CN102155290A - Auxiliary combustion-engine type pressurization system for restoring plateau power of internal-combustion engine - Google Patents

Abstract

The invention provides an auxiliary combustion-engine type pressurization system for restoring the plateau power of an internal-combustion engine, and belongs to the technical field of thermal power engines. The auxiliary combustion-engine type pressurization system mainly comprises an auxiliary air cleaner, an auxiliary pressurization air compressor, an auxiliary burning air compressor, an auxiliary turbine, a combustion chamber, an electromagnetic valve oil injection device, an ignition device, a switching valve and the like. When the internal-combustion engine runs in a place with a high altitude, the auxiliary pressurization system is arranged so as to restore the power of the internal-combustion engine by a main pressurizer and the auxiliary pressurization system; when the internal-combustion engine runs in a place with a low altitude, the main pressurizer and the internal-combustion engine are matched normally to work only. The auxiliary pressurization system can be dismantled freely, so that aims of simplifying the cabin arrangement of the engine, enhancing the running reliability and making the structure simple and compact can be fulfilled.

Description

A Gas-fired Auxiliary Supercharging System for Restoring Plateau Power of Internal Combustion Engines

technical field

The invention relates to a gas-fired auxiliary supercharging system for recovering plateau power of an internal-combustion engine, which belongs to the technical field of heat engines.

Background technique

The use of exhaust gas turbocharging technology is currently one of the most effective methods to restore the plateau power of the internal combustion engine. Ordinary single-stage turbocharging systems can restore the power of the internal combustion engine within a certain range of altitudes. This is because, when the altitude increases, due to the decrease of the exhaust back pressure, the expansion ratio of the turbine and the temperature of the exhaust gas before the turbine both increase, and the increase of the gas energy at the inlet of the turbine leads to an increase of the output work of the turbine, thereby increasing the speed of the turbocharger , so that the compressor will form a higher boost pressure, and the pressure ratio will increase, compensating for the reduction of intake air due to the increase in altitude, which reflects the automatic compensation ability of turbocharging. However, at a higher altitude range, limited by the pressure ratio, speed and flow range of the turbocharger, there will be insufficient air intake of the internal combustion engine, power reduction, increased turbocharger speed, and the operating point entering the non-working area. Restoring combustion engine power at higher altitudes requires a booster system with a higher pressure ratio and flow range.

As a high-pressure supercharging system with obvious advantages, the two-stage supercharging system is widely used in high-power diesel engines in military and civilian fields. The two-stage turbocharging system is to connect two turbochargers and diesel engines in series on the air circuit. This method can ensure that the entire system has a high boost pressure, while the boost pressure of each stage of the supercharger is relatively low, and the compressor can work stably in a wide flow range and high efficiency area. As a result, the reliability of the turbocharger is improved, the noise is reduced, and it is insensitive to changes in ambient temperature and pressure. However, this supercharger system needs to arrange two superchargers in structure, as well as the adjustment mechanism and connecting pipelines between them, which not only requires great changes to the original internal combustion engine structure, but also increases the limited space. The difficulty of compact arrangement of internal components; in addition, for internal combustion engines using a two-stage supercharger system, the two-stage superchargers in the supercharger system must be put into operation at the same time at any altitude, and there must be a certain real-time adjustment strategy to control each stage. The operation of the supercharger undoubtedly increases the complexity of the operation of the internal combustion engine in low-altitude areas or when only a single-stage supercharger is required to meet the supercharging requirements of the internal combustion engine. More importantly, the matching parameters of the two-stage supercharging system for recovering power at high altitudes and the matching parameters of the supercharging system for the purpose of improving work performance on plains are completely different, and it is difficult to balance them.

Contents of the invention

The purpose of the present invention is in order to overcome above-mentioned deficiencies in the prior art, has designed a kind of auxiliary pressurization system with the recovery internal combustion engine plateau power of auxiliary compressor and gas power plant. When the internal combustion engine operates at high altitudes, the auxiliary supercharging system is installed to recover the power of the internal combustion engine through the main supercharging system and the auxiliary supercharging system; when the internal combustion engine operates at low altitudes, only the main supercharging system and the internal combustion engine are used Normal matching works.

The purpose of the present invention is achieved through the following technical solutions.

The gas-fired auxiliary supercharging system used to recover the plateau power of the internal combustion engine in the present invention mainly includes: auxiliary air filter, auxiliary booster compressor, auxiliary combustion compressor, auxiliary turbine, solenoid valve fuel injection device, combustion chamber, ignition device, starting It is connected with the control system and switching valve; the auxiliary booster compressor, auxiliary combustion compressor and auxiliary turbine are coaxially connected, the inlet of the auxiliary air filter is connected with the atmosphere, the inlet of the auxiliary booster compressor, the inlet of the auxiliary combustion compressor and the auxiliary air filter The outlet is connected, and the solenoid valve fuel injection device provides fuel for the combustion chamber. The outlet of the booster compressor is connected to the inlet of the main booster system; when the internal combustion engine is working at a high altitude, high-pressure air is used to supply the combustion chamber to directly start the auxiliary booster system. The fresh air first passes through the auxiliary air filter and then enters the auxiliary booster compressor respectively Compressed by the engine and the auxiliary combustion compressor, the fuel is sprayed into the combustion chamber through the solenoid valve fuel injection device, the atomized fuel is mixed with the compressed air from the auxiliary combustion compressor, and the fuel-air mixture is ignited by the combustion chamber ignition device to generate The high-temperature gas pushes the auxiliary turbine to expand and do work to drive the auxiliary booster compressor and the auxiliary combustion compressor. The compressed air flowing out of the auxiliary booster compressor flows through the switching valve and the air filter, enters the compressor to be further compressed, and then passes through the The intercooler cools down the temperature and volume flow of the air. Finally, the air enters the internal combustion engine and is mixed with fuel for combustion. The high-temperature exhaust gas generated by the combustion enters the turbine of the main supercharging system to expand and do work to drive its compressor. The exhaust gas after the expansion of the turbine is exhausted. into the atmosphere.

The switching valve is a two-position three-way valve, and the air inlet of the main booster system communicates with the atmosphere or the auxiliary booster compressor through the switching of this valve.

As a standard configuration, the gas-fired auxiliary booster system is directly installed on special vehicles used in plateaus, or temporarily installed as an auxiliary device on non-specialized vehicles working in plateau areas.

The power to drive the auxiliary booster compressor comes from the gas turbine coaxial with it.

The auxiliary boost system of the gas-fired type has a separate controller, which adjusts the working condition of the system according to the boost pressure.

The start-up of the auxiliary booster system of the gas-fired type adopts the direct start-up method of supplying high-pressure air to the combustion chamber.

The beneficial effect of the present invention is that: when the vehicle is working in a plain area, it is not affected by the plateau recovery power device at all; as the altitude of the vehicle is increased, the main supercharging system can work independently within a certain range to recover the plateau power of the internal combustion engine, It can also work together with the auxiliary supercharging system to restore the power of the internal combustion engine; the auxiliary supercharging system can be disassembled freely, which can achieve the purpose of simplifying the layout of the engine room, increasing the reliability of operation, and having a simple and compact structure.

Description of drawings

Figure 1 is a system schematic diagram of an embodiment of the present invention.

In the figure: 1-auxiliary air filter 2-auxiliary booster compressor 3-auxiliary combustion compressor 4-auxiliary turbine 5-solenoid valve fuel injection device 6-combustion chamber 7-ignition device 8-starting and control system 9-switching valve 10-air filter 11-compressor 12-intercooler 13-internal combustion engine 14-turbine

Detailed ways

In order to better illustrate the purpose and advantages of the present invention, the content of the present invention will be further described below in conjunction with specific examples.

As shown in Figure 1, the gas-fired auxiliary supercharging system for recovering the plateau power of the internal combustion engine of the present invention mainly includes an auxiliary air filter 1, an auxiliary supercharging compressor 2, an auxiliary combustion compressor 3, an auxiliary turbine 4, and a solenoid valve fuel injection device 5. Combustion chamber 6, ignition device 7, starting and control system 8, switching valve 9. The main supercharging system mainly includes an air filter 10 , a compressor 11 , an intercooler 12 , an internal combustion engine 13 and a turbine 14 .

When the internal combustion engine works at a low altitude, the switching valve 9 only connects the atmosphere with the air filter 10, and relies on the main supercharging system (the dotted line area in Figure 1) to match and work normally with the internal combustion engine 13, and its working principle is the same as that of an ordinary supercharged internal combustion engine .

When the internal combustion engine is working in a high-altitude area, high-pressure air is used to supply the combustion chamber 6 to directly start the auxiliary supercharging system. After the fresh air first passes through the auxiliary air filter 1, it enters the auxiliary supercharging compressor 2 and the auxiliary combustion Afterwards, the air temperature and pressure are increased. The fuel is sprayed into the combustion chamber 6 through the solenoid valve fuel injection device 5, the atomized fuel is mixed with the compressed air from the auxiliary combustion compressor 3, and the fuel-air mixture is ignited by the combustion chamber ignition device 7, and the generated high-temperature gas drives the auxiliary combustion chamber. The turbine 4 expands and works to drive the auxiliary supercharging compressor 2 and the auxiliary combustion compressor 3, and the control system 8 adjusts the working conditions of the auxiliary supercharging system according to the supercharging pressure. The compressed air flowing out of the auxiliary booster compressor 2 flows through the switching valve 9 and the air filter 10, enters the compressor 11 and is further compressed, the temperature and pressure continue to increase, and then is cooled by the intercooler 12 to reduce the temperature and pressure of the air. volume flow. After such a supercharging process, the air enters the internal combustion engine 13 and is mixed with fuel for combustion, and the high-temperature exhaust gas generated by the combustion enters the turbine 14 of the main supercharging system to expand and do work to drive its compressor 11, and the exhaust gas expanded by the turbine 14 is discharged into the atmosphere.

Claims (6)

1. be used to recover the motive combustion type additional mechanical supercharging of internal-combustion engine high system, mainly comprise: auxiliary empty filter, additional mechanical supercharging gas compressor, auxiliary combustion gas compressor, auxiliary turbine, solenoid valve fueling injection equipment, firing chamber, ignition mechanism, starting and control system, switching valve; It is characterized in that: additional mechanical supercharging gas compressor, auxiliary combustion gas compressor and auxiliary turbine is coaxial is connected, auxiliary empty filter import is connected with atmosphere, additional mechanical supercharging compressor inlet, auxiliary combustion compressor inlet are communicated with auxiliary empty filter outlet, the solenoid valve fueling injection equipment provides fuel oil for the firing chamber, the firing chamber import is communicated with the auxiliary combustion blower outlet, auxiliary turbine inlet is communicated with combustor exit, auxiliary turbine outlet is communicated with atmosphere, and the two-bit triplet switching valve is communicated with additional mechanical supercharging blower outlet, atmosphere and main pressurization system import respectively; Internal combustion engine adopts high-pressure air to supply with firing chamber across-the-line starting additional mechanical supercharging system when the high altitude localities, fresh air is at first by behind the auxiliary empty filter, enter the compression of additional mechanical supercharging gas compressor and auxiliary combustion gas compressor respectively, fuel oil is injected in the firing chamber by the solenoid valve fueling injection equipment, the fuel oil of process atomizing mixes with the pressurized air from the auxiliary combustion gas compressor, by the firing chamber ignition mechanism gas mixture is lighted, the high-temperature fuel gas that produces promotes auxiliary turbine expansion acting, to drive additional mechanical supercharging gas compressor and auxiliary combustion gas compressor, the pressurized air that is flowed out by the additional mechanical supercharging gas compressor is flowed through behind switching valve and the empty filter, entering into gas compressor is further compressed, cool off temperature and the volume flowrate that reduces air through intercooler then, last air enters internal-combustion engine and fuel oil mixed combustion, the high-temp waste gas that burning produces enters into the turbine expansion acting of main pressurization system, to drive its gas compressor, enter atmosphere through the waste gas behind the turbine expansion.

2. as claimed in claim 1ly be used to recover the high motive combustion type additional mechanical supercharging of internal-combustion engine system, it is characterized in that: described switching valve is a two-position three-way valve, and main pressurization system suction port communicates with atmosphere or additional mechanical supercharging gas compressor by the switching realization of this valve.

3. as claimed in claim 1 or 2ly be used to recover the high motive combustion type additional mechanical supercharging of internal-combustion engine system, it is characterized in that: combustion type additional mechanical supercharging system is directly installed on the special-purpose vehicle that is used for the plateau as standard configuration, or is installed on the non-special-purpose vehicle that enters plateau section work as auxiliary device temporarily.

4. as claimed in claim 1 or 2ly be used to recover the high motive combustion type additional mechanical supercharging of internal-combustion engine system, it is characterized in that: the power resources that drive the additional mechanical supercharging gas compressor are in the gas turbine coaxial with it.

5. as claimed in claim 1 or 2ly be used to recover the high motive combustion type additional mechanical supercharging of internal-combustion engine system, it is characterized in that: combustion type additional mechanical supercharging system has independent controller, according to the working condition of boost pressure regulating system.

6. as claimed in claim 1 or 2ly be used to recover the high motive combustion type additional mechanical supercharging of internal-combustion engine system, it is characterized in that: the starting of combustion type additional mechanical supercharging system adopts high-pressure air to supply with firing chamber across-the-line starting mode.

Images