CN210321391U

CN210321391U - Sealing structure for installing and leading wire in water chamber of heat exchange equipment

Info

Publication number: CN210321391U
Application number: CN201920838484.5U
Authority: CN
Inventors: 徐加鹏; 姜文鑫; 宋立滨; 姜宝双; 刁志忠; 周国清
Original assignee: Changchun No2 Co Generation Power Co ltd
Current assignee: Changchun No2 Co Generation Power Co ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2020-04-14
Anticipated expiration: 2029-06-05

Abstract

A sealing structure for mounting and leading wires in a water chamber of heat exchange equipment belongs to the technical field of special sealing improvement of a thermal power plant. The utility model aims at effectively carrying out the seal structure of the interior installation of indirect heating equipment water chamber and lead wire sealed to thermal power plant's steam turbine unit's condenser. The utility model discloses a transducer, transducer pass through branch pipe and the main box intercommunication of working a telephone switchboard, are full of hydrophilic epoxy in the main box of working a telephone switchboard, and the intercommunication has the nozzle stub on the main box of working a telephone switchboard, and the nozzle stub passes through the telescopic joint to be connected with the main pipe of lead wire, and the main pipe of lead wire is connected with external union coupling through casing transition sealing flange. The utility model discloses can solve large-scale unit condenser in service, guarantee inside and clear away the soft or hard dirt effect of tube sheet and heat exchange tube wall, guarantee the cleanliness of heat exchange tube to reinforcing heat exchange tube inner wall convection heat transfer ability.

Description

Sealing structure for installing and leading wire in water chamber of heat exchange equipment

Technical Field

The utility model belongs to the technical field of special sealing improvement of thermal power plant.

Background

The condenser is an important component of the steam turbine unit and has the function of cooling and condensing the exhaust steam of the steam turbine into water to form high vacuum, so that the steam entering the steam turbine can expand to be far lower than the atmospheric pressure to do more work.

The safety and the economical efficiency of the whole unit are directly influenced by the working performance of the condenser. Condenser vacuum is a main index for representing the operating characteristics of the condenser, and is one of main factors influencing the safe and economic operation of the steam turbine set.

Factors influencing the vacuum of the condenser are complex, and comprise the heat transfer characteristic of the condenser, the heat load of the condenser, the cleaning rate of a heat exchange pipe, the temperature of cooling water, the quantity of the cooling water, the characteristic of a cooling water system and the like.

For an already-put-into-operation steam extraction and condensing unit, the cooling area, the cooling water quantity, the heat load and the like of a condenser are basically fixed, and the characteristics, the cooling mode and the cooling water temperature of a cooling water system are also limited by factors such as the geographical position, the seasonal climate and the like of a power plant. Improving and maintaining higher heat exchange tube cleaning rate is the most effective way to keep the vacuum of the condenser high. Fouling and scaling of the water side of the heat exchange tubes of a condenser are the most common causes of deterioration of the vacuum of the condenser.

The ultrasonic descaling technology tends to be perfect after years of development, but is restricted by ultrasonic conduction attenuation, the ultrasonic descaling equipment arranged outside the heat exchanger shell has higher requirements on the size, the structure and the material of the heat exchanger, the effective ultrasonic conduction distance is generally not more than 1 meter, and the descaling effect of the part far away from the installation position of the ultrasonic transducer in the large heat exchanger is not ideal.

In order to solve the problem that the descaling effect of the part far away from the installation position of the ultrasonic descaling device in the condenser and the large-scale heat exchange device is poor, an ultrasonic descaling device transducer needs to be installed in the condenser and the large-scale heat exchange device nearby. According to market research earlier, in the transition process of leading wire inside and outside the hydroecium of applied heat transfer equipment, a mode adopts trompil on the casing, and the lead wire directly penetrates, seals with sealed glue such as resistant oil, water-fast at the changeover portion, though play sealed effect temporarily, but along with the change of the difference in temperature inside and outside the heat transfer equipment, the colloid is ageing, lead wire sheath corruption etc. the sealed effect worsens. The other method is to weld the inside and outside of the transition section of the heat exchange equipment through a steel sheath or a steel pipe, so that the problem of sealing failure is solved, but the rigid part has different expansion coefficients, so that the brittle deformation is easy to occur until the rigid part is broken, the equipment is damaged more greatly, or the root of a measuring point is separated from the surface of a body to be tested, and the measuring and using effects are distorted.

In summary, how to solve the problems of the lead wire and the installation in the water chamber of the transducer will be used as an important research topic component of the application of the ultrasonic descaling technology in the thermal power generation system. The invention discloses a novel sealing method for lead transition of heat exchange equipment through various applicability tests on the basis of reference to the existing descaling technology.

Disclosure of Invention

The utility model aims at effectively carrying out the seal structure of the interior installation of indirect heating equipment water chamber and lead wire sealed to thermal power plant's steam turbine unit's condenser.

The utility model discloses a transducer, transducer pass through branch pipe and the main box intercommunication of working a telephone switchboard, are full of hydrophilic epoxy in the main box of working a telephone switchboard, and the intercommunication has the nozzle stub on the main box of working a telephone switchboard, and the nozzle stub passes through the telescopic joint to be connected with the main pipe of lead wire, and the main pipe of lead wire is connected with external union coupling through casing transition sealing flange.

The utility model discloses can solve large-scale unit condenser in service, guarantee inside and clear away the soft or hard dirt effect of tube sheet and heat exchange tube wall, guarantee the cleanliness of heat exchange tube to reinforcing heat exchange tube inner wall convection heat transfer ability. Because the transducer water chamber is internally and externally combined and installed, the arrangement is reasonable, the vibration wave energy reaches the descaling surface nearby, the defect that the vibration wave energy is gradually attenuated when the transducer is installed only outside is avoided, the descaling effect is balanced and obvious, and the descaling energy efficiency is exerted to the maximum. The lead sealing technology fundamentally solves the problem of sealing failure caused by the modes of shell opening, lead direct-in, colloid sealing, sheath welding and the like.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The utility model discloses a transducer 7, transducer 7 pass through branch pipe 6 and the main box of working a telephone switchboard 5 intercommunication, and transducer 7 is the transposition of main ultrasonic wave descaling, but it needs the circuit to support, so, the utility model discloses it is mainly that the circuit of having protected transducer 7 is main. The main connection box 5 is filled with hydrophilic epoxy resin, the transducer 7 is basically coated by the hydrophilic epoxy resin when being arranged in the main connection box 5 and cannot be contacted with the inner wall of the main connection box 5, the main connection box 5 is communicated with a short pipe 4, the short pipe 4 is connected with a main lead pipe 3 through an expansion joint 9, and the main lead pipe 3 is connected with an external pipe 1 through a shell transition sealing flange 2.

The utility model discloses mainly constitute by ultrasonic wave scale removal equipment, lead wire seal assembly.

And the line of the transducer in the water chamber, which is connected to the pulse power supply, penetrates into the water chamber through the lead sealing assembly in a sealing mode, and the pulse power supply is connected to the transducer through the line.

The utility model discloses lead wire seal assembly includes lead wire main pipe, wiring main box, lead wire branch pipe, wiring branch box, branch pipe, lead wire main pipe seals the casing that passes the condenser, and the sealing between condenser is welding, flange joint, lead wire main pipe end sealing connection wiring main box in the condenser, a plurality of lead wire branch pipes of sealing connection on the terminal surface of wiring main box or the side, lead wire branch pipe end sealing connection wiring branch box, a plurality of branch pipes of terminal sealing connection of wiring branch box or side, branch pipe end sealing connection transducer; the main lead pipe, the branch lead pipe and the branch pipe are metal hard pipes; the diameter of the lead main pipe is phi 60mm, the diameter of the connecting branch pipe is phi 30 mm, and the diameter of the branch pipe is phi 10 mm.

The lead sealing component is used for leading a pulse power line into a condenser water chamber through a specially designed sealing device, connecting the pulse power line with the transducer and connecting the pulse power line into the transducer so as to enable the pulse power line to vibrate and work. According to the heat exchange area and the installation mode of the condenser, the condenser is designed into a multi-lead wiring main box type; the multi-lead wiring main box is used for leading power wires into the wiring box and connecting the power wires with the transducer through the branch pipes.

The lead sealing assembly of the multi-lead wiring main box type comprises a lead main pipe, a wiring main box, a branch pipe, a lead main pipe penetrates through a shell of a condenser in a sealing mode, the shell is welded with the condenser in a sealing mode, the lead main pipe is connected with the terminal sealing connection wiring main box, a plurality of (2-36 unequal) branch pipes are arranged on the end face or the side face of the wiring main box, one end of the branch pipe is connected onto the wiring main box through a sealing joint, the other end of the branch pipe is connected with an energy converter through the sealing joint, and the sealing wiring of a plurality of (2-36 unequal) energy converter pulse power supplies is completed. The main lead pipe and the branch pipe are metal hard pipes. The specification of the lead main pipe is phi 30 mm, and the length of the lead main pipe is from the outer side of the condenser to the inner side of the main wiring box. The specification of the branch pipe is phi 10 mm, and the length of the branch pipe is from the main junction box to the joint of the transducer. All have the characteristics of sealing, pressure bearing and corrosion resistance.

After the connection of the main wiring box on the sealed street of the transducer is finished, the main wiring box is filled with hydrophilic epoxy resin, and has the micro moisture absorption effect on the premise of ensuring a good sealing effect.

The lead main pipe and the branch pipe of the hard pipe are designed into a telescopic structure, so that the installation position of the transducer can be conveniently adjusted.

The main wiring box is a polygonal cylinder in shape and is made of metal materials. The external dimension is as follows: the diameter is 150mm and the height is 60 mm.

Claims

1. The utility model provides a sealing structure of installation and lead wire in indirect heating equipment hydroecium, includes transducer (7), its characterized in that: the energy converter (7) is communicated with the main wiring box (5) through the branch pipe (6), the main wiring box (5) is filled with hydrophilic epoxy resin, the main wiring box (5) is communicated with a short pipe (4), the short pipe (4) is connected with the main lead pipe (3) through an expansion joint (9), and the main lead pipe (3) is connected with the external pipe (1) through a shell transition sealing flange (2).