Hitachi, Ltd.

Hitachi Machinery and Engineering, Ltd.

Takuya Sasaki

Katsumoto Otake

Sankichi Takahashi

Isao Okouchi

Yasuteru Mukai

Masahiko Miyai

Hiroshi Satoh

Yasuo Fujitani

Yoshio Sumiya

Mituo Suzuki

Keizo Ishida

Shigeo Oda

Tamotsu Yamane

Hideki Kon

Makoto Yanagihara

Toshihiko Kaneko

Tokunori Matsushima

Yoshun Horibe

An apparatus for collecting cleaning bodies in a tubular heat exchanger capable of collecting the cleaning bodies with a high collection efficiency against the temporary introduction of a large amount foreign matter such as falling tools in a cooling water system and against the deflected flow of the cooling water from the upstream side. A rectifying member rectifies or regulates the deflected flow of the cooling water from the upstream side whereby it is possible to collect the cleaning bodies without any adhesion and stagnation of the cleaning bodies in the cooling water on V-shaped collection lattices. It is also possible to trap a large article such as a falling tool between a guide member disposed downstream of the collection lattices and the collection lattices, and to introduce only the cleaning bodies into the guide member. Furthermore, the downstream port of a cleaning body discharge pipe opens toward the downstream side to thereby prevent the clogging of the port with the foreign matter or the like.

Apparatus for collecting cleaning bodies for tubular heat exchanger

A method and system for cleaning cooling tubes of a heat transfer unit including a steam chamber through which the cooling tubes extend and into which steam generated in a steam power generating plant is introduced so as to exchange heat with a cooling water flowing through the cooling tubes. Cleaning bodies are introduced into the cooling water and then distributed to the cooling tubes so as to clean the latter. The cooling tubes are divided into a plurality of groups, with each group including a plurality of the cooling tubes having the same trends of cleanliness. The cleaning bodies are respectively introduced to the groups in respective quantities suitable for cleaning the cooling tubes of each group in dependence upon the particular degree of cleanliness of the cooling tubes of the respective groups.

Method of and system for cleaning cooling tubes of heat transfer units

A sorting apparatus for sorting elastic balls for cleaning the inner surfaces of heat transfer tubes of a heat exchanger. The apparatus comprises a casing having a cylindrical cross-section, an inlet pipe connected to an upper portion of the wall of the casing and adapted to introduce the elastic balls together with the cooling water, a substantially frusto-conical separation sleeve disposed at the center of the casing and having a peripheral wall in which formed are a multiplicity of apertures shaped and sized to permit only the worn out elastic balls smaller than a predetermined size to pass therethrough, an annular swirling passage defined between the inner peripheral surface of the casing and the outer peripheral surface of the separation sleeve and adpated to impart a swirl to the cooling water suspending the elastic balls and introduced into the casing, an outlet pipe connected to a lower portion of the wall of the casing and adapted for taking out the valid elastic balls greater than the predetermined size, and a discharge pipe also connected to the casing and adapted for discharging the worn out elastic balls which have been introduced into the separation sleeve.

Sorting apparatus

In a cleaning system for heat conductive conduits of a heat exchanger, a great number of balls are circulated through the conduits for mechanically removing incrustations formed on the inner surfaces of the conduits. In order to automatically operate the cleaning system, there are provided with ball counters, one of which counts the number of balls actually circulating the system and the other count the number of balls to be withdrawn out of the system or replaced with new balls because of worn out or breakage. The number of balls circulating is always maintained at a certain level necessary for effective cleaning by a controller which actuates various valves to maintain the number of balls in response to the signal generated by the ball counters.

Cleaning system for heat conductive conduits of a heat exchanger

The feedwater heater of this invention comprises a plurality of heating tubes arranged in U form, with feedwater being passed therethrough, a feedwater inlet chamber having a feedwater inlet for introducing feedwater thereinto and a tube plate assembling the ends of said heating tubes and also having formed therein a feedwater reservoir, a feedwater outlet chamber having a feedwater outlet for discharging the heated feedwater and a tube plate assembling the other ends of said heating tubes and also having formed therein a feedwater reservoir, a first cylindrical body or shell having disposed therein a tube nest consisting of the U-formed heating tube portions positioned on one side as well as support plates holding said heating tubes in position, said cylindrical body having its one end communicated with said feedwater outlet chamber and also provided with a hot steam inlet for introducing hot steam that serves as the feedwater heating source, a second cylndrical body or shell having disposed therein a tube nest consisting of the U-formed heating tube portions positioned on the other side as well as support plates holding said heating tubes in position, said second cylindrical body having its one end communicated with said feedwater inlet chamber and provided with a condensate outlet for discharging the steam condensate out of the system, and a spherical container formed from two hemispherical shells communicated with said both cylindrical bodies and having therein a space housing the bent portions of said U-formed heating tubes.

Feedwater heater

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Hitachi, Japan

Takuya Sasaki