One option can be something like this:
for key, value in dict(model.named_parameters()).items():
    if 'the_name_of_the_conv_you_want_to_zero_out' in key:
        value.data[0, 1, 22] = 0

or, another option:
model.the_name_of_the_conv_you_want_to_zero_out.weight.data[0, 1, 22] = 0