A kind of white carbon black spray drying system and method

Abstract

The invention provides a white carbon black spraying and drying system and a method. The system comprises a gas turbine, wherein a gas inlet of the gas turbine is connected with a gas source; a waste gas outlet of the gas turbine is communicated with a direct combustion type hot blast heater; a high-temperature gas outlet of the hot blast heater is communicated with a gas inlet of a drying tower; a material inlet of the drying tower is communicated with a slurry pot; an outlet of the drying tower is communicated with an inlet of a gas-solid separator; the outlet of the gas-solid separator is connected with a wastewater recycling system; clean gas and air are conveyed into the gas turbine to combust and the gas turbine utilizes high-grade thermal energy to generate power; clean low-grade and low-temperature smoke is used as a main heat source of the drying tower so as to realize stair-step and efficient utilization of energy sources; the direct combustion type hot blast heater is used for generating clean and high-temperature hot air to directly heat white carbon black slurry; the drying heat efficiency is high; a high-temperature-resisting stainless steel pipe heat exchanger which needs to be used for indirectly heating a fire coal hot blast heater is saved and the problems that the fault rate of the high-temperature heat exchanger is high and the price is expensive are solved; the equipment reliability is high and the operation and maintenance costs are low.

Description

technical field [0001] The invention relates to the field of energy utilization and drying, in particular to a white carbon black spray drying system and method. Background technique [0002] (1) Production characteristics of white carbon black [0003] White carbon black is a white, non-toxic, amorphous fine powder, its SiO 2 The content is more than 90%, good chemical stability, high temperature resistance, non-flammable, non-toxic, tasteless and good electrical insulation. Silica has a wide range of uses. It can be used as a reinforcing agent for rubber products and tires (such as engineering machinery tires, radial tires, rubber shoes, bicycle color tires, latex products, etc.), and as a dispersant and carrier. Widely used in medicine, pesticides , solid fire-fighting materials, coatings and inks, can also be used as carriers or flow aids in pesticides, feeds, etc., used as abrasives and thickeners in toothpaste, as sedimentation agents and matting agents in coatings, ...

AI Technical Summary

Problems solved by technology

[0013] The silica box drying technology, drum drying technology, spin flash drying technology and heat pipe drying technology developed in the 1980s and 1990s have the following disadvantages: the inlet hot air temperature of the dryer is all lower than 600 °C , the thermal efficiency of drying is low; the degree of automation of the drying process is low, the labor intensity is high, the output of a single machine is low, and continuous production cannot be realized, etc.

[0015] (1) Using indirect heating to use coal-fired high-temperature flue gas to indirectly heat clean air will inevitably cause a certain heat transfer temperature difference between the high-temperature flue gas temperature and the hot air temperature, and the thermal efficiency will decrease;

[0016] (2) Although heat-resistant stainless steel (such as 310S) can withstand a certain high temperature, the life of the heat exchange is very limited when the flue gas temperature is as high as 800 °C or higher, and the failure rate and operation and maintenance costs of the hot blast stove are high;

[0017] (3) Both sides of the heat-resistant stainless steel tube of the indirect heat exchange hot blast stove pass through gas, and the comprehensive heat transfer coefficient of indirect heat exchange between gases is low. In order to complete a certain amount of heat exchange, a very large heat exchange area is required, not only It occupies a large area, and due to the high price of heat-resistant stainless steel (up to 80,000 yuan / ton), the cost of the hot blast stove is high

[0018] (4) Coal-fired hot blast stoves have emissions of air pollutants such as sulfur dioxide, nitrogen oxides, and dust, which have adverse effects on the local environment of the hot blast stove

Under the current strict requirements on the total emission of air pollutants in my country, coal-fired hot blast stove projects in many areas cannot pass the environmental impact assessment, and their promotion and application are limited.

[0019] In addition, 70% to 80% of the composition of the silica slurry is water, which is converted into water vapor during the drying process of the slurry, and is directly discharged into the atmosphere with the flue gas, resulting in a waste of water resources

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