CN203420766U - Waste heat comprehensive utilization system of CNGE - Google Patents
Waste heat comprehensive utilization system of CNGE Download PDFInfo
- Publication number
- CN203420766U CN203420766U CN201320444987.7U CN201320444987U CN203420766U CN 203420766 U CN203420766 U CN 203420766U CN 201320444987 U CN201320444987 U CN 201320444987U CN 203420766 U CN203420766 U CN 203420766U
- Authority
- CN
- China
- Prior art keywords
- gas
- cnge
- heat exchanger
- engine
- pressure
- 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.)
- Expired - Lifetime
Links
- 239000002918 waste heat Substances 0.000 title claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 131
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 118
- 239000003345 natural gas Substances 0.000 claims abstract description 59
- 239000012530 fluid Substances 0.000 claims description 37
- 230000000087 stabilizing effect Effects 0.000 claims description 16
- 239000000498 cooling water Substances 0.000 claims description 13
- 239000002737 fuel gas Substances 0.000 abstract description 20
- 239000000446 fuel Substances 0.000 abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 230000006837 decompression Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 14
- 230000009467 reduction Effects 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000003915 liquefied petroleum gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Images
Classifications
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The utility model discloses a waste heat comprehensive utilization system of a CNGE, and relates to a novel energy-saving technology of an engine. According to the waste heat comprehensive utilization system of the CNGE, a water heat exchanger is adopted, tail gas and/or cylinder sleeve water waste heat are/is used for heating high pressure fuel gas output by a high pressure gas cylinder, at least two levels of expansion machine devices (one level is an expansion machine with a changeable expansion ratio and the other level is an expansion machine with a fixed expansion ratio) are used for conducting decompression treatment on high pressure fuel gas, so that the needed gas pressure for combustion of an engine is achieved, meanwhile, the expansion machines are used for comprehensive utilization of pressure energy and waste heat, the output shaft work of the engine is increased, the system efficiency of the engine is improved, the trip distance is increased, and natural gas consumption is reduced. The waste heat comprehensive utilization system of the CNGE is compact in structure and reliable in performance, recovers 80% of consumed energy in the gas compression process, and obviously increases the advantages that natural gas is used as engine fuel.
Description
Technical Field
The utility model relates to an energy-conserving technical field of waste heat integrated utilization, especially use the waste heat integrated utilization system of Compressed Natural Gas Engine (CNGE).
Background
The world economy is rapidly developed, the automobile holding capacity is rapidly increased, great convenience is brought to people for going out by the automobile, great contribution is made to human development, but a large amount of petroleum resources are consumed, a large amount of harmful gas is discharged, and the automobile is an important source of urban pollution, particularly PM 2.5. Statistics show that about 54 percent of carbon monoxide CO and 41 percent of nitrogen oxide NO in air pollution of large and medium-sized cities in developed countries in the westX28% of carbon oxide COXFrom automobile exhaust. In China, automobile exhaust also becomes the main culprit of air pollution. Research has shown that the main pollution sources of air pollution in Guangzhou city are: the tail gas of the motor vehicle accounts for 22 percent, the industrial pollution accounts for 20.4 percent, the dust pollution of the construction site accounts for 19.2 percent, and the tail gas of the automobile is evaluated as the 'most intolerable pollutant' by citizens. In order to solve this problem, efforts have been made to change the energy structure and to replace the fuel with a low-pollution/non-pollution automobile engine.
The new energy sources currently used in automobile engines mainly include liquefied petroleum gas, fuel oil and electric hybrid power, pure electric, fuel cells, alcohol fuels and compressed natural gas. The main disadvantage of the popularization of liquefied petroleum gas is that the construction investment of liquefied petroleum gas is huge, 1/3 of gas source is imported by sea, and the use price is increased with the rising of the price of petroleum. Hybrid power and pure electric power sources are mainly limited by battery capacity and service life, so that the problems of battery capacity and service life cannot be solved well, the single-vehicle value is too high, and large-scale popularization is difficult to realize in a short time. The fuel cell mainly refers to a hydrogen fuel cell, and the biggest problems are that the cost of the whole vehicle is high, the infrastructure hydrogenation station cannot keep up with the cost, the service life of the cell is short, and the economy is poor. Alcohol fuels mainly comprise methanol and ethanol, are easy to obtain materials and mainly comprise grains, but the fuel has strong corrosion to equipment, so that the service life of related storage and filling equipment is too short, and the large-scale popularization is difficult. Correspondingly, the Compressed Natural Gas (CNG) fuel has the advantages of low price, single component, large reserve, less harmful emissions, high safety and reliability, good anti-knock performance, great attention, wide market application and wide prospect, and becomes the best substitute fuel for automobile engines.
Natural gas, coal and oil are used as three major pillars of world energy. The total proven reserves of natural gas worldwide are about 140 billion cubic meters, and the total ascertained reserves are 1232 billion tons of oil, which is expected to be exploited for 200 years. Meanwhile, natural gas resources in China are abundant, and the detected reserves are 3.8 billion cubic meters. At present, the production capacity of 3230 billions of cubic meters in year is formed in the Sichuan province, the Chinese and western provinces and at sea in China. With the continuous increase of the natural gas reserves, the application is necessarily wider and wider, and the position in an energy structure is more and more important. The price and environmental protection advantages of CNG (compressed natural gas) as a clean fuel are increasingly obvious, and the CNG is widely applied to automobile engines, particularly taxies and buses.
The working process of the CNG engine automobile is as follows: the high-pressure compressed natural gas is flushed into the gas cylinder, the pressure in the gas cylinder is not more than 20Mpa of nominal pressure, and the danger caused by the overlarge pressure and the temperature rise is prevented; and the pressure can not be less than 3Mpa, so that the phenomenon that the pressure is too small and the gas supply is insufficient can be prevented. The high-pressure compressed natural gas is output from the gas storage cylinder and enters the three-stage pressure reducing valve through the high-pressure electromagnetic valve, the switch of the high-pressure electromagnetic valve is controlled by the ECU, and the high-pressure reducing valve is used for regulating the pressure of the high-pressure compressed natural gas of 20 Mpa-3 Mpa to 0.1 Mpa-0.5 Mpa through pressure reduction and heating. The high-pressure natural gas needs to absorb a large amount of heat due to decompression expansion in the decompression process, and in order to prevent the decompression valve from freezing, the engine coolant is led out to the decompressor to heat the gas. And the decompressed natural gas enters an electronic control regulator, and the electronic control regulator accurately controls the injection amount of the natural gas according to the running condition of the engine. The regulated natural gas and air are fully mixed in the mixer, then enter the engine cylinder, and are ignited by the spark plug for combustion, the ignition of the spark plug is controlled by the ECU, the oxygen sensor monitors the oxygen concentration of the combusted tail gas in real time, the air-fuel ratio is calculated, and the ECU corrects the injection quantity of the natural gas in time according to the feedback signal of the oxygen sensor.
In order to improve the energy utilization efficiency of the CNG engine, experts and scholars at home and abroad work in recent years, such as an in-cylinder direct injection technology, a cooling liquid heating and pressure reducing technology and the like, but the technology is mostly focused on an in-cylinder combustion technology, and the pressure energy of high-pressure natural gas and the waste heat of tail gas are less utilized. The energy consumption is high (0.3-0.5 kWh/kg) in the process of preparing the compressed natural gas for the vehicle, and the high-pressure gas output by the conventional engine through the gas cylinder is reduced in pressure through the pressure reducing valve, so that the throttling loss is serious. The prior art also discloses a CNGE residual pressure energy recovery device, which utilizes CNGE to a certain extent, but has a series of problems in the using process, and the problems are highlighted as follows: firstly, the temperature that utilizes cylinder jacket cooling water is lower, is unfavorable for make full use of pressure ability, and another is that there is great defect in the pressure energy release process of CNG, directly uses the expander to decompress, and the decompression in-process does not have steady voltage measure, and the pressure of pressure source is in gradually attenuating, leads to the expander to be in work under the variable expansion ratio all the time for the expander is unstable to the energy of outer output, and makes the pressure of giving vent to anger of expander unstable, influences the normal stable work of CNGE of low reaches.
Disclosure of Invention
The utility model aims at the above-mentioned shortcoming and not enough of prior art, a Compressed Natural Gas Engine (CNGE) waste heat comprehensive utilization system is proposed, a neotype gas supply economizer system, utilize air supply system's pressure drop and engine exhaust and cylinder liner water waste heat, specifically utilize CNGE's tail gas and cylinder liner water waste heat to carry out step-down processing to high-pressure gas, the step-down of high-pressure gas is that the expander device that uses the variable expansion ratio to combine the constant pressure ratio combines voltage stabilizer, the realization is to high-pressure gas's stable utilization, engine work and efficiency have been improved, can be suitable for various CNG engines.
In order to achieve the above purpose, the technical solution of the utility model is that:
the utility model provides a Compressed Natural Gas Engine (CNGE) waste heat comprehensive utilization system, includes CNG gas storage device, solenoid valve, heat exchanger group, expander set, steady voltage valves, gas nozzle, gas mixer, CNGE through gas piping connection, its characterized in that:
the expansion unit comprises a variable expansion ratio expansion machine and a fixed expansion ratio expansion machine which are connected in series; the heat exchanger group at least comprises a heat exchanger I and a heat exchanger II; the pressure stabilizing valve group at least comprises pressure stabilizing valves I and II; a supercharger unit is arranged in a tail gas pipeline of the CNGE, and comprises a supercharger turbine and a supercharger compressor; wherein,
the gas pipeline between the gas outlet of the CNG gas storage device and the gas inlet of the expansion ratio-variable expansion machine is at least provided with the electromagnetic valve and the heat exchanger I, the gas pipeline between the gas outlet of the expansion ratio-variable expansion machine and the expansion ratio-constant expansion machine is at least provided with the heat exchanger II and the pressure stabilizing valve I, the gas pipeline between the gas outlet of the expansion ratio-constant expansion machine and the gas nozzle is at least provided with the pressure stabilizing valve II,
the turbocharger turbine drives a turbocharger compressor, the turbocharger compressor boosts air and then conveys the air to a gas mixer, the turbocharger turbine is driven by CNGE tail gas flow, cold fluid in each heat exchanger is compressed natural gas, and hot fluid is CNGE tail gas.
Preferably, the CNG storage device fills CNG into the CNG storage device through a filling valve, and stores compressed natural gas not higher than 20 MPa.
Preferably, the electromagnetic valve is used for controlling the on-off of a CNGE air supply system, and is controlled by an electronic control unit ECU of the engine to switch fuel supply.
Preferably, a respective pressure maintaining valve is installed after each expander to stabilize the pressure reduced from the expander outlet.
Preferably, an air filter is arranged at the inlet end of the supercharger compressor.
Preferably, a filter is further arranged on the gas pipeline in front of the gas nozzle.
Preferably, the pressure ratio of the expansion machine with the variable expansion ratio is variable, the working range is 3-20, the pressure ratio of the expansion machine with the fixed expansion ratio is kept constant in the working process, and the pressure ratio is 5-20.
Preferably, a heat exchanger III is further arranged on a gas pipeline between the gas outlet of the expansion machine with the fixed expansion ratio and the gas nozzle, cold fluid in the heat exchanger is compressed natural gas, and hot fluid is CNGE tail gas.
Preferably, the cylinder jacket cooling water of the CNGE is provided with an external circulation pipeline, and inlets on the heat fluid sides of the heat exchangers are connected with the external circulation pipeline or the CNGE tail gas.
Preferably, each heat exchanger can be designed into two different hot fluids in series or in parallel, and the two hot fluids heat the same natural gas. Preferably, the CNGE tail gas passes through the heat exchangers partially or completely and then is collected or passes through the supercharger turbine separately, so as to heat the natural gas at a higher temperature, thereby obtaining a higher expansion work and better utilizing the pressure energy of the natural gas, or the CNGE tail gas passes through the supercharger turbine and then is divided to the heat exchangers.
Preferably, the hot fluid of the heat exchangers I and II is provided by the CNGE tail gas, and the hot fluid of the heat exchanger III is provided by CNGE cylinder jacket cooling water, or the hot fluid of the heat exchangers I and II is provided by CNGE cylinder jacket cooling water, and the hot fluid of the heat exchanger III is provided by CNGE tail gas.
Preferably, in the system, the parts before the expansion ratio fixing expansion machine are connected through a high-pressure gas pipeline, and the parts after the expansion ratio fixing expansion machine are connected through a low-pressure gas pipeline.
Preferably, each expander may be a multi-stage combined expander, each expander may be a piston, screw, vane or hybrid expander, and the constant expansion ratio expander may also be a micro radial inflow expander.
Preferably, each heat exchanger can be in a shell-and-tube type, plate-fin type, spiral tube type and other structures.
The utility model discloses a Compressed Natural Gas Engine (CNGE) waste heat comprehensive utilization system, its work flow is: when an engine using compressed natural gas fuel works, high-pressure fuel gas flowing out of a compressed gas cylinder firstly passes through an electromagnetic valve and enters a heat exchanger I to absorb tail gas of the engine or waste heat of cylinder sleeve water to be heated; the high-pressure fuel gas after heat exchange and temperature rise is expanded to work through a primary variable expansion ratio expander, the pressure of the fuel gas of 20MPa is reduced to a certain design pressure between 0.5 and 2MPa, and the pressure in the gas storage tank is continuously reduced along with the passage of working time, so that the working process of the primary expander is in a variable expansion ratio condition; the high-pressure fuel gas after primary pressure reduction and temperature reduction absorbs engine tail gas or cylinder sleeve water waste heat again through a heat exchanger II and a pressure stabilizing valve I, and then enters a secondary expansion machine to perform expansion work, the pressure is reduced to about 0.05-0.2 MPa from the outlet pressure of a primary expansion machine, and the inlet pressure and the outlet pressure of the secondary expansion machine are stable in the working process and are expansion machines with fixed expansion ratio; the normal pressure gas after being expanded, depressurized and cooled further absorbs waste heat through the pressure stabilizing valve II and the heat exchanger III, so that the phenomenon of icing of a pipeline is prevented, the temperature of the gas entering an engine cylinder is increased, and heat energy is saved; the normal-pressure high-temperature fuel gas after temperature rise is filtered by a filter to remove liquid drops and fine solid particles in the fuel gas, then is sprayed into a front mixer of an engine cylinder through a fuel nozzle and air passing through a turbocharger to be mixed, and finally enters a combustion chamber of the engine. After combustion work, tail gas of engine exhaust gas passing through a turbocharger turbine and high-temperature cylinder sleeve water are used for heat sources of heat exchanger groups I, II and III, for an engine without a turbocharger, the tail gas of the engine exhaust gas is directly used as the heat sources of the heat exchanger groups I, II and III, the heat exchanger III can be cancelled according to different engine designs, and normal-pressure normal-temperature fuel gas enters a mixer after being filtered to be combusted and worked in the engine.
In the CNGE waste heat efficient utilization system, the heat exchange circulation of the heat exchanger mainly has four schemes: according to the first scheme, for a turbocharged engine, part or all of tail gas exhausted by an engine cylinder and subjected to pressure reduction and work application by a turbocharger turbine enters a heat exchanger to serve as a hot fluid to provide a heat source for heating natural gas fuel; in the scheme II, for a turbocharged engine, part or all of exhaust gas of an engine cylinder firstly enters a heat exchanger as hot fluid to provide a heat source for heating natural gas fuel, and then enters a turbocharger turbine to continue expansion; in the third scheme, for the non-turbine supercharged engine, part or all of tail gas exhausted by an engine cylinder enters a heat exchanger to be used as hot fluid to heat natural gas; and in the scheme IV, part or all of the cooling water of the engine cylinder liner enters a heat exchanger to be used as hot fluid to heat natural gas. The four schemes can also be combined, namely the heat of each heat exchanger can be independently from the tail gas of the engine or the cylinder liner water, and can also be mixed for heating.
According to the utility model discloses an on the other hand, still provided the comprehensive utilization method of Compressed Natural Gas Engine (CNGE) waste heat, utilized the utility model discloses a comprehensive utilization system of Compressed Natural Gas Engine (CNGE) waste heat, its characterized in that set up the variable expansion ratio expander and the expansion ratio expander of deciding of establishing ties each other on CNGE's the gas supply pipeline, set up the heat exchanger before each expander, set up the surge damping valve behind each expander, optionally set up the heat exchanger behind the surge damping valve of last one-level expander, be equipped with booster turbine in CNGE's the tail gas pipeline, each cold fluid circulation CNG in the heat exchanger, CNGE tail gas before or after the booster turbine lets in each as the hot-fluid in the heat exchanger, CNGE's cylinder jacket cooling water is optionally cut into each heat exchanger's heat fluid side.
The utility model discloses a compressed natural gas engine waste heat comprehensive utilization system has adopted heat exchanger group and expander set to replace the relief pressure valve to utilize the expansion ratio expander of one-level change and one-level to decide the expansion ratio expander and cooperate, both furthest has utilized natural gas pressure energy and tail gas and cylinder liner water waste heat, and structural simple reasonable again can effectively realize the comprehensive step utilization of waste heat residual pressure, and the engine goes out merit and the efficiency average increase 5 ~ 10% in the operation process.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of the compressed natural gas engine waste heat comprehensive utilization system of the present invention;
fig. 2 is a schematic structural diagram of an embodiment 2 of the compressed natural gas engine waste heat comprehensive utilization system of the present invention;
fig. 3 is a schematic structural diagram of an embodiment 3 of the compressed natural gas engine waste heat comprehensive utilization system of the present invention;
fig. 4 is the schematic structural diagram of embodiment 4 of the compressed natural gas engine waste heat comprehensive utilization system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples.
Fig. 1 shows embodiment 1 of the present invention. The utility model discloses a CNGE waste heat high-efficient system of utilizing includes inflation valve 1, gas cylinder 2, solenoid valve 3, heat exchanger 4, 5, 8, surge damping valve 6, 7, filter 9, gas nozzle 10, blender 11, engine combustion chamber 12, air cleaner 13, natural gas source A, air B, expander unit E1E 2, booster turbine T1, booster compressor C. The expansion unit E1/E2 comprises a primary variable expansion ratio expansion machine E1 and a secondary fixed expansion ratio expansion machine E2, the pressure ratio of the primary expansion machine E1 is variable, the working range is 3-20, and an inlet is connected with an air source of a gas storage bottle through a heat exchanger 4; the pressure ratio of the secondary expansion machine E2 is 5-20, the secondary expansion machine E2 is stable in the working process, and an outlet of the secondary expansion machine E2 enters the gas mixer 11 through the pressure stabilizing valve 7, the heat exchanger 8, the filter 9, the gas nozzle 10 and the like and enters the engine cylinder 12. The heat exchanger group comprises at least two groups of heat exchangers 4 and 5 matched with an expander group E1/E2, the heat exchanger 4 is used for heating high-pressure fuel gas in front of an expander E1, the heat exchanger 5 is used for heating the high-pressure fuel gas after expansion and temperature reduction in front of an expander E2, the heat exchanger 8 is used for heating low-pressure fuel gas in front of a filter 9, the heat exchanger group is connected in series at different positions of a system pipeline, and the heat exchanger group is connected with an exhaust port of an engine or an outlet of a supercharger turbine of the engine or water of a cylinder sleeve of the engine to provide heat medium. The exhaust gas of the engine cylinder can also be subjected to heat exchange through the heat exchangers 4, 5 and 8 to heat the natural gas, then enters the turbocharger turbine T1 and is then discharged. The expansion unit, the heat exchanger group, the engine, the turbocharger and the like are communicated with the valve through a high-pressure/low-pressure gas pipe. A is a gas filling station or other gas sources, and is filled into a compressed natural gas storage cylinder 2 through a gas filling valve 1, the compressed natural gas with the pressure not higher than 20MPa is stored in the gas cylinder, and the specific pressure is determined by the gas filling pressure of the gas filling station; the electromagnetic valve 3 is used for controlling the on-off of the air supply system, and is controlled by an electronic control unit ECU of the engine to convert fuel supply; the pressure stabilizing valves 6 and 7 are arranged behind the expander and are used for stabilizing the pressure reduced from the outlet of the expander; the natural gas passing through the pressure stabilizing valve 7 passes through a filter 9, liquid drops and fine solid particles in the gas are filtered, and the gas is sprayed into a mixer 11 through a gas nozzle 10; the B is outside air which enters the inlet end of the supercharger compressor C through the air filter 13, the supercharger turbine T1 and the supercharger compressor C are coaxially driven, and the filtered air enters the mixer 11 after being pressurized by the supercharger compressor C. The mixed air and natural gas mixture enters an engine 12, and the tail gas of the engine or the tail gas passing through a turbocharger or cylinder liner water enters heat exchangers 4, 5 and 8 for cooling and heat exchange; in the system, 1, 2, 3, 4, 5, 6, E1 and E2 are high-pressure parts and are connected through a high-pressure pipeline; 7. 8, 9, 10, 11, 12, 13, T1 and C are normal pressure parts and are connected through a low pressure pipeline
The working process is as follows: high-pressure fuel gas flowing out of a compressed gas cylinder 2 firstly passes through an electromagnetic valve 3 and enters a heat exchanger 4 to absorb the waste heat of engine tail gas or cylinder sleeve water to be heated; the high-pressure fuel gas subjected to heat exchange and temperature rise is expanded to do work through a primary variable expansion ratio expander E1, the pressure of the fuel gas of 20MPa is reduced to a certain design pressure between 0.5 and 2MPa, the pressure in the gas storage tank is continuously reduced along with the passage of working time, and the working process of the primary expander is variable expansion ratio; the high-pressure fuel gas after the primary pressure reduction and temperature reduction absorbs the exhaust gas of the engine or the waste heat of cylinder sleeve water again through a heat exchanger 5 and a pressure stabilizing valve 6, and then enters a secondary expansion machine E2 to do work by expansion, the pressure is reduced to about 0.05-0.2 MPa from the outlet pressure of a primary expansion machine, and the inlet and outlet pressure is stable in the working process of the secondary expansion machine, so that the expansion machine with the fixed expansion ratio is obtained; the normal pressure gas after expansion, pressure reduction and temperature reduction further absorbs waste heat through the pressure stabilizing valve 7 and the heat exchanger 8, so that the phenomenon of icing of a pipeline is prevented, and the temperature in the engine cylinder is increased; the normal-pressure high-temperature fuel gas after temperature rise is filtered to remove liquid drops and fine solid particles in the fuel gas through a filter 9, then is sprayed into a front mixer 11 of an engine cylinder through a fuel gas nozzle 10 and air passing through a turbocharger to be mixed, and finally enters a combustion chamber of the engine. After combustion work, the tail gas of engine exhaust gas passing through a turbocharger turbine and the high-temperature cylinder sleeve water are used as heat sources of the heat exchanger groups 4, 5 and 8, for the engine without the turbocharger, the tail gas of the engine exhaust gas is directly used as the heat sources of the heat exchanger groups 4, 5 and 8, the heat exchanger 8 can be omitted according to different engine designs, and the normal-pressure normal-temperature fuel gas enters the mixer 11 after being filtered to be combusted in the engine to work.
Fig. 2 shows embodiment 2 of the present invention, which has the same main structure as embodiment 1, and only the connecting portion of the heat exchanger is changed. The cooling water of the cylinder sleeve of the compressed natural gas engine is respectively connected with the heat exchangers 4, 5 and 8 through pipelines, so that a heat source is provided for heating natural gas, and waste heat utilization circulation is completed.
Fig. 3 shows embodiment 3 of the present invention, which has the same main structure as embodiment 1, and only the connecting portion of the heat exchanger is changed. The hot fluid of the heat exchangers 4, 5 and 8 can be derived from engine tail gas and cylinder jacket cooling water, the heat exchangers can be designed into two different hot fluid series connection or parallel connection, and the two hot fluids heat the same natural gas.
Fig. 4 is embodiment 4 of the present invention, the main structure of which is the same as embodiment 1, and only the hot fluid flow process of the heat exchanger is changed. That is, in the turbocharged engine, the exhaust gas of the engine cylinder passes through all or some of the heat exchangers 4, 5, and 8, and then passes through the turbocharger turbine T1 in a summation or independent manner, so as to heat the natural gas with higher temperature, thereby obtaining higher expansion work and better utilizing the pressure energy of the natural gas.
The above embodiments may also be varied, and a combined arrangement may be adopted, for example, the hot fluid of the heat exchangers 4, 5 is provided by engine exhaust gas, the hot fluid of the heat exchanger 8 is provided by jacket cooling water, or the hot fluid of the heat exchanger 4 is provided by jacket cooling water and the hot fluid of the heat exchangers 5, 8 is provided by engine exhaust gas.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a Compressed Natural Gas Engine (CNGE) waste heat comprehensive utilization system, includes Compressed Natural Gas (CNG) gas storage device, solenoid valve, heat exchanger group, expander set, steady voltage valves, gas nozzle, gas mixer, CNGE through gas pipe connection, its characterized in that:
the expansion unit comprises a variable expansion ratio expansion machine and a fixed expansion ratio expansion machine which are connected in series; the heat exchanger group at least comprises a heat exchanger I and a heat exchanger II; the pressure stabilizing valve group at least comprises pressure stabilizing valves I and II; a supercharger unit is arranged in a tail gas pipeline of the CNGE, and comprises a supercharger turbine and a supercharger compressor; wherein,
the gas pipeline between the gas outlet of the CNG gas storage device and the gas inlet of the expansion ratio-variable expansion machine is at least provided with the electromagnetic valve and the heat exchanger I, the gas pipeline between the gas outlet of the expansion ratio-variable expansion machine and the expansion ratio-constant expansion machine is at least provided with the heat exchanger II and the pressure stabilizing valve I, the gas pipeline between the gas outlet of the expansion ratio-constant expansion machine and the gas nozzle is at least provided with the pressure stabilizing valve II,
the turbocharger turbine drives a turbocharger compressor, the turbocharger compressor boosts air and then conveys the air to a gas mixer, the turbocharger turbine is driven by CNGE tail gas flow, cold fluid in each heat exchanger is compressed natural gas, and hot fluid is CNGE tail gas.
2. The system of claim 1, wherein a filter is further disposed on the gas line before the gas burner.
3. The system according to claim 1, wherein a heat exchanger III is further arranged on the gas pipeline between the gas outlet of the expansion machine with the fixed expansion ratio and the gas nozzle, the cold fluid in the heat exchanger is compressed natural gas, and the hot fluid is tail gas of CNGE.
4. The system of claim 1, wherein the cylinder jacket cooling water of the CNGE is provided with an external circulation pipeline, and the heat fluid side of each heat exchanger is connected with the external circulation pipeline or the tail gas of the CNGE.
5. The system of claim 1, wherein each heat exchanger can be designed as two different thermal fluids in series or in parallel, and the two thermal fluids heat the same natural gas.
6. The system of claim 1, wherein the CNGE exhaust gas passes partially or completely through each heat exchanger before being combined or passing through the supercharger turbine separately, or wherein the CNGE exhaust gas passes through the supercharger turbine before being split to each heat exchanger.
7. The system according to claim 3, wherein the hot fluid of the heat exchangers I and II is provided by the CNGE tail gas, and the hot fluid of the heat exchanger III is provided by CNGE cylinder jacket cooling water, or the hot fluid of the heat exchangers I and II is provided by CNGE cylinder jacket cooling water, and the hot fluid of the heat exchanger III is provided by the CNGE tail gas.
8. The system as claimed in claim 1, wherein the components before the constant expansion ratio expander are connected by a high pressure gas line, and the components after the constant expansion ratio expander are connected by a low pressure gas line.
9. The system of claim 1, wherein each expander is a multi-stage combined expander, each expander is a piston, screw, vane or hybrid expander, and the constant expansion ratio expander may be a micro radial expander.
10. The system of claim 1, wherein each heat exchanger is a shell and tube, plate fin, or spiral tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320444987.7U CN203420766U (en) | 2013-07-24 | 2013-07-24 | Waste heat comprehensive utilization system of CNGE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320444987.7U CN203420766U (en) | 2013-07-24 | 2013-07-24 | Waste heat comprehensive utilization system of CNGE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203420766U true CN203420766U (en) | 2014-02-05 |
Family
ID=50019865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320444987.7U Expired - Lifetime CN203420766U (en) | 2013-07-24 | 2013-07-24 | Waste heat comprehensive utilization system of CNGE |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203420766U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437870A (en) * | 2013-07-24 | 2013-12-11 | 中国科学院工程热物理研究所 | System and method for comprehensively utilizing residual heat of compressed natural gas engine (CNGE) |
| CN107082006A (en) * | 2017-05-18 | 2017-08-22 | 北京理工大学 | Hydrogen cell automobile high pressure hydrogen refrigerating plant |
| CN107086319A (en) * | 2017-05-18 | 2017-08-22 | 北京理工大学 | Hydrogen cell automobile high-pressure hydrogen storing pressure tank energy retracting device |
| CN107246739A (en) * | 2017-06-02 | 2017-10-13 | 北京理工大学 | Hydrogen internal combustion engine automobile high pressure hydrogen refrigerating plant |
| CN108979771A (en) * | 2017-06-02 | 2018-12-11 | 北京理工大学 | Hydrogen internal combustion engine automobile high-pressure hydrogen storing pressure tank energy recyclable device |
| CN109458551A (en) * | 2018-12-17 | 2019-03-12 | 吉林大学 | A kind of hydrogen cell automobile high-pressure hydrogen storing pressure tank energy recyclable device and recovery method |
| CN115253585A (en) * | 2022-07-29 | 2022-11-01 | 中国科学院工程热物理研究所 | For CO2Method and system for utilizing collected residual pressure power generation cold energy |
-
2013
- 2013-07-24 CN CN201320444987.7U patent/CN203420766U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437870A (en) * | 2013-07-24 | 2013-12-11 | 中国科学院工程热物理研究所 | System and method for comprehensively utilizing residual heat of compressed natural gas engine (CNGE) |
| CN103437870B (en) * | 2013-07-24 | 2016-04-06 | 中国科学院工程热物理研究所 | A kind of CNG engine waste heat comprehensive utilization system |
| CN107082006A (en) * | 2017-05-18 | 2017-08-22 | 北京理工大学 | Hydrogen cell automobile high pressure hydrogen refrigerating plant |
| CN107086319A (en) * | 2017-05-18 | 2017-08-22 | 北京理工大学 | Hydrogen cell automobile high-pressure hydrogen storing pressure tank energy retracting device |
| CN107246739A (en) * | 2017-06-02 | 2017-10-13 | 北京理工大学 | Hydrogen internal combustion engine automobile high pressure hydrogen refrigerating plant |
| CN108979771A (en) * | 2017-06-02 | 2018-12-11 | 北京理工大学 | Hydrogen internal combustion engine automobile high-pressure hydrogen storing pressure tank energy recyclable device |
| CN109458551A (en) * | 2018-12-17 | 2019-03-12 | 吉林大学 | A kind of hydrogen cell automobile high-pressure hydrogen storing pressure tank energy recyclable device and recovery method |
| CN115253585A (en) * | 2022-07-29 | 2022-11-01 | 中国科学院工程热物理研究所 | For CO2Method and system for utilizing collected residual pressure power generation cold energy |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103437870B (en) | A kind of CNG engine waste heat comprehensive utilization system | |
| CN203420766U (en) | Waste heat comprehensive utilization system of CNGE | |
| AU2018369153B2 (en) | Hydrated magnesium hydride energy system | |
| CN102758689B (en) | Ultra-supercritical air energy storage/release system | |
| CN102758690B (en) | Efficient high-pressure liquid air energy storage/release system | |
| CN103016152B (en) | Supercritical air energy storage system with novel process | |
| CN102758748B (en) | High-pressure liquid air energy storage/release system | |
| CN202970911U (en) | Novel-process supercritical air energy storage system | |
| CN202811078U (en) | Ultra-supercritical air energy storage/release system | |
| CN109505666A (en) | A kind of jet expansion compound compression air energy storage systems | |
| CN105370408A (en) | Novel heat accumulating type compressed air energy storage system | |
| CN1305161C (en) | Hybrid power system for vehicle-use fuel cell gas curbine | |
| CN104266454A (en) | Liquefied natural gas production system with gas-supercritical carbon dioxide united power | |
| CN209586452U (en) | A kind of jet expansion compound compression air energy storage systems | |
| CN108979771A (en) | Hydrogen internal combustion engine automobile high-pressure hydrogen storing pressure tank energy recyclable device | |
| CN100434665C (en) | Liquefied natural gas double-driving automobile circulatory system based on opening Rankine cycle | |
| CN204716420U (en) | Case sled formula natural gas generator group device | |
| CN202811079U (en) | High-efficiency and high-pressure liquid air energy storage/ release system | |
| CN202811238U (en) | High-pressure liquid-state air energy storage/release system | |
| CN204299702U (en) | Gas turbine distributed CCHP system | |
| CN113864017A (en) | Kalina/organic Rankine combined cycle power generation system utilizing LNG cold energy and geothermal energy | |
| CN102889147B (en) | High-efficiency and low-emission novel composite thermodynamic cycle control method for engine | |
| CN105329089B (en) | Power system for increasing and storing cold energy of vehicle and ship | |
| CN216841973U (en) | High-pressure and low-pressure hydrogen double-injection system for hydrogen engine | |
| CN203441537U (en) | Air-source engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CAS AONENG (BEIJING) ENERGY-SAVING TECHNOLOGY CO., Free format text: FORMER OWNER: ENGINEERING THERMO-PHYSICS INST., CHINESE ACADEMY OF SCIENCES Effective date: 20150430 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100190 HAIDIAN, BEIJING TO: 100081 HAIDIAN, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20150430 Address after: 100081, 8 floor, No. 18 Zhongguancun Avenue, Beijing, Haidian District, 05-420 Patentee after: Zhongke Halometasone (Beijing) energy saving Technology Co.,Ltd. Address before: 100190 Beijing Haidian District North Fourth Ring Road West, No. 11 A202 Patentee before: Institute of Engineering Thermophysics, Chinese Academy of Sciences |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20210223 Address after: 100190, No. 11 West Fourth Ring Road, Beijing, Haidian District Patentee after: Institute of Engineering Thermophysics, Chinese Academy of Sciences Address before: 100081 05-420, 8th floor, 18 Zhongguancun Street, Haidian District, Beijing Patentee before: Zhongke Halometasone (Beijing) energy saving Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220228 Address after: 903, floor 9, building 3, No. 15, xidawang Road, Chaoyang District, Beijing 100022 Patentee after: Zhongke Jiulang (Beijing) Energy Technology Co.,Ltd. Address before: 100190, No. 11 West Fourth Ring Road, Beijing, Haidian District Patentee before: Institute of Engineering Thermophysics, Chinese Academy of Sciences |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140205 |
|
| CX01 | Expiry of patent term |