New Mexican Spam Soup

1 (12 ounce) can Spam Lite, chopped fine
1/2 cup chopped onion
1/2 cup chopped celery
2 cloves garlic, chopped fine
2 cans chicken broth
1 (32 ounce) can refried beans
2 chopped green chiles
1/2 teaspoon chili powder

In a pan, saut