Air compressor (referred to as air compressor is the most widely used power source in the industrial field and is widely used in mechanical manufacturing and other places where compressed gas is required. The air compressor mixture of the air compressor is higher in temperature, if the heat is not timely Discharge will cause serious damage to the equipment and affect the gas production efficiency. Therefore, recycling the waste heat generated by the air compressor can not only maximize energy recovery, reduce energy consumption, but also improve the gas production efficiency of the air compressor. Extend the life of the equipment.
The company is a cigarette manufacturing factory. The production of wire and package equipment requires a lot of high-pressure air. The standard air pressure is 0.7MPa. The factory active workshop is equipped with 4 Atlascopco oil-free screw air compressors, including ZR200 (power 2OCMO02, ZR160VSD ( Power 160001 units, ZR250VSD (power 250K for 1 production period requires 2 ZR200 units or 1 ZR200 and 1 ZR250VSD operation to ensure production supply (the following calculation is based on 2 air compressors per hour recoverable power 318KW calculation to ensure air pressure The normal operation of the machine, the air compressor unit uses water cooling to discharge the heat of the compressor to the outdoor environment, resulting in a great waste of energy. Through the transformation of the compressor, the heat of compression is recovered in the form of hot water; for Atlas. For Ke oil-free screw compressors, the energy recovery efficiency is up to 90%; for inverter compressors, the recovery energy is linearly proportional to the rotational speed; from the investment cost structure analysis, the energy-saving center of gravity of the compressor is based on energy consumption. For motor-driven compressors, the energy consumption can be approximately equal to the power consumption. 1 Air compressor heat recovery analysis Air compressor air passes through the second stage high pressure The compression can reach a temperature of 180-190. After cooling, the compressed air temperature is generally controlled at 40-45 to enter the dryer to dry. The input power of the air compressor is about 90%. The shaft power is used as heat through the cooling. Carrying away, 2 air compressor system consumption in the environment analysis and recycling heat calculation 2.1 Air compressor system operation status Air compressor model rated power (KW) load ratio running time (hour / day) operating days (days / Year) Remarks 2 sets 1 set plus 1 set Description: 1. The average production period of the air compressor is: one ZR200 full load, one ZR250VSD average load 70%; 2, winter heating period is 150 days, air compressor The running time is 120 days; the production running period is 120 days in other seasons; 3. The following calculations mean that the air compressor runs an average of 20 hours per day (20h) during the production period.
Comprehensive application of heating system backwater auxiliary heating, integrated station bathing hot water, etc. After the heating of the bathing tank is completed, all the heat is used for heating applications. According to the actual utilization rate of the air compressor, the energy of the air compressor can be used per hour: feOOKw 12.1 Heating system backwater auxiliary heating application analysis The factory winter heating system water supply temperature control is about 65T, and the return water temperature is about 5CTC. After the heat energy recovery of the air compressor, the temperature of the heating and returning water is higher than 65T. After the heat exchanger is returned to the water temperature lower than 35, the daily heat recovery water is 181.68 tons. Calculation formula and value: ton (65-5() = 159.42KWh.I Application heating area is converted to: 159.42/0.12=1328.5 square meters. (According to the heating standard, the heating value of steam according to 120W/M2 is calculated. For: 2520 MJ/ton, the thermal efficiency of steam is 80%, and the steam is saved by 5.7 tons per day. The whole winter is steam-saving 684 tons. 12.2 employees bathing hot water heating application tap water winter temperature is about 8T, need to be heated to 45T For the workers to take a bath, the average number of bathers is 300 people/day, and the water consumption per person is calculated as 60 liters.
The calorie required to meet the bathing capacity of 300 people per day is: 300*0.06t* The average energy consumption per hour of air compressor consumption is 38Kw, that is, the total energy saved by using air compressor heat energy recovery for hot water for winter bathing is 91200Kwh, which is equivalent. At 328,320 MJ.
Stomach winter bath uses heat energy recovery to save steam: 162 tons of 2.3 in addition to winter, the rest of the season, the application of comprehensive station room bath with hot water, softened water heating and other comprehensive applications.
31 bathing field 7 (13.2 softening water heating application according to the actual starting power can recover energy per hour: 318Kwh, hot water for bath use 31Kw.h. The remaining air compressor heat recovery energy is 287Kw per hour for soft water heating The heating application is limited by the efficiency of the air compressor entering and leaving the cooling system. The optimum temperature rise requirement is 10U. Therefore, the rest of the heat is discharged to the outside by the auxiliary cooling system. It cannot be fully applied. According to the softening water of our factory, the average use of 20 tons per hour is The hourly available air compressor heat energy is 200Mcal. The equivalent energy is 233Kw.h, which is equivalent to 838.8MJ in the 120-day production period of the season amine. The total energy-saving energy can be recovered by using air compressor heat energy recovery: 2013120 trillion Coke, that is, in other seasons, heat will be recovered for heating and softening water. Steam is saved: 998 tons of other seasons will be recycled heat for bathing, heating and softening water is converted to save steam: 135+ annual cost savings: according to the actual average consumption of our boiler Oil production and steam ratio: 1:15 (tonnes of diesel / ton of steam) conversion, annual recovery of thermal energy to reduce diesel consumption is 131.9 tons, calculated according to diesel 8,000 yuan / ton, can save 105.5 Ten thousand yuan.
In addition, the cold Sj supplement water can be greatly reduced in summer, according to the average daily reduction of 30f replenishment, 4.5 yuan per ton of water, can save 30x150x4.5=20250 yuan per year for 150 days of air compressor heat recovery. Air compressor heat application + cooling water reduction = 105 + 2 = 1.70 million yuan 3 air compressor heat energy recovery energy saving solution Technology innovation for the application of 10KV distribution network in electrical design Zhu Juqing (Jiangsu Nanrui Taishida Electric Co., Ltd. Company, Taizhou, Jiangsu 225300, China) A management system, the power grid system is the guarantee of national industrial production, agricultural production, and the people's life safety and property safety. It is the lifeline and pillar of the development of the national economy and promotes the sound development of the national economy. The distribution network is a vital link in the power system for transmission, power generation, substation, and electricity and distribution, and distributes the power of the entire power system. The distribution network has a wide coverage area, many distribution points and frequent changes. According to these characteristics, the article analyzes and studies the application of distribution network.
At present, the distribution network management automation methods applied in some areas of China mainly include: setting the key matching switch of branch and demarcation at the user access end, ensuring that the user's normal power demand on the power and main line is at 10kv. The method of using the recloser and the segmenter on the radiating and tree lines is to set up a backup power supply and three main power supply in the 10kv ring cable distribution network to realize the above-mentioned distribution methods of the automatic distribution electrical design. Further improvement, improvement and optimization to form more ring networks, complete each household can realize two or more power supply automation distribution network systems, generally under multiple monitoring and monitoring A control center also has a number of terminal combinations to form an automated distribution network management complexity and comprehensiveness, mainly including the distribution system and related power enterprises for the management and control of functional data six. The purpose of automated distribution network management is Combine network technology and communication technology with power equipment and corresponding electronic equipment, under normal circumstances or In the situation, the combination of control, measurement, detection and protection of the power supply industry for the overall distribution network to effectively improve the quality of power supply, to achieve close contact between users, to meet the different needs of users, to achieve The most fundamental purpose of automation of electrical network management is to maximize the power supply economy. 2 In the case of planning and design of the distribution network grid, the ring network should be connected to the trunk line to ensure better wire load and equipment. Transfer the various needs, increase the utilization of the wire, and ensure that the different lines can also be connected to each other. In the planning process, the distribution of the distribution network power supply and the distribution network power supply capacity should be properly allocated, and determine the grid of the 10kv distribution network. The early planning direction and form ensure that the planning and design of the distribution network frame does not conflict with the actual local power grid, and the distribution is reasonable. At the same time, the main trunk lines and main feeder lines of the distribution network can also be interconnected in order to provide users with quality. Power supply reliability and safety, to segment the main line of the distribution network, while ensuring the amount of segmentation
3 10kv distribution network automation system application research In order to realize the detection and control of the ring network cabinet, column switch, overhead line, cable line and opening and closing station of the whole 10kv substation, the dispatcher can realize the complete application of automation system. The most important application of the grid system is the busy tuning of the distribution network.
4 Exploration and application of new technologies in 10kv distribution network In order to facilitate the perfect cooperation between distribution network equipment, graphics and production management, power distribution is based on a geographical background, system platform in distribution network On-the-spot management of distribution network equipment and graphics processing, so as to more effectively enable the normal operation and operation of various equipments for the later maintenance, overhaul and exit full set of links management 5 10kv distribution network control line loss Application research of the four-point system In the grid, the control of the line loss and the distribution area in the 10kv line is the control of the line loss and the key factor is the application and management to realize the line loss of the distribution network. Effective management, this is a rather difficult task to provide a suitable management platform for the entire distribution network. The line loss of the distribution network is the 10kv mid-line data of the distribution network and the negative-space system for the distribution area. The energy collection system and the distribution network automation system are used to implement the collection project, and then the collected data is periodically uploaded to the line loss quadrant platform, and the line loss quadrant platform is uploaded. According to the analysis and processing, the staff can get a fairly standard line loss value. According to the final line loss value, the staff can have a deeper understanding and understanding of the line loss of different platforms and different lines, so that the emergency can be controlled in a timely and effective manner. The problem of applying the distribution network line loss quadruple system can not only make a more accurate judgment on the distribution network line loss, but also can unify the station time and user list, so as to implement dynamic management for the change meter and new addition, and It can maintain terminal data more effectively and improve data accuracy.
6 Design and Construction Principles of the Grid Grid In the process of designing and constructing the distribution network, it is necessary to pay attention to the following requirements: in order to effectively share resources, set up a local 10kv distribution network information management network to understand the local power. Features, research and deal with the branch box, path size, process requirements and mechanical equipment required for cable and overhead lines, and improve related power distribution regulations, strengthen management of 10kv distribution network. Regularly study and study the experiences and lessons learned in the process of constructing the distribution network in the past, focus on the problems arising in the operation and maintenance of the 10kv distribution network, make a summary and make corresponding treatment plans.
10kv with I network as a direct connection user in the entire power industry system to face customer applications is a powerful challenge and backbone in the entire power industry distribution system, playing a vital role in maintaining power stability and grid security issues At the same time, under the general trend of power system reform, from the technical level, the application of advanced equipment to ensure the safe and stable operation of the distribution network, from the management level, the use of scientific management theory to enhance the reliable supply of power distribution network. Sexuality, deepening the development of the power industry.
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