【 Weak current College 】 beer system how refrigeration energy efficiency

Summary: our country has been promoted socio-economical, energy consumption becomes a social focus. Author in the actual work involved some beer refrigeration system, summarized some current in beer refrigeration system on the application of the broader energy-saving technology, want to be able to play a greater role, so that colleagues in beer refrigeration system design can be used for reference, as China's beer beer industry energy-saving technology more made some constructive suggestions.
Keywords: beer, energy saving, refrigeration
I. preface
Saving resources, is the current and future quite a long period of China's economic and social development must confront and solve a major issue. In order to promote the excellent development of economy and society, we need to carefully analyze the situation of energy-saving, and actively explore new avenues and energy saving.
Moon as the pacesetters in the refrigeration industry, but also actively explore the analysis of energy-saving way. The author has been in the Moon is responsible for the refrigeration system in the beer industry, presided over the design of a large number of beer refrigeration system, from which the summarized some energy-saving technologies, and colleagues to share and discuss together.
Second, content
1. choose the volume ratio adjustable compressor group
We all know, in brewing technology, evaporating temperature Basic is constant, but the condensing pressure will follow changes in temperature between the 0.7 ~ 1.4MPa fluctuations, external pressure ratio will continuously change; and the compressor only, pressure ratio and external pressure ratio consistent you can play a maximum cooling efficiency. Therefore, the selection of the host in the refrigeration, in as far as possible, adopt internal ratio automatic adjustable screw compressor unit, so as to ensure the system is running inside and outside pressure remains more or less equal, avoiding the extra energy loss, the compressor has always maintained a high cooling efficiency and saves energy.
2, System consolidation, refrigerator full load operation
Beer production process with cold demand is intermittent, yields are low and peak seasons, while the compressor is running under the full load condition is the highest efficiency. At the peak of production requires three compressors run at the same time (only for example), while the yield in a slump, a compressor may not reach full capacity. Therefore according to the characteristics of cold beer factory production, in the design of refrigeration system, it is necessary to consider different load conditions, to minimize the number of compressor to run, try to keep the compressor in full load condition run, play their maximum efficiency. In system design, we on refrigeration system should appropriately combined, and in different evaporating temperature systems provide the bridge between the compressor to ensure different load situations with the flexibility to deploy refrigeration compressor on, reducing the number of compressor to enable, enhance the efficiency of the compressor.
3. using ammonia liquid cooling directly
Ammonia liquid cooling directly than refrigerant indirect cooling more energy efficient. Now many new brewery, fermentation tank's cooling has past mining of refrigerant indirect cooling change became now the ammonia liquid cooling directly.
4. application of cool technology
Cool technology as an important energy utilization technology, from ancient times to the present are people of all ages, the winter ice storage up to the summer then use; saccharification of ice water systems, ice water for intermittent use. So as long as the system sets a volume sufficient ice tank, use during night-time electricity price trough to the storage, preparation of ice water for daytime use, therefore the day not ice water or less ice water will still be able to meet production needs. On the one hand on the power used to move to the "peak" effect, save operating costs; on the other hand the night environment temperature and more beneficial to the refrigeration unit operation, improve the efficiency of refrigeration systems.
5. water pump adopts frequency conversion technology
If fermentation tanks used refrigerant indirect cooling, the refrigerant pump best adopts frequency conversion technology. Because the fermentation tank temperature in different time periods under the control of the temperature point requires a refrigerant flow is different; the pump energy cannot be separated from the operating point of reasonable adjustment. The regulation are the following two types: one is the characteristic curve of the pipeline, such as closing valve regulation, but will be a loss of power water pumps, and a water pump performance curve of the regulation, such as the water pump impeller speed, cutting, etc. In energy-saving effect, change the water pump performance curve of the method, change the line characteristic curve is much more to be significant. Therefore, change the water pump performance curve of becoming a primary means of pumping energy saving. The frequency change the pump performance curve, and automatic control of obvious advantages, the application is very extensive.
6, refrigeration system of automatic control
Refrigeration systems for automatic control, can stabilize the product quality, beer tasting notes, save energy, reduce production costs, reduce the labor intensity of operation, etc. As the domestic refrigeration industry technology development, refrigeration system for fully automatic control is already a mature industrial technology. At present, most of the new beer plant using the automatic control mode.
Beer industry refrigeration system design of the general idea for automatic control, run time with manual and automatic selection of two control modes. Automatic control mode is determined by the system PLC system overall coordination of the control, the device (refrigeration units, evaporative condensers, ice water cooler, ammonia separation plate heat exchanger unit, etc.) according to regulation for its own operation parameters, while system with communication interface, you can run the status information to the public project monitoring center in monitoring center shows the status and implementation and stopping control.
Control system of monitoring using PLC, host using a computer running the configuration software of the IPC, the position of bits through network connections. Each ammonia screw compressor can, without prejudice to any other peripheral equipment of the refrigeration unit for status display, working set, parameters to modify individual control, i.e., slave, between upper and lower computer between interference will not occur, since a separate system, or you can field bus data is connected to the PC, in response to the host computer's instruction and monitoring.
Evaporative condenser layout according to the system air pressureAbility to automatically determine the evaporative cooling water pump's opening number. First of all evaporative cooling of exhaust pressure detection system, and then compared with the set value, to determine the evaporative cooler's opening number, in order to maintain the exhaust pressure is set to normal range.
7, system settings automatic air separator
In the refrigeration system, the presence of air in the normal operation of the system has a great effect that makes it possible for a system of condensing pressure rise, increasing energy consumption of the compressor, the increase in the cost of running the system. Especially during the hot summer air presence even potentially allows condensation pressure too high, the system may not function properly.
System settings one can automatically run and unbroken will not-Condensable Gas separation from the refrigeration system and exhaust system of multiple point automatic air separator device, reducing condensation pressure refrigeration system, maintenance system in the most economical operation of the State has played a vital role.
8. Select high-efficiency heat exchangers, heat transfer efficiency
Heat exchanger for heat transfer efficiency is the impact of the refrigeration system operation efficiency. Saccharification line system in ice water preparation should select the plate heat exchanger, on the one hand, taking into account the ice water is added to the raw water brewhouses, to ensure water quality; on the other hand can improve evaporating temperature, increase the cooling efficiency. Fermentation system refrigerant can be used for production of plate heat exchanger or evaporator; elected by the evaporator, should use high efficiency siphon the evaporator, the evaporator heat transfer area than ordinary full fluid evaporator area significantly reduce, but efficiency is higher, lower factory equipment costs, reduce equipment investment costs.
III. concluding remarks
Energy-efficient technology will be the refrigeration system is an eternal topic. Along with the rapid development of the beer industry, its energy consumption in cooling. This article is the author of the project design, in brewing for years in a successful experience, hope colleagues together to focus on energy, research, in brewing refrigeration system energy efficiency and make new contributions to the field.