The heat exchanger
(57) Abstract:Usage: thermal engineering, in particular alumina production for heating and cooling slurries and solutions. The inventive heat exchanger consists of several heating and two mortar chambers 5 and 6 of the "tube-in-tube, coupled between a coaxially through the annular inserts, made in the form of pipe arrays. In tube sheets around the hole for the internal heat exchange tubes have additional aligned holes 12 for flow of fluid in the annular spaces of adjacent chambers, the holes 12 are located only in the contact part of the surfaces of the tube sheets, which prevents leakage of fluid from the annulus into the tubing of the chambers. 3 Il. The invention relates to heat engineering and can be used in alumina production for heating and cooling slurries and solutions.Known multi-element heat exchanger  consisting of a casing with four mortar cameras and two bundles of pipes installed in one another, i.e. "pipe in pipe". The camera is equipped with nozzles for inlet and outlet of the heated medium and coolant.Nedostaje"  a more simple design, consisting of two tubular elements, an inner tube which are connected in series between a so-called "rolls", and the outer pipe or tube part (space) elements are interconnected through the side of the fitting; internal pipes are joined with the ends from the outer pipe by means of annular inserts.The lack of heat exchanger is that the presence of these connecting elements ("rolls" and fittings), it cannot be made in the form of straight pipe during movement in one direction of the heated environment, such as inside pipes), and in the other direction of the heat carrier (for example, in the annular part), while technological conditions such movement, representing the transportation of liquids in opposite directions with their simultaneous exchange of heat is often necessary. This reduces the technological capabilities of the machine prototype.The objective of the invention increase the technological capabilities of the heat exchanger, while its simplicity.The technical result of the invention is the possibility of combining process heat transfer and transport of liquids by providing S="ptx2">The technical result is achieved in that the heat exchanger consists of several series-connected between the heating chambers of the "tube in tube" and two mortar camera type "pipe" pipe inlet and outlet of the heated medium and the coolant ring insert located on the ends of pipes of heating and mortar chambers are in the form of a tube sheets, with the possibility of joining together; the data grid is provided with an additional coaxial holes around the hole for the heat exchanger (inner) pipe, which serve to connect the annular spaces of the neighboring cells (neighboring cells can be either two heating or heating and mortar camera). In addition, additional holes are located in the part of the surfaces of the tube sheets in which they are in contact (joined) to each other.In Fig. 1 shows the proposed heat exchanger of Fig. 2 section a-a in Fig. 1; Fig. 3 connection of heat exchangers.The proposed heat exchanger consists of at least two buildings heating chambers (outer pipes 1 and 2, the stacked coaxially through tube sheets 3 and 4 and two mortar chambers 5 and 6, sostykovany is 4, 7 to 10 have openings: one for Central heat exchanger (inner pipe 11, which length may consist of several, for example, of the four (Fig. 1) separate pipes out in the tube sheets, and a few (Fig. 2 eight) holes 12 arranged around the Central hole, connecting the annulus heating and mortar cameras, for which the holes 12 made in the tube plates coaxially. Mortar camera 5 and 6 have the pipes 13 and 14 for the inlet and outlet of the heated medium and coolant. The pipe 11 passing through the casing of the heating chambers 1 and 2 and mortar camera 5 and 6, the ends on the outside of the pipes 15 and 16.The heat exchanger works as follows.Coolant, for example, circulating the solution in the production of alumina, which must be cooled, is fed into the apparatus through the pipe 13 into the mortar chamber 5, through aligned holes 12 in the tube sheets 7 and 8 the solution into the annulus of the casing of the heating chamber 1, and the solution cannot seep into the tubular part of the chamber and the outside, so as holes 12 made in the side surfaces of the tube sheets 7 and 8, by which they are in contact through the strip (in the latter is the target in the same way through the holes 12 in the tube sheets 3 and 4, enters the body of a heating chamber 2, and then into the mortar chamber 6, and finally leaves the apparatus through the pipe 14.Countercurrent heat carrier circulating solution moves the heated environment, for example, water pond liquor secondary alumina production, which is fed into the apparatus through pipe 16, which is a continuation of the inner tube 11, which then passes through the entire apparatus is heated while circulating warm solution, which, in turn, is cooled. Heated pond liquor secondary water exits from the apparatus through the pipe 15.The proposed design of the heat exchanger allows the heat exchange process two liquids while simultaneously transporting them to the destination, when the technological needs of production, they move in opposite directions; thus, the heat exchanger can be assembled in the complex (Fig. 2 shows the connection of the heat exchangers in the same way as connected heat exchange elements of the apparatus of the prototype ), i.e. if necessary, you can connect them not only in one line, but in several parallel rows, a counter-current movement of fluids is maintained. In addition, inside the heat exchanger can be installed one advantage of this design.Thus, the proposed heat exchanger has a large technological capabilities than the machine-prototype, while maintaining the simplicity of its construction.Literature:
1. Eremin N. And. and other Processes and apparatus for the production of alumina. M. metallurgy, 1980, S. 144, Fig. 43.2. Ibid, S. 143, Fig. 42. A heat exchanger containing serially interconnected heating and two mortar camera type "pipe in pipe", with ring inserts on the ends of pipes and fittings inlet and outlet of the heated medium and the coolant mortar chambers, characterized in that the annular insert cameras made in the form of tube sheets, the contacting part of the surface and with additional aligned holes, indicating annulus cells, these holes are located in the part of the surfaces of the tube sheets, which they are in contact.
FIELD: heat power engineering.
SUBSTANCE: according to proposed method, inner pipe is fitted into outer pipe after shape-treatment of at least outer surface of inner pipe or inner surface of outer pipe, and after fitting inner pipe outer pipe, inner pipe is expanded to bring outer surface of inner pipe in tight contact with inner surface of outer pipe, and shape-treatment of surface forms at least one channel to reveal leakage between two pipes. Before fitting in pipes at least outer surface of inner pipe or inner surface of outer pipe is coated with layer of solder, for instance, tin, and inner pipe is expanded so that outer pipe also expands, and solder layer between inner and outer pipes is melted. Outer pipe is expanded so that melted layer of solder is forced out from space between inner and outer pipe at least intone channel to reveal leakage. Such heat exchange pipe contains assembly unit consisting of outer pipe and inner pipe fitted at tight contact in between and at least one channel to reveal leakage passing in contact surface and near the surface between inner and outer pipes. Thin film-like layer of solar material, such as tin, is provided in place of contact between inner and outer pipes which, owing to melting, connects with inner pipe and outer pipe, inner and outer pipes adjoining with displacement. Invention makes it possible to increase heat transfer to value equal to or practically equal to that of solid heat exchange pipe and channel to reveal leakage remains free from filling medium, thus providing accurate and reliable revealing of leakage.
EFFECT: improved reliability.
15 cl, 6 dwg