CN204404851U - Liquid nitrogen pump vehicle waste heat recovery heat-exchange system - Google Patents

Abstract

A waste heat recovery heat exchange system for a liquid nitrogen pump truck, including an exhaust device for the power system of the pump truck, a liquid nitrogen storage device, and a heat exchanger for waste heat reuse. The heat exchanger for waste heat reuse includes a shell and pipe boxes connected at both ends The housing is respectively provided with shell-side inlet and outlet pipes, and multiple sets of heat exchange tubes are installed inside the housing through the tube sheets on both sides, and the heat exchange tubes are respectively connected to the tube-side inlet and outlet pipes on the tube box; In the casing, a plurality of baffles are arranged at intervals through a plurality of transverse tie rods to form a circuitous fluid channel, and the two ends of the fluid channel are respectively connected with the inlet and outlet pipes of the shell side; the exhaust device of the power system of the pump truck, and the liquid nitrogen storage device Connect to one of the shell-side inlet pipe and the tube-side inlet pipe respectively. The utility model uses the waste heat generated by the power system of the liquid nitrogen pump truck as the gasification heat energy, which reduces the volume of the system structure and is novel and practical; the utility model reduces costs and saves energy due to the use of waste heat recovery and reuse technology, and achieves energy saving and emission reduction the goal of.

Description

Liquid nitrogen pump truck waste heat recovery heat exchange system

technical field

The utility model relates to the field of equipment systems for liquid nitrogen pump trucks in oilfield construction, in particular to a waste heat recovery heat exchange system for liquid nitrogen pump trucks.

Background technique

The existing liquid nitrogen gas supply system uses storage tanks to store low-temperature liquid nitrogen, heats and continuously vaporizes low-temperature liquid nitrogen through a vaporizer or fuel combustion, and continuously outputs nitrogen with a certain pressure. The cost of the existing liquid nitrogen gasification system is very high, the gasifier system equipment is huge, and the fixed structure cannot be moved. The flue gas emission of the fuel combustion heating gasification system is relatively serious for environmental pollution, and open flame heating is easy to cause danger and potential safety hazards Defects.

Utility model content

In view of the above-mentioned technical defects, the utility model provides a waste heat recovery heat exchange system of a liquid nitrogen pump truck which is simple in structure, safe and reliable, and can realize energy saving and emission reduction.

The technical solution of the utility model is: including the exhaust device of the power system of the pump truck, the liquid nitrogen storage device, and the waste heat reuse heat exchanger. The waste heat reuse heat exchanger includes a shell and pipe boxes connected at both ends. ; The housing is respectively provided with shell-side inlet and outlet pipes, and multiple sets of heat exchange tubes are installed inside the housing through the tube sheets on both sides, and the heat exchange tubes are connected with the tube-side inlet and outlet pipes on the tube box respectively. connection; the casing is provided with a plurality of baffles at intervals through a plurality of transverse pull rods to form a circuitous fluid channel, and the two ends of the fluid channel are respectively connected with the inlet and outlet pipes of the shell side; the exhaust of the power system of the pump truck The device and the liquid nitrogen storage device are respectively connected to one of the shell-side inlet pipe and the tube-side inlet pipe.

The above scheme is further preferably:

The tube box is an elliptical head, and is sealed and connected to the tube sheet through flanges and polytetrafluoroethylene gaskets.

An anti-shock protective baffle is provided inside the shell corresponding to the inlet pipe of the shell side, which protects the heat exchange pipe at the inlet.

The heat exchange tubes are arranged in an equilateral triangle, and the four-tube circulation mode is adopted, the arrangement is relatively compact and the heat exchange effect is good.

Compared with the prior art, the utility model has the following advantages:

(1) The waste heat generated by the power system of the liquid nitrogen pump truck is used as the gasification heat energy, which reduces the volume of the system structure, and the structure is novel and practical;

(2) The equipment has strong adaptability, can meet the requirements of load adjustment, and is safe and reliable;

(3) Due to the use of waste heat recovery and reuse technology, the cost is reduced, the energy is saved, the purpose of energy saving and emission reduction is achieved, and it is basically harmless to the environment.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the left view of Fig. 1;

In the figure: 1. Front pipe box, 2. Tube plate, 3. Shell, 4. Baffle plate, 5. Tie rod, 6. Heat exchange tube, 7. Rear pipe box, 8. Shell side inlet pipe, 9. Shell side outlet pipe, 10, tube side outlet pipe, 11, tube side inlet pipe, 12, anti-shock protection baffle.

Detailed ways

See Figure 1, a shoulder pole beam of a liquid nitrogen pump truck, including the exhaust device of the power system of the pump truck (such as the exhaust device of a diesel engine), a liquid nitrogen storage device, and a heat exchanger for waste heat recovery. The heat exchanger for waste heat recovery includes a shell The body 3 and the front and rear tube boxes 1 and 7 respectively connected at both ends, the tube boxes are all elliptical heads, and are respectively sealed and connected with the tube sheet 2 through flanges and polytetrafluoroethylene gaskets; Shell-side inlet and outlet pipes 8, 9 are provided, and the inside of the shell 3 is provided with an anti-shock protection baffle 12 corresponding to the shell-side inlet pipe 8 (installed on the uppermost heat exchange tube and fixed by welding with the tie rod) , which plays a protective role for the heat exchange tubes at the entrance; multiple sets of heat exchange tubes 6 are installed inside the shell 3 through the tube sheets 2 on both sides, and the heat exchange tubes 6 are arranged in an equilateral triangle, centered, and four tubes The heat exchange tube 6 and the tube plate 2 adopt a welded structure, and the heat exchange tube 6 is respectively connected with the tube side inlet and outlet tubes 10 and 11 on the front tube box 1; A plurality of baffles 4 are arranged at intervals on the transverse rods 5 to form circuitous fluid passages (the baffles force the fluid to pass through the tube bundle multiple times according to the prescribed distance, enhancing the degree of fluid turbulence), and the two ends of the fluid passages are connected to the shell side respectively. , the outlet pipes 8 and 9 are connected; the pump truck power system exhaust device and the liquid nitrogen storage device are respectively connected to the shell-side inlet pipe 9 and the tube-side inlet pipe 11 respectively.

When working, connect the exhaust device of the power system of the pump truck and the liquid nitrogen storage device to the shell side inlet pipe 9 and the tube side inlet pipe 11 respectively (you can choose the tube side or the shell side for cold and hot media according to actual needs), cold and hot The fluid flows inside and outside the heat exchange tube, and exchanges heat through the tube wall of the heat exchange tube to achieve the purpose of vaporizing the liquid nitrogen. The heat exchanger uses the wall of the tube bundle enclosed in the shell as the heat transfer surface. The structure of the partition wall heat exchanger is simple, the operation is convenient, it can be used under high temperature and high pressure, and it has strong adaptability to working conditions.

Claims (4)

1. A waste heat recovery heat exchange system for a liquid nitrogen pump truck, comprising a pump truck power system exhaust device and a liquid nitrogen storage device, characterized in that it also includes a waste heat reuse heat exchanger, and the waste heat reuse heat exchanger includes The shell and the tube boxes connected at both ends; the shell is respectively provided with shell-side inlet and outlet pipes, and multiple sets of heat exchange tubes are installed inside the shell through the tube sheets on both sides, and the heat exchange tubes are respectively connected to the The tube side inlet and outlet tubes on the tube box are connected; multiple baffles are arranged at intervals in the shell to form circuitous fluid channels, and the two ends of the fluid channels are respectively connected to the shell side inlet and outlet tubes. Connected; the exhaust device of the power system of the pump truck and the liquid nitrogen storage device are respectively connected to one of the inlet pipe of the shell side and the inlet pipe of the tube side. 2. The waste heat recovery heat exchange system of liquid nitrogen pump truck according to claim 1, characterized in that: the pipe box is an elliptical head, and is sealed and connected to the pipe plate through flanges and polytetrafluoroethylene gaskets respectively . 3. The waste heat recovery heat exchange system of liquid nitrogen pump truck according to claim 1, characterized in that: an anti-shock protection baffle is arranged inside the shell corresponding to the inlet pipe of the shell side. 4. The waste heat recovery heat exchange system of a liquid nitrogen pump truck according to claim 1, characterized in that: the heat exchange tubes are arranged in an equilateral triangle, and the circulation mode of four tubes is adopted.