Hazardous waste salt pyrolysis system and pyrolysis process thereof

Abstract

The invention relates to a hazardous waste salt pyrolysis system and a pyrolysis process thereof, the hazardous waste salt pyrolysis system is used for removing organic impurities in hazardous waste salt, the pyrolysis system comprises a drying reactor (1), a crusher (2), a pyrolysis reactor (3), a cyclone dust collector (4), a spray tower (5), a demister (6), an incinerator (7) and a heat exchanger (8); a solid outlet of the drying reactor is connected with a solid inlet of the pyrolysis reactor through the crusher, and a gas outlet of the drying reactor is connected with a first inlet of the cyclone dust collector; the pyrolysis salt outlet (322) is connected with an inorganic matter impurity removal system (9), the pyrolysis gas outlet (321) is connected with a second inlet of the cyclone dust collector, and the heating flue gas outlet (302) is connected with a gas inlet of the drying reactor; an outlet of the cyclone dust collector is connected with an inlet of the heat exchanger through the spray tower, the demister and the incinerator, a flue gas outlet of the heat exchanger is connected with a heated flue gas inlet (303) of the pyrolysis reactor, and a steam outlet of the heat exchanger is connected with the inorganic matter impurity removal system.

Description

technical field [0001] The invention relates to an industrial waste salt treatment technology, in particular to a hazardous waste salt pyrolysis system and a pyrolysis process thereof. Background technique [0002] Waste salt is a by-product crystalline salt produced in industrial production. Its main sources include by-products of chemical production and water treatment processes such as pure water preparation, chemical preparation, and high-salt wastewater treatment. According to statistics, my country's annual output of waste salt exceeds 20 million tons, accounting for 37.4% of the annual hazardous waste generation. Waste salt can be divided into three categories according to its composition: single waste salt, mixed salt and mixed salt. Most of the waste salt has complex composition, is difficult to handle, and is very harmful to the environment. According to the current regulations on hazardous waste, waste salt that needs to be managed and disposed of as hazardous wa...

AI Technical Summary

Problems solved by technology

However, most of the current pyrolysis devices and pyrolysis methods have many problems such as low system thermal efficiency, high energy consumption, and poor equipment sealing performance, which cannot meet the requirements of harmless and resourceful treatment of hazardous waste salt

[0004] Chinese patent 201821584652.4 discloses an industrial waste salt and waste slag treatment device. A heating sleeve is arranged outside the drum of the pyrolysis device, which is heated by electromagnetic induction. The feeding device, pyrolysis device and post-processing device are sealed and fixed by sealing parts Connection, due to the large size of the connection between the dynamic and static parts of the drum and the heating sleeve, the sealing performance of the equipment cannot be guaranteed, which increases the risk of air leakage into the drum, which may easily lead to equipment explosion hazards

In addition, the service life of electromagnetic induction components is short, and the heating process is difficult to control

[0005] Chinese patent 201821394486.1 discloses a special rotary kiln for pyrolytic oxidation of solid waste salt. Solid waste salt is pyrolytically oxidized by direct contact with high-temperature flue gas. Although it has the characteristics of high heat exchange efficiency, the flue gas generated by direct contact heating Large amount and high solid carrying capacity in the flue gas, which increases the cost of downstream flue gas purification treatment

Moreover, the rotating cylinder and the heating furnace in this patent are rotationally connected, and special sealing protection is not adopted. Due to the large connection size of the dynamic and static parts and the poor sealing performance of the equipment, not only is there a greater risk of air leaking into the cylinder , and the high-temperature flue gas is more likely to leak into the atmosphere, which is likely to cause safety or environmental accidents

Images