34results about How to "For the purpose of energy saving and emission reduction" patented technology

The invention discloses a totally chlorine-free bleaching method of bamboo pulp for producing Daqian writing and painting paper and aims to solve problem that the bamboo pulp for producing Daqian writing and painting paper in the prior art is subjected to two-stage hypochlorite bleaching, centralized pulping allows for centralized treatment of wastewater which can meet the existing emission standard of China, and still the wastewater contains dioxin and furan compounds which are discharged into the environment with the wastewater so as to badly influence the environment. The totally chlorine-free bleaching method includes the steps of oxygen delignification bleaching, peracid bleaching, and sodium hydrosulfite bleaching. By bleaching the bamboo pulp for producing the Daqian writing and painting paper, yield and strength of fiber can be guaranteed, pollution load caused by bleaching effluent can be reduced greatly, subsequent treatment is facilitated, and energy conservation and emission reduction are achieved. The pulp produced by the totally chlorine-free bleaching method can fully meet the production requirements of Daqian writing and painting paper, and advantages for sustainable development of Daqian writing and painting paper are created.

The invention relates to a method for producing propylene glycol mono-methyl ether with energy conservation, which comprises the following steps: mixing propylene epoxide, methanol and a catalyst (sodium methoxide or potassium methoxide) in a preset ratio in a static mixer; preheating to a set temperature with vapor generated by absorbing reaction heat in a preheater; heating with foreign vapor with the temperature higher than 160DEG C in a heater for pre-reaction; continuously reacting materials in a tube pass of a pressureproof tube type heat exchanger; vaporizing hot water in a shell pass with surplus heat released in the reaction; and performing the subsequent routine refining process of separation and purification on materials on the outlet of the tube pass of the tube type heat exchanger to produce the propylene glycol mono-methyl ether. The method can timely remove heat released in etherification, the heat is converted to a heat source for preheating the raw materials, and the method can produce the propylene glycol mono-methyl ether with energy conservation. The heat exchange makes the temperature rise in the reaction controlled in a narrow range, so the selectivity of generated 1-methoxy-2-propanol can be improved and the quality of the product is improved.

The invention discloses a central air-conditioner air-out system which is applied to a service hall. The central air-conditioner air-out system comprises an air-conditioner air-out device which is communicated with a central air-conditioner, the air-out device is a chair, interiors of front legs, seat surface and back of the chair are hollow cavities, a plurality of air holes are formed in the front legs, the seat surface and the front side of the back of the chair, the hollow cavities of the front legs and the seat surface form one group, the hollow cavities of the chair back and two rear legs form tee joint structures respectively and a steering switch is arranged, and the two rear legs are communicated with air outlets and air return openings of the central air-conditioner respectively through control switches. According to the central air-conditioner air-out system, the chair is used as the air-out device of the central air-conditioner of the service hall, cold air and hot air temperatures can be adjusted, when only several guests take a rest or wait in the service hall, the air outlets of the central air-conditioner of the hall can be closed, a power switch of the chair is merely required to be switched on, the guests can rapidly feel warm or cool, air-conditioning consumed energy can be saved, resources are saved, and energy saving and emission reduction can be achieved.