Mitsubishi Materials Corporation

Yoshinori Takayama

Junzhu Wang

Hirokazu Shima

Daisuke Sakaniwa

Takuya Komatsu

Eiichi Motohashi

Nobuyuki Soyama

Katsumi Ogi

Hideyuki Hirakoso

Naohiro Higuchi

Shingo Okamura

A fluidized calciner is provided which allows a reduction in the rate of unburned fuel at an outlet of a fluidized calciner to enable sufficient calcination while preventing possible occlusion in a preheater, even when pulverized coal of coal or coke, which has low combustion quality, is used as fuel, based on calculations in accordance with computational fluid dynamics based on the shape of an actual furnace and operational conditions. The present invention provides a fluidized calciner including a tubular furnace body () in which an axial direction is an up-down direction, a pulverized coal blowing line () through which fuel is blown into the furnace body (), a raw material chute () through which a cement raw material is loaded into the furnace body (), at least one air introduction pipe () through which introduced air is sucked, the pulverized coal blowing line (), the raw material chute (), and the air introduction pipe () being connected to a side portion of the furnace body (), and a fluidizing air blowing port () disposed at a bottom portion of the furnace body () and through which fluidizing air is blown into the furnace body (), in which a blowing port of the pulverized coal blowing line () is disposed below a suction port of the air introduction pipe () and above the fluidizing air blowing port ().

Fluidized calciner

The present invention provides a fluidized calciner which can perform sufficient calcination by reducing a rate of unburned fuel at an outlet of the fluidized calciner while preventing occlusion in a preheater. In the present invention, plural pulverized coal blowing lines (), raw material chute () of cement raw material, and first to fourth air introduction pipes (to) are connected to a bottom side wall of a tubular furnace body () whose upper end portion is closed by a top plate (); a fluidizing air blowing port () adapted to blow in fluidizing air is disposed at a bottom of the furnace body (); an exhaust gas duct () is connected to a top side wall of the furnace body located above the first and/or second air introduction pipes () by being spaced away from the top plate (); and blowing ports () of the pulverized coal blowing lines are disposed below suction ports of respective air introduction pipes (to) but above the fluidizing air blowing port (), and at least one of the blowing ports () is placed below the third or fourth air introduction pipe (or).

There is provided a method for operating a cement plant capable of simultaneously optimizing both combustion in a calciner and a heat consumption rate. The method for operating a cement plant includes: feeding first fuel to a calciner; feeding second fuel for maintaining the inside at a burning temperature to a cement kiln along with combustion primary air, and introducing air for cooling cement clinker to a cooler; and feeding a part of the air as secondary air to the cement kiln, feeding as tertiary air to the calciner, and discharging the rest of the air from the cooler, wherein relation between a first oxygen concentration at an exhaust gas outlet of the calciner and a heat consumption rate determined by the first fuel and the second fuel, and relation between a second oxygen concentration at an exhaust gas outlet of the preheater and the heat consumption rate are beforehand obtained, and amounts of the secondary air and the tertiary air are adjusted such that both the first oxygen concentration and the second oxygen concentration fall within a range including values of the oxygen concentrations at which the heat consumption rate becomes at its minimum.

Method for operating cement plant

A method for controlling an NOx concentration in an exhaust gas in a combustion facility by: measuring a reaction velocity kof each of a plurality of chars, each corresponding to a plurality of types of pulverized coals; determining a relationship between the NOx concentration in the exhaust gas and the reaction velocity kfor each of the chars; (iii) blending the plurality of the types of the pulverized coal, wherein a blending ratio of the plurality of the types of the pulverized coal is determined by using, as an index, a reaction velocity kof the char of the blended pulverized coal, which corresponds to a target NOx concentration or below, on the basis of the relationship; and supplying the blended pulverized coal to the combustion facility as the fuel of the combustion facility.

Method for controlling NOx concentration in exhaust gas in combustion facility using pulverized coal

Providing a cement production apparatus in which raw material is supplied into a duct with being dispersed uniformly so that heat-exchanging efficiency is improved by even preheating and clogging and the like are prevented, so that stable operation can be carried out. Between cyclones at an upper stage and a cyclone at a lower stage disposed below cyclones at an upper stage, a ductis provided to introduce exhaust gas to the cyclones at the upper stage with distributing after flowing upward from the cyclone at the lower stage; at a lower position than a distribution partof the duct, a material-supplying pipeis connected for supplying cement raw material; at a connected part of the material-supplying pipeto the duct, a material-guiding chuteon which the cement raw material is supplied from the material-supplying pipeand which drops it into the ductis provided with protruding into the duct; and the material-guiding chuteis formed to have a flat upper surface and to be expandable by sliding so that insertion depth of a tip endfrom an inner-wall surfaceof the ductis 0.15 to 0.5 times of an inner diameter of the duct

Cement production apparatus

A cement production apparatus having: a ductin which exhaust gas drained from a lower cyclone flows upward, distributes and introduces the exhaust gas to upper cyclones; material-supplying pipesfor supplying cement raw material connected to both side parts of one side surface of the ductbelow a distribution partamong the upper cyclones; and a supply-amount controllerprovided on an upstream position above the material-supplying pipesfor controlling supply-amounts of the cement raw material to the material-supplying pipes: and when H is a vertical distance between a horizontal surface Ppassing through centers of distribution outletsof the upper cyclones and a horizontal surface Ppassing through centers of connecting portsof the material-supplying pipes, and D is a diameter of the duct, a ratio H/D is set to 1.4 to 2.5.

To provide a method and facility for enabling COgas generated in a cement manufacturing facility to be separated and recovered at a high concentration. To this end, according to the present invention, the calcination of a cement material and the recovery of COgas generated in a calciner are performed by one of the following steps of: [1] superheating the cement material before calcination to at least the calcination temperature thereof in a superheating furnace and then mixing the superheated cement material with a new cement material before calcination in a mixer/calciner; [2] mixing, in the mixer/calciner, the cement material before calcination with a part of high-temperature cement clinker discharged from a cement kiln; and [3] using an externally heated calciner.

[object Object]

An object of the present invention is to separate COgas generated in a cement-manufacturing facility in a high concentration and recover the COgas. The present invention includes: feeding a cement material before calcination and a heat medium which has a particle diameter larger than that of the cement material and has been heated to the calcination temperature or higher in a medium-heating furnace (), to a mixing calciner (); and recovering the COgas generated by the calcination of the cement material. The heat medium circulates between the medium-heating furnace and the mixing calciner. Another aspect of the present invention includes: feeding a cement material before calcination to a regenerative calciner () which has been heated to the calcination temperature or higher and has stored heat therein; and recovering the COgas generated by the calcination of the cement material.

The organozirconium composite of the present invention has a decomposition temperature which is near the respective decomposition temperatures of an organolead compound and an organotitanium compound. The raw material solution can precisely control the composition of a PZT thin film over a broad temperature range. The raw material solution is less likely to react an organolead compound even when mixed with the organolead compound. The present invention provides a raw material solution which is less likely to cause vapor phase cracking. The organozirconium composite comprises one, or at least two kinds of zirconium chelate complexes containing, as a ligand, both of a first &#x3b2; diketone and a second &#x3b2; diketone having a structure different from that of the first &#x3b2; diketone, wherein, when at least two kinds of zirconium chelate complexes are contained, the coordination numbers of the first &#x3b2; diketone and the second &#x3b2; diketone that coordinate to at least two kinds of zirconium chelate complexes vary depending on the respective zirconium chelate complexes.

Organozirconium composite and method of synthesizing the same, raw material solution containing the same, and method of forming lead zirconate titanate thin film

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Naka, Japan

Yoshinori Takayama