Turbo thin layer deep drying reduction+collaborative incineration

1. Scheme Description

Processing objective: The remaining oil sludge (with oil content ≤ 5% and water content ≥ 70%) after physical separation of "two-phase/three-phase", or the "mixed three sludge" in the refinery.

Recommended technical route: First, dry and co incinerate to convert into heat energy, while disposing of hazardous waste and recovering the heat value from oil sludge. The turbulent thin layer drying process is adopted, which first deeply dehydrates the oily sludge, reducing the water rate from 65-85% to 20-25%, in order to achieve the goal of reducing volume and increasing calorific value. Then, the existing incinerator is used to convert it on site to serve production or activity needs again.

Disposal objective: The oil sludge will completely disappear, and the hazardous waste of oil sludge that originally needed to be outsourced at a huge cost will be transformed into biomass fuel products that can be used for self combustion. After collaborative incineration, the residue will be used as building materials to achieve "zero hazardous waste".

2. Process flow

Figure 1 Process flow

This plan adopts a joint disposal plan of "turbine thin layer deep drying reduction+collaborative incineration". The core value is reflected in: building on the existing centrifugal dewatering machine sludge discharge section, continuing to dry oily sludge with a moisture content of 80% to dry sludge with a moisture content of 30% to produce high calorific value biomass fuel. Then, the dry sludge is converted into hot steam required for drying through a fertilizer plant boiler, and the wet sludge at the front end of drying is recycled to reduce external energy consumption in the entire production process to zero; The burned ash is used as a high-quality cement substrate to make road cement bricks for urban construction; Low cost implementation of the goal of breaking sludge into smaller parts for disposal.

Figure 2 Changes in Oil Mud Properties

3. Advantages of the plan

Compared to other disposal options, this plan clearly has the following unique advantages:

Intensification: Setting up oily sludge disposal workshops within the water plant, which can collect hazardous waste such as oily sludge generated from various sub plants in a centralized manner. Under unified supervision, deep drying can be carried out in batches within the workshops to turn waste into treasure and produce biomass fuel, avoiding various costs and hidden dangers caused by diversified investment and construction;

Mechanization: Fully automated mechanized operation, safe, efficient, stable, in line with the trend of industrialization;

Reduction: Deep drying can significantly reduce the volume and weight of oil sludge with high water content, making it easier to transport and store;

Harmless treatment: The drying process is accompanied by a series of biological and chemical reactions, making the characteristics of dry sludge more stable, safe, and hygienic;

Stabilization: After drying, the sludge has stable properties and will not decay or smell. It can be stored for a long time or transported conveniently, reducing the harm to workers;

Resource utilization: After drying, the sludge becomes granular and can be used as fuel (with a calorific value of over 3000kcal/kg), replacing coal for incineration in power plants, cement plants, and fertilizer plants, saving fossil fuel procurement costs.