therefore in little miniature natural gas liquefaction device, owner, for actual conditions, can select operation more simple usually, but the mode of the higher nitrogen swell refrigeration of energy consumption or natural gas jet refrigeration.
In prior art, the concrete technology flow process of MRC kind of refrigeration cycle is as follows:
Cold-producing medium cooling after recycle compressor pressurization enters separator, and isolated liquid state and gaseous state enter respectively in heat-exchange system (ice chest) and carry out throttling, heat exchange, be separated etc. process externally provides cold.Cold-producing medium (state is gaseous state) after throttling turns back to recycle compressor entrance again and pressurizes.In the process of kind of refrigeration cycle, cold-producing medium can leak, therefore needs to supplement cold-producing medium to cooling cycle system in running.
In order to make MRC refrigerating method more adapt to little miniature natural gas liquefaction device, the method needing the cryogen freezed by MRC to fill becomes more simple, requires lower to the operant level of personnel.For reaching this object.Therefore each component design proportion that may be close to compound cryogen maximum to the greatest extent is no longer required for each component actual ratio of compound cryogen, but ensure that each component actual ratio does not depart from each component design proportion of compound cryogen.Although the actual consumption of MRC refrigerating method is higher than design energy consumption like this, operate easier, lower to the requirement of the operant level of operating personnel, therefore to do like this for little miniature natural gas liquefaction device be useful.
For achieving the above object, technical scheme of the present invention is as follows:
A fill method for MRC kind of refrigeration cycle compound cryogen, comprising:
Filled composite cryogen in MRC kind of refrigeration cycle, each component of this compound cryogen is filled in MRC kind of refrigeration cycle by the mode of partly or entirely mixing.Namely toward MRC kind of refrigeration cycle filled composite cryogen, this compound cryogen is mixed by each component Parts, all the other components press one-component, or each component grouping mixing, or the mode that each component all mixes is added in MRC kind of refrigeration cycle.
In the cold-producing medium of loss in MRC kind of refrigeration cycle the ratio of each constituent and the design proportion gap of cold-producing medium little, thus compound cryogen of the present invention adopts and will add in MRC kind of refrigeration cycle after each component Parts of cold-producing medium needing to add or whole mixing according to design proportion, calculate in conjunction with relevant operating modes such as each component actual ratio of compound cryogen and each component design proportion of compound cryogen in the process that this fill method adjusts at single without the need to operating personnel, reduce operating personnel's level requirement, anyone only need get final product complete operation according to operation requirements, without the need to having abundant operating experience, reduce the requirement of operating personnel, greatly reduce the input cost of operating personnel, this process simplify the filling step of cold-producing medium simultaneously, make operation simpler.
Due to without the need to detecting each component actual ratio of compound cryogen, thus detecting in real time without using the component of in-line analyzer to cryogen, the in-line analyzer in existing MRC cooling cycle system can be saved, save input cost.And each component of compound cryogen adds in MRC kind of refrigeration cycle again after mixing, thus effectively can cancel the equipment such as propane tank, pentane storage tank, ethene storage tank, make cryogen matching system more simple, equipment is optimized more, greatly saves equipment investment cost.
By testing small-sized SAPMAC method system, through experimental results demonstrate: after adopting the compound cryogen of design proportion to fill, its cryogen proportional jitter is also in allowed band, its energy consumption is only than adopting the method for single refrigerant charge to exceed 3 ~ 5%, but its energy consumption is still far below nitrogen swell refrigeration and natural gas jet refrigeration, and thus the filling of compound cryogen of the present invention still can be issued to the object of liquefied natural gas in the situation of less energy consumption.Meanwhile, when adding in MRC kind of refrigeration cycle after adopting various ingredients mixing, also considerably reduce the lag time of refrigerant components balance when one-component adds, reduce each time of filling cryogen; And due to after one-component interpolation, ratio off-design ratio in compound cryogen between each component is larger, and then cause energy consumption higher when one-component adds, and adopting the mode of each component Parts of compound cryogen or all rear interpolations of mixing, the adding procedure time used of this compound cryogen is shorter, energy consumption is lower.
Further, when filling cold-producing medium, cold-producing medium is divided into gaseous state cryogen and liquid refrigerant two groups according to state, and the component of liquid refrigerant is blending ingredients.
As the addition manner of optimum, internal circulating load liquid in stationary separator, when cold-producing medium in cooling cycle system occurs to leak, the liquid level of separator can decline, according to separator liquid level, filling liquid cryogen in MRC kind of refrigeration cycle.
Preferred as one, when filling cold-producing medium, the component of gaseous state cryogen is blending ingredients.
As the addition manner of optimum, described when cold-producing medium in cooling cycle system occurs to leak, recycle compressor inlet pressure can decline, and according to recycle compressor inlet pressure, in MRC kind of refrigeration cycle, fills gaseous state cryogen.
Further, the course of work of described MRC kind of refrigeration cycle is as follows:
(1) cold-producing medium cooling after recycle compressor pressurization enters separator, is separated into liquid state and gaseous state;
(2) isolated liquid state and gaseous state enter heat-exchange system respectively and externally provide cold;
(3) return to recycle compressor entrance through the cold-producing medium of heat-exchange system to pressurize.In MRC refrigerative circle system, mix refrigerant can leak, and needs to supplement, and because mix refrigerant is multicomponent composition, existing fill method is that one-component is filled respectively, and the present invention then adopts blending ingredients to fill; In this liquid refrigerant, each component is filled into MRC kind of refrigeration cycle from separator position, and in this gaseous state cryogen, each component is filled into MRC kind of refrigeration cycle from position, suction port of compressor.
As a kind of preferred arrangement, described liquid refrigerant is stored in mixing flow container, and in mixing flow container, liquid refrigerant is filled into MRC kind of refrigeration cycle from separator position again.
Further, the mixed liquor tank storage of described liquid refrigerant employing≤200L is deposited, and directly fills when needing.
The present invention compared with prior art, has the following advantages and beneficial effect:
1, the present invention adopts compound cryogen of the present invention to fill, and also simplify the step of filling, makes operation more simple, thus effectively reduces the level requirement of operating personnel, reduce operating personnel's input cost;
2, each component Parts of compound cryogen of the present invention or the design of all filling, not only efficiently solves operating difficulties, operating personnel requires high problem; Also effectively can cancel the equipment such as cryogen in-line analyzer, propane tank, pentane storage tank, ethene storage tank, make cryogen matching system more simple, equipment is optimized more, greatly saves equipment investment cost;
3, the present invention is novel in design, and Be very effective is with low cost, easy to operate, is applicable to very much applying.
Summary of the invention
The object of the invention is to overcome existing coolant filling method too complicated, high problem is required to operating personnel; There is provided a kind of equipment investment cost low, easy and simple to handle and the fill method of ordinary person's also operable MRC kind of refrigeration cycle compound cryogen.
Accompanying drawing explanation
Fig. 1 is the refrigerant cycle schematic diagram of embodiment 1.
Fig. 2 is the refrigerant cycle schematic diagram of embodiment 2.
Fig. 3 is the refrigerant cycle schematic diagram of embodiment 3.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
The course of work of MRC kind of refrigeration cycle, as shown in Figure 1, comprises the following steps:
(1) cold-producing medium cooling after recycle compressor pressurization enters separator, is separated into liquid state and gaseous state;
(2) isolated liquid state and gaseous state enter heat-exchange system respectively and externally provide cold;
(3) return to recycle compressor entrance through the cold-producing medium of heat-exchange system to pressurize.
Constituent and the design proportion of the cold-producing medium in the present embodiment in this MRC kind of refrigeration cycle are: nitrogen 9.5%, methane 18.5%, propane 29%, pentane 13%, ethene 30%; Aforementioned proportion is with molar percent.
Described compound cryogen, when filling cold-producing medium, is made up of liquid refrigerant and gaseous state cryogen, and in the present embodiment, this liquid refrigerant is made up of the mixing of propane, pentane and ethene, and this gaseous state cryogen is made up of nitrogen and methane.By propane, pentane, ethene according to after the mixing of cold-producing medium design proportion, load in the mixing flow container of 15L in liquid form after mixing; After nitrogen and methane are mixed according to cold-producing medium design proportion, load in a gaseous form in mixing gas tank.
Because in mixing flow container, liquid refrigerant is easily gasificated into gaseous state, thus mixing flow container internal memory is having minimum gas, and mixes pressure store and the temperature correlation of liquid refrigerant in flow container, 20 DEG C time, pressure store is 23bar, and 40 DEG C time, pressure store is 33bar.
In the present invention, the concrete filling process of compound cryogen is as follows:
In refrigerative circle system, the flow of coolant liquid is fixed according to operating load, and the flow detection point of this coolant liquid is positioned at F point.
When refrigerative circle system cold-producing medium occurs to leak, the recycle compressor inlet pressure of P point position declines, and by P point place pressure with to mix gas tank outlet regulating valve chain, and then guarantee P point place pressure maintains setting value.After mixing gas tank constantly supplements to cooling cycle system, in mixing gas tank, the pressure of gaseous state cryogen can decline gradually, when mixing the hypotony in gas tank and being not enough to supplement to cooling cycle system, is again added to by gaseous state cryogen in mixing gas tank.
Meanwhile, when refrigerative circle system cold-producing medium occurs to leak, the separator liquid level of L point position declines, and now, is filled with cooling cycle system, namely from Fig. 1,1. fills canned liquid refrigerant by the liquid refrigerant of splendid attire in mixing flow container from separator position.Pressure because of separator place is 30bar, and is having minimum gas due to mixing flow container internal memory, therefore is filled with after in cooling cycle system by the liquid refrigerant in mixing flow container and goes back remnant gas in tank.For the component in mixing flow container all being added in cooling cycle system as far as possible, thus after the liquid refrigerant in mixing flow container is filled with cooling cycle system, residual gas component in mixing flow container is added in the cold-producing medium after heat exchange again, namely be filled into the 2. position in Fig. 1, finally return to recycle compressor entrance again.
After being filled by the cryogen of method to MRC kind of refrigeration cycle of above-described embodiment, the every natural gas institute subfam. Spiraeoideae incomparably of average liquefaction is 3624KW.h.
Embodiment 2
The difference of the present embodiment and embodiment 1 is: in the present embodiment, and nitrogen and methane are packed in suction port of compressor respectively, as shown in Figure 2.
In the present embodiment, the concrete filling process of this compound cryogen is as follows:
In refrigerative circle system, the flow of coolant liquid is fixed according to operating load, and the flow detection point of this coolant liquid is positioned at F point.
When refrigerative circle system cold-producing medium occurs to leak, the recycle compressor inlet pressure of P point position declines, and when P point pressure drops to a certain degree, according to calculating magnitude of recruitment, supplements methane and nitrogen respectively in cooling cycle system.
Meanwhile, when refrigerative circle system cold-producing medium occurs to leak, the separator liquid level of L point position declines, and now, is filled with cooling cycle system, namely from Fig. 1,1. fills canned liquid refrigerant by the liquid refrigerant of splendid attire in mixing flow container from separator position.Pressure because of separator place is 30bar, and is having minimum gas due to mixing flow container internal memory, therefore is filled with after in cooling cycle system by the liquid refrigerant in mixing flow container and goes back remnant gas in tank.For the component in mixing flow container all being added in cooling cycle system as far as possible, thus after the liquid refrigerant in mixing flow container is filled with cooling cycle system, residual gas component in mixing flow container is added in the cold-producing medium after heat exchange again, namely be filled into the 2. position in Fig. 1, finally return to recycle compressor entrance again.
After being filled by the cryogen of method to MRC kind of refrigeration cycle of above-described embodiment, the every natural gas institute subfam. Spiraeoideae incomparably of average liquefaction is 3681KW.h.
Embodiment 3
The difference of the present embodiment and embodiment 1 is: in the present embodiment, be filled in mixing tank body after liquid refrigerant and the mixing of gaseous state cryogen, be packed into MRC kind of refrigeration cycle from mixing tank body again, thus mix the admixture certainly existing gas and liquid in tank body, concrete filling mode is:
When refrigerative circle system cold-producing medium occurs to leak, the recycle compressor inlet pressure of P point position declines, when P point pressure drops to a certain degree, by mixing tank body to make-up gas in cooling cycle system.
Meanwhile, when refrigerative circle system cold-producing medium occurs to leak, the separator liquid level of L point position declines, and now, is filled with cooling cycle system, namely from Fig. 1,1. fills canned liquid refrigerant by the liquid refrigerant of splendid attire in mixing tank body from separator position.
After being filled by the cryogen of method to MRC kind of refrigeration cycle of above-described embodiment, the every natural gas institute subfam. Spiraeoideae incomparably of liquefaction is 3598KW.h.
Embodiment 4
The comparative example of the present embodiment and embodiment 1, what the present embodiment adopted is the method each component of the compound cryogen of design proportion added to respectively one by one in MRC kind of refrigeration cycle.
After being filled by the cryogen of method to MRC kind of refrigeration cycle of above-described embodiment, the every natural gas institute subfam. Spiraeoideae incomparably of liquefaction is 3852KW.h.
In sum, the energy consumption cost that the inventive method exceeds can be offset by the input cost reducing operating personnel completely, thus adopts the inventive method greatly to save the input cost of equipment.
Above-described embodiment is only the preferred embodiments of the present invention, not limiting the scope of the invention, as long as adopt design principle of the present invention, and the change carried out non-creativeness work on this basis and make, all should belong within protection scope of the present invention.
Claims (8)
1. a MRC kind of refrigeration cycle fill method for compound cryogen, is characterized in that, comprising:
Filled composite cryogen in MRC kind of refrigeration cycle, each component of this compound cryogen is filled in MRC kind of refrigeration cycle by the mode of partly or entirely mixing.
2. the fill method of a kind of MRC kind of refrigeration cycle compound cryogen according to claim 1, is characterized in that, when filling cold-producing medium, cold-producing medium is divided into gaseous state cryogen and liquid refrigerant two groups according to state,
The component of liquid refrigerant is blending ingredients.
3. the fill method of a kind of MRC kind of refrigeration cycle compound cryogen according to claim 2, it is characterized in that, the internal circulating load of separator middle outlet liquid refrigerant is kept definite value, when the cold-producing medium in MRC cooling cycle system occurs to leak, in this system, the liquid level of separator can decline, according to separator liquid level, filling liquid cryogen in MRC kind of refrigeration cycle.
4. the fill method of a kind of MRC kind of refrigeration cycle compound cryogen according to claim 2, is characterized in that, when filling cold-producing medium, the component of gaseous state cryogen is blending ingredients.
5. the fill method of a kind of MRC kind of refrigeration cycle compound cryogen according to claim 4, it is characterized in that, it is described when cold-producing medium in MRC cooling cycle system occurs to leak, recycle compressor inlet pressure in this system can decline, according to recycle compressor inlet pressure, in MRC kind of refrigeration cycle, fill gaseous state cryogen.
6. the fill method of a kind of MRC kind of refrigeration cycle compound cryogen according to any one of claim 2-5, it is characterized in that, the course of work of described MRC kind of refrigeration cycle is as follows:
(1) cold-producing medium cooling after recycle compressor pressurization enters separator, is separated into liquid state and gaseous state;
(2) isolated liquid state and gaseous state enter heat-exchange system respectively and externally provide cold;
(3) return to recycle compressor entrance through the cold-producing medium of heat-exchange system to pressurize.
7. the fill method of a kind of MRC kind of refrigeration cycle compound cryogen according to claim 6, is characterized in that, described liquid refrigerant is stored in mixing flow container, and in mixing flow container, liquid refrigerant is filled into MRC kind of refrigeration cycle from separator position again.
8. the fill method of a kind of MRC kind of refrigeration cycle compound cryogen according to claim 7, it is characterized in that, the mixed liquor tank storage of described liquid refrigerant employing≤200L is deposited.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107436072A (en) * | 2017-08-14 | 2017-12-05 | 新地能源工程技术有限公司 | Natural gas liquefaction system and method with refrigerant supplementary device |
| CN110736185A (en) * | 2019-09-10 | 2020-01-31 | 杭州睿桦节能科技有限公司 | Safety control program for R32R290 refrigerant air conditioner and production process thereof |
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Application publication date: 20151216 |