Submersible heat-exchanger

FIELD: equipment for gas cooling and moisture condensing, particularly for atomic power plants.

SUBSTANCE: apparatus comprises shell and coiled tube arranged inside the shell. The shell includes three sections, wherein coiled tube is secured inside middle section. Middle section has oppositely located inlet and outlet pipes for medium circulating in tubes. Coiled tube is formed as straight horizontal tubes with adjacent ends connected through U-shaped branches arranged in removable end sections of the shell, wherein the branches are turned one relative another so that three-dimensional coiled tube mound around vertical axis in formed. The inlet and outlet pipes are arranged in end shell sections, wherein mounting planes thereof are parallel to longitudinal shell axis.

EFFECT: improved accessibility of check points and reduced time of heat-exchanger putting of operation.

3 cl, 3 dwg

 

The invention relates to nuclear power and is intended for use in the gas cleaning system at nuclear power plants, in particular in the construction of heat exchangers designed for gas cooling and condensation in it in the form of steam moisture.

As is known, during operation of nuclear power plants is the formation of vapor-gas mixtures containing radioactive gaseous fission products that emit into the atmosphere. But before its release into the atmosphere of the gas-vapor mixture is subjected to purification from radioactive gaseous fission products. Because the filters are sensitive to moisture and temperature, gas-vapor mixture must be cooled and its moisture must be condensing. For cooling the gas-vapor mixture, heat exchangers. As the gas-vapor mixture contains radioactive gaseous fission products, heat exchangers shall comply with the rules and regulations for the safe operation of nuclear power plants, in particular, be subject to periodic inspection during the operation.

A known design of the heat exchanger (p. DE No. 4018569, publ. 12.12.91 g)containing the bundle of heat exchange tubes, fixed ends in the tube plate, and adjacent to the tube boards input and output manifolds environment tubular space. The beam pipe done which are U-shaped, and both branches and the plot of bend each pipe are inclined to the horizontal plane, ensuring plum medium heat exchanging tubes. The tubes and tube sheet are located in the casing, and inlet and outlet manifolds environment tubular space with inlet and outlet nozzles are located in a semi-circular cover attached to the casing.

A known heat exchanger (p. US No. 5255737, publ. 20.07.93 g)containing casing, and a bundle of heat exchange tubes, fixed ends in the tube plate, fixed in the middle part of the casing. On the ends of the casing are semicircular cover inlet cooler in heat exchange tubes through the tube plate. On the longitudinal axis of the semi-circular caps are inlet and outlet pipes for pipe protection. Inlet cooling tube environment in the casing has inlet and outlet openings located diametrically on the cover.

Above the design of heat exchangers to compensate for linear expansion of the heat transfer tubes require special tools, which on the one hand complicate the design of the heat exchanger, and on the other hand reduce its reliability, since a is introduced into the heat exchanger is a tool that can be damaged and you want to control. In addition, the heat exchangers and tube boards intensity from the ode heat from the heat exchange tubes is reduced, because of the design. In such heat exchangers difficult to control the quality of welds in places docking heat exchanger with tube plates.

These disadvantages are partially missing in heat exchangers in which the tubes are made in the form of a coil. The coil is essentially a twisted spring, and therefore, the compensation of linear expansion of the heat transfer tubes is carried out by moving (convergence - removal) of turns of the coil relative to each other. In the heat exchange tubes in the form of a serpentine path of the refrigerant gas is much longer than the same path in heat exchangers and tube boards. Therefore, the heat dissipation of such heat exchangers is more intense.

A known heat exchanger (A.S. SU # 1223010, publ. 07.04.86 g)containing casing with placed coaxially inside a tubular coil space-spiral type, wound around the vertical axis.

A known heat exchanger (A.S. SU # 1372173, publ. 07.02.88 g)containing casing with placed coaxially inside a tubular coil space-spiral type, wound around the horizontal axis.

In both constructions of heat exchangers coils made in the form of a spiral, wound from a single tube, thus eliminating the control of the coil. However, such a spiral can be navitrolla of tubes of relatively small diameter. The above heat exchangers can be used for cooling the gas in a small volume and condensation, the contained moisture in the form of steam. Therefore, the known construction cannot be applied in the gas cleaning system at the plant.

The closest to the technical nature of the claimed invention is (A.S. RU # 1384905, publ. 15.05.88 g) heat exchanger submersible type, containing a shroud and placed inside a tubular coil, provided with inlet and outlet pipes, respectively, for the tube and pipe environment. A known heat exchanger is designed for condensing moisture from the steam. Steam is fed through the inlet pipe in the coil and the casing serves heated water. In known heat exchange apparatus of the coil is made of tubes of small diameter, and therefore it cannot be used in the gas cleaning system at nuclear power plants where you want to clear large volumes of gas, which require a large flow cross sections of the tubes of the coil. The coil of the coiled pipes for this case to make is simply impossible. There is a certain limit of the diameters of the pipes, from which you can naviti coil. In addition, such a coil would be of very large dimensions, which automatically would lead to unnecessary increase in the size of the heat exchanger or to increase their number, and hence the size of the space to accommodate them at the plant.

The basis of the invention was tasked to develop the design of a heat exchanger, which ensures its easy control.

The technical result from the use of the invention is to provide quick access to control without time-consuming removal heat exchanger of the business cycle.

The claimed technical result is achieved due to the fact that in the heat exchange apparatus of the submersible type, containing a shroud and placed inside a tubular coil, provided with inlet and outlet pipes, respectively, for the tube and pipe environment, according to the invention the casing is made of three detachable sections, the middle section of which is fixed a tubular coil and placed diametrically inlet and outlet pipes for pipe protection, the coil is made in the form of direct horizontal tubes, the adjacent ends of which are interconnected by means of U-shaped bends, located in the removable end sections of the casing, and the branches of taps are rotated one each other with the formation of the coil space-spiral type, wound around the vertical axis.

The technical result is also achieved due to the fact that the tubular coil with removable side sections of the housing has outer contours, repeating their internal the profile, and set in relation to the above removable sections with a gap.

The technical result is also achieved due to the fact that the inlet and outlet pipes to the outside environment are located in the removable sections of the casing, while the mounting plane of the nozzle parallel to the longitudinal axis of the shell.

Due to the fact that the coil is made in the form of direct horizontal tubes, the adjacent ends of which are interconnected by means of U-shaped bends, branches are deployed relative to each other, created the coil space-spiral type, wound around a vertical axis, elongated in the direction of its axis and has a narrow shape in the direction of his other two axes. Such design of the coil convenient placement and fixation of the middle section of the casing. Placing bends in removable sections of the casing provides for the removal of these sections easy access to the places of joining bends pipe to control their condition. Running a tubular coil with removable side sections of the casing with the outer lines, repeating their internal profile, allows to increase the surface of the cooling pipe of the environment and at the same time additionally to dissolve in space docking sites adjacent pipes with taps, which further contributes to the simplification of process control with whom ikovac. The location of the inlet and outlet pipes to the outside environment in a removable casing sections so that their mounting plane parallel to the longitudinal axis of the casing, contributes to the rapid separation of the removable sections of the casing, so as simplified disconnecting the pipes from the mains inlet and outlet tube environment.

These and other features and advantages of the invention are described below with reference to the accompanying drawings, where:

figure 1 - General view of the heat exchanger in partial section;

figure 2 - section A-A;

figure 3 is a perspective view of the coil heat exchanger with a remote shell.

Heat exchanger 1 (figure 1 and 2) submersible type contains the casing 2 and placed inside the tubular coil 3. The casing 2 is made of three detachable sections. In the middle section 4 of the casing is fixed a tubular coil 3 and are located diametrically inlet 5 and outlet 6 nozzles for pipe protection. The coil 3 is made in a straight horizontal pipe 7, the adjacent ends of which are interconnected by means of U-shaped bends 8 (figure 3). These bends 8 are removable sections 9 of the casing 2. By placing bends in removable sections of the casing provides a fast and convenient approach to control the joints of the U-shaped bends pipe by separating the removable section is th casing from its middle part. The branches 10 of the U-shaped bends 8 (3) deployed relative to each other with the formation of the coil space-spiral type, wound around a vertical axis 11. Therefore, the tubular coil is elongated in the direction of one axis only, and its width is determined by the distance between the ends of the branches of the U-shaped bends 8. The height of the coil is determined by the number of branches of the coil needed to obtain the required degree of cooling and condensation of moisture contained in the gas blown through the pipe coil. Such design of the coil convenient placement and fixation of the middle section of the casing, and the heat exchanger is of the form, convenient for transportation and installation on site installation.

Tubular coil 3 by removable sections 9 of the housing has outer contours 12, repeating their internal profile, and set in relation to the above removable sections 9 with a gap 13. This allows to increase the surface of the cooling pipe of the environment and at the same time to dissolve in space docking sites adjacent pipes with taps, which further contributes to the ease of access to control coupling of the branches of the U-shaped bends with the pipe. Due to the fact that the pipes are arranged horizontally, where they dock with the branches of the U-shaped bends is the circumference. This allows prostituees production of the weld (obtained by a simple bore), and to get a simple welding joint with the subsequent shape of the weld, which is easy to control.

The inlet 14 and outlet 15 of the nozzles to the outside environment are removable sections 9 of the casing 2. Mounting plane 16 of the inlet 14 and outlet 15 of nozzles parallel to the longitudinal axis 17 of the casing 2. This creates the conditions for rapid separation of the removable sections of the casing from its middle section, as simplified detaching joining pipes from the mains inlet and outlet tube environment. After removing the mounting bolts (not shown) removable section of the casing is moved along the longitudinal axis of the heat exchanger. Therefore, the disassembly line (not shown) for supplying or draining tube environment is not required. Considering the fact that the heat exchanger is equipment mounted on NPP, it also improves the convenience of control.

Caplioonly the submersible apparatus of the type containing a shroud and placed inside a tubular coil, provided with inlet and outlet pipes, respectively, for the tube and pipe environment, characterized in that the casing is made of three detachable sections, the middle section of which is fixed a tubular coil and placed located diametrically inlet and outlet pipes for pipe protection, this is m the coil is made in the form of direct horizontal pipes, the adjacent ends of which are interconnected by means of U-shaped bends, located in the removable end sections of the casing, and the branches branches are expanded relative to each other with the formation of the coil space-spiral type, wound around the vertical axis.

Caplioonly apparatus according to claim 1, characterized in that the tubular coil with removable side sections of the housing has outer contours, repeating their internal profile, and set in relation to the above removable sections with a gap.

Caplioonly apparatus according to claim 1, characterized in that the inlet and outlet pipes to the outside environment are located in the removable sections of the casing, while the mounting plane of the nozzle parallel to the longitudinal axis of the shell.



 

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