Products
Large Temp. Difference Heat Exchange Absorption Unit
Working Principle
Large temp. difference heat exchange absorption unit takes the high temperature hot water of the primary heat network as the driving heat source. Like LiBr absorption heat pump, it takes water as the refrigerant and LiBr solution as the absorbent to realize the operation, extracts the heat in return water of the primary network, and uses it for the heat supply of the secondary network to reduce the primary network return temperature, and realizes the large temp. difference of heat supply of the primary network. Large temp. difference absorption unit, consists of generator, condenser, evaporator, absorber, solution heat exchanger, hot water heat exchanger, refrigerant pump, generator pump, automatic control system and so on. The refrigerant water boils and evaporates in the low-pressure evaporator, absorbs the heat of the primary network return water in the heat exchanger tube of evaporator, and lowers the primary network return water temperature. The refrigerant vapor produced in the evaporator is absorbed by the concentrated solution in absorber, and transfers the heat to hot water in the secondary network in absorber, and raises the temperature of the hot water in secondary network. The concentrated solution in absorber get diluted after absorbing refrigerant vapor, then it’s delivered to generator by generator pump, and heated by primary network high temperature hot water in generator, then refrigerant steam is generated and diluted solution is concentrated. High-temperature refrigerant steam enters condenser, continues to heat the secondary network hot water, increase the secondary network hot water temperature further, then it’s condensed into liquid state, flows to evaporator through a throttle, continue to evaporate and absorb the heat. The concentrated solution in generator enters absorber after concentration to continue absorbing the refrigerant vapor from evaporator, realizing the LiBr absorption heat pump cycle. The hot water from the primary network enters generator, hot water heat exchanger and evaporator in series, releasing heat in three stages. The secondary network hot water enters heat pump and hot water heat exchanger in parallel.
Process Flow Diagram
In the district heating system, large temp. difference heat exchange absorption unit can replace conventional water-water heat exchanger in heating station, primary network return water temperature can be reduced to a lower temperature than the secondary network return water. The primary network return water temperature is greatly reduced, increasing the Delta T between the primary network supply and return water, without increasing the investment in pipeline network and power consumption of circulating water pumps, improving the primary network heating transfer capacity. At the same time, the lower primary network return water temperature is preferable to recycle the condensate waste heat of the power plant, realizing the energy utilization of energy laddering, effectively reducing the turbine outlet back pressure. With the same steam consumption, it can increase the turbine power output, improve the turbine operation efficiency and the system energy utilization efficiency.
Adopting large Delta T heat exchange technology can significantly improve the transfer capacity of existing pipeline by increasing the Delta T between the supply/return water of the primary network. General speaking, it is a kind of high-efficiency heat exchanger based on LiBr absorption heat pump, with functions that traditional heat exchangers are not equipped with. It makes full use of the thermal potential energy of high-temperature hot water in the primary network and greatly improves the utilization rate of energy.
Fully-automatic control functions
The control system (AI, V5.0) is featured by powerful and complete functions, such as one-key start up/ shutdown, timing on/off, mature safety protection system, multiple automatic adjustment, system interlock, expert system, human machine dialogue(multi languages), building automation interfaces, easy operation, stable performance, high operating efficiency and etc.
Complete unit abnormality self-diagnosis and protection function.
The control system (AI, V5.0) features 34 abnormality self-diagnosis & protection functions. Automatic steps will be taken by system according to level of an abnormality. This is intended to prevent accidents, minimize human labor and ensures a sustained, safe and stable operation of unit.
Unique load adjustment function
The control system (AI, V5.0) has a unique load adjustment function, which enables automatic adjustment of unit output according to actual load. This function not only helps to reduce startup/shutdown time and dilution time, but also contributes to less idle work and energy consumption.
Unique solution circulation volume control technology
The control system (AI, V5.0) employs an innovative ternary control technology to adjust circulated solution volume. Meanwhile, an advanced frequency–variable control technology is applied to solution pump to enable unit to achieve an optimal circulated solution volume. This technology improves operating efficiency and reduces start-up time and energy consumption.
Solution concentration control technology
The control system (AI, V5.0) uses a unique concentration control technology to enable real-time monitoring/control of concentration and volume of concentrated solution as well as heat source input. This system can maintain unit under safe and stable at high concentration condition, improve unit operating efficiency and prevent crystallization.
Intelligent automatic air extraction function
The control system (AI, V5.0) can realize real-time monitoring of vacuum condition and purge out the non-condensable air automatically.
Unique dilution stop control technology
This control system (AI, V5.0) can control operation time of different pumps required for dilution operation, according to concentrated solution concentration, ambient temperature and remaining refrigerant water volume. Therefore, an optimal concentration can be maintained for the chiller after shutdown. Crystallization is precluded and chiller re-start time is shortened.
Working parameter management system
Through interface of this control system (AI, V5.0), operator can perform any of following operations for 12 critical parameters relating to chiller performance: real-time display, correction, setting. Records can be kept for historical operation events.
Unit fault management system
If any prompt of occasional fault is displayed on operation interface, this control system(AI, V5.0) can locate and detail fault, propose a solution or trouble shooting guidance. Classification and statistical analyses of historical faults can be conducted to facilitate maintenance service provided by operators.
Remote Operation & Maintenance System
Deepblue Remote Monitoring Center collects the data of the units distributed by Deepblue around the world. Through the classification, statistics, and analysis of real-time data, it displays in the form of reports, curves, and histograms to achieve an overall overview of equipment operating status and fault information control. Through a series of collection, calculation, control, alarm, early warning, equipment ledger, equipment operation and maintenance information and other functions, as well as customized special analysis and display functions, the remote operation, maintenance, and management needs of the unit are finally realized. The authorized client can browse the WEB or APP, which is convenient and fast.
Improve the heat energy transfer capacity of the primary pipeline while remaining it unchanged.
Reduce the initial investment cost of the new primary pipeline.
Reduce the transfer energy consumption of the primary pipeline and reduce the heat loss.
Reduce the return water temperature of the primary pipeline to create favorable conditions for efficient recovery of waste heat.
