Spray valve control system of spray tower

Abstract

The invention relates to a spray valve control system of a spray tower. The spray valve control system of the spray tower comprises a water spraying electromagnetic valve, a gas spraying electromagnetic valve, a booster pump, a pressure gauge, a flow meter, an automatic regulating valve and a programmable logic controller (PLC), wherein at least two groups of electromagnetic valves (11, 12) whichare controlled by the PLC control water spraying and gas spraying; and a circulation control module is designed in the PLC to make each group of electromagnetic valves (11, 12) serve as the first group of valves sequentially to control the operation of spray valves. The system can send out an instruction automatically according to a preset time value to indicate that the electromagnetic valves control each spray valve to operate alternately for spraying and cooling, so that over-corrosion of the spray valve on a side and the wall of the spray tower is avoided; moreover, the PLC can change theratio of a water pressure to a gas pressure automatically, so that an atomization effect is better.

Description

1. Technical field [0001] The invention belongs to the field of automatic control desulfurization and dust-proof equipment, and in particular relates to a spray valve control system of a spray tower. 2. Background technology [0002] The existing spray and atomization device includes water spray solenoid valve, air spray solenoid valve, booster pump, pressure gauge, flow meter, and automatic regulating valve. When the temperature of the flue gas exceeds the set value, the PLC controller will issue an opening after receiving the instruction. The information of the first group of water spray valves and air spray valves, the solenoid valves are turned on to start spraying, to achieve cooling effect, the six solenoid valves are divided into three groups, distributed in an equilateral triangle, when the flue gas temperature reaches 130 degrees, open One group of solenoid valves, when the temperature reaches 150 degrees, open the second group of solenoid valves, and when the tempe...

AI Technical Summary

Problems solved by technology

The existing control technology has the following disadvantages: 1. The roasting temperature is generally 140 to 160 degrees. The first group of valves takes the most time to open, while the other two groups of valves basically do not open. The spraying is disabled for a long time, and it is easy to block after corrosion. Nozzle; 2. The roasting flue gas contains sulfur. After atomization, it will form a weak acid with the flue gas, and the pH value is less than 4. This kind of acid mist is easy to cause corrosion of the spray tower wall, and the first group of valves has the longest opening time. , the acid mist generated on this side is the most, and the tower wall near the first group of spray solenoid valves is extremely corroded. The actual situation is that after the first group of solenoid valves has been perforated, the opposite tower wall is still 10mm thick, basically uncorroded; 3. The ratio of water pressure and air pressure cannot be changed in the existing control instructions, and the best effect of atomization cannot be achieved. After excessive water spraying, acidic liquid will be formed at the bottom of the spray tower, which will cause great corrosion to the bottom of the spray tower. If it is not enough, it will not be able to cool the flue gas; 4. Based on the emergency consideration of power failure, the original design of the solenoid valve is a normally open valve.

Images