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5398269 Water quality control method and device for nuclear power plant, and nuclear power plant
XI
New Patents
5395585
5397481
METHOD FOR CONTROLLING ODOR
SUBMERGIBLE TORCH FOR TREATING WASTE SOLUTIONS AND METHOD THEREOF
Goldstein Joel Ambler, PA, UNITED STATES Assigned to Aquarium Pharmaceuticals Inc The present method for deodorizing ammonia odor in an ammonia-containing environment includes adding to the environment a non-toxic, aqueous, deodorizing acidified amine-based ammonia composition in an amount effective to deodorize the ammonia odor in the environment. In addition, a method for preparing the ammonia deodorizing compositions and the compositions produced thereby is disclosed.
5395603 AUTOMATIC CONTROL SYSTEM FOR A CHEMICAL PROCESS, ESPECIALLY A WET PROCESS PHOSPHORIC ACID PLANT Hilakos Stephen W Valrico, FL, STATES Assigned to IMC Fertilizer Inc
Mattus Alfred J STATES Assigned Systems Inc
Oak Ridge, TN, UNITED to Martin Marietta Energy
A submergible torch for removing nitrate and/or nitrite ions from a waste solution containing nitrate and/or nitrite ions comprises: a torch tip, a fuel delivery mechanism, a fuel flow control mechanism, a catalyst, and a combustion chamber. The submergible torch is ignited to form a flame within the combustion chamber of the submergible torch. The torch is submerged in a waste solution containing nitrate and/or nitrite ions in such a manner that the flame is in contact with the waste solution and the catalyst and is maintained submerged for a period of time sufficient to decompose the nitrate and/or nitrite ions present in the waste solution.
UNITED
Maximum throughput of a wet process phosphoric acid plant at a fixed recovery can be obtained by controlling the filter feed to give a desired specific gravity of the filtrate from the last washing of the gypsum cake. The filtrate from the last washing of the gypsum cake also is called the first pass filtrate. The specific gravity of this first pass filtrate provides an indication of the overall filter efficiency and the loss of water-soluble phosphoric acid to the gypsum waste stream. The specific gravity of the first pass filtrate is controlled by adjusting the rate at which product slurry from the attack tank is fed to the filter. This product slurry feed rate is affected by the mechanical performance of the filter and the filterability of the gypsum crystals, which, in turn, is affected by operating conditions in the attack tank. Therefore, the feed rates of phosphate rock, sulfuric acid, and water, are controlled to produce the desired attack tank operating conditions and to maintain attack tank level. Each of the primary processing steps, i.e., operation of the attack tank and operation of the filter, is controlled to maximize plant efficiency. By minimizing phosphoric acid loss and optimizing operation of the attack tank in accordance with the invention, plant efficiency is maximized.
5398269 WATER QUALITY CONTROL METHOD AND DEVICE FOR NUCLEAR POWER PLANT, AND NUCLEAR POWER PLANT Nagase Makoto; Asakura Naohito; Sawa Toshio; Uchida Renzo; Ohsumi Katsumi Assigned to Hitachi Ltd
Yamato; Shunsuke; Hitachi,
Uetake Takeda JAPAN
A water quality control method for a nuclear power plant comprising the steps of maintaining the iron concentration in the feed water below 0.05 ppb by increasing iron removing rate at a condensed water purifying loopshifting the pH of the reactor water below a pH of 6.8 determined at a room temperature by injecting carbon dioxide gas in the primary cooling system and further optionally reducing the dissolved oxygen concentration in the reactor water below 20 ppb by injecting hydrogen gas into the primary cooling system, whereby 6OCo ion concentration in the primary cooling system is maintained low for a long interval.
New Patents
5395585
5397481
METHOD FOR CONTROLLING ODOR
SUBMERGIBLE TORCH FOR TREATING WASTE SOLUTIONS AND METHOD THEREOF
Goldstein Joel Ambler, PA, UNITED STATES Assigned to Aquarium Pharmaceuticals Inc The present method for deodorizing ammonia odor in an ammonia-containing environment includes adding to the environment a non-toxic, aqueous, deodorizing acidified amine-based ammonia composition in an amount effective to deodorize the ammonia odor in the environment. In addition, a method for preparing the ammonia deodorizing compositions and the compositions produced thereby is disclosed.
5395603 AUTOMATIC CONTROL SYSTEM FOR A CHEMICAL PROCESS, ESPECIALLY A WET PROCESS PHOSPHORIC ACID PLANT Hilakos Stephen W Valrico, FL, STATES Assigned to IMC Fertilizer Inc
Mattus Alfred J STATES Assigned Systems Inc
Oak Ridge, TN, UNITED to Martin Marietta Energy
A submergible torch for removing nitrate and/or nitrite ions from a waste solution containing nitrate and/or nitrite ions comprises: a torch tip, a fuel delivery mechanism, a fuel flow control mechanism, a catalyst, and a combustion chamber. The submergible torch is ignited to form a flame within the combustion chamber of the submergible torch. The torch is submerged in a waste solution containing nitrate and/or nitrite ions in such a manner that the flame is in contact with the waste solution and the catalyst and is maintained submerged for a period of time sufficient to decompose the nitrate and/or nitrite ions present in the waste solution.
UNITED
Maximum throughput of a wet process phosphoric acid plant at a fixed recovery can be obtained by controlling the filter feed to give a desired specific gravity of the filtrate from the last washing of the gypsum cake. The filtrate from the last washing of the gypsum cake also is called the first pass filtrate. The specific gravity of this first pass filtrate provides an indication of the overall filter efficiency and the loss of water-soluble phosphoric acid to the gypsum waste stream. The specific gravity of the first pass filtrate is controlled by adjusting the rate at which product slurry from the attack tank is fed to the filter. This product slurry feed rate is affected by the mechanical performance of the filter and the filterability of the gypsum crystals, which, in turn, is affected by operating conditions in the attack tank. Therefore, the feed rates of phosphate rock, sulfuric acid, and water, are controlled to produce the desired attack tank operating conditions and to maintain attack tank level. Each of the primary processing steps, i.e., operation of the attack tank and operation of the filter, is controlled to maximize plant efficiency. By minimizing phosphoric acid loss and optimizing operation of the attack tank in accordance with the invention, plant efficiency is maximized.
5398269 WATER QUALITY CONTROL METHOD AND DEVICE FOR NUCLEAR POWER PLANT, AND NUCLEAR POWER PLANT Nagase Makoto; Asakura Naohito; Sawa Toshio; Uchida Renzo; Ohsumi Katsumi Assigned to Hitachi Ltd
Yamato; Shunsuke; Hitachi,
Uetake Takeda JAPAN
A water quality control method for a nuclear power plant comprising the steps of maintaining the iron concentration in the feed water below 0.05 ppb by increasing iron removing rate at a condensed water purifying loopshifting the pH of the reactor water below a pH of 6.8 determined at a room temperature by injecting carbon dioxide gas in the primary cooling system and further optionally reducing the dissolved oxygen concentration in the reactor water below 20 ppb by injecting hydrogen gas into the primary cooling system, whereby 6OCo ion concentration in the primary cooling system is maintained low for a long interval.