CN2144807Y

CN2144807Y - Strengthening heat-transfer tube

Info

Publication number: CN2144807Y
Application number: CN 92242209
Authority: CN
Inventors: 张松龙; 徐宏兵; 应旦阳; 方邦铻; 曾清泉; 刘丰; 李雅琴; 李金科
Original assignee: CHEMICAL MACHINERY INST MINISTRY OF CHEMICAL INDUSTRY; China Petrochemical Corp
Current assignee: CHEMICAL MACHINERY INST MINISTRY OF CHEMICAL INDUSTRY; China Petrochemical Corp
Priority date: 1992-11-21
Filing date: 1992-11-21
Publication date: 1993-10-27
Anticipated expiration: 2002-11-21

Abstract

The utility model relates to a strengthening heat-transfer tube used for the ethylene cracking and reaming furnace, the new concept process converter of ammonia synthesis (LCA) and tube heater, comprising a single leaf vane and a tube body. The utility model is characterized in that the single leaf vane is inserted in the tube body; the external surface of the tube body is processed into the longitudinal straight rib. Adopting the technique, the utility model can visibly enhance the heat-exchanging ability under the condition that the size of the furnace body and the heat supply situation remain the same; or the utility model shortens the length of the furnace tube under the condition that the productivity remains the same.

Description

Strengthening heat-transfer tube

The utility model belongs to the intensify heat transfer pipe in ethane cracking furnace, synthetic ammonia new ideas flow process (LCA) converter and the tubular heater.

Heat pipe is a light pipe in the conventional tubular stove, even employing is two-sided radiotechnology, because caliber is bigger, heat-transfer effect is still undesirable.Intensify heat transfer pipes such as external existing at present interior plum blossom pipe, interior plum blossom helix tube and three leaves rotation plug-in unit, these intensify heat transfer pipes all are the reinforcements of putting forth effort on convection heat transfer' heat-transfer by convection in the pipe, manage the outer light pipe that still adopts.Interior plum blossom pipe and interior plum blossom helix tube are heat conduction reinforced limited, and under identical mass velocity and actual internal area situation, the heat transfer property of this pipe only increases by 20% than light pipe; Though three leaves rotations plug-in unit has increased by 33% by the heat flow of furnace wall, pressure drop has increased by 0.075 crust, complex structure not only, and also resistance drop is excessive.

The purpose of this utility model is for solving a single leaf rotation plug-in unit to be arranged in a kind of body that above-mentioned deficiency provides, and outer surface of tube body be the vertical intensify heat transfer pipe of rib directly, and this pipe can improve the augmentation of heat transfer effect.

The utility model is made up of single leaf revolving fragment and body, and characteristics are that single leaf revolving fragment is to insert in the body, and the outer surface of body is processed into vertically straight rib.The pitch of single leaf revolving fragment is 5-10 a times of caliber; The rib number of the vertically straight rib of the outer surface of body is 10-20.

Accompanying drawing 1 is a structure chart of the present utility model, and Fig. 2 is the vertical view of Fig. 1.

1 is single leaf revolving fragment among the figure, the 3rd, body, single leaf revolving fragment 1 inserts in the body 3, but convection heat transfer' heat-transfer by convection in the enhanced tube, eliminate the shorting region of tube hub fluid, resistance drop is little, also can suitably adjust the pitch H of single leaf revolving fragment according to technological requirement, this pitch can not wait from five times of caliber to ten times calibers, and the Reynolds number scope of application is 5000-150000 in the pipe; 2 is the vertically straight ribs of body 3 outer surfaces among the figure, and the direction of straight rib 2 is consistent with the flue gas of vertical tubular furnace trend, very favourable enhanced tube external radiation, convection heat transfer' heat-transfer by convection.The rib number can be decided according to arts demand, and the rib number is 10-20, and it is particularly suitable for synthetic ammonia new ideas flow process (LCA) converter that outer surface of tube body is processed into the intensify heat transfer pipe of straight rib.Two kinds of augmentation of heat transfer means that the utility model adopts are promptly inserted single leaf revolving fragment and outer surface of tube body and are processed into vertically straight rib and can adopt separately in the body, also can unite employing.

The utility model has good augmentation of heat transfer effect, two kinds of reinforcement means are united when adopting, heat transfer coefficient improves 100-123% than light pipe, the respective flow resistance increases 80-128%, increase under few situation in flow resistance, heat flow by furnace wall can improve more than 30% of total heat supply, is better than the augmentation of heat transfer technology that adopts at present greatly.The utility model can significantly improve exchange capability of heat under the constant situation of body of heater size, heat supply situation, improve production capacity or under the constant situation of production capacity, shorten boiler tube length, dwindles the stove volume, reduces fuel consumption.

Claims

1, a kind of intensify heat transfer pipe is made up of single leaf revolving fragment 1 and body 3, it is characterized in that single leaf revolving fragment 1 is to insert in the body 3; The outer surface of body 3 is processed into vertically straight rib 2.

2, heat-transfer pipe according to claim 1, the pitch H that it is characterized in that single leaf revolving fragment 1 are 5-10 times of caliber; The rib number of the vertically straight rib 2 of the outer surface of body 3 is 10-20.