A method and system for heating waste slurry using steam-cured waste steam multi-stage steam-water separation

Abstract

The invention discloses a method and system for heating waste slurry by utilizing multistage steam-water separation of autoclaved curing waste steam. The method comprises the following steps of connecting tail steam discharged from an autoclave to a second steam-water separator through a steam outlet pipe, connecting a first steam exhaust pipe at the top of the second steam-water separator to a steam coil pipe in a still room, connecting an outlet of the steam coil pipe to a third steam-water separator through a second steam exhaust pipe, connecting a third steam exhaust pipe at the top of thethird steam-water separator to a S-shaped pipe in a soft water tank, connecting an outlet of the S-shaped pipe to a fourth steam-water separator, extending a fifth steam exhaust pipe at the top of the fourth steam-water separator into a waste slurry tank, continuously spraying steam into the waste slurry tank, and setting the relation between the steam spraying time and the steam pressure of an outlet of a nozzle to be t = 1 / (0.35-0.5) P. According to the method, the heating temperature of waste slurry can be accurately controlled, the influence of the waste slurry on the quality fluctuation of an aerated block is reduced to the minimum, so that the stability of the quality of the aerated block is ensured; and the waste heat of waste steam is fully utilized, so that the production costis reduced, and the economic benefits of enterprises are improved.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of steam-cured waste steam, and in particular relates to a method and system for heating waste pulp by using steam-cured waste steam for multi-stage steam-water separation. Background technique [0002] The autoclave will produce a large amount of waste steam after autoclaving and curing the aerated block. The waste steam contains a lot of heat. If it is discharged directly, it will not only waste a lot of heat source, but also cause thermal pollution to the environment. Therefore, most manufacturers now introduce these waste steam into the rest room to provide the temperature for the initial curing of the aerated block pouring. However, the temperature of the rest room is generally 48-68°C, and the temperature of the steam coming out of the coil in the rest room is still very high. High, such direct discharge will also cause waste and pollution of heat sources. At the same time,...

AI Technical Summary

Problems solved by technology

However, in the prior art, the waste slurry is not heated, which increases the mixing and grinding time of the material, which is not conducive to reducing the production cost

In addition, the waste slurry should reach the process requirement of 45°C before stirring and pouring. If the temperature is not enough, it is necessary to heat the slurry metering tank with steam. During the heating process, a large amount of steam will be consumed, which will increase the steam supply of the boiler and increase energy consumption.

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