WO2020132777A1

WO2020132777A1 - Fuel oil temperature control system and control method thereof

Info

Publication number: WO2020132777A1
Application number: PCT/CN2018/122963
Authority: WO
Inventors: 王莉
Original assignee: 王莉
Priority date: 2018-12-23
Filing date: 2018-12-23
Publication date: 2020-07-02

Abstract

A fuel oil temperature control system and a control method thereof. A longitudinal partition plate (14) is provided in an oil storage container (1), and the longitudinal partition plate (14) divides the oil container (1) into a primary oil sub-container (1a) and a secondary oil sub-container (1b). Both an oil outlet (16) and a return port (15) of the oil storage container (1) are provided in the primary oil sub-container (1a). An overflow channel (10) communicating with the primary oil sub-container (1a) and the secondary oil sub-container (1b) is provided above the longitudinal partition plate (14). The secondary oil sub-container (1b) communicates with an inlet of an oil feeding pump (13). An outlet of the oil feeding pump (13) communicates with the primary oil sub-container (1a) via an oil feeding pipe (11). The ratio of the volume of the primary oil sub-container (1a) to the volume of the secondary oil sub-container (1b) is 1 : (2 to 5). The fuel oil temperature control system preferentially heats the small-volume primary oil sub-container. When the primary oil sub-container (1a) is filled with oil, the preheated oil overflows into the secondary oil sub-container (1b). When the secondary oil sub-container (1b) is filled with oil, the oil in the primary oil sub-container (1a) is circulated and heated, such that the oil circulates and exchanges heat between the primary oil sub-container (1a) and the secondary oil sub-container (1b). The invention ensures that an electromagnetic induction heating pipe (4) has high electrical energy utilization efficiency, has good flexibility in using oil, and is suitable for simultaneously supplying oil to multiple internal combustion engines.

Description

Fuel oil temperature control system and its control method

Technical field

The invention relates to a fuel supply system of an internal combustion engine, in particular to a fuel temperature control system.

Background technique

In the internal combustion engine, the heating of the fuel is usually by steam heating, but in the absence of a steam source, the use of electromagnetic induction and electric heating is also a good choice. For large internal combustion engines with frequent load changes, especially multi-group internal combustion engines work together When the fuel consumption is large, it is usually necessary to use a fuel tank with a larger capacity to store part of the fuel. The part of the oil is preheated to use requirements. When in use, it directly supplies fuel to multiple sets of internal combustion engines. The existing fuel supply system It mainly uses a single oil storage tank for oil storage and heat storage. Its structure includes an oil storage tank. The oil storage tank is used for oil storage. The outlet of the oil storage tank is connected to the electromagnetic induction heating tube through the pump. The outlet of the electromagnetic induction heating tube is divided into two channels. , All the way back to the oil storage cabinet through the return valve, and the other way to supply high temperature hot oil to the outside world through the oil valve. When the return valve is opened and the oil valve is closed, the oil in the oil storage tank is sent to the electromagnetic induction heating pipe through the pump 1, and then flows back to the oil storage tank through the return valve, forming internal circulation heating. When the oil conservator T reaches _{the pre-set} temperature, the oil valve opening, the return valve closed, to reach the preheat temperature to hot oil via electromagnetic induction heating tube heated up again for delivery, by controlling the oil and The opening angle of the valve controls the flow of outgoing oil. The shortcomings are: the existing single oil tank oil storage heat storage type electromagnetic induction oil heating equipment, due to the large amount of oil, the warm-up time is relatively long, which requires the oil tank to be partially supplied in a short time after filling the oil Fuel oil is very difficult, therefore, it will affect the start-up time of the entire unit put into operation.

Summary of the invention

The purpose of the present invention is to provide a fuel temperature control system and its control method, aiming to solve the shortcomings of the existing single oil tank overall preheating time is too long, so that it can meet the short time to provide part of the high temperature oil For specific use requirements.

The purpose of the present invention is achieved in this way: a fuel temperature control system, including an oil storage tank, the oil outlet of the oil storage tank is connected to the inlet of the electromagnetic induction heating pipe through a circulation pump, and the outlet of the electromagnetic induction heating pipe is divided into two paths , One way is connected to the return port of the oil storage tank through the return valve, and the other way is used to supply high temperature hot oil to the outside world through the oil valve. The oil storage tank is provided with a longitudinal partition to divide the oil tank into the main area of the oil tank and In the auxiliary area of the oil tank, the oil outlet and return port of the oil storage tank are set in the main area of the oil tank, and an overflow channel connecting the main area of the oil tank and the auxiliary area of the oil tank is left above the longitudinal partition; The auxiliary area of the cabinet is connected to the inlet of the oil injection pump, and the outlet of the oil injection pump is connected to the main area of the oil tank through the oil injection pipe; the volume ratio of the main area of the oil tank and the auxiliary area of the oil tank is 1: (2-5).

The invention can preferentially heat the main area of a small-capacity oil tank, and can supply oil at any time after the use requirements are met. When the main area of the oil tank is full, the oil after preheating and heating can overflow into the auxiliary area of the oil tank, when the oil tank After the auxiliary area is full of oil, the oil in the main area of the oil tank can be circulated and heated while circulating the oil in the main area of the oil tank and the auxiliary area of the oil tank to achieve heat preservation. In the above process, as long as the main area of the oil tank The oil temperature reaches the requirements for use, and oil can be supplied to the outside at any time. With more than two sets of the system, it can be used interchangeably to control the intermittent time of the external oil. The intermittent time of the oil can be used to heat and replenish the oil in the main area of the oil tank, so that the The oil temperature is always maintained at a relatively constant set temperature. The device ensures that the electromagnetic induction heating tube works at rated power most of the time, and the electric energy utilization efficiency is high. During the overflow to the auxiliary area of the oil tank, the main area of the oil tank The oil always meets the requirements of use. In the case of large oil demand, the oil injection pump can also be started when the auxiliary area of the oil tank is not full, and the oil in the auxiliary area of the oil tank is driven into the main area of the oil tank for use. When the volume ratio of the main area of the oil tank to the auxiliary area of the oil tank is 1: (2-5), its oil has greater flexibility, can quickly provide oil, and at the same time, it can take into account the continuous use of high-temperature oil demand. The device can be used for fuel supply of multiple large internal combustion engines.

For the convenience of control, oil temperature sensors and liquid level sensors are respectively installed in the main area of the oil tank and the auxiliary area of the oil tank. The oil temperature sensor controls the start and stop of circulating heating of the oil, and the supply and input of external oil sources are controlled by the liquid level sensors. stop.

Further, the height corresponding to the high level signal of the liquid level sensor in the main area of the oil tank is lower than the lowest position of the overflow channel.

In order to limit the excessive impact of the heated high-temperature oil flow on the main area of the oil tank, a throttle ring is provided between the return valve and the return port.

To further facilitate the flow control, a flow regulating valve is provided on the pipeline of the oil injection pipe.

As a further improvement of the present invention, the main area of the oil tank and the auxiliary area of the oil tank are respectively provided with oil filling ports.

The invention also discloses a control method of the fuel temperature control system, including the following steps:

1) Control the oil in the main zone of the oil tank to be above the set lower limit of the main zone oil level and below the upper limit of the main zone oil level, start the circulation pump and electromagnetic induction heating tube, open the return valve, and shut off the oil valve to keep the oil in Continuous heating between the main area of the oil tank and the electromagnetic induction heating tube, to keep the oil temperature in the main area rise to the set temperature range, replenish oil to the main area of the oil tank, to ensure that the oil temperature can still be maintained after the heating cycle Within the setting range, the oil level in the main zone is continuously increased by replenishing oil. When replenishing oil, the oil in the auxiliary zone of the oil tank is used first, only when the oil level in the auxiliary zone is low or the oil temperature in the main zone and the oil temperature in the auxiliary zone are both Only when the set temperature is reached, the oil is supplied from the external oil source;

2) When the oil level in the main area of the oil tank reaches the upper limit of the oil level in the main area, continue oil replenishment and circulating heating, so that the oil reaching the set temperature range will overflow into the auxiliary area of the oil tank until the oil in the auxiliary area of the oil tank reaches Set the upper limit of the oil level in the auxiliary zone; stop filling the oil tank main zone;

3) Start the oil injection pump to circulate oil in the main area of the oil tank and the auxiliary area of the oil tank. At the same time, the electromagnetic induction heating pipe continues to work to maintain the oil temperature in the main area of the oil tank and the auxiliary area of the oil tank within the set temperature range. When the upper limit of the set temperature is reached, the pump is stopped, the valve is closed and the electromagnetic induction heating tube is powered off, and when the oil temperature drops to the lower limit of the set temperature, it is started again.

In steps 1), 2), and 3), when the oil temperature in the main zone reaches the set temperature range, close the return valve and open the oil valve to supply oil to the outside world; when the oil level in the main zone of the oil tank drops When the lower limit of the set main zone oil level is reached, the oil valve is closed.

Through the above control, the oil can be made more flexible and convenient, with multiple working modes.

BRIEF DESCRIPTION

Figure 1 is a schematic diagram of the structure of the present invention.

Among them, 1 oil storage tank, 1a oil tank main area, 1b oil tank auxiliary area, 2, oil outlet, 3 oil valve, 4 electromagnetic induction heating pipe, 5 return valve, 6 circulation pump, 7 oil inlet, 8 Oil temperature sensor, 9 liquid level sensor, 10 overflow channel, 11 oil injection pipe, 12 flow control valve, 13 oil injection pump, 14 longitudinal partition, 15 return port, 16 oil outlet.

detailed description

As shown in FIG. 1, it is a fuel temperature control system, including an oil storage tank 1. The oil outlet 16 of the oil storage tank 1 is connected to the inlet of the electromagnetic induction heating pipe 4 via the circulation pump 6, and the outlet of the electromagnetic induction heating pipe 4 Divided into two ways, one way is connected to the return port 15 of the oil storage cabinet 1 through the return valve 5, the other way is used to supply high temperature hot oil to the outside world through the oil valve 3, the oil storage cabinet 1 is provided with a longitudinal partition 14 to separate the oil tank The oil tank main area 1a and the oil tank auxiliary area 1b, the oil outlet 16 and the return port 15 of the oil storage tank 1 are provided in the oil tank main area 1a, and the main oil tank main area 1a and The overflow passage 10 of the oil tank auxiliary area 1b; the oil tank auxiliary area 1b is connected to the inlet of the oil injection pump 13, and the outlet of the oil injection pump 13 is connected to the oil tank main area 1a via the oil injection pipe 11; the oil tank main area 1a and the oil tank auxiliary area The volume ratio of 1b is 1: (2-5).

The oil tank main area 1a and the oil tank auxiliary area 1b are respectively provided with an oil temperature sensor 8 and a liquid level sensor 9, according to which the oil temperature sensor 8 controls the start and stop of circulating heating, and the liquid level sensor 9 controls the supply of an external oil source Enter and stop. The height corresponding to the high level signal of the liquid level sensor 9 in the main area 1a of the oil tank is lower than the lowest position of the overflow channel 10. A throttle ring is provided between the return valve 5 and the return port 15. The pipeline of the oil injection pipe 11 is provided with a flow regulating valve. The oil tank main area 1a and the oil tank auxiliary area 1b are respectively provided with oil filling ports 7 respectively. The oil outlet valve 3 is connected to the oil outlet connector 2 and supplies oil to the internal combustion engine group through the oil outlet connector 2.

When in use, you can proceed as follows:

1) Control the oil in the main zone 1a of the oil tank above the set lower limit of the main zone oil level and below the upper limit of the main zone oil level, start the circulating pump 6 and the electromagnetic induction heating tube 4, open the return valve 5, shut off the oil valve 3. The oil is continuously circulated and heated between the main area 1a of the oil tank and the electromagnetic induction heating tube 4. After the oil temperature in the main area rises to the set temperature range, the oil is added to the main area 1a of the oil tank, and the amount of oil replenishment is ensured in the circulation. After heating, the oil temperature can still be kept within the set range. The oil level in the main zone is continuously increased by replenishing oil. When replenishing oil, the oil in the sub-zone 1b of the oil tank is used first, only when the oil level in the sub-zone is low or Only when the oil temperature in the main zone and the oil zone in the auxiliary zone reach the set temperature, the oil is supplied from the external oil source;

2) When the oil level in the main zone 1a of the oil tank reaches the upper limit of the oil level in the main zone, continue oil replenishment and circulating heating, so that the oil reaching the set temperature range will overflow into the sub-zone 1b of the oil tank until it reaches the sub-zone 1b The oil reaches the upper limit of the oil level of the auxiliary zone; stop filling the oil tank 1a;

3) Start the oil injection pump 13 to circulate oil in the oil tank main area 1a and oil tank auxiliary area 1b, and at the same time, the electromagnetic induction heating tube 4 continues to work to maintain the oil temperature in the oil tank main area 1a and oil tank auxiliary area 1b Within the set temperature range, when the upper limit of the set temperature is reached, the pump is stopped, the valve is closed and the electromagnetic induction heating tube 4 is powered off, and when the oil temperature drops to the lower limit of the set temperature, it is started again.

In steps 1), 2), 3), whenever the oil temperature in the main zone reaches the set temperature range, close the return valve 5, open the oil valve 3, and supply oil to the outside world; when the oil tank main zone 1a When the oil level drops to the lower limit of the set oil level in the main zone, the oil valve 3 is closed.

The biggest feature of this scheme is that the oil in the main area 1a of the oil tank is heated by electromagnetic induction, and the oil in the auxiliary area 1b of the oil tank is heated by the thermal insulation and oil filling of the main area 1a of the oil tank. That is, after the main section 1a oil tanks the oil is heated to a preheating temperature T _pre, while continuing the electromagnetic induction heating, the oil in the oil cabinet sub-region 1b at a flow rate adjusted in real time, so as to maintain the oil temperature constant region of the main injection mode oil Cabinet main area 1a. 1a the oil filled cabinet main area, to a preheating temperature T _pre oil as an overflow into the sub-region 1b oil tanks, oil tanks until the oil reaches the sub-region 1b (T _{pre - ΔT} _difference). The ΔT _difference is the temperature _difference between the two oil zones, and also the allowable lower deviation in the preheating temperature zone. _The normal temperature of T is 80-85℃, and the temperature of the oil is about 150-155℃.

After the oil temperature in the sub-zone 1b of the oil tank reaches (Tpre _- ΔT _difference ), the maximum flow (constant flow) of heat preservation and oil injection in the main area 1a of the oil tank is used to continue injecting oil into the main area 1a of the oil tank. While reducing electromagnetic induction heating power, counters the oil in the main oil region 1a without exceeding the preheating temperature T _pre for two zone heat oil, i.e. oil double insulation region.

When the oil tank main zone 1a heat preservation oil injection heating cannot produce overflow return, that is, when the total oil storage of the two oil zones is not greater than the oil tank main zone 1a oil storage, then the oil tank auxiliary zone 1b oil is below its lower limit ，Can add oil to the main area 1a of the oil tank through the external oil source.

The above-mentioned heat preservation and oil injection heating of the main area 1a of the oil tank is proposed based on the electrothermal conversion principle. Suppose the electromagnetic induction heating power is P(W), the temperature difference between the two oil areas (the oil temperature in the main area of the oil tank is high) is ΔT _difference (℃), and the oil injection flow rate is L/h (Kg/h). Without considering the heat loss, when the electromagnetic induction heats the oil in the main area 1a of the oil tank, the heat injected per hour is 0.86P(Kcal). The heat absorbed by the oil injected into the oil tank main zone 1a per hour is L·ΔT _difference (Kcal). When the L·ΔT _difference = 0.86P, the electromagnetic induction is realized under the condition that the oil tank main zone 1a oil temperature remains unchanged. The oil injected in the auxiliary area 1b of the oil tank is heated with power P. When the oil continues fueling area 1a of the main cabinet full temperature T _pre, flow rate L / h of oil by the oil tanks of oil return main section 1a overflow counters sub region 1b, and the sub-oil tanks of oil heated region 1b , Namely the oil tank main area 1a heat preservation oil injection heating oil tank auxiliary area 1b oil. This heating process is equivalent to the condition that the oil temperature in the main area 1a of the oil tank remains unchanged, and the electromagnetic induction directly heats the oil in the auxiliary area 1b of the oil tank with power P(W).

Process oil tanks 1a holding the main heating zone lubrication oil tanks of oil sub region 1b, as the sub-region 1b oil tanks of oil heated up, the temperature difference ΔT the _{difference between the} two sections the oil gradually decreases, oiling flow L / H for an increased real-time adjustment to keep the oil tanks of oil temperature T of main section 1a _preinvex. When the oil injection volume L/H is large enough, the ΔT _difference approaches zero, and the oil temperatures in the two oil regions are approximately equal.

When the dual oil zone is insulated (there is an overflow to return to the tank sub-zone 1b), the temperature difference ΔT _difference between the two oil zones is 0.86P/L. Reducing the electromagnetic induction heating power P and using the largest possible flow rate L/h, the temperature in the two oil zones will be closer to the same during the insulation process.

Considering the technical realization, the oil temperature feedback in the main area of the oil tank is used to control the oil injection flow through PID technology, and the preheating temperature zone of the oil temperature in the main area of the oil tank is controlled to ±3℃, and the minimum value of ΔT _{difference is} controlled within 5℃ , i.e. the main section 1a oil tanks oil preheat zones was _pre-T ± 3 ℃, the temperature of the outgoing bandwidth is fully meet the requirements of high-temperature oil.

In the process of the oil tank main area 1a reaching the temperature or the main area maintaining oil injection heating oil tank auxiliary area 1b oil, the oil tank main area 1a to the warm oil can be sent out at any time by electromagnetic induction heating. So as to meet the use requirements of priority delivery of some oil.

When both oil areas have reached the preheating temperature, the oil in the main area of the oil tank 1a and the oil in the auxiliary area of the oil tank 1b can be added to supplement the oil in the two areas to meet the requirements of continuous large-volume high-temperature oil use .

In the process of oil preheating in the main area of the oil tank 1a and its heat preservation and oil filling and heating of the oil in the auxiliary area of the oil tank 1b, the electromagnetic induction heating has been continuously running at the maximum allowable power, and its heating efficiency is the same as that of the existing single power electromagnetic induction single oil tank with the same power The heating method is equivalent.

The electric energy consumed by the oil injection pump 13 converts the kinetic energy of the oil flow into the heat energy of the main oil area during the oil injection process, so there is no electric energy consumption other than normal heat loss.

The present invention is not limited to the above embodiments. On the basis of the technical solutions disclosed by the present invention, those skilled in the art can make some replacements and some of the technical features based on the disclosed technical content without creative work. Variations, these replacements and variations are within the scope of the present invention.

Claims

A fuel temperature control system includes an oil storage cabinet. The oil outlet of the oil storage cabinet is connected to the inlet of the electromagnetic induction heating pipe through a circulation pump. The outlet of the electromagnetic induction heating pipe is divided into two paths, and one path is connected to the oil storage through a return valve The return port of the cabinet, another way to supply high-temperature hot oil to the outside world through an oil valve, characterized in that: the oil storage tank is provided with a longitudinal partition to divide the oil tank into the main area of the oil tank and the auxiliary area of the oil tank, The oil outlet and the return port of the oil conservator are set in the main area of the oil tank, and an overflow channel connecting the main area of the oil tank and the auxiliary area of the oil tank is left above the longitudinal partition; The inlet of the oil pump is connected, and the outlet of the oil injection pump is connected to the main area of the oil tank through the oil injection pipe; the volume ratio of the main area of the oil tank and the auxiliary area of the oil tank is 1: (2-5).
The fuel temperature control system according to claim 1, characterized in that: an oil temperature sensor and a liquid level sensor are respectively provided in the main area of the oil tank and the auxiliary area of the oil tank, and the oil is controlled by the oil temperature sensor to start and stop the circulating heating, The supply and stop of the external oil source are controlled by the liquid level sensor.
The fuel temperature control system according to claim 2, wherein the height corresponding to the high level signal of the liquid level sensor in the main area of the oil tank is lower than the lowest position of the overflow channel.
The fuel temperature control system according to any one of claims 1 to 3, wherein a throttle ring is provided between the return valve and the return port.
The fuel temperature control system according to any one of claims 1 to 3, wherein a flow regulating valve is provided on the pipeline of the fuel injection pipe.
The fuel temperature control system according to any one of claims 1 to 3, wherein the oil tank main area and the oil tank auxiliary area are respectively provided with oil filling ports.
A control method for a fuel temperature control system is characterized by the following steps:

1) Control the oil in the main zone of the oil tank to be above the set lower limit of the main zone oil level and below the upper limit of the main zone oil level, start the circulation pump and electromagnetic induction heating tube, open the return valve, and shut off the oil valve to keep the oil in Continuous heating between the main area of the oil tank and the electromagnetic induction heating tube, to keep the oil temperature in the main area rise to the set temperature range, replenish oil to the main area of the oil tank, to ensure that the oil temperature can still be maintained after the heating cycle Within the setting range, the oil level in the main zone is continuously increased by replenishing oil. When replenishing oil, the oil in the auxiliary zone of the oil tank is used first, only when the oil level in the auxiliary zone is low or the oil temperature in the main zone and the oil temperature in the auxiliary zone are both Only when the set temperature is reached, the oil is supplied from the external oil source;

2) When the oil level in the main area of the oil tank reaches the upper limit of the oil level in the main area, continue oil replenishment and circulating heating, so that the oil reaching the set temperature range will overflow into the auxiliary area of the oil tank until the oil in the auxiliary area of the oil tank reaches Set the upper limit of the oil level in the auxiliary zone; stop filling the oil tank main zone;

3) Start the oil injection pump to circulate oil in the main area of the oil tank and the auxiliary area of the oil tank. At the same time, the electromagnetic induction heating pipe continues to work to maintain the oil temperature in the main area of the oil tank and the auxiliary area of the oil tank within the set temperature range. When the upper limit of the set temperature is reached, the pump is stopped, the valve is closed and the electromagnetic induction heating tube is powered off, and when the oil temperature drops to the lower limit of the set temperature, it is started again.
A control method for a fuel temperature control system according to claim 7, characterized in that in steps 1), 2), 3), when the oil temperature in the main zone reaches the set temperature range at any time, the return valve is closed , Open the oil valve to supply oil to the outside world; when the oil level in the main area of the oil tank drops to the lower limit of the set oil level in the main area, close the oil valve.