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$DB->delete('user', 'id = 3');

Ok, try to update your delAction become like this:

  public function delAction()
  {
    $params = array('host'		=>'localhost',
	                'username'	=>'root',
					'password'  =>'admin',
					'dbname'	=>'zend'
	               );
	$DB = new Zend_Db_Adapter_Pdo_Mysql($params);
	$request = $this->getRequest();
	
    $DB->delete('user', 'id = '.$request->getParam('id'));	
	
    $this->view->assign('title','Delete Data');
	$this->view->assign('description','Deleting succes');  		  
    $this->view->assign('list',$request->getBaseURL()."/user/list");  
  
  }

Oke, now, you are ready to read more about Zend Framework query style at Zend Framework manual guide.