Abstract:
A process for recovering the byproducts of a process that burns coal and for reusing the byproducts is disclosed. The process includes the steps of identifying a disposal site that contains the byproducts (typically fly ash and bottom ash), removing at least a portion of the byproducts from the disposal site, analyzing a sample of the portion of the byproducts to determine the loss on ignition of the portion of the byproducts, introducing the portion of the byproducts along with pulverized coal into a pulverized coal furnace if the portion of byproducts have a loss on ignition greater than or equal to a predetermined loss on ignition value (typically greater than or equal to 1 to 5 %), and burning the portion of the byproducts in the furnace with the pulverized coal to render the byproducts into a commercially valuable fly ash and bottom ash having very low loss on ignition, typically lower than 3 %.
Abstract:
In order to stably operate a boiler using several kinds of solid fuels including depleted ash as fuels, adhesion of ash is suppressed. A calculator (9) preliminarily collects properties of a solid fuel, such as the content rate of ash and the composition of an ash constituent, as data (8). The calculator (9) uses the mix ratio of solid fuels as a parameter and calculates the composition of an ash constituent of the mixed fuels on the basis of the preliminarily measured composition of the ash constituent of each solid fuel. The calculator (9) determines a reference value of the rate of slug by which the ash deposition ratio is reduced on the basis of the relationship between the preliminarily measured ash deposition ratio and the slag ratio. Further, the calculator (9) calculates the mix ratio of each solid fuel using a thermodynamic equilibrium calculation so as to obtain an ash composition in which the slag ratio is not more than the determined reference value. On the basis of the mix ratio of each solid fuel calculated by the calculator (9), the amount of solid fuel dispensed from hoppers (1, 2) is adjusted by a fuel supply amount adjusting device (3). Thus, each solid fuel, the dispensed amount of which has been adjusted, is mixed by a mixer (4) and crushed by a crusher (5) before being supplied to a boiler (7) as a fuel and burned by a burner (6).
Abstract:
PROBLEM TO BE SOLVED: To provide a biomass pulverizing device and a biomass/coal co-combustion system, allowing an efficient discharge of pulverized biomass powder to the outside.SOLUTION: This biomass pulverizing device includes: a pulverizing device body 13 having a raw material supply pipe 12 supplying biomass material 11 from above in the vertical direction; a pulverizing table 14 whereon the supplied biomass material 11 is placed; a drive part 15 rotationally driving the pulverizing table 14; pulverizing rollers operating in conjunction with the rotation of the pulverizing table 14 and pulverizing the biomass material 11 by pressing force; and a blast means forming an upward flow upward from below on the outer circumferential side of the pulverizing table 14, and jetting a carriage gas 18 airflow-carrying the pulverized biomass powder 17. The biomass pulverizing device further includes: an erected weir 14a formed on the periphery of the pulverizing table 14; and a first extended weir 31 which is formed with a plurality of slits, is extended from the pulverizing device body 13 side of lower parts of the pulverizing rollers, and forms a prescribed gap to the upper face side of the erected weir 14a.
Abstract:
PROBLEM TO BE SOLVED: To provide a biomass-grinding device which efficiently, stably grinds a biomass raw material; and to provide a system for combusting a mixture of biomass and coal.SOLUTION: The biomass-grinding device includes: a grinding device body 13 having a raw material-feeding pipe 12 which feeds a biomass raw material 11 from above in a vertical axis direction; a grinding table 14 on which the biomass raw material 11 is placed; a driving part 15 which rotatively drives the grinding table 14; grinding rollers 16 which operate in connection with the rotation of the grinding table 14 and grinds the biomass raw material 11 by means of pressing force; a blower means which generates a rising air current which flows, in an upward direction, from below the side of the external periphery of the grinding table 14 and spouts out a carrier gas 18 which carries the ground biomass raw material 17 by the air current; and a classifier 19 which classifies the ground biomass raw material 17 which accompanies the carrier gas. In addition, a plurality of radial table grooves are formed on the surfaces of the table liners 14b of the grinding table 14 from their internal peripheral parts toward the external edge sides thereof, and the front ends of the grooves are located up to the vicinities of the center parts of the table liners.
Abstract:
본 발명에서 사용되는 연산기(9)는, 1종류 이상의 고체 연료를 혼합하는 경우의 상기 고체 연료의 혼합 비율을, 소정의 분위기 온도에 있어서의 혼합 후의 고체 연료의 슬래그 점성의 값이 기준값 이상으로 되도록 산출하여 결정한다. 연료 공급량 조정 장치(3a, 3b)는, 상기 혼합 비율에 기초하여, 보일러에의 상기 고체 연료의 공급량을 조정한다. 이에 의해 본 발명은, 열질탄을 포함하는 다양한 종류의 고체 연료를 연료로서 사용하는 경우라도, 보일러 내에 있어서의 회의 부착을 간편하고 또한 고정밀도로 예측하여, 회의 부착을 억제할 수 있도록 한다.
Abstract:
A method for controlling an NOx concentration in an exhaust gas in a combustion facility by: measuring a reaction velocity ki of 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 ki for 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 kblend of 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.
Abstract:
A method and apparatus for automatically sorting and blending coal and other fuel stocks through a computer-controlled process in order to achieve a specified blend of materials. By sorting fuel stocks with different characteristics into different stacking points, an operator can then automatically combine and uniformly blend these sorted fuel stocks to create a variety of blended materials with different properties tailored to the specific needs of the operator or end user. The computer-controlled nature of the process allows for precise blending in an automated and more efficient and reproducible fashion.