SU949451A1 - Plant for investigating heat and mass transfer in dynamic two-phase layer of dissosiating heat carrier - Google Patents

Description

The invention relates to heat transfer, namely to installations for studying heat and mass transfer in a dynamic two-phase layer.

A known apparatus for studying heat transfer in a coolant based on nitrogen tetroxide lj.

The disadvantage of this setup is the impossibility of studying heat and mass transfer in a dynamic two-phase layer.

Closest to the invention is a facility for studying heat and mass transfer in a dynamic two-phase layer, comprising a steam preparation tank, an experimental section, a pipeline connecting the steam preparation tank to an experimental L2J plot.

However, in a known installation, no condensate is returned to the steam generator, and the non-condensable gases are blown into the atmosphere.

When heated, the nitrogen stream dissociates according to the scheme

2NO Oh,

; ± 2NO,

N-, 0

l h tj 11 / "

With the passage of hot steam coolant based on N404 through the layer

cold liquid oxides are cooled rapidly and the composition of the equilibrium mixture remains frozen. Nitrogen oxide (NO) dissolves in the liquid phase much better than oxygen, and therefore the liquid phase turns out to be N0 enriched, and the gas phase is O ,.

The presence of excess nitric oxide changes its thermophysical and physicochemical properties, therefore, when conducting experimental work with CRRD, the constancy of the composition of the initial products are imposed.

When using the known installation scheme for studying heat and mass transfer in a dynamic two-phase layer N2.04. it is necessary to use a neutralizer on the blowing line of non-condensable Gases, since nitrogen oxides are toxic, and the circuit design does not allow the regeneration of liquid oxides directly in the installation itself,

The aim of the invention is to ensure the possibility of regeneration of the coolant directly in the installation.

Claims (1)

This goal is achieved by the fact that the installation comprising a steam preparation tank, an experimental section and a pipeline connecting the steam preparation container to the experimental section, additionally contains a syringe tank with a heater, which is connected by pipelines with valves installed on them one - to the top of the experimental section. and the other with the pipeline, the steam preparation capacity is connected to the experimental section, and the steam preparation capacity is equipped with a refrigerator. The drawing shows the principal scheme of the proposed installation. The installation contains a raw material tank 1 with a heater 2, a steam preparation tank 3 with a heater 4 and a cooler 5, an experimental section b, a steam line 7 with a shut-off valve B4, a liquid LI VIE 8 with a valve B1, a pipeline 9 connecting the steam preparation tank 3 with experimental section 6, and located on it, gate valves B2 and B1. The installation works as follows. Upon reaching the required parameters in the tank 3 for preparation of steam heat carrier, the specified flow rate is supplied to the experimental section 6 via line 9 via valves 82 and VZ, where it is cooled and condensed in the dynamic two-phase layer. Uncondensed vapor enriched with 0. and liquid N3.04. Enriched with N0 accumulates in experimental section 6. Capacity 3 of the preparation is cooled with the help of cooler 5 to a temperature below and in it, due to condensation of the remaining vapor, vacuum is created (boiling point at a pressure of 0.1 MPa is equal to). After that, through the valves 83 and B2, liquid oxides and heat carrier vapors from experimental area 6 enter it. The heat carrier vapor enriched with oxygen, left in the vapor space of the experimental section b, is felt by the steam of the pure heat carrier from raw material tank 1 through pipe 7 and 9 and valves B4, VZ and B2 in capacity 3 of steam preparation. After the end of the purge of the experimental section 6, the refrigerator 5 is turned off, all the valves shut off, and the heat transfer fluid in the steam preparation tank 3 is heated by the heater 4 until complete evaporation. In the vapor phase in the preparation steam tank 3, the recombination N0 and 0 exceeds the equilibrium composition 2NO + 0. j:; 22NO, 5jN ,, 0 The proposed installation provides for the regeneration of the spent coolant, and also permits the installation to be sealed, which guarantees the isolation of the environment from toxic nitrogen oxides. An apparatus for studying heat and mass transfer in a dynamic two-phase dissipated heat carrier layer containing a steam preparation tank, an experimental section and a pipeline, connecting a vapor preparation tank to an experimental section, characterized in that, in order to ensure regeneration of the coolant directly in the installation, it is additionally equipped a raw material tank with a heater, which is connected by pipelines with valves installed on them: one - with the upper part of the experiment portion ceiling elements, and the other - with a conduit connecting said tank with the experimental preparation vapor portion, wherein the container is provided with a pair of training refrigerator. Sources of information taken into account in examination 1, Petukhov T, D, and others. High pressure installation on dissociating nitrogen tetroxide N3.04. - In Sat, j Dissociation gases as coolants and working body of power plants, Minsk, publishing house of the Academy of Sciences of the BSSR, 1977, h, 3, s, 64-67, 2, Khoze A, B, Zakharov A, E. Volumetric heat transfer coefficient for condensation of water vapor in the on-flow dynamic two-phase layer, Academy of Sciences of the USSR, 1977, 2, no. 2, s, 30-33 (prototype),