CN1657860B - Vertical tube heat transfer equipment with fluidized on-line cleaning function outside the tube - Google Patents

Abstract

The invention discloses a triple phase fluidization online clean technique for the outside dirt of the tubes of vertical heat transmitting device. Install an ageing resistant easy bending soft plasticcloth tube at the bottom of the shell while there are uniformly arranged gas ejecting hole on the cloth tube. The cleaning gas ejected with hasting the liquor in the shell uprising driving the solidparticles strenuously move. With the auto circulating triple phase cleaning liquor, for releazing online, fast and uniform cleaning.

Description

Vertical tube heat transfer equipment with fluidized on-line cleaning function outside the tube

technical field

The patent of the present invention relates to a vertical heat transfer equipment with fluidized on-line cleaning function outside the tube. This technology can be widely used in periodic on-line cleaning of dirt outside the tubes of various tube heat transfer equipment.

Background technique

The vertical shell-and-tube heat transfer equipment currently in use cannot be mechanically cleaned after the shell-side liquid fouls outside the tube during operation. Almost only chemical cleaning methods can be used, but due to structural reasons, the cleaning uniformity is poor, the effect is not good, and it is easy to cause local corrosion. Therefore, the dirt outside the pipe cannot be removed in time, and the operating efficiency gradually decreases, deteriorates, and even partially blocked, leading to early failure and scrapping of the equipment, which seriously affects its service life.

Contents of the invention

The patent of the present invention aims to solve the problem of online rapid cleaning of the dirt outside the tube of the vertical tube heat transfer equipment, and proposes a vertical tube heat transfer equipment with the function of online cleaning of the fluidized outside the tube. The feature of the patent of this invention is that the vertical tube heat transfer equipment can be cleaned by three-phase circulating fluidization to realize periodic, on-line, fast and uniform removal of dirt outside the tube, to achieve the purpose of maintaining long-term efficient operation, and to maintain the basic structure The equipment cost under the same load hardly increases, and the cleaning cost is very low.

The technical scheme of the patent of the present invention is:

The vertical column tube ripening equipment with the function of external fluidized online cleaning is composed of heat transfer tubes, shells, positioning parts between tubes, air distribution pipes A, air distribution pipes B, air distribution hoses, cleaning particles, exhaust pipes, shells Process liquid inlet and outlet, upper tube sheet, lower tube sheet, blowdown valve, etc. A number of air distribution hoses are assembled near the lower tube plate, and one air distribution hose is arranged every 3 to 5 rows of heat transfer tubes. The air distribution hoses connected with the air distribution pipe A and the air distribution pipe B are arranged alternately. The air distribution hose is made of soft plastic that is resistant to aging and easy to bend and deform. There are air holes on the air distribution hose. The gas distribution pipe can be arranged inside the casing or outside the casing. The traditional baffle is replaced by the spacer between the tubes, the exhaust pipe is designed on the shell near the upper tube plate, and the drain valve is connected in parallel with the liquid inlet of the shell side. The shell is filled with solid particles for fluidized cleaning.

When it is necessary to clean the dirt outside the pipe during production and operation, open the air distribution pipe A, exhaust pipe and sewage valve, and close the shell side outlet valve. The area adjacent to the soft plastic air distribution hose connected with the air distribution pipe A is Driven by the cleaning gas, the shell-side liquid rises rapidly with a large number of bubbles, driving the cleaning particles to form a three-phase fluidized cleaning liquid. After the cleaning liquid moves to the liquid surface, the cleaning gas is separated from the shell-side liquid and the cleaning particles, and is exhausted. The shell side liquid and cleaning particles descend through the adjacent area of the gas distribution hose connected to the gas distribution pipe B to realize the up and down circulation flow in the shell side. Clean the dirt on the outer surface. After the dirt on the heat transfer tubes in this area is basically cleaned, close the gas distribution pipe A, open the other gas distribution pipe B, and change the circulation direction of the three-phase fluidized cleaning liquid. As a result of such alternate cleaning, both It solves the problem that the dirt cleaning uniformity and cleanliness of the one-way circulation flow are not good enough, and reduces the amount of cleaning gas that needs to be supplied per unit time by half, reducing the equipment capacity requirements of the cleaning gas source. Due to the three-phase fluidized cleaning liquid The flow state is very violent, the dirt cleaning speed is fast, the time is short, and the uniformity is good. The heat exchange efficiency during the cleaning process will not decrease, but will be strengthened. The structure of the spacer between the tubes can be a baffle rod, or It can be a sleeve, a cylindrical spring, or other structural members of other shapes with low axial flow resistance. Replacing the traditional baffle with the spacer between the tubes not only creates conditions for the upward and downward axial circulation of the cleaning fluid, but also enables Avoid vibration of the heat transfer tube during cleaning. Therefore, this kind of heat transfer equipment can be cleaned online to ensure long-term efficient operation of the equipment. The static pressure of the shell side liquid that needs to be overcome by the cleaning gas is not large, and only a low-pressure gas source is required. The gas source can be the existing low-pressure gas source on site, or a mobile small Roots blower can be independently configured for gas supply.

Description of drawings

Fig. 1 is a technical principle diagram of the vertical tube heat transfer equipment with the function of external fluidized online cleaning of the present invention.

Fig. 2 is a schematic diagram of an enlarged circumferential circulation three-phase fluidized on-line cleaning structure in the section A-A in Fig. 1 .

In the figure 1. Exhaust pipe 2. Shell 3. Heat transfer pipe 4. Positioning parts between pipes 5. Lower tube plate 6. Drain valve 7. Air distribution hose 8. Air distribution pipe A 9. Air distribution pipe B 10. Cleaning Particles 11. Shell side liquid outlet pipe 12. Upper tube sheet 13. Stomach

Detailed ways

Below in conjunction with accompanying drawing 1 and accompanying drawing 2 illustrate the specific embodiment of the patent of the present invention:

When it is necessary to clean the dirt outside the pipe during operation, open the gas distribution pipe A8, exhaust pipe 1, and blowdown valve 6 therein. The gas-liquid mixture in the vicinity of the gas-distributing hose 7 connected to the gas distribution pipe A8 flows upwards, and after its flow rate exceeds the settling velocity of the cleaning particles 10, it drives the cleaning particles 10 to flow upwards, forming a violently moving three-phase fluidized cleaning liquid. Quickly and effectively clean the dirt outside the heat transfer tube 3. After the cleaning liquid moves to the liquid surface, the separated cleaning gas is discharged through the exhaust pipe 1, and part of the sewage is discharged through the sewage valve 6. The blowdown valve 6 is connected in parallel with the shell side liquid inlet. The shell side liquid and cleaning particles 10 flow downward through the adjacent area of the air distribution hose communicated with the air distribution pipe B9 to implement internal circulation. After the dirt outside the heat transfer tube 3 in this area is basically cleaned, close the gas distribution pipe A8, open the gas distribution pipe B9, and change the circulation direction of the three-phase fluidized cleaning fluid to continue cleaning. Such alternate cleaning operations can not only improve the uniformity of cleaning, but also reduce the required amount of cleaning gas per unit time, and reduce the gas volume requirements of the cleaning gas supply equipment. The specific structure of the spacer 4 between the tubes may be a baffle rod, or a sleeve, a cylindrical spring, or other structural members of other shapes with low axial flow resistance. Replacing the traditional baffle with the spacer 4 between the tubes not only creates conditions for the up and down axial circulation of the cleaning liquid, but also prevents the heat transfer tubes from vibrating during cleaning. Due to the violent flow of the three-phase fluidized cleaning liquid, not only the cleaning speed is fast, uniform and economical, but also because the heat exchange efficiency during cleaning will not decrease, but will be strengthened, and online and periodic cleaning can be realized to achieve energy efficiency. The purpose of ensuring long-term efficient operation of equipment.

The air distribution hose 7 is arranged and fixed near the lower tube plate 5. Because the air distribution hose 7 made of soft plastic is very easy to bend and deform, it is convenient to assemble between the heat transfer tubes 3, and the traditional structure of the arrangement of the heat transfer tubes 3 can not be changed, and it is easy to manufacture. Compared with the traditional structure, it is almost No increase in manufacturing costs. The air distribution hoses 7 connected with the air distribution pipe A8 and the air distribution pipe B9 must be alternately arranged at intervals so that the three-phase fluidized cleaning liquid forms internal circulation flows in different directions during cleaning. The diameter of the pores 13 provided on the air distribution hose 7 is generally in the range of 4 mm to 8 mm. If it is too small, it will be easily blocked, and if it is too large, it will cause the cleaning particles 10 to pour back into the air distribution hose 7 . The gas injection velocity at the gas hole 13 is in the range of 10m/s-40m/s. The number of gas holes 13 is determined by the amount of cleaning gas and the gas injection velocity. The air holes 13 on the air distribution hose 7 are arranged substantially equidistantly and evenly. Air distribution hose 7 is made of aging-resistant engineering plastics. The gas volume required for cleaning is closely related to the settling velocity of the cleaning particles 10 and is approximately proportional. For example, when the settling velocity of the cleaning particles 10 is 0.25 m/s, the test shows that the required amount of cleaning gas calculated based on the area between the tubes is 55-75 cubic meters per square meter per hour.

The static pressure of the shell-side liquid that the cleaning gas needs to overcome is not large, and the supplied cleaning gas can use the existing low-pressure gas source on site, or independently configure the mobile small Roots blower for gas supply. Therefore, the cost of auxiliary equipment is very low.

The total area of the exhaust pipe 1 is determined by calculating the exhaust velocity and the total amount of cleaning gas. The exhaust velocity is based on the fact that the exhaust gas basically does not bring out the shell side liquid, generally in the range of 25m/s to 35m/s. If the shell side liquid is cooling water, a higher exhaust velocity can be adopted.

The cleaning particles 10 can be plastic particles, glass balls, porcelain balls, river sand, which are selected and determined according to the properties of the shell side liquid, the material of the heat transfer tube 3 and the difficulty of cleaning dirt.

Claims (6)

1. Vertical tube heat transfer equipment with fluidized on-line cleaning function outside the tube, mainly including shell (2), heat transfer tube (3), spacer between tubes (4), gas distribution pipe A (8), gas distribution pipe B(9), air distribution hose (7), cleaning particles (10), drain valve (6), exhaust pipe (1), shell side liquid outlet pipe (11), upper tube plate (12), lower tube The plate (5) and the sewage pipe (6) are characterized in that a plurality of air distribution hoses (7) are assembled near the lower tube plate (5), and air holes (13) are opened on the air distribution hose (7). Arrange an air distribution hose (7) between every 3 to 5 rows of heat transfer pipes (2), the air distribution hose (7) connected to the air distribution pipe A (8) and the air distribution pipe B (9) Both connected air distribution hoses (7) are alternately arranged. 2. The vertical tube heat transfer equipment with fluidized online cleaning function outside the tube according to claim 1, characterized in that the air distribution hose (7) is made of soft plastic that is resistant to aging and easy to bend and deform. 3. The three-phase fluidized on-line cleaning technology for dirt outside the tubes of vertical tube heat transfer equipment according to claim 1, characterized in that the spacers (4) between the tubes of the heat transfer tubes (3) are baffle rods, Or casing, or cylindrical spring. 4. The vertical tube heat transfer equipment with fluidized on-line cleaning function outside the tube according to claim 1, characterized in that the cleaning particles (11) are river sand, or porcelain balls, or glass balls, or plastic balls, or Plastic particles. 5. The vertical tube heat transfer equipment with fluidized on-line cleaning function outside the tube according to claim 1, characterized in that an exhaust pipe (1) is designed near the upper tube plate (12), and the exhaust pipe (1 ) has a root number of 1 to 6. 6. The vertical tube heat transfer equipment with fluidized on-line cleaning function outside the tube according to claim 1, characterized in that the gas distribution pipe A (8) and the gas distribution pipe B (9) are arranged in the shell (2), Or be arranged outside the casing (2).

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