Process and device for continuous treatment of high-concentration organic wastewater

A process for continuous treatment of high-concentration organic wastewater, comprising the following steps:

• step 1, separation of high-concentration organic wastewater:
• transporting high-concentration organic wastewater to a multilayer evaporator (4) by utilizing a feeding pump (1), wherein the high-concentration organic wastewater passes through a liquid flowmeter (3);
• evaporating and separating the high-concentration organic wastewater to vaporize organic light components and water in high-concentration organic wastewater to form wastewater steam containing light components by utilizing the multilayer evaporator (4);
• extracting the generated wastewater steam containing the light components from a heat pump (5) through a top outlet of the multilayer evaporator (4);
• and discharging heavy components of the multilayer evaporated wastewater from a second valve (22) through a bottom outlet of the multilayer evaporator (4);
• step 2, purification of the wastewater steam containing the light components:
• sequentially flowing the wastewater steam containing the light components through a cold fluid channel of a heat exchanger (6) and a first preheater (7) to heat the wastewater steam containing the light components;
• introducing the wastewater steam containing the light components into a first desulfurizer (8) together with air;
• performing a first desulfurization reaction on the wastewater steam containing the light components in present of air to form a first desulfurized tail gas;
• discharging the first desulfurized tail gas from a bottom of the first desulfurizer (8) and flowing the first desulfurized tail gas into a first catalytic combustor (9);
• performing a purification reaction on the first desulfurized tail gas to form a first purified high-temperature steam;
• and flowing the first purified high-temperature steam into a hot fluid channel of the heat exchanger (6) for heat exchange, wherein the first purified high-temperature steam heats the multilayer evaporator (4) as a heat source, and is discharged as purified water after heat exchange and condensation;
• and
• step 3, regeneration of a desulfurizing agent included in the first desulfurizer (8) and a catalyst included in the first catalytic combustor (9):
• switching the wastewater steam containing the light components to a second reaction route after the desulfurizing agent in the first desulfurizer (8) and the catalyst in the first catalytic combustor (9) are deactivated;
• flowing the wastewater steam containing the light components into a second desulfurizer (10) at first together with air;
• performing a second desulfurization reaction on the wastewater steam containing the light components in present of air to form a second desulfurized tail gas;
• flowing the second desulfurized tail gas into a second catalytic combustor (11);
• performing a purification reaction on the second desulfurized tail gas to form a second purified high-temperature steam;
• flowing the second purified high-temperature steam into the hot fluid channel of the heat exchanger (6), wherein the second purified high-temperature steam heats the multilayer evaporator (4) as a heat source;
• and introducing air into the first desulfurizer (8) and the first catalytic combustor (9) respectively for regeneration and activation of the desulfurizing agent and the catalyst at 500-600° C. and forming a regenerated tail gas, and the regenerated tail gas discharged from the first desulfurizer (8) and the first catalytic combustor (9) is merged and purified centralizedly.