A liquid nitrogen refrigerated truck with a temperature difference power generation device

Abstract

The present invention discloses a liquid nitrogen refrigerated truck with a temperature difference power generation device, including a refrigerated box, wherein the refrigerated box has an equipment room and a food refrigerated room, the equipment is provided with a liquid nitrogen tank and a fan, the outlet of the liquid nitrogen tank is connected to the atomizer through a pressure reducing valve, the fan is arranged above the food refrigerated room, so as to blow the atomized liquid nitrogen horizontally, and enter the food refrigerated room through the orifice plate at the upper end of the food refrigerated room, and the pressure difference formed by the fan causes the gas in the food refrigerated room to enter the equipment room through the air valve to achieve gas circulation; and also includes a car exhaust temperature difference power generation device, which is used to collect high-temperature exhaust gas discharged by the car as a heat source and collect low-temperature gas discharged from the external atmosphere and\or the food refrigerated room as a cold source for temperature difference power generation. The present invention realizes the centralized and effective utilization of low-temperature nitrogen discharged by overpressure from the liquid nitrogen refrigerated truck.

Description

Technical Field

[0001] The invention relates to the technical field of liquid nitrogen refrigerated vehicles, and in particular to a liquid nitrogen refrigerated vehicle with a temperature difference power generation device. Background Art

[0002] With the development of my country's economy and society, people's material living standards are constantly improving, and consumers' requirements for the timeliness of food supply are also increasing. In order to meet users' requirements for food quality, refrigerated trucks came into being. Liquid nitrogen refrigerated trucks are the third generation of new refrigerated trucks after mechanical refrigeration and cold storage plate refrigeration. They can spray liquefied gas directly into the refrigerated compartment, which can achieve the purpose of extremely fast refrigeration and food preservation. But at the same time, due to the continuous increase in the number of liquid nitrogen refrigerated vehicles, their energy consumption has also increased. At present, the existing liquid nitrogen refrigerated trucks on the market generally release the excess low-temperature nitrogen in the refrigerated truck directly into the atmosphere through the safety exhaust valve to balance the pressure in the refrigerated truck, resulting in a certain degree of resource waste. Summary of the invention

[0003] The purpose of the present invention is to more efficiently utilize the cooling capacity of a liquid nitrogen refrigerated truck and reduce the energy consumption of the refrigerated truck, and to provide a liquid nitrogen refrigerated truck with a temperature difference power generation device, by effectively utilizing the heat carried by the exhaust gas of the liquid nitrogen refrigerated truck and the excess cooling capacity generated by the vaporization of liquid ammonia discharged by the refrigerated truck, so as to achieve energy saving and environmental protection and improve the power generation efficiency of the refrigerated truck.

[0004] The technical solution adopted to achieve the purpose of the present invention is:

[0005] A liquid nitrogen refrigerated vehicle with a temperature difference power generation device comprises a refrigerated box, wherein the refrigerated box has an equipment room and a food refrigerated room, the equipment is provided with a liquid nitrogen tank and a fan, the outlet of the liquid nitrogen tank is connected to an atomizer at the end via a pressure reducing valve, the fan is arranged above the food refrigerated room to blow the atomized liquid nitrogen horizontally, and enter the food refrigerated room through a perforated plate at the upper end of the food refrigerated room, and the pressure difference formed by the fan causes the gas in the food refrigerated room to enter the equipment room via a wind valve to achieve gas circulation; and also comprises an automobile exhaust temperature difference power generation device, which is used to collect high-temperature exhaust gas discharged by the automobile as a heat source and collect low-temperature gas discharged from the external atmosphere and / or the food refrigerated room as a cold source to perform temperature difference power generation.

[0006] The automobile exhaust temperature difference power generation device includes two cold layer boxes with an insulation layer on the outside, a flat plate collector placed between the two cold layer boxes, and a temperature difference power generation sheet adhered to the outer surface of the flat plate collector and bonded to the cold layer boxes; the cold layer box has a cold layer box inlet and a cold layer box outlet for the entry and exit of low-temperature gas as a cold source, and the air inlet end of the flat plate collector is connected to the exhaust gas pipeline.

[0007] The thermoelectric power generation sheet includes a P-type semiconductor and an N-type semiconductor, and a plurality of the P-type semiconductors and the N-type semiconductors are arranged alternately to form the thermoelectric power generation sheet.

[0008] The low-temperature gas inlet of the cold layer box is connected to the overpressure exhaust port of the liquid nitrogen refrigeration room through a pressure control valve, and is connected to a solenoid valve through a branch pipe connected to the side wall to control the introduction of external atmosphere.

[0009] A pressure sensor and a temperature sensor are arranged in the food refrigeration room. The pressure control valve and the solenoid valve are controlled by the pressure sensor, and the pressure reducing valve is controlled by the temperature sensor.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The centralized and effective utilization of low-temperature nitrogen discharged from overpressure in liquid nitrogen refrigerated trucks is realized, which further reduces the cold source temperature of the thermoelectric power generation device, improves the efficiency of thermoelectric power generation, and achieves the purpose of energy conservation and emission reduction.

[0012] 2. The perforated plate at the top of the food cold storage room optimizes the airflow organization inside the cold storage room, achieves the effect of uniform air supply, and further improves the effect of food refrigeration and preservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of a liquid nitrogen refrigerated truck with a temperature difference power generation device;

[0014] Figure 2 It is a structural schematic diagram of a temperature difference power generation device;

[0015] Figure 3 This is a schematic diagram of the connection between the temperature difference power generation sheet, the cold layer box, and the flat-plate collector.

[0016] In the figure: 1-refrigerated box; 2-orifice plate; 3-blower; 4-atomizer; 5-pressure reducing valve; 6-manual stop valve; 7-liquid nitrogen tank; 8-automobile power system; 9-air valve; 10-exhaust pipe; 11-thermoelectric power generation device; 12-solenoid valve; 13-pressure control valve; 14-cold layer box; 15-cold layer box outlet; 16-N-type semiconductor; 17-P-type semiconductor; 18-flat plate collector; 19-cold layer box inlet, 20-thermoelectric power generation sheet, 21-food cold storage room; 22-equipment room; 23-pressure sensor; 24-temperature sensor; 25-U-shaped pipe. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] like Figure 1As shown, the liquid nitrogen refrigerated vehicle with a temperature difference power generation device of the present invention comprises: a refrigerated box 1; an orifice plate 2; a fan 3; an atomizer 4; a pressure reducing valve 5; a manual stop valve 6 for controlling the injection of liquid nitrogen into a liquid nitrogen tank 7; a liquid nitrogen tank 7; a vehicle power system 8; a wind valve 9; an exhaust pipe 10; a temperature difference power generation device 11; a solenoid valve 12; a pressure control valve 13; a cold layer box 14; a cold layer box outlet 15; an N-type semiconductor 16; a P-type semiconductor 17; a flat plate collector 18; a cold layer box inlet 19; a temperature difference power generation sheet 20; a food refrigeration room 21; an equipment room 22; a pressure sensor 23; a temperature sensor 24; and a U-shaped pipe 25.

[0019] When the liquid nitrogen refrigerated truck is in operation, Figure 1 As shown, when the temperature value collected by the temperature sensor 24 in the food cold storage room 21 is higher than the set value, the pressure reducing valve 5 set in the equipment room 22 of the liquid nitrogen refrigerated transport vehicle is opened, and the liquid nitrogen in the liquid nitrogen tank 7 is atomized by the atomizer 4 and then blown horizontally by the fan 3, and then enters the food cold storage room through the orifice plate 2. The liquid ammonia entering the food cold storage room vaporizes rapidly, absorbs a large amount of heat from the surrounding environment, and reduces the air temperature. The low-temperature gas in the cold storage room exchanges heat with the food to achieve the purpose of food preservation.

[0020] When the temperature value collected by the temperature sensor 24 in the cold storage room is lower than the set temperature, the pressure reducing valve 5 in the equipment room is closed. As the amount of liquid ammonia delivered increases and the volume expands dramatically after vaporization, the pressure in the food cold storage room increases. When the pressure collected by the pressure sensor 23 in the cold storage room is greater than the set pressure, the pressure control valve 13 opens and the solenoid valve 12 closes. The excess low-temperature vaporized nitrogen in the cold storage room enters the temperature difference power generation device 11 located at the bottom of the car through the pressure control valve 13. When the pressure collected by the pressure sensor 23 in the cold storage room is less than the set pressure. The pressure control valve 13 is closed and the solenoid valve 12 is opened. The air in the external environment enters the temperature difference power generation device 11 located at the bottom of the car through the solenoid valve 12.

[0021] When the low-temperature gas enters the thermoelectric power generation device, the operating conditions are as follows: Figure 2 As shown, the low temperature gas enters the cold layer box 14 through the cold layer box inlet 19 and becomes the cold source of the temperature difference power generation device. At the same time, the exhaust gas discharged by the automobile power system 8 during the driving process of the automobile enters the flat plate collector 18 in the temperature difference power generation device 11 through the exhaust pipe 10 and becomes the heat source of the temperature difference power generation device 11.

[0022] A thermoelectric power generation sheet 20 composed of a P-type semiconductor 17 and an N-type semiconductor 16 and installed between the cold layer box 14 and the flat plate collector 18 through thermal conductive silicone (the upper and lower surfaces of the thermoelectric power generation sheet 20 are respectively bonded to the cold layer box 14 and the flat plate collector 18 through thermal conductive silicone) generates electric energy under the action of temperature difference. The thermoelectric power generation sheet 20 can be connected to a battery, such as a car battery, to charge the corresponding battery to supply the electric energy required by the power-consuming equipment of the refrigerated truck, thereby achieving energy saving and environmental protection.

[0023] The flat-plate collector 18 is clamped between two cold layer boxes 14, each cold layer box 14 has a cold layer box inlet 19 and a cold layer box outlet 15 to introduce and discharge low-temperature gas, wherein the two cold layer box inlets 19 are connected to a pipe installed with a pressure control valve 13 through a U-shaped pipe 25 at the rear end, and the pipe installed with the pressure control valve 13 is connected to a branch pipe of the solenoid valve.

[0024] The thermoelectric power generation device of the present invention is designed for liquid nitrogen refrigerated trucks and can make better use of excess low-temperature nitrogen. Thermoelectric power generation is a new energy technology that directly converts thermal energy into electrical energy through temperature difference. It has excellent performances such as no noise, no pollution, and zero emissions when working.

[0025] Compared with the existing automobile temperature difference power generation device, most of the cold sources are natural wind, but due to the limited temperature difference between air and automobile exhaust, the power generation efficiency is low.

[0026] The present invention utilizes the cold energy generated by the vaporization of liquid nitrogen in the refrigerated truck and the heat of automobile exhaust gas to generate electricity through temperature difference, thereby improving the power generation efficiency and meeting the national requirements for energy conservation and environmental protection.

[0027] The present invention utilizes the low-temperature nitrogen discharged by the refrigerated truck under overpressure to further reduce the cold source temperature of the thermoelectric power generation device, improve the efficiency of thermoelectric power generation, and achieve the purpose of energy saving and emission reduction. At the same time, the orifice plate optimizes the airflow organization inside the cold storage room, achieves the effect of uniform air supply, and further improves the effect of food refrigeration and preservation.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A liquid nitrogen refrigerated truck with a temperature difference power generation device, comprising a refrigerated box, wherein the refrigerated box has an equipment room and a food refrigeration room, characterized in that: The equipment room is provided with a liquid nitrogen tank and a fan, the outlet of the liquid nitrogen tank is connected to the atomizer at the end through a pressure reducing valve, the fan is arranged above the food cold storage room to blow the atomized liquid nitrogen horizontally, and enter the food cold storage room through the orifice plate at the upper end of the food cold storage room, and the pressure difference formed by the fan causes the gas in the food cold storage room to enter the equipment room through the air valve to achieve gas circulation; it also includes an automobile exhaust temperature difference power generation device, which is used to collect high-temperature exhaust gas discharged by the automobile as a heat source and collect low-temperature gas discharged from the external atmosphere and the food cold storage room as a cold source to perform temperature difference power generation; The automobile exhaust temperature difference power generation device comprises two cold layer boxes with an insulation layer on the outside, a flat plate heat collector placed between the two cold layer boxes, and a temperature difference power generation sheet adhered to the outer surface of the flat plate heat collector and bonded to the cold layer boxes; the cold layer box has a cold layer box inlet and a cold layer box outlet for the low-temperature gas as a cold source to enter and exit, and the air inlet end of the flat plate heat collector is connected to the exhaust pipe; The thermoelectric power generation sheet includes a P-type semiconductor and an N-type semiconductor, and a plurality of the P-type semiconductors and the N-type semiconductors are arranged alternately to form the thermoelectric power generation sheet; The inlet of the cold layer box is connected to the overpressure exhaust port of the liquid nitrogen refrigeration room through a pressure control valve, and a branch pipe connected to the pipe installed with the pressure control valve is connected to a solenoid valve to control the introduction of external atmosphere; A pressure sensor and a temperature sensor are arranged in the food cold storage room. The pressure control valve and the solenoid valve are controlled by the pressure sensor, and the pressure reducing valve is controlled by the temperature sensor.

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