CN204601988U - A kind of device reducing catalysis fume desulfurizing tower loop slurry COD - Google Patents

Abstract

A device for reducing the COD of circulating slurry in a catalytic flue gas desulfurization tower, mainly composed of a desulfurization tower and an oxidation injection system, the desulfurization tower is respectively provided with a catalytic flue gas inlet pipeline, a flue gas discharge pipeline and a waste water delivery pipeline; The oxidation injection system includes an injection pump and an injector connected in sequence through a pipeline, the inlet end of the sandblasting pump is connected to the desulfurization tower through a pipeline, and the outlet end of the injector is provided with a power nozzle and connected to the desulfurization tower through a pipeline. Connect the air inlet line and valve to the injector. The utility model can effectively reduce the COD of the circulating slurry of the catalytic flue gas desulfurization tower, the system structure is simple, no booster fan or pressure control system is required, the operation is convenient, the pressure loss of the process is small, and the water source is saved, and the COD of the slurry is ≤0.05g /L, which ensures the long-term operation cycle of the device.

Description

A device for reducing COD of circulating slurry in catalytic flue gas desulfurization tower

technical field

The utility model relates to the field of catalytic flue gas purification in the petrochemical industry, in particular to a device for reducing the COD of circulating slurry in a catalytic flue gas desulfurization tower.

Background technique

The catalytic flue gas desulfurization tower is a device used to purify the catalytic flue gas, in which the absorption of SO2 and the removal of a considerable part of particulate matter (dust) are completed in an open, unfilled counter-flow desulfurization tower. The flue gas passes through the desulfurization tower in the vertical direction, the absorption layer is sprayed into the alkaline solution, and the flue gas and the alkaline solution form a countercurrent. Sulfur dioxide and particulate matter (dust) are removed from the flue gas. If the slurry at the bottom of the tower is discharged directly, the COD is high, which will increase the operating load of the wastewater treatment system. At the same time, the water, electricity, and alkali consumption of the entire flue gas purification device are all increased, resulting in an increase in operating costs. COD (Chemical Oxygen Demand) is an important indicator of organic pollution in water bodies. It is a chemical method to measure the amount of reducing substances that need to be oxidized in a water sample. The oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants in wastewater, wastewater treatment plant effluent and polluted water. In the study of river pollution and the nature of industrial wastewater and the operation and management of wastewater treatment plants, it is an important and quickly measured organic pollution parameter, often expressed by the symbol COD.

Utility model content

The purpose of this utility model is to provide a device for reducing the COD of circulating slurry in a catalytic flue gas desulfurization tower, which is simple in structure, convenient in operation, good in reducing COD, and saves water.

The specific technical scheme of the utility model is: mainly composed of a desulfurization tower and an oxidation injection system. The injection pump and the injector connected by the pipeline in turn, the inlet end of the injection pump is connected to the desulfurization tower through the pipeline, the outlet end of the injector is provided with a power nozzle and connected to the desulfurization tower through the pipeline, and the air inlet pipeline is connected to the injector and valves.

The above programs further include:

The device for reducing the COD of the circulating slurry of the catalytic flue gas desulfurization tower also includes a circulating slurry circulation system, the circulating slurry circulation system includes a nozzle located at the upper part of the desulfurization tower inner cavity and a slurry circulation pump located outside the desulfurization tower, and the slurry circulation The inlet end of the pump is connected to the lower part of the desulfurization tower through a pipeline, and the outlet end is connected to the spray head through a pipeline.

The desulfurization tower is connected with a lye pipeline and a lye control valve.

The circulating slurry circulation system is equipped with a pH value online analyzer, and it can be linked with the lye control valve to control and adjust the pH of the slurry.

A gate valve and a check valve are provided on the air inlet pipeline.

The utility model can effectively reduce the COD of the circulating slurry of the catalytic flue gas desulfurization tower, the system structure is simple, no need to install a booster fan or a pressure control system, the operation is convenient, the pressure loss of the process is small, and the water source is saved, and the COD of the slurry is ≤0.05g /L, which ensures the long-term operation cycle of the device.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

In the figure: 1- catalytic flue gas inlet pipeline, 2- desulfurization tower, 3- circulating slurry extraction pipeline, 4- jet pump, 5- injector, 6- power nozzle, 7- air inlet pipeline, 8- air inlet gate valve, 9-Air inlet check valve, 10-Wastewater delivery valve, 11-Wastewater delivery pipeline, 12-Circulation slurry delivery valve, 13-Slurry circulation pump, 14-Nozzle, 15-PH value online analyzer, 16- Alkali pipeline, 17-alkali control valve, 18-flue gas exhaust pipeline.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

Referring to Figure 1, a device for reducing the COD of circulating slurry in a catalytic flue gas desulfurization tower is mainly composed of a desulfurization tower 2, an oxidation injection system, and a circulating slurry circulation system. The desulfurization tower 2 is respectively provided with a catalytic flue gas inlet pipeline 1 and a lye pipeline 16 and lye control valve 17, flue gas discharge pipeline 18, waste water delivery pipeline 11 and waste water delivery valve 10; the oxidation injection system includes jet pump 4 and injector 5 connected in sequence through the pipeline, and the inlet port of jet pump 4 The desulfurization tower 2 is connected through the circulating slurry extraction pipeline 3, the outlet end of the injector 5 is provided with a power nozzle 6 and connected to the desulfurization tower 2 through the pipeline, and the injector 5 is connected with the air inlet pipeline 7, the air inlet gate valve 8, and the air inlet check valve 9. The circulating slurry circulation system includes a nozzle 14 located on the upper part of the inner cavity of the desulfurization tower 2 and a slurry circulation pump 13 located outside the desulfurization tower 2. The lower connection and the outlet end of the nozzle are connected to the nozzle 14 through the return line, and the return line is provided with a pH online analyzer 15, which can be linked with the lye control valve 17 to control and adjust the pH of the slurry.

The working process of the above-mentioned device is as follows:

The catalytic flue gas enters the desulfurization tower 2 through the catalytic flue gas inlet pipeline 1, and a nozzle 14 is installed in the tower body to spray and absorb sulfur dioxide, particulate matter (dust) and other impurities in the flue gas. In order to lower the COD of the discharged waste liquid, the liquid extracted from the bottom of the desulfurization tower passes through the circulating slurry extraction line 3 and enters the external oxidation system for oxidation. After being fully contacted and mixed with air by the injector 5, it returns to the desulfurization tower 2; 7. Enter the injector 5 through the air inlet gate valve 8 (or stop valve) and check valve 9.

The external oxidation injection system is composed of an injector 5 and an injection pump 4. The injector 5 is an oxidation air injector. The liquid is delivered by the injection pump 4 to the injector and the power nozzle 6. After being sprayed by the power nozzle 6, the liquid becomes a droplet. It is then thoroughly mixed with jet air to oxidize the sulfite dissolved in the circulating fluid with the air. After the air injector, the circulating fluid containing very finely dispersed bubbles flows back into the desulfurization tower 2. When these bubbles rise to the surface of the pool, the residual oxygen further undergoes an oxidation reaction with the circulating fluid. The pressure loss of the air oxidation treatment process is small, and there is no need to install a booster fan or a pressure control system.

After the circulating slurry at the bottom of the tower flows out through the circulating slurry pipeline at the bottom of the tower, it returns to the nozzle 14 of the desulfurization tower 2 through the circulating slurry delivery valve 12 and the slurry circulating pump 13 for spraying. A pH value online analyzer 15 is arranged on the circulating liquid pipeline. The pH value of the circulating fluid is adjusted and maintained at 6.5-8 by linkage control of the flow rate of the lye control valve 17. After spray absorption, sulfur dioxide and particulate matter (dust) in the flue gas are removed. The waste water generated by the circulating slurry is discharged into the waste water treatment unit through the waste water delivery pipeline 11 and the waste water delivery valve 10 for treatment.

The flue gas after dedusting is discharged into the atmosphere through the flue gas discharge pipeline 18.

To sum up, the system for reducing the COD of circulating slurry in the desulfurization tower in the utility model has a simple structure, does not need a booster fan or a pressure control system, is easy to operate, has small pressure loss in the process, and saves water sources. The COD of the slurry is less than or equal to 0.05g/L , to ensure the long-term operation cycle of the device.

For those of ordinary skill in the art, without departing from the principle of the utility model, it is possible to make some improvements and modifications to the specific dimensions, the number of oxidation injection systems or the local structure, and these improvements and modifications should also be considered It is the protection scope of the utility model.

Claims (5)

1. reduce a device of catalysis fume desulfurizing tower loop slurry COD, it is characterized in that: primarily of desulfurizing tower, oxidation spraying system composition, described desulfurizing tower is respectively equipped with catalysis smoke inlet pipeline, the outer comb line of flue gas and waste water and sends pipeline outside; Described oxidation spraying system comprises the jet pump and injector that are connected successively by pipeline, the entrance point of described jet pump connects desulfurizing tower by pipeline, the port of export of described injector is provided with power jet and connects desulfurizing tower by pipeline, described injector connects air inlet pipeline and valve.

2. the device of reduction catalysis fume desulfurizing tower loop slurry COD according to claim 1, it is characterized in that: the device of described reduction catalysis fume desulfurizing tower loop slurry COD also comprises the loop slurry circulatory system, the described loop slurry circulatory system comprises the shower nozzle being located at desulfurizing tower inner chamber top and the slurry circulating pump be positioned at outside desulfurizing tower, and the entrance point of described slurry circulating pump is connected with the bottom of desulfurizing tower by pipeline, the port of export is connected with described shower nozzle by pipeline.

3. the device of reduction catalysis fume desulfurizing tower loop slurry COD according to claim 1, is characterized in that: described desulfurizing tower connects alkali lye pipeline and alkali lye control valve.

4. the device of reduction catalysis fume desulfurizing tower loop slurry COD according to claim 2, is characterized in that: the described loop slurry circulatory system is provided with pH value in-line analyzer, and it can regulate the pH of alkali lye with alkali lye control valve coordinated signals.

5., according to the device of the arbitrary described reduction catalysis fume desulfurizing tower loop slurry COD of claim 1-4, it is characterized in that: described air inlet pipeline is provided with gate valve and check-valves.