【 Weak current College 】 high airtight condensed water recycling technology analysis---Power By 【 China power house network 】

First, the problem in many factories are steam as heating source to complete all kinds of heating process. Steam in the steam release of latent heat of vaporization equipment into the same temperature and pressure of the saturated condensate water. How to handle and use these condensed water, they must face an important topic. 1. the recovery system situation 1.1 steam equipment emissions of condensation water, near-saturated steam pressure of cooling water (more than 100 ° c or above), using ordinary water pump delivery, if not a bit poor conditions that will generate cavitation damage water pump is not working properly. 1.2 high temperature will be saturated condensate discharge away or wait for recovery after cooling, the thermal environmental pollution and energy waste. more steam device does not install trap, or trap-selection of properly, leakage, resulting in some steam vertical. environmental heat pollution and energy waste even more serious. 2. collection methods 2.1 open-recycling: the water temperature drops to normal pump does not produce steam temperature of 75 ° c, saturated condensate in the second Flash at atmospheric pressure, resulting in a large number of latent heat loss, less than 60% of energy utilization. At the same time, due to the condensation water and the atmosphere exposures, lost original softening water quality conditions after processing. 2.2 closed recycling: recycling system is not in contact with air, reduce run, run, drip, leak of heat loss and heat pollution, condensed water recycling temperature up to 100 degrees centigrade above; the cost-saving and water treatment. Energy-saving rate is as high as 20%. Therefore closed recycling method will become a condensate recovery work in the main method. Second, the enterprises are facing waste 1. Steam condensation water run, run, drip, leak, fog, winter, hot summer heat pushes me, causing thermal pollution, possibly burn field operatives. 2. peak steam boiler output when obviously feel inadequate, to use an alternate boiler, resulting in wasted investment and operation. 3. sometimes the steam equipment almost "rectum," the potential risk of steam, the steam no good use. 4. open the condensate pump cavitation occurs because you cannot use the heat loss of up to 20%. 5. as a result of condensation water no recovery for boiler makeup water, water handling capacity of the high cost of large-. 6. furnace, boiler scaling needs regular sewage, waste heat of the deficiencies. 7. boiler clean production, black smoke unsanitary. 3. recycling technology solution 1. Full steam equipment heat load survey steam equipment of thermal load is often muddled data, the resulting steam distribution system design, selection, recycling, water supply network design is not accurate. Cause the device to complete the same heating process, excessive consumption of steam and produce steam resistance, water hammer, etc. Thermal system experts through the steam equipment heat load of detailed investigations completed — from the boiler steam pipeline — steam equipment-water system (water) — recycling network-recovery pump station-boiler heating circulation system by careful design, guaranteed thermal system closer to the perfect energy cascade use degree. 2. the heating system matching criteria selection device under steam trap traps selection criteria of the original, and some by the Institute under the open-type design recovery method, resulting in a closed recycling technology, the net pressure decrease, decline; the water displacement of enterprises according to steam equipment drainage pipe diameter own configuration, not in accordance with the pressure and displacement select dredge water valve discharge diameter, resulting in a steam trap displacement is too large or too small, leakage or open-prodigality by-pass pipe. Thermal system experts under closed thermodynamic cycle condition of differential pressure and displacement parameters, taking into account heat exchanger with steam trap type to select, to achieve the most reasonable system match. 3. set the water points and device application set water points of consideration should be given to the steam device convergence, device used steam pressure relative consistency and ease of management, with the relative concentration of steam equipment, equipment for steam pressure relatively consistent (differential pressure within 0.15MPa) and management of convenience can be set to the same collection points. Recovery point using high temperature condensed water vapor pressure recovery unit or Armstrong condensate recovery, automatic pump or the company's steam Sara g steam pump for closed recycling of steam condensate and pressurizes and recovery network. High temperature condensation steam pressure recovery unit most new condensate recovery conveying equipment, electronic control systems rely on water level sensor for sensing elements, from the simple and reliable door circuit driving relay control two alternating electromagnetic valve open and close form an automatic work the system to complete automatic backwater. The device has adjustable thermostatic valve, it can use hot equipment constant temperature control, on the availability of high-temperature medium for throttling to prevent leakage due to steam trap out of direct heat loss, can serve to reduce energy consumption, keep the heat balance.
4. closed recycling system for pumping station sound level and the level of recovery of temperature, depending on the degree of recovery pump stations closed. Thermal system experts to ensure the degree of perfection of the thermal system, recycling pump station design is based on three considerations: 4.1 Flash system steam equipment steam working pressure of more than 0 .8mpa, its recycling network created a Flash system, is to reduce condensation water saturation temperature, making it less than the maximum centrifugal pump impeller temperature (150 ° c); the second is to improve Flash steam use grade so that Flash pressure relief secondary steam to meet other equipment used steam pressure level. 4.2 pressurization system of pumping station set tank set pressure is less than the recovery rate is less than 10 0.2MPa,%, and low pressure steam equipment used steam pressure required is greater than the set tank set pressure steam volume greater than 2 times the Flash content, injecting heat pumps pressurized systems to neo steam-steam jet heat pump Jet Flash steam, the steam pressure to achieve the required mix parameters, for low pressure steam users. The system matches due to the flow rate and pressure, heat utilization more fully, more favourable to the drain. 4.3 boiler feed water pump of high temperature device for recycling Anit condensation water less than 10m3/h of recycling, the use of Jet booster pumping station, resolve high-temperature centrifugal pump is saturated condensate suction problems; the use of temperature drop of the injection pressure process of cavitation Jet pump itself. This dual design, completely solves the high temperature of saturated steam when the pump delivery challenges, while to sprayInjection turbocharged theory-based research, anti-cavitation theory is to solve the problem of the pump cavitation of the most reliable and complete. For recycling water condensation is greater than 10m3/h recovery pump station, take the principle of pressure tank pressurization, set tank ensure smooth steam condensation water, pressurized cans recycled solution pump pumping temperature of saturated condensate Anit-head. Two principles of the main considerations of economy and covers issues that are resolved in closed condensed water recycling technology of effective measures. Boiler feed water pump of high temperature device guarantees Anit with pump impeller, bearing in its temperature of saturated condensate water vapour transmission, so that no ordinary pumps normal conveying more than 50 ° c water temperature.To prevent cavitation device as the main body of recycling pump station, under field conditions, vertical layout or horizontal layout; according to the economic conditions can be equipped with imported pump, can also be equipped with domestic water supply with water level, water level, pressure and water level alarm, automatic-non-condensable gas emissions full PLC and frequency control system, small footprint, automatic operation. 4. the nature of the condensation water 1 thermodynamic properties of heat energy by steam 1.1 sensible heat and latent heat of two parts, usually with steam equipment using only the release of latent heat of steam, the steam of latent heat back into the water with the temperature of saturated, that has sensible heat of condensation water. 1.2 saturated condensate in the steam pressure 0.1-steam heat in occupies 0.9MPa 15.6 ~ 26.7% higher with steam pressure, discharge of condensed water, the greater the heat value. 1.3 saturated condensate delivery process pressure drop and the existence of Flash, the Flash steam condensate water is not a drop to occur only when the steam pressure, and is lowered to large steam pressure at the maximum Flash content. Flash is a soft total soluble State, and with pressure and temperature change and transformation, which causes the condensed water recycling of complexity. 2 quality 2.1 theoretical condensed water is better of distilled water, the most suitable as boiler feed water again. 2.2 heat exchanger steam for stopping frequently to produce heat stress stretch causing equipment leaks, mixed with impure substances or Non-Condensable Gas, condensate water will produce secondary pollution. 2.3 condensate recovery decision against pollution status of processing method. 2.4 boiler feed water softening, deaerator technology is perfect and recovery network is close, condensation water pollution level size. 5. condensate closed recycling system benefits 1. And open type recovery compared to reduce water pressure to reduce losses caused by the Flash. Flash accounted for 15% of the water condensation. 2. steam equipment back pressure conditions, reduce the heat load of steam leaking at run time. 3. recycling cooling water directly into the boiler, boiler water supply temperature 50 ° c above; directly into the deaerator, second Flash and its temperature, can reduce the deaerator steam supply. 4. save water and soft water treatment costs. 5. reduced boiler emissions rate (in general consistent with condensate recovery). 6. increase the capacity of the boiler unit time, increase the amount of steam boilers, steam pressure stability. 7. reduce run, run, drip, leak and thermal pollution, improve the working environment. 8. energy utilization, reduced boiler running time, reducing dust emissions.