PROBLEM TO BE SOLVED: To stably perform temperature control in which temperature of a posterior combustion furnace is maintained at target temperature maintaining temperature of a furnace body at target fixed temperature.SOLUTION: In a control device 100, model preestimate operation is performed making the furnace body, each temperature of the posterior combustion furnace, and component amount of exhaust gas as different target values respectively, under restricted conditions in which air volume of flowage air supplied to the lower part of the furnace body 10 and air volume supplied to an center part or the lower part and the upper part or the center part of the posterior combustion furnace 30 are made control input; flow rate of fuel, air volume of flowage air, and air volume of supplied air are made control output, at least one out of flow rate of fuel, air volume of flowage air, and air volume of supplied air is kept within the prescribed range.

Device and method of controlling temperature of circulation type fluidized incinerator

PROBLEM TO BE SOLVED: To protect the spray nozzle main body of a spray nozzle device fitted to a refuse disposal equipment from corrosion and dust SOLUTION: The spray nozzle main body 15 is formed by a spray pipe 17 and a nozzle tip 18 fixed to the tip of the spray pipe 17, and the main body 15 is set in a protective tube 16 A purge gas feed line 27 for heating the waste gas discharged on the downstream side of a bag filter and supplying the heated gas into the protective tube 16 is furnished, and the main body 15 is purged with the waste gas supplied to the protective tube 16

Spray nozzle device in refuse disposal equipment

PROBLEM TO BE SOLVED: To provide a heat recovery system from exhaust gas of an incinerator, in particular, from exhaust gas of sewage sludge incinerator, in which heat energy retained in the exhaust gas is effectively collected by a waste heat boiler, maintenance of the waste heat boiler is easy, and sludge incineration can be performed even during a legal inspection of the waste heat boiler.SOLUTION: In an exhaust gas treatment line of the incinerator 1 of sewage sludge, a white smoke prevention unit 6 for recovering heat, a dust collector 4 separating dust contained in the exhaust gas, and a flue-gas treatment tower 5 are installed in sequence. On a route guiding white smoke prevention air heated by the white smoke prevention unit 6 to a chimney 7, a heat recovery boiler 10 from the white smoke prevention air is installed to generate steam. Preferably, a bypass line 11 is formed in parallel with the heat recovery boiler 10 to allow the legal inspection of the heat recovery boiler 10 while continuing the incineration.

Heat recovery system from exhaust gas of incinerator

PROBLEM TO BE SOLVED: To provide an incineration plant capable of effectively utilizing heat of exhaust gas, and a waste heat recovery methodSOLUTION: An incineration plant A includes a dust collection device 1 performing dust removal processing to exhaust gas G generated in an incinerator, an exhaust gas cleaning device 2 cleaning the exhaust gas G processed in the dust collection device 1, and a humidity reduction device performing humidity reduction processing to the exhaust gas G processed in the exhaust gas cleaning device 2 As the humidity reduction device, an electrothermal conversion device 10 generating temperature difference from voltage is included With a low heat source cooled by supplying electric power to the electrothermal conversion device 10, the exhaust gas G processed in the exhaust gas cleaning device 2 is subjected to humidity reduction processing, and with heat of a high heat source heated by supplying electric power to the electrothermal conversion device 10, the exhaust gas G subjected to humidity reduction processing is heated to perform white smoke prevention processingSELECTED DRAWING: Figure 2

Incineration plant and waste heat recovery method

PROBLEM TO BE SOLVED: To provide a sludge incineration disposal system that can reduce an emission rate of nitrogen monoxide and also suppress an emission rate of carbon dioxide that is caused by burning of fossil fuels.SOLUTION: The sludge incineration disposal system for incinerating organic sludge includes: a sludge incinerator 3 for subjecting the sludge to self-burning disposal; a sludge loading mechanism 2 for loading the sludge into the sludge incinerator; a monitoring mechanism 12 for monitoring a burning state of the sludge inside the sludge incinerator 3; and a burn control device 11 for controlling the burning state based on the burning state of the sludge monitored by the monitoring mechanism 12 so that the self-burning is operated at least more than 850°C.

Sludge incineration disposal system and sludge incineration disposal method

PROBLEM TO BE SOLVED: To provide a waste heat power generation method by exhaust gas of an incinerator capable of effectively utilizing contained heat of smoke washing wastewater of a flue gas cleaning tower and recovering energy as electric power. SOLUTION: The exhaust gas of the incinerator 1 for incinerating sewer sludge is treated with an exhaust gas treatment in order through a white smoke preventing air preheater 3, a dust collecting device 4, and the flue gas cleaning tower 5, and the smoke washing wastewater discharged from the flue gas cleaning tower 5 is supplied to a waste heat power generation system 20 to perform waste heat power generation. By supplying the smoke washing wastewater raised in temperatures by contained heat of white smoke preventing air which is about 300°C to the waste heat power generation system 20, the power generation amount can be improved by about 60%. COPYRIGHT: (C)2010,JPO&INPIT

Waste heat power generation method by exhaust gas of incinerator

PROBLEM TO BE SOLVED: To provide sludge incineration equipment and a sludge incineration method using it capable of substantially reducing an amount of N 2 O generated during sludge incineration while maintaining an amount used of auxiliary fuel at the same level as that of a conventional incineration method. SOLUTION: Air for fluidizing with an air ratio of smaller than 1.0 is supplied together with fuel, sludge is put in a circulation fluidized bed furnace 1 wherein bed material is circulated and fluidized and it is pyrolyzed at a temperature zone of 550-750°C, and the bed material is separated by a bed material separating means 2 and sent to the circulation fluidized bed furnace. Pyrolyzing gas having passed through the bed material separating means 2 is guided to a posterior combustion furnace 5 of a subsequent stage, and by supplying only secondary combustion air with an air ratio of 0.1-0.4 in a local high temperature place forming zone 6 in an inlet side, a local high temperature place is formed to pyrolyze N 2 O. Air is blown into a complete combustion zone 7 of an outlet side to carry out complete combustion of unburned combustibles. COPYRIGHT: (C)2009,JPO&INPIT

Sludge incineration equipment and sludge incineration method using it

PURPOSE:To provide a waste combustion gas-treating device enabling to enhance thermal efficiency without requiring a heating furnace even in the case a denitrification equipment to remove NOx, etc., is installed and a treating method therefor. CONSTITUTION:This device is a waste combustion gas-treating device for treating waste combustion gas discharged from an incinerator 1, etc., and it is constituted of a spray tower 4 for removing an acidic component in the waste combustion gas by spraying a neutralizer, a ceramic filter 5 for collecting incinerated ash and reactional products in the waste combustion gas passed through the spray tower 4, and a reaction tower 6 for spraying ammonia into the waste combustion gas passed through the ceramic filter 5 and denitrifying with a catalyst.

Device for treating waste combustion gas and treating method therefor

PROBLEM TO BE SOLVED: To prevent clogging of a filter medium used in solid-liquid separation performed after cleaning of insoluble components after extracting phosphorus in incinerated ash into an alkaline solution.SOLUTION: The method for recovering phosphorus mixes the alkaline solution with incinerated ash containing phosphorus to extract phosphorus into the liquid and generate a phosphorus extract, after which the phosphorus extract is separated from insoluble components. After cleaning the insoluble components using a cleaning liquid, the cleaning liquid and insoluble components are separated by means of membrane filtration. When precipitating calcium phosphate by adding a calcium component to the phosphorus extract, the amount of calcium component added is caused to be greater than a multiple of zero, and at least 1 time and less than 1.3 times the reaction equivalent amount of phosphoric acid in the phosphorus extract.

Method for recovering phosphorus from incinerated ash

PROBLEM TO BE SOLVED: To prevent clogging of a filter medium used in solid-liquid separation into a phosphorus-containing solution and treated ash after extraction of phosphorus in incineration ash into an alkaline reaction solution.SOLUTION: A method of extracting phosphorus from incineration ash comprises measuring the dependence of the concentration of ionic silica eluted in an alkaline reaction solution of incineration ash upon the liquid/solid ratio, adjusting the liquid/solid ratio for incineration ash in the alkaline reaction solution to a specified liquid/solid ratio LSin which the tendency of the dependence of the elution concentration of ionic silica upon the liquid/solid ratio changes and extracting phosphorus from incineration ash by using the alkaline reaction solution, carrying out solid-liquid separation into liquid ingredients and solid ingredients by using a filter medium while suppressing clogging. Preferably, the dependence of the concentration of phosphorus eluted in the alkaline reaction solution upon the liquid/solid ratio for incineration ash is measured, and the liquid/solid ratio for incineration ash in the alkaline reaction solution is adjusted to be equal to or higher than a liquid/solid ratio 1.0 ml/g lower than a specified liquid/solid ratio LSin which the tendency of the dependence of the elution concentration of phosphorus upon the liquid/solid ratio changes, more preferably to be lower than the specified liquid/solid ratio LSof P.

Koji Kimoto

Papers

Waste heat power generation method by exhaust gas of incinerator

Sludge incineration equipment and sludge incineration method using it

Device for treating waste combustion gas and treating method therefor

Method for recovering phosphorus from incinerated ash

Method of extracting phosphorus from incineration ash