Probably not, the pin configuration of a 30A dryer plug should be different from a 15 or 20A A/C plug. The demand draw of a dryer is higher than that a A/C unit and would trip the 15 or 20A breaker. By putting a bigger breaker on the A/C circuit would not be a good idea either because the wire size to the A/C plug would then be under sized.
No, the two receptacles can be installed side by side.
Nominal residential voltage is 120/240 volts. Not sure from you description if the plug is just rated at 230 volts or is supplying 230 volts (It is likely that the plug may be rated at 230 volts, but only operating at 120 volts). A typical hand held hair dryer would operate on 120 volts. A commercial hair dryer might operate at 220 volts, but must be plugged into a 220 supply.
Need to know what type of dryer.
No, it is more difficult than installing a new plug. You cannot reuse the wire, it must be a dedicated circuit, you will need a new outlet, and you will need a new breaker. Install a new plug.
For a 220 dryer installation, a wire size of 10 gauge is typically recommended.
Is there a dryer hookup plug in your laundry room?
Different plugs are designed so that you can't plug an appliance into the wrong voltage. A dryer is usually 220-240 Volts and your standard outlet is 110-120 Volts. You can't do what you suggest.
my aircondition is 13000 btu on 220 volt ac is how many watts
To replace the changing plug on your dryer, first unplug the dryer from the power source. Then, remove the old plug by cutting the wires and stripping the insulation. Connect the new plug by matching the wire colors and securing them with wire nuts. Finally, test the dryer to ensure the new plug is working properly.
A dryer requires a 30 amp receptacle. This will be to receive a four blade dryer plug. The wire needed will be a three copper wire #10 cable set with a bare #14 copper ground wire. The breaker will be a two pole 30 amp breaker.
For a dryer that requires a 220 wire connection, a 10-gauge wire with four conductors should be used.
A step down converter will convert the voltage from 220/230 volts to 110 volts. Converters are labeled to display their capabilities, such as "110V to 220V Converter". Read the instruction manual for your Clothes Dryer and sketch the plug. You'll want to know the voltage of the clothes dryer --- it'll likely be 220 V. You need to visit a major appliance dealer and ask to buy a step down converter after discussing the plug type and voltage found in the owner's manual.