Abstract: A hydrocarbon recovery method for recovering a production fluid containing hydrocarbons from a production well provided in the ground in which Type 1 microorganisms that produce a biological membrane (biofilm) and Type 2 microorganisms that produce carbon dioxide for promoting deposition of calcium carbonate exist, the hydrocarbon recovery method includes injecting, into the production well, a culture medium for increasing the Type 1 microorganisms; injecting, into the production well, a composition used for the Type 2 microorganisms to produce carbon dioxide, decompressing an inside of the production well after the culture medium and the composition are injected, and recovering the hydrocarbons in a state where the inside of the production well is decompressed.

Abstract: A control system for a pulverized coal fired boiler provided with a pulverized coal producing equipment including a coal feeding section, a milling section and a classifying section and an adjuster for adjusting a coaling rate thereof, and a pulverized coal burning equipment for burning the pulverized coal supplied from the pulverized coal producing equipment includes an estimation apparatus for estimating a coaling rate of coal out form the pulverized coal producing equipment, and an apparatus for operating the adjuster to adjust a coaling rate of coal supplied from the pulverized coal producing equipment to the pulverized coal burning equipment on the basis of an estimation of the estimation apparatus. The estimation is conducted by calculation of mathematical models which are obtained with taking the physical mechanism in the pulverized coal producing equipment and simulate a heat input with higher accuracy.

Abstract: A boiler/turbine plant controlling apparatus comprises a circuit for driving a turbine inlet steam flow regulator valve on the basis of a difference between a load command signal adjusted by a thermal stress value of a turbine and an actually measured output signal of a plant; a circuit for driving a boiler feed water flow regulator valve on the basis of a difference between a value which is obtained by adding a boiler feed water amount with a super heater feed water amount and a value represented by a boiler input command signal; a circuit for driving a fuel flow regulator valve in accordance with an actually measured fuel amount and a fuel command signal corrected by a difference signal between a primary steam temperature setting signal and a steam temperature signal representative of a primary steam temperature measured value; a circuit for driving a super heater water feed valve on the basis of a difference value between the primary steam temperature setting signal and the steam temperature signal; a circ