Abstract: The invention relates to a method and a device for improving heat transfer in a circular plate heat exchanger (1), as well as a heat transfer plate to be used therein. The invention is based on changing the flow conditions in the radial direction in such a way that the heat transfer remains even. The ridges between the grooves of the heat transfer plates (10) may be, in their shape, evolvent graphs or the like.

Abstract: The invention relates to a method and a device for improving heat transfer in a circular plate heat exchanger (1), as well as a heat transfer plate to be used therein. The invention is based on changing the flow conditions in the radial direction in such a way that the heat transfer remains even. The ridges between the grooves of the heat transfer plates (10) may be, in their shape, evolvent graphs or the like.

Abstract: A method of removing sulphur oxides from flue gases, in which method lime such as calcium carbonate is fed into a separate reactor space positioned in a boiler. In the reactor space the lime is converted into calcium oxide and carbon dioxide under the influence of the temperature prevailing in the furnace of the boiler. Pressurized air causes the calcinating lime and the obtained calcium oxide to flow through the tubular space, whereby at the other end of the space substantially all lime has been converted into oxide and is fed therefrom into the boiler among its flow of flue gases for the actual desulphuration reaction.

Abstract: A process for causing gaseous trace element particles to pass from a flowing hot gas into a fine particulate material by means of water. A mixture of the hot gas and water drops is caused to flow substantially upwards at such a velocity that the water drops remain in the gas flow and for a period long enough for most of the mass of the water drops to evaporate in order to cool the gas and to increase its relative humidity. After the gases have reached their wet temperature, they are brought into a turbulent state in order to cause the dust particles and the water drops which have decreased through evaporation to impinge against each other in order to produce in the aqueous film which covers the dust particles an exothermal ion reaction between the gaseous water-soluble trace element particles and the fine particles. Thereafter, the mixture is caused to flow further in order to evaporate the remaining water by means of the heat of reaction so that a dry end product is obtained.