System for performing hydrochloric acid waste fluid spray roasting through industrial waste heat and control method

A technology of hydrochloric acid waste liquid and industrial waste heat, which is applied in the fields of metallurgy, mechanical processing and chemical industry, can solve the problems of high operating costs, and achieve low operating costs and significant energy saving effects

Active Publication Date: 2015-02-11
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above problems, the object of the present invention is to provide a hydrochloric acid waste liquid spray roasting system using industrial waste heat, aiming to solve the technical problem of high operating costs of the existing hydrochloric acid waste liquid spray roasting system

Method used

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  • System for performing hydrochloric acid waste fluid spray roasting through industrial waste heat and control method
  • System for performing hydrochloric acid waste fluid spray roasting through industrial waste heat and control method

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Experimental program
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Effect test

Embodiment 1

[0041] The waste heat temperature of the industrial flue gas is about 780°C. The heat of the waste heat flue gas can meet the maximum heat demand of the roaster under the condition of full load operation, and the temperature of the flue gas can also meet the temperature required for the decomposition reaction in the roaster (500-650°C).

[0042] Such as figure 1 As shown, in order to realize the utilization of industrial waste heat in the hydrochloric acid regenerative roaster of spray roasting method to provide heat source, one or more waste heat flue gas nozzles should be installed along the tangential direction on the furnace waist of the roaster, and the flow rate of the waste heat flue gas nozzles should be set to 20m / s. The nozzle adopts a tapered type, shrinking from the outside to the inside. Each waste heat flue gas nozzle is connected with the waste heat heat supply pipe, and the waste heat flow regulating valve 22, waste heat flow meter 23 and waste heat switch valv...

Embodiment 2

[0047] The waste heat temperature of industrial flue gas is about 350°C. The heat of waste heat flue gas can meet the maximum heat demand of the roaster under the condition of full load operation, but the temperature of the flue gas cannot meet the temperature required for the decomposition reaction in the roaster (500-650°C). Also can not satisfy the requirement of iron oxide powder quality.

[0048] Such as figure 2 As shown, in order to realize the utilization of industrial waste heat in the hydrochloric acid regenerative roaster of spray roasting method to provide heat source, one or more waste heat flue gas nozzles should be installed along the tangential direction on the furnace waist of the roaster, and the flow rate of waste heat flue gas nozzles should be set to 25m / s. The nozzle adopts a tapered type, shrinking from the outside to the inside. Each waste heat flue gas nozzle is connected with a waste heat heat supply pipe, and a waste heat flow regulating valve 22 ,...

Embodiment 3

[0056] The waste heat temperature of industrial flue gas is about 700°C. Under normal circumstances, the heat of waste heat flue gas can meet the maximum heat demand of the roaster under the condition of full load operation, and the temperature of waste heat flue gas can also meet the temperature required for the decomposition reaction in the roaster (500-650 ℃), but within a certain period of time it cannot meet the heat supply requirements of the roaster of the acid regeneration unit.

[0057] Such as figure 2 As shown, under normal working conditions, waste heat is the main source of heat, supplemented by external gas heating. When the external heating is completely interrupted, the full gas heat source is used for heating. In order to realize the utilization of industrial waste heat in the spray roasting hydrochloric acid regenerative roaster to provide heat source, one or more waste heat flue gas nozzles should be installed along the tangential direction on the furnace w...

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Abstract

The invention is applicable to the fields of metallurgical, machining and chemical industries, and provides a system for performing hydrochloric acid waste fluid spray roasting through industrial waste heat and a control method. The system comprises a roasting furnace, wherein one or more waste heat flue gas nozzles are arranged in the furnace bosh tangential direction of the roasting furnace; each waste heat flue gas nozzle is connected with a waste heat supply system through a waste heat supply pipe; a waste heat flow regulating valve, a waste heat flow meter and a waste heat switching valve are arranged on each waste heat supply pipe; the system comprises a main control board; a temperature sensor is arranged at the furnace top or on the furnace bosh of the roasting furnace; the main control board is connected with the temperature sensor, the waste heat flow regulating valves and the waste heat flow meters. The system uses industrial waste heat as a heat source, provides reaction temperature and heat for the roasting furnace for high-temperature decomposition, uses fuel gas as an auxiliary heat source under the condition that the waste heat source cannot be provided or the heat cannot meet requirements, and guarantees that the reaction is performed normally. The system has an obvious energy-saving effect, and is low in running cost.

Description

technical field [0001] The invention belongs to the fields of metallurgy, mechanical processing and chemical industries, and in particular relates to a system and a control method for spraying and roasting hydrochloric acid waste liquid by using industrial waste heat. Background technique [0002] The hydrochloric acid pickling waste liquid of iron and steel, mechanical processing and chemical enterprises contains a large amount of ferrous chloride, ferric chloride and metal chlorides. The hydrochloric acid waste liquid generally uses the spray roasting method to regenerate the waste acid. The regeneration process is as follows: the waste acid is concentrated through direct heat exchange with the hot roasting gas generated by the roaster in the pre-concentrator to cause part of the acid liquid to evaporate. The concentrated purified waste acid is continuously fed into the roasting furnace with a constant amount of acid liquid through the frequency conversion control pump, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D19/00F23N5/00
CPCY02P20/10
Inventor 赵金标王军秦健高俊峰
Owner WISDRI ENG & RES INC LTD
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