Method for recycling and regenerating steel plant residual heat boiler saturated steam

Abstract

The invention relates to a method to recycle saturated steam from waste heat boiler in steel plant to generate. The method is characterized in that the invention comprises a converter, a converter heat recovery boiler, a steam filtering pressure stabilizer, a saturated steam heating furnace, a heating furnace burner, a low pressure turbine, a motor, a condenser, a condensate pump, a cooling tower, a circulating water pump, a deaerator, a water supply pump, a water supply distributor, a blower, an induced draft fan and a chimney. The invention has the advantages of making full use of the current waste heat boiler of the steel plant, adopting the steam filtering pressure stabilizer and the saturated steam heating furnace, improving efficiency by 140 percent compared with the traditional small-sized medium temperature and medium pressure unit and efficiency being 20 percent up higher than that of the most efficient gas turbine in the world.

Description

[0001] 1. Technical field: [0002] The invention relates to a method for regenerating waste heat in a steel plant, in particular to a method for recovering saturated steam from a waste heat boiler in a steel plant and regenerating power. 2. Background technology: [0003] At present, in addition to producing iron and steel products in the production process of iron and steel plants, there will also be some additional products-waste gas and a large amount of saturated steam for the purpose of cooling various heating furnaces and converters. Due to the current pressure of these saturated steam The flow fluctuates greatly, and it is difficult to be fully utilized. Except for a small amount of utilization, most of them are discharged as waste gas, which not only causes a lot of waste of water resources, but also wastes a lot of heat. [0004] Iron and steel enterprises are large energy consumers in industrial development. Therefore, there is a large potential space for energy-sav...

AI Technical Summary

Problems solved by technology

Especially in private and collective iron and steel enterprises, which account for a considerable proportion of the total iron and steel output, and the production technology and equipment used by these enterprises are relatively backward, there is little room for energy saving and consumption reduction in various production links and environmental pollution reduction. Big

Among them, the water vapor used to cool the fume exhaust hoods of converters in steel plants and other steelmaking and rolling mills cannot be used due to large fluctuations in pressure and flow. Except for a few that are used, most of them are discharged into the air as waste steam. Causes waste of water resources, and at the same time, a lot of heat is taken away with water vapor

At present, the utilization of this energy is mainly in the following aspects: 1. The fluctuating saturated steam is used as a heating source in winter. However, since the steel plant is often far away from the city, the saturated steam is inconvenient for long-distance transportation, so it is only used for heating. very little steam

Therefore, most of them are still discharged, and the utilization rate is very low.

2 A small amount of gas can be used for domestic use, such as gas for dining halls, steam for bathrooms, etc., and these consumptions are also very small; the availability rate is also very low

The main reason for the low utilization rate of saturated steam is that the energy of saturated steam that can be converted into electrical energy is very low; therefore, the energy utilization rate is also relatively low

4Use saturated steam to mix with saturated steam produced by other boilers, and then send it back to the boiler for reheating treatment. The reheated steam is sent to the steam turbine for power generation, but other boilers are required, the investment cost is relatively high, and the use conditions are limited. Low penetration rate

5 It is necessary to build a supplementary combustion boiler, that is, a boiler needs to be built, and then the collected saturated steam is supplemented for superheating treatment, and the superheated steam is sent to the steam turbine for power generation. Other boilers are also required, the investment cost is relatively high, and the use conditions are limited. Restricted, so the penetration rate is not high

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