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How to realize the electric power conversion of coal-fired power plants?

In recent years, with the development of filter cloth material manufacturing technology, the bag type dust remover has greatly improved in the strength, high temperature resistance, corrosion resistance and wear resistance of the filter cloth. Baghouse dust emission concentration may be controlled at 15 ~ 50mg / m ?, it has been widely used in power plants, mining and metallurgy, chemical industry, the cement industry. As the country's requirements for soot emission standards are getting higher and higher, for existing electrostatic precipitators, technical changes must be made to meet new emission standards.

Advantages of bag filter compared to electrostatic precipitator

Increased ventilation can be handled; filter media can be changed as process conditions change.

When used in a dry desulfurization system, the desulfurization efficiency can be appropriately increased, and the damaged filter element can be replaced at any time, and the high-efficiency operation can be ensured for a long period of time.

The bag filter can be designed as a number of individual units for online access and maintenance.

The dust removal efficiency is high, and dust of 0.3 nm or more can be collected, so that the dust-containing gas purification knife is 15 mg/m or even less, the structure is relatively simple, the operation and maintenance are convenient, and the cost and operation cost are much lower than that of the electrostatic precipitator.

Reduced maintenance, online maintenance; no precise restrictions on the nature of the inlet dust.

Retrofit of electrostatic precipitator into bag filter

1. Remove the various components inside and on the top of the electrostatic precipitator. Including plates, poles, rapping devices, upper and lower frames, rectifier transformers, perforated plates and top covers, usually leaving only one empty shell.

2. Install the dust collector inlet and outlet flue flapper valves. Some modifications may involve the transformation of the flue and the inlet and outlet of the precipitator. The amount of smoke entering each chamber should be accurately calculated, and the airflow distribution experiment should be carried out to ensure that the airflow in each chamber is relatively uniform.

3. Install a flue gas deflector and a uniform airflow device in the dust collector housing. The design of the deflector should be considered for wear protection.

4. Install the entrance door, window, walkway and escalator according to the position of the clean air chamber and the passage. The entrance door should be sealed and insulated. The window should be installed so that the dust on the outside of the dust collector can be easily seen from the outside of the dust collector.

5. Selection and installation of filter bags. The filter bag selection of the bag filter depends mainly on the amount of flue gas, flue gas temperature, smoke composition, dust characteristics, size of the precipitator, installation and use requirements and cost.

6. Install the clean air chamber and top cover. The design of the clean air chamber should be with the installation of the bag cage. The design of the top cover should consider the arrangement of the cleaning pipe and other equipment and the operation of the lifting device.

7. Install the cleaning system. The cleaning system mainly includes compressed air equipment and pipelines, pulse valves, gas storage tanks, blow pipes and related electrical components. Generally, there are 3 kinds of cleaning devices, namely, differential pressure automatic backflushing, time relay automatic cleaning and manual cleaning. According to the service life of the filter bag and dust accumulation. Even and can automatically reduce the pressure difference backflush in the fast, medium and slow 3 ways.

8. Installation of the protection system. Including bypass flue, dust collector inlet flue gas over temperature alarm and emergency cooling device. In order to avoid the boiler igniting fuel damage to the filter bag and the bypass flue is set, it involves the connection and cooperation between the boiler and the dust collector, especially when switching from the bypass flue to the dust collector body operation, the furnace negative pressure will have a larger Fluctuation requires that the furnace negative pressure automatic device be quick and flexible. Another topic is the temperature of the smoke. The temperature of most of the boilers in the country exceeds the design value, and some of the over-temperature ranges are still large. It must be controlled by running the commissioning and putting the soot blower. In addition, emergency alarms and emergency cooling devices can be added to the flue.

9. Agent instrument and control device. The high-voltage power supply in the control room of the original electric precipitator can be “please go out”, and after installation of the electric and thermal control lines, it can be installed on the bag filter plc and pc.

10. Reform the boiler dcs and operating procedures to accommodate the operation and management of the bag filter.

11. Reform the induced draft fan and motor.

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