CN116838940A - LNG gasification system utilizing waste heat of exhaust-heat boiler flue gas - Google Patents
LNG gasification system utilizing waste heat of exhaust-heat boiler flue gas Download PDFInfo
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- CN116838940A CN116838940A CN202310927602.0A CN202310927602A CN116838940A CN 116838940 A CN116838940 A CN 116838940A CN 202310927602 A CN202310927602 A CN 202310927602A CN 116838940 A CN116838940 A CN 116838940A
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- CN
- China
- Prior art keywords
- lng
- waste heat
- heat exchanger
- heat
- flue gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000002918 waste heat Substances 0.000 title claims abstract description 68
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000003546 flue gas Substances 0.000 title claims abstract description 32
- 238000002309 gasification Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003507 refrigerant Substances 0.000 claims abstract description 37
- 239000006200 vaporizer Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000008016 vaporization Effects 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 9
- 238000009834 vaporization Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 26
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 239000003345 natural gas Substances 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000001273 butane Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
- F17C9/04—Recovery of thermal energy
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an LNG gasification system utilizing waste heat of exhaust-heat boiler flue gas, wherein flue gas from gas turbine exhaust enters an exhaust-heat boiler flue, and is discharged into the atmosphere from a chimney after being cooled by an evaporator, an economizer and a waste heat utilization heat exchanger in sequence; water flows into a water pump from a water storage tank, enters a first heat exchanger for cooling after pressure rise, flows into a waste heat utilization heat exchanger for absorbing heat and heating, and flows into the water storage tank; the refrigerant working medium is boosted from the refrigerant storage tank through the refrigerant pump, enters the first heat exchanger for heating, and then enters the second heat exchanger for heat exchange with LNG; LNG flows out of the LNG storage tank and then is divided into two paths, one path of LNG enters the LNG vaporizer, the other path of LNG enters the second heat exchanger for heating and vaporizing, and the LNG after the two paths of vaporization is mixed and then enters the auxiliary heater and the temperature of the LNG is adjusted to the temperature required by the system. According to the invention, the flue gas heat of the waste heat boiler which is originally directly discharged to the atmosphere is introduced into the LNG gasification process, so that the high-temperature exhaust waste heat utilization of the waste heat boiler is realized.
Description
Technical Field
The invention belongs to the technical field of energy utilization, and particularly relates to an LNG gasification system utilizing waste heat of flue gas of a waste heat boiler.
Background
LNG is a low-temperature liquid mixture formed by the dehydration and desulfurization treatment of natural gas and the freezing and liquefying of the natural gas through a low-temperature process, and the temperature is about 162 ℃ below zero. The LNG supply station needs to gasify LNG in a low-temperature liquid state into natural gas by an LNG vaporizer before supplying the natural gas to a user. Typical forms of LNG vaporizers are submerged combustion vaporizers, integral vaporizers, water-bath vaporizers, etc., wherein both submerged combustion vaporizers and integral vaporizers use natural gas as fuel, and the heat energy released in the natural gas combustion process is used for LNG vaporization; while the heat source of the water bath gasifier provides heat for circulating hot water, electricity or steam. Thus, LNG requires a large consumption of fossil energy in a typical gasification process.
The main equipment of the gas-steam combined cycle unit consists of a gas turbine, a waste heat boiler and a steam turbine, and the main heat-power conversion process is as follows: natural gas and air are combusted in a gas turbine and subjected to heat power conversion to form high-temperature flue gas which is discharged into a waste heat boiler, water absorbs the heat of the flue gas in the waste heat boiler to generate steam and then enters the turbine to apply work, and the flue gas flows out of the waste heat boiler and is discharged into the atmosphere after passing through a chimney. At present, the exhaust gas temperature of the exhaust-heat boiler of the large-sized gas-steam combined cycle unit is generally higher than 80 ℃, the exhaust gas flow exceeds 2000t/h (the gas-steam combined cycle unit with the grade higher than F), and the exhaust gas waste heat utilization potential of the exhaust-heat boiler is huge.
The gas-steam combined cycle unit is a consumer of natural gas. However, at present, an energy-saving system which has reasonable design and can not only utilize the flue gas waste heat of the waste heat boiler, but also reduce the fossil energy consumption in the LNG gasification process is not available.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an LNG gasification system utilizing waste heat of exhaust-heat boiler flue gas, which is reasonable in design, can utilize waste heat of exhaust-heat boiler flue gas and reduce consumption of fossil energy in the LNG gasification process.
The invention is realized by adopting the following technical scheme:
an LNG gasification system utilizing exhaust heat boiler flue gas waste heat, comprising: the system comprises an evaporator, an economizer, a waste heat utilization heat exchanger, a chimney, a waste heat boiler flue, a water pump, a water storage tank, a first heat exchanger, a refrigerant pump, a refrigerant storage tank, a second heat exchanger, an LNG storage tank, an LNG gasifier and an auxiliary heater;
flue gas from the exhaust of the gas turbine enters a flue of the waste heat boiler, and is discharged into the atmosphere from a chimney after being cooled by an evaporator, an economizer and a waste heat utilization heat exchanger in sequence;
water flows into a water pump from a water storage tank, enters a first heat exchanger for cooling after pressure rise, flows into a waste heat utilization heat exchanger for absorbing heat and heating, and flows into the water storage tank;
the refrigerant working medium is boosted from the refrigerant storage tank through the refrigerant pump, enters the first heat exchanger for heating, and then enters the second heat exchanger for heat exchange with LNG;
LNG flows out of the LNG storage tank and then is divided into two paths, one path of LNG enters the LNG vaporizer, the other path of LNG enters the second heat exchanger for heating and vaporizing, and the LNG after the two paths of vaporization is mixed and then enters the auxiliary heater and the temperature of the LNG is adjusted to the temperature required by the system.
A further development of the invention consists in that the flow of water in the first heat exchanger and the waste heat utilization heat exchanger is regulated by means of a first regulating valve.
The invention is further improved in that the first regulating valve can ensure that the pipe wall temperature of the waste heat utilization heat exchanger is not lower than the acid dew point of the flue gas.
The invention is further improved in that water is circulated between the water storage tank, the water pump, the first heat exchanger and the waste heat utilizing heat exchanger.
The invention is further improved in that the flow of the refrigerant working medium in the second heat exchanger and the first heat exchanger is regulated by the second regulating valve.
The invention is further improved in that refrigerant working medium forms refrigerant circulation among the refrigerant storage tank, the refrigerant pump, the first heat exchanger and the second heat exchanger.
The invention is further improved in that the refrigerant working medium is selected from light hydrocarbon mixtures.
The invention is further improved in that the LNG is fed to the LNG vaporizer after passing through the third regulator valve.
The invention is further improved in that LNG enters the second heat exchanger to be heated and gasified after passing through the fourth regulating valve.
The invention is further improved in that the LNG vaporizer is a submerged combustion vaporizer, an integral vaporizer, or a water bath vaporizer.
The invention has at least the following beneficial technical effects:
according to the invention, the exhaust-heat boiler flue gas heat which is originally directly discharged to the atmosphere is introduced into the LNG gasification process, so that the high-temperature exhaust waste heat utilization of the exhaust-heat boiler is realized, the energy consumption in the LNG gasification process is replaced, and the energy-saving effect of fossil energy consumption in the LNG gasification process is reduced. The invention can recycle exhaust heat of exhaust heat boiler, and the recycled energy is used for replacing fossil energy consumption in LNG gasification process, thereby having the beneficial effects of energy conservation and emission reduction.
Drawings
Fig. 1 is a schematic diagram of an LNG gasification system using exhaust heat from exhaust heat boiler flue gas according to the present invention.
Reference numerals illustrate:
the boiler comprises an evaporator 1, a coal economizer 2, a waste heat utilization heat exchanger 3, a chimney 4 and a waste heat boiler flue 5, wherein the boiler comprises a water pump 6, a water storage tank 7, a first heat exchanger 8, a refrigerant pump 9, a refrigerant storage tank 10, a second heat exchanger 11, an LNG storage tank 12, an LNG gasifier 13, an auxiliary heater 14, a first regulating valve 101, a second regulating valve 102, a third regulating valve 103 and a fourth regulating valve 104.
Detailed Description
The invention will now be described in detail with reference to the accompanying drawings and examples:
as shown in fig. 1, the LNG gasification system using flue gas waste heat of a waste heat boiler provided by the present invention includes: the device comprises an evaporator 1, an economizer 2, a waste heat utilization heat exchanger 3, a chimney 4, a waste heat boiler flue 5, a water pump 6, a water storage tank 7, a first heat exchanger 8, a refrigerant pump 9, a refrigerant storage tank 10, a second heat exchanger 11, an LNG storage tank 12, an LNG vaporizer 13, an auxiliary heater 14, a first regulating valve 101, a second regulating valve 102, a third regulating valve 103 and a fourth regulating valve 104.
The flue gas from the exhaust of the gas turbine enters a flue 5 of the waste heat boiler and is discharged into the atmosphere from a chimney 4 after being cooled by an evaporator 1, an economizer 2 and a waste heat utilization heat exchanger 3 in sequence.
Water flows into the water pump 6 from the water storage tank 7, enters the first heat exchanger 8 for cooling after being boosted, flows into the waste heat utilization heat exchanger 3 for absorbing heat and heating and then flows into the water storage tank 7, and the flow of the water in the first heat exchanger 8 and the waste heat utilization heat exchanger 3 can be regulated by the first regulating valve 101 and the temperature of the pipe wall of the waste heat utilization heat exchanger 3 is not lower than the acid dew point of the flue gas; the water circulates between the water storage tank 7, the water pump 6, the first heat exchanger 8 and the waste heat utilization heat exchanger 3.
The refrigerant working medium is boosted from the refrigerant storage tank 10 through the refrigerant pump 9, enters the first heat exchanger 8 for heating, and then enters the second heat exchanger 11 for heat exchange with LNG. The flow rate of the refrigerant working medium in the second heat exchanger 11 and the first heat exchanger 8 can be regulated by the second regulating valve 102, and refrigerant circulation is formed among the refrigerant storage tank 10, the refrigerant pump 9, the first heat exchanger 8 and the second heat exchanger 11. The refrigerant working medium can be selected from light hydrocarbon mixture (such as mixture of propane (C3H 8) and butane (C4H 10)) or other working media applicable to the technology.
LNG flows out of the LNG storage tank 12 and is divided into two paths, one path of LNG flows through the third regulating valve 103 and then enters the conventional LNG vaporizer 13 (typically a submerged combustion vaporizer, an integral vaporizer and a water bath vaporizer) for heating and vaporizing, the other path of LNG flows through the fourth regulating valve 104 and then enters the second heat exchanger 11 for heating and vaporizing, and the two paths of gasified LNG are mixed and then enter the auxiliary heater 17 and the temperature of the LNG is regulated to the temperature required by the system.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only one embodiment of the invention, which is described in more detail and is not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. An LNG gasification system utilizing exhaust heat boiler flue gas waste heat, comprising: the system comprises an evaporator, an economizer, a waste heat utilization heat exchanger, a chimney, a waste heat boiler flue, a water pump, a water storage tank, a first heat exchanger, a refrigerant pump, a refrigerant storage tank, a second heat exchanger, an LNG storage tank, an LNG gasifier and an auxiliary heater;
flue gas from the exhaust of the gas turbine enters a flue of the waste heat boiler, and is discharged into the atmosphere from a chimney after being cooled by an evaporator, an economizer and a waste heat utilization heat exchanger in sequence;
water flows into a water pump from a water storage tank, enters a first heat exchanger for cooling after pressure rise, flows into a waste heat utilization heat exchanger for absorbing heat and heating, and flows into the water storage tank;
the refrigerant working medium is boosted from the refrigerant storage tank through the refrigerant pump, enters the first heat exchanger for heating, and then enters the second heat exchanger for heat exchange with LNG;
LNG flows out of the LNG storage tank and then is divided into two paths, one path of LNG enters the LNG vaporizer, the other path of LNG enters the second heat exchanger for heating and vaporizing, and the LNG after the two paths of vaporization is mixed and then enters the auxiliary heater and the temperature of the LNG is adjusted to the temperature required by the system.
2. An LNG gasification system utilizing waste heat of flue gas from a waste heat boiler according to claim 1 wherein the flow of water in the first heat exchanger and the waste heat utilizing heat exchanger is regulated by a first regulating valve.
3. The LNG gasification system utilizing waste heat of flue gas from a waste heat boiler of claim 2, wherein the first regulating valve is capable of ensuring that the wall temperature of the waste heat utilizing heat exchanger is not lower than the acid dew point of the flue gas.
4. An LNG gasification system utilizing waste heat of flue gas from a waste heat boiler according to claim 1 wherein water is circulated between the water storage tank, the water pump, the first heat exchanger and the waste heat utilizing heat exchanger.
5. The LNG gasification system utilizing waste heat of flue gas from a waste heat boiler according to claim 1, wherein the flow rate of the refrigerant working medium in the second heat exchanger and the first heat exchanger is regulated by the second regulating valve.
6. The LNG gasification system utilizing waste heat of flue gas from a waste heat boiler of claim 1, wherein the refrigerant working medium forms a refrigerant cycle between the refrigerant storage tank, the refrigerant pump, the first heat exchanger and the second heat exchanger.
7. The LNG gasification system utilizing waste heat of flue gas from a waste heat boiler of claim 1, wherein the refrigerant working medium is a mixture of light hydrocarbons.
8. An LNG vaporization system utilizing waste heat from flue gas of a waste heat boiler as claimed in claim 1, wherein LNG is fed to the LNG vaporizer through a third regulator valve.
9. The LNG vaporization system utilizing waste heat of flue gas from a waste heat boiler according to claim 1, wherein LNG is passed through the fourth regulator valve and then enters the second heat exchanger for warming and vaporization.
10. The LNG vaporization system utilizing waste heat of flue gas from a waste heat boiler of claim 1, wherein the LNG vaporizer is a submerged combustion vaporizer, an integrated vaporizer, or a water bath vaporizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310927602.0A CN116838940A (en) | 2023-07-26 | 2023-07-26 | LNG gasification system utilizing waste heat of exhaust-heat boiler flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310927602.0A CN116838940A (en) | 2023-07-26 | 2023-07-26 | LNG gasification system utilizing waste heat of exhaust-heat boiler flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116838940A true CN116838940A (en) | 2023-10-03 |
Family
ID=88174427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310927602.0A Pending CN116838940A (en) | 2023-07-26 | 2023-07-26 | LNG gasification system utilizing waste heat of exhaust-heat boiler flue gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116838940A (en) |
-
2023
- 2023-07-26 CN CN202310927602.0A patent/CN116838940A/en active Pending
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