CN110608092A - A distributed energy system using alternative fuels and its fuel control method - Google Patents

Abstract

The invention discloses a distributed energy system using alternative fuels and a fuel control method thereof, including an intake port, an exhaust port, a No. 1 gas injection valve, a No. 2 gas injection valve, a hydrogen dryer, an intake valve, an exhaust Valves, pistons, photothermal solar components, metal oxide catalytic devices, hydrogen collection devices, intake manifolds, flue gas-hot water type lithium bromide units, flue gas-hot water type heat exchangers, flue gas exhaust pipes, internal combustion engine power generation Units, cylinders and flue gas pipes; use solar photovoltaic photothermal arrays and catalysts to decompose water at high temperatures to generate hydrogen, use hydrogen and natural gas as fuel for internal combustion generator sets, inject hydrogen into the intake manifold, and the hydrogen enters the intake after drying Airways, Improving Distributed Energy Economics with Alternative Fuels. The exhaust smoke of the internal combustion generator set first passes through the flue gas-hot water type lithium bromide unit, and the flue gas after work is discharged to the atmosphere after passing through the flue gas-hot water type heat exchanger to realize the cascade utilization of energy.

Description

A distributed energy system using alternative fuels and its fuel control method

technical field

The invention relates to the field of distributed energy, in particular to a distributed energy system using alternative fuels and a fuel control method thereof.

Background technique

Distributed energy is getting more and more attention. For example, the announcement number is CN108870802A, and the publication date is November 23, 2018. The Chinese patent application, the distributed energy supply proposes natural gas combined heat and power as one of the effective energy-saving and environment-friendly energy supplies. Therefore, it has been widely valued and applied all over the world.

The difficulty of using alternative fuels for internal combustion engines is that the structure of the internal combustion engine needs to be properly modified first, and the difficulty of using alternative fuels is to control the ratio of the original fuel to the alternative fuels. Any deviation in the control will lead to inaccurate engine load. This article , using multi-mode speed regulation control to precisely control the fuel injection volume, and realize cascade utilization of energy to improve the economy of distributed energy.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a distributed energy system using alternative fuels and its fuel control method to solve the problems of expensive fuel prices and poor overall operating economy in distributed energy systems question.

The technical solution adopted by the present invention to solve the above problems is: a distributed energy system using alternative fuels, which is characterized in that it includes an air intake channel, an exhaust channel, No. 1 gas injection valve, No. 2 gas injection valve, hydrogen drying Intake valve, exhaust valve, piston, photothermal solar module, metal oxide catalytic device, hydrogen collection device, intake manifold, flue gas-hot water type lithium bromide unit, flue gas-hot water type heat exchanger , smoke exhaust pipe, internal combustion engine generator set, cylinder and flue gas pipe; the photothermal solar module, metal oxide catalytic device, and hydrogen gas collection device are connected in sequence, and No. 2 gas injection valve is installed on the intake manifold. The hydrogen collecting device is connected with the No. 2 gas injection valve, a hydrogen dryer is installed on the intake manifold, the intake manifold communicates with the intake duct, and the No. 1 gas injection valve and the intake manifold are installed on the intake duct. valve, and the intake port communicates with the exhaust port, an exhaust valve is installed on the exhaust port, the exhaust port communicates with the flue gas pipe, and the flue gas pipe communicates with the flue gas-hot water type lithium bromide unit The air inlet is connected, the exhaust port of the flue gas-hot water type lithium bromide unit is communicated with the flue gas-hot water type heat exchanger through the exhaust pipe, and the air inlet is communicated with the cylinder of the internal combustion engine generator set through the piston, The jacket water outlet of the internal combustion engine generating set is connected with the water inlet of the flue gas-hot water type lithium bromide unit, and the water outlet of the flue gas-hot water type lithium bromide unit generates electricity with the internal combustion engine through a flue gas-hot water type heat exchanger. The jacket water inlet of the unit is connected.

Further, the jacket water outlet of the internal combustion engine generator set is provided with a circulating water pump.

Further, the exhaust port of the flue gas-hot water heat exchanger is provided with a muffler connection.

The fuel control method of the distributed energy system using alternative fuels is characterized in that the fuel injection mode is divided into a pure natural gas injection mode and an alternative fuel injection mode, and according to the mode of speed regulation control and multi-mode speed regulation control, the control The amount of fuel injected into the cylinder, and the preparation of alternative fuels use solar energy and catalysts to decompose at high temperatures to produce hydrogen, which is dried and supplied to internal combustion engine generator sets. At the same time, the flue gas gradient is used to supply flue gas-hot water lithium bromide units and heating cylinder jacket water.

The control method of alternative fuel determines the proportion of fuel allocated by the combustion mode according to the conditions. Specifically, the switching method of alternative fuel is divided into pure natural gas mode speed control and alternative mode speed control. The mode control uses PIDA adjustment method, specifically the speed closed-loop ratio -Integral-differential method; the pure natural gas mode adopts double closed-loop adjustment of speed and position, and the alternative fuel adopts speed regulation control. According to the speed deviation and the set speed, respectively check the proportional equivalent fuel, integral and differential equivalent fuel, and calculate the target of the current engine equivalent fuel.

The original internal combustion engine is refitted, and the No. 2 gas injection valve is installed at the intake manifold, and hydrogen is injected through the intake manifold to replace the fuel. After the hydrogen passes through the hydrogen dryer, it is mixed with natural gas and then enters the cylinder.

Further, the control method of alternative fuels determines the proportion of fuel allocated by the combustion mode according to the conditions. Specifically, the switching methods of alternative fuels are divided into pure natural gas mode speed control and alternative mode speed control. The mode control uses PID adjustment, specifically: The speed closed-loop proportional-integral-differential method; the pure natural gas mode adopts the double closed-loop adjustment method of speed and position, and the alternative fuel adopts speed regulation control. According to the speed deviation and the set speed, respectively check the proportional equivalent fuel and the integral differential equivalent fuel to calculate the current Target fuel equivalent for the engine.

Further, the process is as follows: the hydrogen generated by the decomposition of water at high temperature by the photothermal solar module and the metal oxide catalytic device is collected by the hydrogen collection device, and the hydrogen is injected into the intake manifold through the No. 2 gas injection valve and passed through the hydrogen dryer Entering the intake port, the natural gas enters the intake port through the No. 1 gas injection valve and mixes with hydrogen, and then enters the cylinder through the intake valve, and the exhausted flue gas enters the flue gas-hot water type lithium bromide unit through the flue gas pipe, and the flue gas after doing work The gas passes through the flue gas-hot water type heat exchanger to heat the cylinder jacket water and then discharges to the atmosphere through the muffler. The cylinder jacket water of the internal combustion engine generator set enters the flue gas-hot water type lithium bromide unit through the circulating water pump as the flue gas-hot water type lithium bromide One heat source of the unit.

Compared with the prior art, the present invention has the following advantages and effects: the present invention utilizes solar photovoltaic photothermal arrays and catalysts to decompose water at high temperature to produce hydrogen, and uses hydrogen and natural gas as fuel for internal combustion generator sets, and in the intake manifold Injecting hydrogen, which is dried and fed into the intake tract, improves distributed energy economics with alternative fuels. The exhaust smoke of the internal combustion generator set first passes through the flue gas-hot water type lithium bromide unit, and the flue gas after work is discharged to the atmosphere after passing through the flue gas-hot water type heat exchanger to realize the cascade utilization of energy.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Intake channel 1, exhaust channel 2, No. 1 gas injection valve 3, No. 2 gas injection valve 4, hydrogen dryer 5, intake valve 6, exhaust valve 7, piston 8, circulating water pump 9, photothermal solar module 10. Metal oxide catalytic device 11, hydrogen collection device 12, intake manifold 13, flue gas-hot water type lithium bromide unit 14, flue gas-hot water type heat exchanger 15, flue gas exhaust pipe 16, muffler 17, Internal combustion engine generator set 18, cylinder 19, flue gas pipeline 20.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

Referring to Fig. 1 , the distributed energy system using alternative fuels in this embodiment includes an intake port 1, an exhaust port 2, a No. 1 gas injection valve 3, a No. 2 gas injection valve 4, a hydrogen dryer 5, an intake port Door 6, exhaust valve 7, piston 8, photothermal solar module 10, metal oxide catalytic device 11, hydrogen collection device 12, intake manifold 13, flue gas-hot water type lithium bromide unit 14, flue gas-hot water Type heat exchanger 15, smoke exhaust pipe 16, internal combustion engine generator set 18, cylinder 19 and flue gas pipe 20; photothermal solar module 10, metal oxide catalytic device 11, hydrogen gas collection device 12 are connected in sequence, on the intake manifold 13 The No. 2 gas injection valve 4 is installed, the hydrogen collecting device 12 is connected with the No. 2 gas injection valve 4, the hydrogen dryer 5 is installed on the intake manifold 13, the intake manifold 13 communicates with the intake duct 1, and the intake duct No. 1 gas injection valve 3 and intake valve 6 are installed on 1, and intake port 1 is connected with exhaust port 2, exhaust valve 7 is installed on exhaust port 2, and exhaust port 2 is connected with flue gas pipe 20, The flue gas pipe 20 is connected to the air inlet of the flue gas-hot water type lithium bromide unit 14, and the exhaust port of the flue gas-hot water type lithium bromide unit 14 is connected to the flue gas-hot water type heat exchanger 15 through the exhaust pipe 16 , the exhaust port of the flue gas-hot water heat exchanger 15 is connected with a muffler 17, the intake passage 1 communicates with the cylinder 19 of the internal combustion engine generator set 18 through the piston 8, and the cylinder jacket water outlet of the internal combustion engine generator set 18 is connected to the smoke The water inlet of the gas-hot water type lithium bromide unit 14 is connected, and the jacket water outlet of the internal combustion engine generator set 18 is provided with a circulating water pump 9, and the water outlet of the flue gas-hot water type lithium bromide unit 14 passes through the flue gas-hot water type exchange Heater 15 communicates with the jacket water inlet of internal combustion engine generator set 18 .

The fuel injection mode is divided into pure natural gas injection mode and alternative fuel injection mode. According to the mode of speed control and multi-mode speed control, the amount of fuel injected into the cylinder is controlled. The production of alternative fuel adopts solar energy and catalyst at high temperature Hydrogen gas is produced by decomposition, and is supplied to the internal combustion engine generator set 18 after drying, while the flue gas gradient is used to supply the flue gas-hot water type lithium bromide unit 14 and heating cylinder jacket water.

The control method of alternative fuel determines the proportion of fuel allocated by the combustion mode according to the conditions. Specifically, the switching method of alternative fuel is divided into pure natural gas mode speed control and alternative mode speed control. The mode control uses PIDA adjustment method, specifically the speed closed-loop ratio -Integral-differential method; the pure natural gas mode adopts double closed-loop adjustment of speed and position, and the alternative fuel adopts speed regulation control. According to the speed deviation and the set speed, respectively check the proportional equivalent fuel, integral and differential equivalent fuel, and calculate the target of the current engine equivalent fuel.

The original internal combustion engine is refitted, and No. 2 gas injection valve 4 is installed at the intake manifold 13, and hydrogen is injected through the intake manifold 13 as a substitute fuel. After the hydrogen passes through the hydrogen dryer 5 and mixes with natural gas, it enters the cylinder 19.

The control method of alternative fuel determines the proportion of fuel allocated by the combustion mode according to the conditions. Specifically, the switching method of alternative fuel is divided into pure natural gas mode speed control and alternative mode speed control. The mode control uses PID adjustment method, specifically the speed closed-loop ratio -Integral-differential method; the pure natural gas mode adopts double closed-loop adjustment of speed and position, and the alternative fuel adopts speed regulation control. According to the speed deviation and the set speed, respectively check the proportional equivalent fuel, integral and differential equivalent fuel, and calculate the target of the current engine equivalent fuel.

The working process is as follows: the photothermal solar module 10 and the metal oxide catalytic device 11 decompose water at high temperature to generate hydrogen gas collected by the hydrogen gas collection device 12, and the hydrogen gas is injected into the intake manifold 13 through the No. 2 gas injection valve 4 and passed through The hydrogen dryer 5 enters the intake port 1, and the natural gas enters the intake port 1 through the No. 1 gas injection valve 3 to mix with hydrogen, and then enters the cylinder 19 through the intake valve 6, and the exhausted flue gas enters the flue gas through the flue gas pipe 20- The hot water type lithium bromide unit 14, the flue gas after work is heated by the flue gas-hot water type heat exchanger 15 and then discharged to the atmosphere through the muffler 17, and the jacket water of the internal combustion engine generator set 18 enters the flue gas through the circulating water pump 9 The gas-hot water type lithium bromide unit 14 is used as a heat source of the flue gas-hot water type lithium bromide unit 14 .

In addition, the terms "first", "second", "number one", "number two", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated . Thus, a feature defined as "first", "second", "one", "two", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

Although the present invention has been disclosed as above with the embodiments, it is not intended to limit the scope of protection of the present invention. Any changes and modifications made by those skilled in the art without departing from the concept and scope of the present invention shall be Belong to the protection scope of the present invention.

Claims (8)

1. A distributed energy system using alternative fuels is characterized by comprising an air inlet channel (1), an air exhaust channel (2), a first gas injection valve (3), a second gas injection valve (4), a hydrogen dryer (5), an air inlet valve (6), an exhaust valve (7), a piston (8), a photo-thermal solar module (10), a metal oxide catalytic device (11), a hydrogen collecting device (12), an air inlet manifold (13), a smoke-hot water type lithium bromide unit (14), a smoke-hot water type heat exchanger (15), a smoke exhaust pipeline (16), an internal combustion engine generator set (18), an air cylinder (19) and a smoke pipeline (20); photo-thermal solar module (10), metal oxide catalytic unit (11), hydrogen collection device (12) connect gradually, install No. two gas injection valves (4) on intake manifold (13), hydrogen collection device (12) are connected with No. two gas injection valves (4), install hydrogen desicator (5) on intake manifold (13), intake manifold (13) and intake duct (1) intercommunication, install gas injection valve (3) and (6) on intake duct (1), and intake duct (1) and exhaust passage (2) intercommunication, install exhaust valve (7) on exhaust passage (2), exhaust passage (2) and flue gas pipeline (20) intercommunication, flue gas hot water pipeline (20) are connected with the air inlet of flue gas-hot water type lithium bromide unit (14), the gas vent of flue gas-hot water type lithium bromide unit (14) trades with flue gas-hot water type through exhaust pipe (16) The heat exchanger (15) is communicated, the air inlet channel (1) is communicated with an air cylinder (19) of the internal combustion engine generator set (18) through a piston (8), a cylinder sleeve water outlet of the internal combustion engine generator set (18) is communicated with a water inlet of the smoke-hot water type lithium bromide unit (14), and a water outlet of the smoke-hot water type lithium bromide unit (14) is communicated with a cylinder sleeve water inlet of the internal combustion engine generator set (18) through the smoke-hot water type heat exchanger (15).

2. The distributed energy system using alternative fuel according to claim 1, characterized in that a cylinder liner water outlet of the internal combustion engine generator set (18) is provided with a circulating water pump (9).

3. Distributed energy system using alternative fuels according to claim 1, characterized in that the exhaust of the flue-hot water type heat exchanger (15) is provided with a silencer (17) connection.

4. A fuel control method of a distributed energy system using alternative fuel according to any one of claims 1 to 3, characterized in that the injection mode of the fuel is divided into a pure natural gas injection mode and an alternative fuel injection mode, the fuel amount injected into the cylinder is controlled according to the speed regulation control mode and the multi-mode speed regulation control mode, the alternative fuel is prepared by decomposing solar energy and catalyst at high temperature to generate hydrogen, and the hydrogen is dried and then supplied to the internal combustion engine generator set (18), and meanwhile, the smoke gradient is used for supplying the smoke-hot water type lithium bromide unit (14) and heating cylinder liner water.

5. The fuel control method of the distributed energy system using the alternative fuel according to claim 4, characterized in that the original internal combustion engine is modified, a second gas injection valve (4) is additionally installed at the air inlet manifold (13), hydrogen alternative fuel is injected through the air inlet manifold (13), and the hydrogen enters the cylinder (19) after passing through the hydrogen dryer (5) and being mixed with natural gas.

6. The fuel control method of the distributed energy system using alternative fuel according to claim 4, wherein the control mode of the alternative fuel is divided into pure natural gas mode speed regulation control and alternative mode speed regulation control according to the condition determination of the proportion of fuel distributed in the combustion mode, specifically, the switching mode of the alternative fuel, and the mode control is adjusted by PIDA, specifically, a rotating speed closed loop proportional-integral-differential method; the pure natural gas mode adopts a rotating speed and position double closed loop adjusting mode, the substituted fuel adopts speed regulation control, the proportional equivalent fuel and the integral differential equivalent fuel are respectively consulted according to the rotating speed deviation and the set rotating speed, and the target equivalent fuel of the current engine is obtained through calculation.

7. The fuel control method of the distributed energy system using alternative fuel according to claim 5, wherein the control mode of the alternative fuel is divided into pure natural gas mode speed regulation control and alternative mode speed regulation control according to the condition determination of the proportion of fuel distributed in the combustion mode, specifically, the switching mode of the alternative fuel, and the mode control utilizes a PID (proportion integration differentiation) regulation mode, specifically, a rotating speed closed loop proportional-integral-differential method; the pure natural gas mode adopts a rotating speed and position double closed loop adjusting mode, the substituted fuel adopts speed regulation control, the proportional equivalent fuel and the integral differential equivalent fuel are respectively consulted according to the rotating speed deviation and the set rotating speed, and the target equivalent fuel of the current engine is obtained through calculation.

8. The fuel control method of the distributed energy system using alternative fuel according to claim 4 or 5, characterized by comprising the steps of: the photo-thermal solar module (10) and the metal oxide catalytic device (11) enable hydrogen generated by water decomposition at high temperature to be collected by a hydrogen collecting device (12), the hydrogen is sprayed into an air inlet manifold (13) through a second gas injection valve (4) and enters an air inlet channel (1) through a hydrogen dryer (5), natural gas enters the air inlet channel (1) through a first gas injection valve (3) to be mixed with the hydrogen and then enters an air cylinder (19) through an air inlet valve (6), discharged flue gas enters a flue gas-hot water type lithium bromide unit (14) through a flue gas pipeline (20), the flue gas after acting heats cylinder liner water through a flue gas-hot water type heat exchanger (15) and then is discharged to the atmosphere through a silencer (17), the cylinder sleeve water of the internal combustion engine generator set (18) enters the smoke-hot water type lithium bromide unit (14) through the circulating water pump (9) to be used as a heat source of the smoke-hot water type lithium bromide unit (14).