Water-to-steam heating method and steam direct-heating machine

Abstract

The invention provides a water-to-steam heating method comprising the following steps: (1) water at medium and low temperatures below 100 DEG C enters an evaporator to be subjected to flash evaporation to generate steam; (2) the steam flows into a radiator to be condensed and emit heat to the outside; (3) condensed water in the radiator and non-condensable gases flow into a closed condensed water recycling device; (4) the condensed water in the condensed water recycling device is pumped out through a water pump; and (5) the non-condensable gases are pumped out through a vacuum pump. The invention further provides a steam direct-heating machine which structurally comprises the evaporator, a heat supply pipe system, the radiator and the condensed water recycling device; water at medium and low temperatures below 100 DEG C enters the evaporator to be subjected to flash evaporation to generate steam, which flows into the radiator, is condensed in the radiator and emits heat to the outside; condensed water and non-condensable gases accumulated in the radiator enter the condensed water recycling device; and the condensed water in the condensed water recycling device is pumped out through the water pump, and the non-condensable gases are pumped out through the vacuum pump.

Description

technical field [0001] The invention relates to heat exchange technology, in particular to a steam direct heat engine. Background technique [0002] my country is already a big country in steel production, and the annual output of steel accounts for 40% of the world's total output. Whether it is steelmaking or ironmaking, a large amount of slag will be produced. Slag is produced along with iron and steel. It is a by-product of iron and steel smelting, and it is also the basic condition for a series of important metallurgical reactions. It directly participates in the physical and chemical reactions and mass and heat transfer processes of iron and steel smelting. It not only affects the output of iron and steel, quality, and is closely related to the consumption of raw materials and energy. [0003] In iron and steel metallurgical furnaces, high-temperature slag at 1400-1500°C is produced. After flowing out through the slag mouth, and then entering the slag flushing launder...

AI Technical Summary

Problems solved by technology

[0011] 1. Due to the complex impurity components contained in the medium and low temperature wastewater, if the usual partition wall heat exchanger is used to recover heat energy, the partition wall of the heat exchanger will soon be polluted by scaling and cannot work normally;

[0012] 2. The heat transfer coefficient of the partition wall heat exchanger is low;

[0013] 3. For high-rise heating, the water pump consumes a lot of power

[0015] But this kind of direct heating machine has a problem. When heating the heating circulating water through the partition wall, its thermal resistance is relatively large, which affects the total heat transfer coefficient of the direct heating machine.

[0016] The working conditions of medium and low temperature wastewater heat exchangers are very different from ordinary heat exchangers. The design method and experience of ordinary heat exchangers cannot be used for medium and low temperature wastewater heat exchangers.

Although the design method and manufacturing process of ordinary heat exchangers are very mature, the scientific design method of medium and low temperature wastewater heat exchangers has not been well solved so far.

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