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In the new round of enterprise technology transformation, the enterprise leaders and technical departments will focus on the selection of concentrating equipment, because the concentrating equipment vapor consumption generally accounts for about 70% of the enterprise. The low carbon economy is forcing every business leader to face the threat of excessively levied taxes. Choosing energy-efficient concentrating equipment is a multiplier.
1. How to choose a concentration device 1.1 Concentration equipment has single-effect, double-effect, multi-effect, steam heat pump double effect and mechanical heat pump concentration (MVR).
Single effect is mainly used in small batches, heat sensitive varieties or paste collection processes. At present, companies generally use double-effect concentrators. Everyone knows that double-effect concentration is more energy-efficient than single-effect, because double-effect II does not require boiler steam, and it uses I-effect secondary steam as a heat source. Evaporation of 1t water, 1.71t steam for single effect, 0.6t steam for double effect, 0.4t steam for three effects ------, multi-effect energy saving, but low overall efficiency, troublesome operation and cleaning, And the more effective the first effect temperature is higher. Therefore, double-effect enrichment is currently widely used in China. Let us introduce the energy-saving principle of the heat pump double-effect concentrator that is more energy-efficient than the double-effect concentrator.
1.2 The heat pump double-effect I-effect heater gives the II effect in addition to half of the secondary steam, and the other half returns to the I-effect heater through the suction of the Laval nozzle, that is to say, the I effect of the heat pump double-effect concentrator Half of the secondary steam is reused by itself, so it saves 1/3 of the steam compared to the double effect. In theory, the heat pump double-effect concentrator only needs 0.35t of steam to evaporate 1t of water, so it is more energy efficient than the double-effect concentrator.
1.3 There is also a more energy-efficient mechanical heat pump concentration (MVR) than the heat pump double-effect concentrator. Its primary energy utilization rate is high, but the economic benefit is also determined by the price of electricity and coal. China's current electricity coal ratio is high, in practical applications. Its economic benefits are not ideal, and its shortcomings are also very obvious:
1. Affected by various factors, such as solution viscosity, multi-foaming and boiling point increase factors will reduce the utilization rate;
2. The investment is large, the maintenance is large, and the maintenance cost is high.
3. The temperature of the whole process of concentration is more than 90 degrees, which has a great impact on the quality of the drug, especially the heat-sensitive drugs are not suitable.
1.4 Comprehensive consideration of heat pump double-effect concentrator is currently the domestic cost-effective energy-saving concentration equipment.
2. How to choose the matching condenser 2.1 The vacuum concentration process consumes a lot of electricity in addition to a large amount of steam. Pipeline condensers and water ring pumps are commonly used, some use mixers, and some directly use water jet pumps. The method of using the water jet pump consumes a large amount of energy because the required water pressure and water volume are large. At present, no matter which method is used, a large amount of hot water will be replaced. These hot waters need to be cooled by cooling towers, pools, circulating pumps, etc., and the energy consumption is very large. What kind of cooling system is saving energy?
First analyze why the vacuum concentration process requires a large amount of cooling water? When the secondary steam condenses, it will quickly release a huge latent heat of vaporization. The heat of vaporizing latent heat is dozens of times of sensible heat energy. What is the latent heat of vaporization and sensible heat, a simple definition: the heat absorbed by a unit mass of liquid converted to a vapor of the same temperature is called latent heat of vaporization; the heat required for temperature rise and fall without phase change is called sensible heat. If you look up the table, you can see that the secondary steam of 1kg 60°C should absorb the latent heat of vaporization from the sensible heat of 56kg of 35°C cooling water. Only the latent heat of vaporization of the secondary steam can be absorbed to turn it into condensed water. The heat rise is sensible heat, so that a large amount of cooling water is required for the concentration process.
2.2 How can I reduce the amount of cooling water used in the concentration process?
It is well known that the secondary steam generated by the front-concentration of multi-effect concentration is a heat source concentrated later, and the latter heater is actually a front-concentrated cooler, and the secondary steam that needs to be cooled is only twice produced by a concentration tank after zui. steam. Therefore, the double-effect cooling water is less than the single-effect, and the double-effect concentrator only needs the second-effect low-temperature secondary steam to be condensed, so the double-effect saves a large amount of cooling water than the single-effect. The secondary steam of the II effect of the heat pump double-effect concentrator needs only about 2/3 of the double-effect concentrator, so the heat pump double-effect concentrator requires less cooling water. According to the amount of secondary steam that needs to be cooled after single-effect, ordinary double-effect and ordinary heat pump double-effect, the evaporation amount is 1000L, and the amount of cooling water required by them is about 56t, 28t, 20t respectively.
From the above conclusions, it can be analyzed that the energy consumption of the same type of vacuum concentration cooling system depends mainly on the amount of secondary steam that needs to be cooled. However, no matter what kind of traditional condensation is the way to use sensible heat to absorb latent heat, ant big corps tactics.
Precautions for selecting concentrated equipment and supporting technical equipment
How to improve the efficiency of pharmaceutical equipment, save the consumption of equipment in the work process, and reduce the pollution emissions of pharmaceutical companies to the external environment, is currently a topic of common concern for pharmaceutical equipment companies, pharmaceutical companies, government departments and so on. In the forthcoming pharmaceutical industry's "Twelfth Five-Year Plan", it is also pointed out that the "Twelfth Five-Year Plan" will achieve results in energy conservation and emission reduction. It is foreseeable that during the “Twelfth Five-Year Plan†period, a new round of pharmaceutical plant energy conservation and emission reduction will be ushered in.