RU41510U1 - INSTALLATION FOR PERIODIC PURGE OF A HORIZONTAL STEAM GENERATOR - Google Patents

Abstract

The invention relates to the field of energy and can be used in nuclear power plants in double-circuit nuclear power plants with a pressurized water-water power reactor and a steam generating unit with steam generators with a horizontal tube bundle. The installation contains mixing valves and individual inlets with manometers, a dummy on the steam generator body, a general washing device, connecting hoses, a solution dispensing device, beams with bubble nozzles, a tube bundle with inlet and outlet manifolds, a periodic purge fitting, a supply pipe for supplying working fluid and feed water , continuous blowdown fitting and steam manifold. The technical result consists in reducing the purge time, reducing the flow rate of the media used, improving the quality of mixing and the dosage accuracy of the media, lowering the pH of the washing solutions, providing the possibility of localizing the washing action in the areas of greatest pollution, accelerating and reducing the complexity of installation and dismantling of the installation, and ensuring external tightness.

Description

The invention relates to the field of energy and can be used in nuclear power plants in double-circuit nuclear power plants with a pressurized water-water power reactor and a steam generating unit with steam generators with a horizontal tube bundle.

The prior art method of chemical cleaning from deposits of surfaces of thermal power equipment [1], including determining the quantitative and qualitative composition of deposits, the time of complete cleaning for the selected detergent composition, feeding it to the ducts, holding and removing it with dissolved deposits and subsequent water washing with neutralization . Next, the final cleaning of deposits is carried out, which is carried out by the physical method when treating surfaces with an aqueous emulsion of a surfactant, which causes loosening and delamination of deposits mechanically due to the action of "wedging pressure"

without entering into chemical reactions with the metal. The disadvantage of this method is the limited efficiency of removing sludge deposits from the outer surface of the tube bundle and the inner surface of the steam generators.

Known nuclear steam generating unit [2] of the power unit of a nuclear power plant, which contains a water-water power reactor and several loop circuits, each of which has its own main circulation pump, a horizontal steam generator with a tube bundle, primary coolant circulation pipelines, working supply pipelines body-nutrient water, steam removal and removal of purge water of the second circuit. In the process of working in the steam generator, continuous blowing is performed with the removal of the working fluid and periodic blowing to remove sludge from the annulus of the steam generator. The disadvantage of periodic purging is the limited efficiency of removing sludge deposits from the outer surface of the tube bundle and the inner surface of the steam generators.

Closest to the proposed is a technical solution implemented in the method of operation of a steam generator with a horizontal tube bundle of a nuclear steam generating installation

power unit of a nuclear power plant [3], containing a water-water power reactor and several independent circulation loops, each of which contains a primary circulation pump of the primary circuit, “hot” and “cold” coolant pipes, a horizontal steam generator with a tube bundle attached to the input and output collectors of the coolant, the casing of which is equipped with a nozzle for supplying a working fluid-feed water, a steam collector, a nozzle (s) for continuous blowing and a nipple ( fittings) for periodic blowing, located in the lower part of the steam generator housing in the zone of the "hot" coolant inlet manifold. The disadvantage of periodic purging is the limited efficiency of removing sludge deposits from the outer surface of the tube bundle and the inner surface of the steam generators.

The objective of the invention is to increase the efficiency of periodic purging by accelerating it and more completely removing deposits of sludge from the outer surface of the tube bundle and the inner surface of the steam generator.

The problem is solved in that in the installation for periodic purging of a horizontal steam generator, comprising a housing

a steam generator with a regular hatchway located in the corresponding functional areas of the housing, a supply pipe for the working fluid-feed water, a continuous blowdown fitting, a steam manifold, a periodic blowdown fitting, the inlet and outlet manifolds to which the tube bundle is attached, and the corresponding pipelines are connected in series mixing armature with pressure gauge, individual eyeliner armature with pressure gauge and a dummy with inlet and outlet fittings mounted on a standard manhole, set oystvo total wash, the input of which is connected with the output fitting falyplyuka, solutions dispensing device, whose inputs are connected via connecting hoses to fittings falshlyuka other output, and the outputs are connected to respective beams, wherein the beams are provided with some bubble nozzles.

The technical result consists in reducing the purge time, reducing the flow rate of the media used, improving the quality of mixing and the dosage accuracy of the media, lowering the pH of the washing solutions, providing the possibility of localizing the washing action in the areas of greatest pollution, accelerating and reducing the complexity of installation and dismantling of the installation, and ensuring external tightness.

The structural diagram of the installation is presented in figure 1.

The installation for periodic purging of a horizontal steam generator contains a mixing valve 1 with a pressure gauge, 2 individual connection valves with a pressure gauge, a flylight 3 mounted on a standard hatchway of the steam generator housing 4, a general washing device 5, connecting hoses 6, a solution dispensing device 7 and 8 s beams bubble nozzles 11. Figure 1 also shows a tube bundle 9 attached to a “hot” inlet manifold 10 and a “cold” outlet manifold 13 with corresponding coolant pipelines, fitting 12 period purge, pipe 14 for supplying a working fluid-nutrient water, a fitting 15 for continuous purging and a steam manifold 16.

Installation works as follows. Periodic purging of the steam generator is performed in the shutdown mode of the power unit by supplying under high pressure through the valve 1 mixing chemical washing solutions, compressed air, clean condensate and steam, which then pass through the valve 2 individual eyeliner and falyylyuk 3 mounted on a standard hatch manhole case 4 steam generator, to the device 5 of the general washing, and through each of

connecting hoses 6 and a device 7 for dispensing solutions into two or more beams 8, lowered into the internal volume of the steam generator to different depths of the tube bundle 9 in places of a fixed local accumulation of sludge, for example, into the region of the “hot” inlet collector 10, and the rays lowered to the housing 4 are equipped with bubble nozzles 11, which protect the housing 4 from a high-pressure jet of washing solution. Regulation and control of the purge parameters is carried out by means of valves 1.2 and pressure gauges M. These media can be supplied either one after the other or together, the washing products are discharged through the periodic purge nozzle 12, which is structurally located mainly in the zone of the “hot” inlet manifold 10.

At the end of the periodic purge, the installation is dismantled, the standard manhole is closed and the power installation is switched to the operating mode: the coolant enters the tube bundle 9 from the “hot” inlet manifold 10 and is discharged by the “cold” outlet manifold 13 through the corresponding pipelines, the working medium is feed water enters through the pipe 14, continuous purging is carried out by means of the fitting 15, and the steam is removed through the steam manifold 16.

Thus, the installation provides external tightness and a dosed controlled supply of washing solution, steam, compressed air, clean condensate deep into the tube bundle of the steam generator in the zone of greatest pollution, intensive mixing of solutions, their local heating (which also allows to lower the pH of washing solutions), increases sharply contact surface of washing solutions with deposits; washing of the outer surface of the tube bundle and the inner surface of the steam generator improves T residues washout solutions, backwash and flush of undissolved sludge drainage, which generally improves the efficiency blowdown decreases its duration and expense of the media used.

The installation can be performed using structural, functional and modular elements known from the prior art, for example, matching in design with the analogues presented in the descriptions. So, for example, a steam generating installation can be performed not with one, as described in the present description, but with several independent circulating circuits, as described in the prototype. As fittings 1 and 2 can be used as typical, for example, DN 15,

DN 50, as well as automated devices controlled by computers, for example SM-2a with standard software. Connecting hoses 6 are used in a thermoacid resistant design. To fix the devices 7 for dispensing solutions, standard steam generator installation elements are used, for example, two hole sheets are opened above the local accumulation of sludge and their installation parts are used. To speed up the installation and dismantling of the installation as connectors for false hook fittings with hoses and dispensers with hoses and beams, quick disconnect connections, for example threaded "ball on cone" are used.

Sources of information

1. Patent 2166718 RU, F 28 G 9/00, 08 V 3/08, C 23 G 3/04. The method of chemical cleaning from deposits of surfaces of heat power equipment / V.A. Ryzhenkov, A.V. Kurshakov, V.E. Kulov, T.I. Petrova. (RF). Claim 07/04/2000; Publ. 10.05.2001.

2. Nigmatulin I.N., Nigmatulin B.I. Nuclear power plants. - M.: Energoatomizdat, 1986. S. 110-122.

3. Patent 2228488 RU, F 22 B 1/02, F 22 B 37/54. The method of operation of a steam generator with a horizontal tube bundle of a nuclear steam generating installation of the power unit of a nuclear power plant / I.O.Budko, V.I. Gorburov, Yu.F. Kutdyusov, N. B. Trunov, A. A. Khlebnikov (RF). Claim 11/21/2002; Publ. 05/10/2004.

Claims (1)

Installation for periodic purging of a horizontal steam generator, comprising a steam generator casing with a standard hatchway located in the corresponding functional areas of the casing, a supply pipe for the working fluid - feed water, a continuous purge nipple, a steam manifold, a periodic purge nipple, inlet and outlet manifolds to which a pipe is attached beam, and corresponding pipelines, characterized in that series-connected mixing valves with a pressure gauge, valves in an individual eyeliner with a pressure gauge and a hook with inlet and outlet fittings mounted on a standard hatchway, a general washing device, the input of which is connected to the outlet of the hook, the dispenser of solutions, the inputs of which are connected through the connecting hoses to the other outlets of the hook and the outputs are connected with corresponding beams, some beams being provided with bubble nozzles.