It's true that it is difficult for you to get a China visa(https://www.travelchinaguide.com/embassy/visa.htm), if you want to get a Business Visa in China, you have to have a cooperative company which can obtain the Visa Notification Form issued by an authorized Chinese government and send you an invitation letter, otherwise, it is impossible for you get the business visa. China embassy in Nigeria doesn't issue individual tourist visa to Nigerians, you have to join a tour group and get a group tourist visa to China. If you have a relative living in China, you can apply for individual tourist visa to China for family visit.

I know you go to China to buy kitchen utensils, but there are no other method for you to get a visa to China.