CN204369829U - A kind of energy-saving coal preparing natural gas system - Google Patents
A kind of energy-saving coal preparing natural gas system Download PDFInfo
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- CN204369829U CN204369829U CN201520010410.4U CN201520010410U CN204369829U CN 204369829 U CN204369829 U CN 204369829U CN 201520010410 U CN201520010410 U CN 201520010410U CN 204369829 U CN204369829 U CN 204369829U
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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
The utility model belongs to eco-friendly power source technical field, discloses a kind of energy-saving coal preparing natural gas system.Described system comprises coal gasification unit, converter unit, low-temperature rectisol unit and methanation unit, between described low-temperature rectisol unit and methanation unit, absorption type refrigerating unit is set, described absorption type refrigerating unit carries out driving refrigeration, for low-temperature rectisol unit provides cold with the low temperature exhaust heat produced in methanation unit.Absorption type refrigerating unit of the present utility model, realizes the low temperature exhaust heat in methanation unit to utilize, and in low-temperature rectisol unit, replaces Partial shrinkage formula refrigeration, improves energy utilization efficiency, decrease the use of recirculated water.
Description
Technical field
The utility model belongs to eco-friendly power source technical field, is specifically related to a kind of energy-saving coal preparing natural gas system.
Background technology
Natural Gas In China consumption is in recent years in quick growing trend, and within 2008, domestic natural gas Apparent con-sumption reaches 78,900,000,000 Nm
3.Natural gas consumption structure is also being continued to optimize, and gas and generating gas obviously increase, and industrial fuel and industrial chemicals gas gradually reduce.Before the year two thousand twenty, Natural Gas In China consumption breach will reach 1075 ~ 1,765 hundred million Nm
3/ a.At home in the nervous and international oil price of natural gas supply, Gas Prices rise situation continuously, sight is turned to the project with coal production Sweet natural gas by domestic many companies.Since 2013, National Development and Reform Committee accelerates the examination & approval speed to coal preparing natural gas, and have 17 gas maked coal projects to obtain National Development and Reform Committee's " travel permit " successively, project is distributed in Xinjiang, the Inner Mongol, Shanxi and Anhui, aggregated capacity is more than 70,000,000,000 sides/year, and gross investment guestimate is more than 4,000 hundred million yuan.By the end of the end of the year 2014, will add up to close to 9,000,000,000 side's production capacity gas maked coal project endings, close to operation state.Add Datang gram flag first phase 13.3 hundred million side's gas maked coal project and Xinjiang celebrating China 13.75 hundred million side's gas maked coal projects of within 2013, going into operation, be estimated to for the end of the year 2014, the supply production capacity of CHINESE COAL preparing natural gas will be expected to " spurt " 10,000,000,000 cubes.
Coal preparing natural gas refers to that coal produces synthetic gas through gasification, then through methanation reaction, production synthetic natural gas (SNG).Coal preparing natural gas typical systems comprises: standby coal, empty point, dry, the SNG of gasification, wastewater treatment, conversion, purification, sulfur recovery, methanation, pressurization, SNG carries.Coal to SNG can utilize China compared with the coal resources of horn of plenty, especially low-grade coal high-efficiency cleaning, produces domestic energy starved Sweet natural gas, is then incorporated to the long defeated pipe network of existing Sweet natural gas; Recycle existing natural gas line and NGCC power plant.Part attitude is certainly held in the overall development of coal preparing natural gas, but its process efficiency is not high, low temperature exhaust heat is not effectively utilized, final major part all emits with the form of low-temperature water heating, cause a large amount of wastes of energy like this, making full use of these residual heat resources is one of main contents of coal preparing natural gas industry energy conservation.
Low temperature exhaust heat refers to the flue gas of temperature lower than 200 DEG C and the liquid lower than 100 DEG C.Its way of recycling is various, but is totally divided into the large class of recovery of heat and power recovery two, and wherein recovery of heat refers to and directly utilizes heat energy, and power recovery refers to and is converted to power or electric power is used again.Meanwhile, in gas maked coal system, there is a lot of unit processes to need to cool material or product, need the cold of a large amount of different taste.At present, produce the mode of these cold many employings mechanical compression refrigerations, thus consume the electric energy of a large amount of high-quality.
Utility model content
In order to solve the shortcoming and defect part of above prior art, the purpose of this utility model is to provide a kind of energy-saving coal preparing natural gas system.This system, while the utilising efficiency increasing energy, can also reduce the consumption of recirculated water.
The utility model object is achieved through the following technical solutions:
A kind of energy-saving coal preparing natural gas system, comprise the coal gasification unit, converter unit, low-temperature rectisol unit and the methanation unit that connect successively, between described low-temperature rectisol unit and methanation unit, absorption type refrigerating unit is set, this absorption type refrigerating unit is by the connection with methanation unit and low-temperature rectisol unit, can realize carrying out with the low temperature exhaust heat that methanation unit produces drivings to freeze, and cold is delivered to low-temperature rectisol unit and be used for cooling methyl alcohol.
Described absorption type refrigerating unit comprises ammonia absorption type refrigeration plant and lithium bromide water absorption refrigerating plant; Described ammonia absorption type refrigeration plant comprises ammonia soln rectifying tower, ammonia condenser, supercooler, ammonia soln storage tank, ammonia soln interchanger, ammonia soln reducing valve, cryogen ammonia scrubber and ammonia soln recycle pump; Described lithium bromide water absorption refrigerating plant comprises lithium-bromide solution producer, steam condenser, water throttling valve, water evaporimeter, water as refrigerant vapor absorber, lithium-bromide solution storage tank, lithium-bromide solution interchanger, lithium-bromide solution reducing valve and lithium-bromide solution pump, ammonia soln rectifying tower tower top is connected with supercooler with ammonia condenser successively, and supercooler is connected respectively to the shell of low-temperature rectisol unit and cryogen ammonia scrubber; Be connected with the shell side of cryogen ammonia scrubber with ammonia soln storage tank, ammonia soln interchanger, ammonia soln reducing valve successively at the bottom of ammonia soln rectifying tower; The shell-side outlet of cryogen ammonia scrubber connects the stripping section bottom of ammonia soln recycle pump, ammonia soln interchanger and ammonia soln rectifying tower successively; Lithium-bromide solution producer top is connected with the import of steam condenser, water throttling valve, water evaporimeter, water as refrigerant vapor absorber successively; Be connected with the import of water as refrigerant vapor absorber with lithium-bromide solution storage tank, lithium-bromide solution interchanger, lithium-bromide solution reducing valve successively bottom lithium-bromide solution producer; The outlet of water as refrigerant vapor absorber connects lithium-bromide solution pump successively, lithium-bromide solution interchanger is connected with the import of lithium-bromide solution producer; Ammonia soln rectifying tower is connected with methanation unit respectively with lithium-bromide solution producer; Water evaporimeter, ammonia condenser, cryogen ammonia scrubber and low-temperature rectisol unit are in turn connected to form circulation loop.
System tool of the present utility model has the following advantages and beneficial effect:
(1) a kind of energy-saving coal preparing natural gas system of the present utility model is by arranging absorption type refrigerating unit between low-temperature rectisol unit and methanation unit, the low temperature exhaust heat that absorption type refrigerating unit can utilize methanation unit to produce carries out driving refrigeration, for low-temperature rectisol unit provides cold, improve energy utilization efficiency;
(2) a kind of energy-saving coal preparing natural gas system of the present utility model arranges circulation loop between low-temperature rectisol unit and absorption type refrigerating unit, the recycle of water in low-temperature rectisol unit and absorption type refrigerating unit can be realized, there is significant water-saving result.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of the utility model embodiment 1;
Fig. 2 is the refrigerating device structure schematic diagram of the utility model embodiment 1;
In figure, mark is described as follows: 1-ammonia soln rectifying tower, 2-ammonia condenser, 3-supercooler, 4-ammonia soln storage tank, 5-ammonia soln interchanger, 6-ammonia soln reducing valve, 7-cryogen ammonia scrubber, 8-ammonia soln recycle pump, 9-lithium-bromide solution producer, 10-steam condenser, 11-water throttling valve, 12-water evaporimeter, 13-water as refrigerant vapor absorber, 14-lithium-bromide solution storage tank, 15-lithium-bromide solution interchanger, 16-lithium-bromide solution reducing valve, 17-lithium-bromide solution pump, 18-coal gasification unit, 19-converter unit, 20-low-temperature rectisol unit, 21-methanation unit, 22-ammonia absorption type refrigeration plant, 23-lithium bromide water absorption refrigerating plant.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
Embodiment 1
A kind of energy-saving coal preparing natural gas system of the present embodiment, as shown in Figure 1, comprise coal gasification unit 18, converter unit 19, low-temperature rectisol unit 20 and methanation unit 21, ammonia absorption type refrigeration plant 22 and lithium bromide water absorption refrigerating plant 23 are set between low-temperature rectisol unit and methanation unit; As shown in Figure 2, described ammonia absorption type refrigeration plant comprises ammonia soln rectifying tower 1, ammonia condenser 2, supercooler 3, ammonia soln storage tank 4, ammonia soln interchanger 5, ammonia soln reducing valve 6, cryogen ammonia scrubber 7 and ammonia soln recycle pump 8 to the structural representation of described ammonia absorption type refrigeration plant and lithium bromide water absorption refrigerating plant; Described lithium bromide water absorption refrigerating plant comprises lithium-bromide solution producer 9, steam condenser 10, water throttling valve 11, water evaporimeter 12, water as refrigerant vapor absorber 13, lithium-bromide solution storage tank 14, lithium-bromide solution interchanger 15, lithium-bromide solution reducing valve 16 and lithium-bromide solution pump 17, ammonia soln rectifying tower tower top is connected with supercooler with ammonia condenser successively, and supercooler is connected respectively to the shell of low-temperature rectisol unit and cryogen ammonia scrubber; Be connected with the shell side of cryogen ammonia scrubber with ammonia soln storage tank, ammonia soln interchanger, ammonia soln reducing valve successively at the bottom of ammonia soln rectifying tower; The shell-side outlet of cryogen ammonia scrubber connects the stripping section bottom of ammonia soln recycle pump, ammonia soln interchanger and ammonia soln rectifying tower successively; Lithium-bromide solution producer top is connected with the import of steam condenser, water throttling valve, water evaporimeter, water as refrigerant vapor absorber successively; Be connected with the import of water as refrigerant vapor absorber with lithium-bromide solution storage tank, lithium-bromide solution interchanger, lithium-bromide solution reducing valve successively bottom lithium-bromide solution producer; The outlet of water as refrigerant vapor absorber connects lithium-bromide solution pump successively, lithium-bromide solution interchanger is connected with the import of lithium-bromide solution producer; Water evaporimeter, ammonia condenser, cryogen ammonia scrubber and low-temperature rectisol unit are in turn connected to form circulation loop.
The concrete process of refrigeration of the absorption type refrigerating unit of the present embodiment is: (1) concentrated ammonia solution enters in the stripping section bottom of ammonia soln rectifying tower, weak ammonia is obtained at the bottom of tower, tower top obtains ammonia, tower bottom reboiler thermal source is the low temperature exhaust heat produced in methanation unit, and in tower top ammonia condenser, cold water is the refrigerated water that lithium bromide water absorption refrigerating plant is produced; Tower top ammonia is after ammonia condenser is condensed, liquefied ammonia cryogen is produced through the decompression of ammoniacal liquor throttling valve, liquefied ammonia cryogen enters sweat cooling in low-temp methanol washing process after cooler is lowered the temperature again, for low-temperature rectisol unit provides cold, refrigerant vapour is got back in supercooler, cool post-decompression liquefied ammonia cryogen, then enter cryogen ammonia scrubber; Dilute ammonia solution at the bottom of tower is lowered the temperature by ammonia soln interchanger, again after the decompression of ammonia soln reducing valve, enter cryogen ammonia scrubber absorption refrigerant vapour and obtain strong aqua, cryogen ammonia scrubber adopts from the refrigerated water cooling in tower top ammonia condenser, strong aqua in cryogen ammonia scrubber pressurizes through ammonia soln recycle pump, after heating up in ammonia soln interchanger, enter ammonia soln rectifying tower middle and lower part and circulate; (2) bromize lithium dilute solution enters lithium-bromide solution producer, lithium-bromide solution producer thermal source is by the sequential driving of low temperature exhaust heat from ammonia soln rectifying tower bottom reboiler, the water vapor produced is by the circulating cooling water condensation from low-temperature rectisol operation, reduce pressure by throttling valve, evaporator evaporation is delivered to after forming cryogenic coolant water, produce refrigerated water, first this refrigerated water delivers to ammonia condenser in ammonia absorption type refrigeration plant and cryogen ammonia scrubber as low-temperature receiver, then enters in low-temperature rectisol operation to be used for refrigeration cycle methyl alcohol; Water as refrigerant steam after evaporation enters water as refrigerant vapor absorber and absorbs, and absorption operation temperature is by circulating cooling water management; Strong solution at the bottom of lithium-bromide solution producer tower is through lithium-bromide solution reducing valve, again through lithium-bromide solution interchanger, enter the water as refrigerant steam that water as refrigerant vapor absorber absorbs flash-pot, generate bromize lithium dilute solution, bromize lithium dilute solution is after lithium-bromide solution interchanger heats up, and pumped back lithium-bromide solution producer circulates.
Above-described embodiment is the utility model preferably embodiment; but embodiment of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from spirit of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection domain of the present utility model.
Claims (2)
1. an energy-saving coal preparing natural gas system, comprise the coal gasification unit, converter unit, low-temperature rectisol unit and the methanation unit that connect successively, it is characterized in that: between described low-temperature rectisol unit and methanation unit, absorption type refrigerating unit is set, this absorption type refrigerating unit is connected with methanation unit and methanol wash column unit respectively, and the connection of absorption type refrigerating unit and methanation unit can realize the low temperature exhaust heat that methanation unit produces and enter absorption type refrigerating unit; The connection of absorption type refrigerating unit and low-temperature rectisol unit can realize the cold that absorption type refrigerating unit produces and be delivered to low-temperature rectisol unit for cooling methyl alcohol.
2. a kind of energy-saving coal preparing natural gas system according to claim 1, is characterized in that: described absorption type refrigerating unit comprises ammonia absorption type refrigeration plant and lithium bromide water absorption refrigerating plant; Described ammonia absorption type refrigeration plant comprises ammonia soln rectifying tower, ammonia condenser, supercooler, ammonia soln storage tank, ammonia soln interchanger, ammonia soln reducing valve, cryogen ammonia scrubber and ammonia soln recycle pump; Described lithium bromide water absorption refrigerating plant comprises lithium-bromide solution producer, steam condenser, water throttling valve, water evaporimeter, water as refrigerant vapor absorber, lithium-bromide solution storage tank, lithium-bromide solution interchanger, lithium-bromide solution reducing valve and lithium-bromide solution pump, ammonia soln rectifying tower tower top is connected with supercooler with ammonia condenser successively, and supercooler is connected respectively to the shell of low-temperature rectisol unit and cryogen ammonia scrubber; Be connected with the shell side of cryogen ammonia scrubber with ammonia soln storage tank, ammonia soln interchanger, ammonia soln reducing valve successively at the bottom of ammonia soln rectifying tower; The shell-side outlet of cryogen ammonia scrubber connects the stripping section bottom of ammonia soln recycle pump, ammonia soln interchanger and ammonia soln rectifying tower successively; Lithium-bromide solution producer top is connected with the import of steam condenser, water throttling valve, water evaporimeter, water as refrigerant vapor absorber successively; Be connected with the import of water as refrigerant vapor absorber with lithium-bromide solution storage tank, lithium-bromide solution interchanger, lithium-bromide solution reducing valve successively bottom lithium-bromide solution producer; The outlet of water as refrigerant vapor absorber connects lithium-bromide solution pump successively, lithium-bromide solution interchanger is connected with the import of lithium-bromide solution producer; Ammonia soln rectifying tower is connected with methanation unit respectively with lithium-bromide solution producer; Water evaporimeter, ammonia condenser, cryogen ammonia scrubber and low-temperature rectisol unit are in turn connected to form circulation loop.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646150A (en) * | 2022-03-25 | 2022-06-21 | 中山大学 | Tower top waste heat recycling cooling system and cooling method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646150A (en) * | 2022-03-25 | 2022-06-21 | 中山大学 | Tower top waste heat recycling cooling system and cooling method thereof |
| CN114646150B (en) * | 2022-03-25 | 2023-02-03 | 中山大学 | Tower top waste heat recycling cooling system and cooling method thereof |
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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: 20150603 Termination date: 20180105 |
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| CF01 | Termination of patent right due to non-payment of annual fee |