Can’t maintain the acid concentration?
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Our company uses a 3+2 two-turn two-absorption process for sulfuric acid production; at present, it is somewhat difficult to produce acid with a purity of 98%, as the acid concentration cannot be maintained； We use a Venturi tube for producing tap water, and a foam tower for producing wastewater; the water temperature reaches 36 degrees, which results in an inlet air temperature of 44 degrees in the drying tower. For this situation, I’m not sure what solution exists to enable the production of 98% acid properly
The problem lies in the inlet temperature of the drying tower; since it’s too high, you can install an additional cooling water circulation system. Ensuring the water temperature is necessary to reduce the inlet air temperature to the tower
1. Reduce the temperature of the gas entering the drying tower; I’m not sure what process you use, so it’s difficult to give a specific recommendation. 2. Try to increase the SO2 concentration of the gas.
It seems the purification section needs to be cleaned.
In this case, only 93 acid can be produced; at 44 degrees, 98% SO2 is required with a concentration of over 8%
Systems with low annual production under Plan 1 should use 93 drying； 2-channel Venturi tube ； 3 Check the resistance of the foam tower by observing the height of the foam layer through the sight glass ； 4 Deep well water or purified water can be considered for use after being settled in deep tanks. The above plan is for reference only.
You can add a set of plate heat exchangers; tap water passes through these exchangers to spray wastewater onto the foam tower in order to cool it down, keeping the temperature of the foam tower below 35 degrees. In this way, you can achieve a purity level of 98%.
It must be related to the water temperature
It’s obvious that the acid-water balance is off! The problem is that the heat removal for purification is insufficient. Solutions: 1. Clean and unclog the heat exchange equipment to improve the heat transfer coefficient! 2. Increase the amount of purified fresh water supplied, as well as the discharge volume (this can be used as a temporary measure; it’s a waste of water!) ) 3. Increase the flow rate of the circulating cold water, or make adjustments to the circulating water cooling tower. 4. Increase the sulfur dioxide concentration,
Reduce the inlet temperature of the dryer in order to decrease the amount of moisture carried into the dryer tower. If the cooling water volume (in the preceding purification section) is already at its maximum, considering adding a cooling tower could help lower the temperature of the water used for cooling. Of course, appropriately increasing the concentration of sulfur dioxide in the flue gas also helps to raise the acid concentration
10# 0304340428: 1. Lower the temperature of the circulating water, for example by using a cooling tower; 2. Install a cooler after the foam tower; 3. Equip the dilute acid fed into the foam tower with a plate heat exchanger