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Method and device for power generation by utilizing steam generated from waste heat of steel mill in cascade mode

A steam and steel plant technology, applied in the steam generation method using heat carrier, steam engine device, waste heat treatment, etc., can solve the problems affecting the economy and safety of waste heat utilization, the difficulty of ensuring the consistency of steam parameters, and the difficulty of ensuring the consistency of steam, etc. , to achieve the effects of prolonging life, improving quantity and quality, and improving steam quality

Inactive Publication Date: 2012-07-25
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The flue gas volume of the high temperature section at the tail of the sintering machine is generally less than that of the waste heat boiler of the cooler, so setting up a separate waste heat boiler makes the structure complicated and the cost increases
[0006] (2) The temperature and flow rate of the flue gas at the tail of the sintering machine are different from those of the flue gas generated by the cooler. The process is also a dynamic process, and the parameters of the steam produced will fluctuate to a certain extent
In this way, when two streams of steam are merged, since the steam parameters are difficult to ensure consistency, the economy and safety of waste heat utilization will inevitably be affected during the process of combining steam.

Method used

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  • Method and device for power generation by utilizing steam generated from waste heat of steel mill in cascade mode
  • Method and device for power generation by utilizing steam generated from waste heat of steel mill in cascade mode
  • Method and device for power generation by utilizing steam generated from waste heat of steel mill in cascade mode

Examples

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Effect test

Embodiment 1

[0052] A cascaded device for generating steam by using waste heat in steel mills, see attached figure 1 . Including chimney 1, spindle fan 2, sintering machine 3, large flue dust collector 4, cooling machine 5, cooling machine dust collector 6, sintering machine tail gas outlet 7, sintering flue gas outlet bypass valve 8, sintering machine large Flue 9, sintering flue gas dust collector 10, sintering machine tail gas superheater 11, sintering machine tail gas preheater 12, deaerator 13, feed water pump 14, cooler waste heat boiler 15, steam turbine 16, Generator 17, condenser 18, condensate pump 19, circulation fan 20, blower 22, backup fan 21;

[0053] The inlets of the backup fan 21 and the blower 22 are directly communicated with the atmosphere respectively;

[0054] The outlet of the blower 22 is connected to the middle temperature section 23 of the cooler 5;

[0055] Cooler waste heat boiler 15 is provided with flue gas inlet and outlet, working fluid inlet and outlet;...

Embodiment 2

[0064] Taking a certain sintering machine of Baosteel as an example, the sintering area of ​​this sintering machine is 450m2, adopting the cooling waste heat boiler of the present invention + sintering machine exhaust gas preheater + sintering machine exhaust gas superheater, that is, a cascade utilization sintering The method for generating steam and generating electricity from the heat of the flue gas of the tail gas and the flue gas of the cooler, the process steps are as follows:

[0065] (1), use the sintering machine exhaust gas preheater 12 to preheat the condensed water of the steam turbine 16

[0066] Flue gas side flow:

[0067] The sintering flue gas with a temperature of 350°C enters the sintering flue gas dust collector 10 from the tail flue gas outlet 7 of the sintering machine 3, passes through the tail flue gas superheater 11 of the sintering machine after dust removal, and the tail flue gas superheater 11 of the sintering machine The flue gas with an outlet t...

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Abstract

The invention discloses a method and a device for power generation by utilizing steam generated from waste heat of a steel mill in a cascade mode. The device comprises a chimney, a main shaft fan, a sintering machine, a cooling machine, a large flue of the sintering machine, a machine tail flue gas superheater of the sintering machine, a machine tail flue gas preheater of the sintering machine, adeaerator, a feed pump, a waste heat boiler of the cooling machine, a steam turbine, a generator, a condenser, a condensate pump, a circulating fan and the like. Through three process steps of preheating condensed water of the steam turbine by utilizing the preheater in machine tail flue gas of the sintering machine, generating intermediate-temperature steam by heating the waste heat boiler of the cooling machine, heating the intermediate-temperature steam further through the machine tail flue gas superheater of the sintering machine to generate high-temperature steam and the like, the power generation is performed by utilizing the steam generated from the flue gas waste heat of a sintering machine plant fully. The power generation is performed by utilizing the steam generated from the heat of the machine tail flue gas of the sintering machine and the flue gas of the cooling machine of the steel mill, so the quality of the generated steam is improved greatly and meets the requirement of waste heat generation, and a process flow is simple.

Description

technical field [0001] The invention relates to the field of waste heat utilization of sintering process in the iron and steel industry, in particular to a cascaded utilization of heat from sintering machine tail gas and cooler flue gas, that is, by using the preheater in the sintering machine tail gas to preheat the condensed water of the steam turbine, cool the A method for generating medium-temperature steam by heating the machine waste heat boiler, and further heating the medium-temperature steam by the tail gas superheater of the sintering machine to generate high-temperature steam for power generation and the device used therein. Background technique [0002] The iron and steel industry is one of the industrial sectors with the largest energy consumption, and the energy consumption of the sintering process accounts for about 10% of the total energy consumption in the steel production process, ranking second only to the iron-making process. The waste heat resources in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K11/02F01D15/10F27D17/00F22B1/18
CPCY02P10/25Y02P80/15
Inventor 潘卫国胡深亚王文欢姜未汀章玲吴志祥
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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