Gas supply device of fuel gas and diesel oil dual-fuel engine

Abstract

The utility model relates to a gas supply device of a fuel gas and diesel oil dual-fuel engine, which comprises a fuel gas heat exchange assembly, an air heat exchange assembly and an auxiliary cooling assembly, and the fuel gas heat exchange assembly comprises a plurality of first fins, a fuel gas shunting part and a fuel gas converging part with a first temperature sensor. According to the gas supply device, the gas heat exchange assembly and the air heat exchange assembly are arranged for heat exchange, a heating device does not need to be additionally arranged for heating gas, the heat exchange degree is controlled through the temperature sensor, the outlet temperature of the gas heat exchange assembly and the outlet temperature of the air heat exchange assembly are consistent, and the uncertainty of the temperature after gas with the temperature difference is mixed is avoided; the temperature of the mixed gas is controlled within a controllable range, the optimal combustion effect is achieved, the auxiliary cooling assembly is arranged for heating to form triple heat exchange, redundant heat of the air heat exchange assembly is absorbed, and the heat exchange efficiency of the auxiliary cooling assembly and the air heat exchange assembly can be adjusted so that the optimal gas temperature can be achieved according to the reading of the temperature sensor.

Description

Technical Field

[0001] The utility model belongs to the technical field of dual-fuel engines, and particularly relates to a gas supply device for a gas-diesel dual-fuel engine. Background Technique

[0002] A dual-fuel engine is an engine that can use both fuel oil and natural gas (or other gaseous fuels such as liquefied petroleum gas) as fuels. This type of engine has the ability to switch between fuel oil and gas modes and is usually equipped with two independent fuel supply systems, one for supplying natural gas or liquefied petroleum gas, and the other for supplying other fuels except natural gas. Dual-fuel engines are widely used in the ship field, especially on large ocean-going ships. Because they can flexibly switch fuels and adapt to fuel supply situations in different regions, they are highly favored.

[0003] The gas supply system of a dual-fuel engine includes supplying gas and supplying air. Since the air needs to be turbocharged and the air temperature is relatively high during the process, it needs to be cooled by an intercooler before entering the engine. While the gas is decompressed by a high-pressure gas storage tank and the temperature drops during the process, it needs to be heated before entering the fuel injector. And in order to improve the combustion ratio, a series of precise control systems are required to control the intake flow rate of the gaseous fuel. The existing intercooler and the heating device for gas cannot control the heat exchange degree, which may lead to overheating or overcooling. The temperature after the gas and air are mixed cannot be controlled and may exceed the optimal temperature range. Content of the Utility Model

[0004] The purpose of the utility model is to provide a gas supply device for a gas-diesel dual-fuel engine in order to solve the above problems.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] A gas supply device for a gas-diesel dual-fuel engine includes

[0007] A gas heat exchange assembly, including a plurality of first fins, a gas shunt part, and a gas confluence part with a first temperature sensor;

[0008] An air heat exchange assembly, including a plurality of double-connected second fins, an air shunt part, and an air confluence part with a second temperature sensor. The flow directions of the first fins and the second fins are opposite, and the first fins slide into the gaps between the second fins to complete heat exchange, and the degree of the first fins entering the gaps is controlled according to the temperature difference between the first temperature sensor and the second temperature sensor, so that the temperatures of the two confluence parts are the same or close. Among them, there is a gap in the middle of the double-connected second fins;

[0009] An auxiliary cooling component, which is used to supplement the cooling effect, includes a plurality of third fins that slide into the gap. The third fins help the second fins dissipate heat by entering the gap, so that the temperature of the temperature sensor is within the set range.

[0010] As a further optimization scheme of the present utility model, the gas shunt part and the gas confluence part are connected to the upper and lower ends on the same side of the first fin, and the air shunt part and the air confluence part are connected to the upper and lower ends on the same side of the second fin. By connecting the gas shunt part and the gas confluence part to the same side of the first fin, the first fin can slide horizontally and overlap with the second fin in an interleaved manner for heat exchange. The adjustment range of the interleaved overlap degree on the side is larger, and there is no obstruction at the upper and lower ends of the fin. The auxiliary cooling component can enter the gap from above or below for triple heat exchange.

[0011] As a further optimization scheme of the present utility model, partition bars are provided inside both the first fin and the second fin to form a plurality of air flow channels. Except for the air flow channel farthest from the confluence part, turning plates are provided at positions close to the outlet of the remaining air flow channels. The shaft part of the turning plate is located at the center and is used to block the air flow channel. A wind receiving plate extends downward from the center of the bottom of the turning plate, which is used to make the air flow preferentially pass through the air flow channel farthest from the confluence part. Since the above-mentioned confluence part and the shunt part are both on the same side, when the flow rate is small, the air flow may flow only along one side of the confluence part / shunt part. The overlapping part of the first fin and the second fin is on the opposite side. Therefore, partition bars and turning plates are provided to make the air flow preferentially flow through the overlapping part of the first fin and the second fin.

[0012] As a further optimization scheme of the present utility model, the gas supply device further includes a packaging part. The air heat exchange component is fixed inside the packaging part, and the gas heat exchange component is driven by a first telescopic member to be slidably arranged inside the packaging part. The first telescopic member can be a cylinder, and a sliding guide rail for the gas heat exchange component can also be provided inside the packaging part.

[0013] As a further optimization scheme of the present utility model, the pipeline connecting the gas heat exchange component to the outside is a corrugated pipe to facilitate the sliding of the gas heat exchange component.

[0014] As a further optimization scheme of the present utility model, the third fin is driven to lift by a second telescopic member and enters the gap from the side close to the air shunt part, and is connected to an external water supply / return device through a pair of hoses. Entering the gap from the side close to the air shunt part can first cool the high-temperature air, and then the appropriately cooled air exchanges heat with the low-temperature gas to reach the same temperature.

[0015] As a further optimization solution of the present utility model, a plurality of diversion grooves are formed in the third fin, and the bottoms of the diversion grooves are all communicated. Among them, the diversion grooves are divided into an inflow groove and a return groove which are arranged at intervals. The inflow grooves are commonly communicated with a secondary shunt portion, and the return grooves are commonly communicated with a secondary confluence portion. In order to improve the heat exchange efficiency between the third fin and the second fin, the medium of the third fin enters from the upper end and returns. In order to improve the flow uniformity, the inflow grooves and the return grooves are arranged at intervals, and the secondary shunt portion and the secondary confluence portion are respectively used for shunting / confluence.

[0016] As a further optimization solution of the present utility model, the secondary shunt portion and the secondary confluence portion are respectively communicated with a water tank, and the two water tanks are respectively connected with a pair of hoses. For the secondary confluence portion and the secondary shunt portion on each third fin, two water tanks are also provided for further aggregation. One water tank is communicated with all the secondary confluence portions, and the other water tank is communicated with all the secondary shunt portions, so as to uniformly allocate the medium through the hoses.

[0017] The beneficial effects of the present utility model are as follows:

[0018] The present utility model exchanges heat by arranging a gas heat exchange component and an air heat exchange component, without the need to additionally arrange a heating device to heat the gas, and controls the heat exchange degree through a temperature sensor, so that the outlet temperatures of the two reach consistency, avoiding the uncertainty of the temperature after the gases with temperature differences are mixed, making the temperature of the mixed gas within a controllable range, achieving the best combustion effect, and arranging an auxiliary cooling component to form triple heat exchange, absorbing the excess heat of the air heat exchange component, and the heat exchange efficiency between the auxiliary cooling component and the air heat exchange component can also be adjusted to reach the best gas temperature according to the indication of the temperature sensor. Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the present utility model;

[0020] Figure 2 is the top view of the gas heat exchange component and the air heat exchange component of the present utility model;

[0021] Figure 3 is the cross-sectional view of the first fin and the second fin of the present utility model;

[0022] Figure 4 is the enlarged view of the second fin of the present utility model;

[0023] Figure 5 is of the present utility model Figure 4 view in the direction of A-A;

[0024] Figure 6 is of the present utility model Figure 5 enlarged view of part B;

[0025] Figure 7 is the front view cross-sectional view of the third fin of the present utility model;

[0026] Figure 8 is the side view cross-sectional view of the third fin of the present utility model;

[0027] In the figure: 1. Gas heat exchange component; 11. Gas shunt part; 12. Gas confluence part; 13. First fin; 14. First temperature sensor; 15. First telescopic part; 2. Air heat exchange component; 21. Air confluence part; 22. Air shunt part; 23. Second fin; 24. Partition strip; 25. Gap; 26. Rotating plate; 27. Wind receiving plate; 28. Second temperature sensor; 3. Auxiliary cooling component; 31. Third fin; 32. Flow guide groove; 33. Secondary shunt part; 34. Secondary confluence part; 35. Water tank; 36. Hose; 37. Second telescopic part; 4. Encapsulation part. Detailed implementation manners

[0028] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following detailed implementation manners are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0029] Embodiment 1

[0030] As Figure 1-8 shown, a gas supply device for a gas-diesel dual-fuel engine includes

[0031] a gas heat exchange component 1, including a plurality of first fins 13, a gas shunt part 11, and a gas confluence part 12 with a first temperature sensor 14;

[0032] an air heat exchange component 2, including a plurality of double-connected second fins 23, an air shunt part 22, and an air confluence part 21 with a second temperature sensor 28. The flow directions of the first fins 13 and the second fins 23 are opposite, and the first fins 13 slide into the gaps between the second fins 23 to complete heat exchange, and the degree of the first fins 13 entering the gaps is controlled according to the temperature difference between the first temperature sensor 14 and the second temperature sensor 28, so that the temperatures of the two confluence parts are the same or close. Among them, there is a gap 25 between the double-connected second fins 23;

[0033] an auxiliary cooling component 3, which is used to supplement the cooling effect, including a plurality of third fins 31 that slide into the gap 25, and it helps the second fins 23 dissipate heat by entering the gap 25, so that the temperature of the temperature sensor is within the set range.

[0034] In this solution, heat exchange is carried out by setting up a gas heat exchange component 1 and an air heat exchange component 2. There is no need to additionally set up a heating device to heat the gas. Moreover, the heat exchange degree is controlled by a temperature sensor to make the outlet temperatures of the two reach the same, avoiding the uncertainty of the temperature after the gases with temperature differences are mixed, keeping the temperature of the mixed gas within a controllable range, achieving the best combustion effect, and setting up an auxiliary cooling component 3 to form triple heat exchange, absorbing the excess heat of the air heat exchange component 2, and the heat exchange efficiency between the auxiliary cooling component 3 and the air heat exchange component 2 can also be adjusted to reach the optimal gas temperature according to the reading of the temperature sensor.

[0035] It should be noted that since the oxygen content in the air is about 21%, and 1 mol of gas (taking methane as an example) requires 2 mol of oxygen for combustion, during heat exchange, the air flow rate is greater than that of the gas. Fins with different size ratios or quantity ratios can be set as needed, and the heat energy contained in the air is much greater than the heat required for methane heating. Therefore, only the air heat exchange component 2 needs to be assisted in cooling.

[0036] The gas shunt part 11 and the gas confluence part 12 are connected to the upper and lower ends on the same side of the first fin 13, and the air shunt part 22 and the air confluence part 21 are connected to the upper and lower ends on the same side of the second fin 23. By connecting the gas shunt part 11 and the gas confluence part 12 on the same side of the first fin 13, the first fin 13 can slide horizontally and overlap with the second fin 23 in a staggered manner for heat exchange. The adjustment range of the degree of staggered overlap on the side is larger, and there is no blockage at the upper and lower ends of the fin, so that the auxiliary cooling component 3 can enter the gap 25 of the second fin 23 from above or below for triple heat exchange.

[0037] Partition bars 24 are arranged inside both the first fin 13 and the second fin 23 to form several air flow channels. Except for the air flow channel farthest from the confluence part, flow deflectors 26 are arranged at the positions close to the outlet of the remaining air flow channels. The shaft part of the flow deflector 26 is located at the center and is used to block the air flow channels, and a wind receiving plate 27 extends downward from the center of the bottom of the flow deflector 26, which is used to make the air flow preferentially pass through the air flow channel farthest from the confluence part. Since the above-mentioned confluence part and shunt part are both on the same side, when the gas flow rate is small, the air flow may flow only along one side of the confluence part / shunt part. As Figure 5 shown, both the inlet and outlet of the second fin 23 are on the right side, so the gas returns through the right-side air flow channel, and the overlapping part of the first fin 13 and the second fin 23 is on the opposite side, that is, the heat exchange part is on the left side of the second fin 23, which will cause the heat exchange effect to be not obvious when the gas flow rate is small. Therefore, the partition bars 24 and the flow deflectors 26 are set to make the air flow preferentially flow through the overlapping part of the first fin 13 and the second fin 23.

[0038] Specifically, still referring to Figure 5, the axis of the turning plate 26 is located at the center. Therefore, the pressure difference of the turning plate itself cannot open the turning plate 26, and the air flow needs to bypass the leftmost air flow channel. Since the air flow flows from left to right at the lowermost end of the second fin 23, the air flow preferentially blows the leftmost turning plate wind receiving plate 27, causing the turning plate 26 to tilt for air intake. As the left wind receiving plate 27 opens, a pressure difference is generated on both sides of the right wind receiving plate 27, and this wind receiving plate 27 is also blown up. By analogy, the turning plate 26 is gradually opened from left to right. In order to achieve the best air flow for the turning plate 26, a protrusion can also be set to limit the position when the turning plate 26 reaches the best opening angle.

[0039] The air supply device further includes a packaging part 4. The air heat exchange component 2 is fixed in the packaging part 4. The gas heat exchange component 1 is driven by a first telescopic member 15 to be slidably arranged in the packaging part 4. The first telescopic member 15 can be a cylinder. A sliding guide rail for the gas heat exchange component 1 can also be arranged in the packaging part 4. The pipeline through which the gas heat exchange component 1 communicates with the outside is a corrugated pipe to facilitate the sliding of the gas heat exchange component 1.

[0040] The third fin 31 is driven to lift by a second telescopic member 37, and enters the gap 25 from the side close to the air shunt part 22, and is connected to an external water supply / return device through a pair of hoses 36. Entering the gap 25 from the end close to the air shunt part 22 can first cool the high-temperature air, and then the appropriately cooled air exchanges heat with the low-temperature gas so that the gas and the air reach the same temperature.

[0041] A number of diversion grooves 32 are formed in the third fin 31, and the bottoms of the diversion grooves 32 are all connected. Among them, the diversion grooves 32 are divided into an inflow groove and a return groove arranged at intervals. The inflow grooves are commonly connected to a secondary shunt part 34, and the return grooves are commonly connected to a secondary confluence part 33. In order to improve the heat exchange efficiency between the third fin 31 and the second fin 23, the medium of the third fin 31 enters from the upper end and returns. In order to improve the uniformity of the flow, the inflow groove and the return groove are arranged at intervals, and the secondary shunt part 33 and the secondary confluence part 34 are used for shunting / confluence respectively.

[0042] The secondary shunt part 34 and the secondary confluence part 33 are respectively connected to a water tank 35, and the two water tanks 35 are respectively connected to a pair of hoses 36. For the secondary confluence part 34 and the secondary shunt part 33 on each third fin 31, two water tanks 35 are also provided for further aggregation. One water tank 35 is connected to all secondary confluence parts 34, and the other water tank 35 is connected to all secondary shunt parts 33 to uniformly allocate the medium through the hoses 36.

[0043] The specific implementation method is as follows: during heat exchange, the fuel gas enters the first fin 13 from bottom to top, and the air enters the second fin 23 from top to bottom. To prevent excessive heat exchange, the overlapping degree of the first fin 13 and the second fin 23 is controlled by the temperature difference between the first temperature sensor 14 and the second temperature sensor 28, so that the discharged temperatures of the two are the same or close, preventing uncontrollable temperature caused by mixing. Since the temperature after heat exchange of the two is still higher than the set optimal intake air temperature, the auxiliary cooling component 3 is used to perform liquid cooling on the air, and the overlapping degree of the third fin 31 and the second fin 23 is controlled by the first temperature sensor 14 and the second temperature sensor 28. When diesel is used as fuel, the first fin 13 and the second fin 23 are separated from overlapping, and only the third fin 31 dissipates heat from the second fin 23.

[0044] The above embodiments only represent several implementation methods of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An air supply device for a gas-diesel dual-fuel engine, characterized in that: including a gas heat exchange component (1), including a plurality of first fins (13), a gas shunt part (11), and a gas confluence part (12) with a first temperature sensor (14); an air heat exchange component (2), including a plurality of double-connected second fins (23), an air shunt part (22), and an air confluence part (21) with a second temperature sensor (28). The flow directions of the first fins (13) and the second fins (23) are opposite, and the first fins (13) slide into the gaps between the second fins (23) to complete heat exchange, and the degree of the first fins (13) entering the gaps is controlled according to the temperature difference between the first temperature sensor (14) and the second temperature sensor (28) so that the temperatures of the two confluence parts are the same or close. Among them, there is a gap (25) in the middle of the double-connected second fins (23); an auxiliary cooling component (3) used to supplement the cooling effect, including a plurality of third fins (31) that slide into the gap (25), which helps the second fins (23) dissipate heat by entering the gap (25) so that the temperature of the temperature sensor is within the set range.

2. The gas supply device of the gas-diesel dual-fuel engine according to claim 1, characterized in that: The gas shunt part (11) and the gas confluence part (12) are connected to the upper and lower ends on the same side of the first fins (13), and the air shunt part (22) and the air confluence part (21) are connected to the upper and lower ends on the same side of the second fins (23).

3. The gas supply device of the gas-diesel dual-fuel engine according to claim 2, characterized in that: Partition bars (24) are arranged inside both the first fins (13) and the second fins (23) to form a plurality of air flow channels. Except for the air flow channels farthest from the confluence part, flow deflectors (26) are arranged at positions close to the outlets of the remaining air flow channels. The shaft part of the flow deflector (26) is located at the center and is used to block the air flow channels, and a wind-receiving plate (27) extends downward from the center of the bottom of the flow deflector (26), which is used to make the air flow preferentially pass through the air flow channels farthest from the confluence part.

4. The gas supply device of the gas-diesel dual-fuel engine according to claim 1, characterized in that: The gas supply device further includes an encapsulation part (4). The air heat exchange component (2) is fixed inside the encapsulation part (4), and the gas heat exchange component (1) is driven by a first telescopic member (15) to be slidably arranged inside the encapsulation part (4).

5. The gas supply device of the gas-diesel dual-fuel engine according to claim 4, characterized in that: The pipeline of the gas heat exchange component (1) communicating with the outside is a corrugated pipe.

6. The gas supply device of the gas-diesel dual-fuel engine according to claim 1, characterized in that: The third fins (31) are driven to lift by a second telescopic member (37), enter the gap (25) from the side close to the air shunt part (22), and are connected to an external water supply / return device through a pair of hoses (36).

7. The gas supply device of the gas-diesel dual-fuel engine according to claim 6, characterized in that: A plurality of flow guide grooves (32) are formed inside the third fins (31), and the bottoms of the flow guide grooves (32) are all connected. Among them, the flow guide grooves (32) are divided into an inflow groove and a return groove arranged at intervals. The inflow grooves are commonly connected to a secondary shunt part (34), and the return grooves are commonly connected to a secondary confluence part (33).

8. The gas supply device of the gas-diesel dual-fuel engine according to claim 7, characterized in that; The secondary shunt part (34) and the secondary confluence part (33) are respectively connected to a water tank (35), and the two water tanks (35) are respectively connected to a pair of hoses (36).

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