china steam boiler industry

The waste heat recovery system raises the temperature at which absorption of SO3 , and the addition of water, takes place during the production of sulphuric acid. By operating at these higher temperatures, the heat of absorption and dilution can be used to generate steam instead of being rejected to a cooling tower. The change which makes this possible is the discovery by Monsanto Enviro-Chem that several commercial alloys are resistant to corrosion at high temperatures if sulphuric acid strengths are kept at greater than 99%. Through studies and process design changes, Monsanto developed a way to operate in the narrow band of acceptable temperatures and strengths, without degrading plant performance. The heat recovery system replaces the normal inter-pass tower with a two-stage absorbing tower, a recirculating pump, heat exchangers and a waste heat recovery boiler. The tower is made from stainless steel and contains ceramic packing. Gas containing sulphur trioxide leaves the converter system and enters the heat recovery tower near the bottom. It passes upwards through two packed beds and a mist eliminator before leaving the tower at the top. The lower stage performs most of the absorption and is run at a temperature necessary to generate the steam. The upper stage uses a low flow of cool acid to provide trim absorption so the tower can meet emission targets. A special high efficiency distributor system is used in both stages because the system is operating very close to chemical equilibrium limits.

This is our first collaboration with fast boiler, professional and caring service fast boiler's impressed us. From pre-sales advice to after-sales guidance, every step is very careful and thoughtful. They provide hot water boiler performance is also very good, and effectively improve the level of our heating units. --customer feedback

What chemical plant boiler water treatment problems in boiler water treatment chemical problems in which there are (1) do not pay attention heating boiler water treatment. Hot water boilers and china steam boiler industrys, there are significant differences between them. Because the hot water boiler in most of the water is recycled. Hot water boiler and the boiler is filled conduit, if less consumption, water will become less, the temperature will be lower than the hot water boiler steam boilers, hot water boilers and therefore the risk of corrosion is greater than the risk of fouling. Because soft water boiler will lose the protection layer of calcium, severe corrosion of boilers, pipes and fan coil. Some developed countries in Europe and America, has now changed the way water treatment sodium ion exchange. Shutdown maintenance (2) ignore boiler. In our country, basically the use of winter heating boiler. These boilers Each year, about eight months in a shutdown state. Most chemical plant boilers user does not make any protective measures during boiler shutdown, resulting in accelerated corrosion of the boiler. In addition, during the operation does not take any measures to clean up the boiler, some of the corrosion product will be in the secondary boiler circulating water, thereby causing secondary corrosion of the boiler, the boiler water into rust red. Visible, do not attach importance to the maintenance shutdown of the boiler, corrosion resulting corrosion generated worse than running, losses will be more. (3) chemical plant boiler water treatment personnel lack their own quality. For chemical plant boiler business, the ability to do the job boiler water treatment, not only with the boiler unit whether the conditions of water treatment, water treatment equipment and pharmaceutical and other factors is complete, and still have their own quality water treatment personnel contact directly. In the current boiler units, which are mostly part-time work by the fireman water treatment. They do not have the knowledge of water treatment, the principle of water treatment, water treatment chemicals performance, usage and timing of medication and so is not particularly clear, in particular, can not fully master the use of water treatment equipment, often using the wrong medicine will appear, not in accordance with the standard drug situation. And when the boiler water treatment, if treatment is not used properly, could be counterproductive situation.

Combustion air staging the first stage fuel rich combustion, excess air is added in the second stage, the lean burn combustion, the air is cooled between the two was added to ensure that the combustion temperature will not be too high. Combustion air staging and fuel staging combustion contrary, with the first stage fuel lean combustion, fuel is added in the second stage so that the equivalent ratio required value is achieved. These two methods will eventually cause the excess air ratio of the entire system to maintain a constant, low nitrogen currently widely used as combustion control technique. (2) lean premixed combustion technology refers premixed combustion fuel and oxidant completely mixed at the molecular level before the mixture is ignited. For controlling the generation of NOx, this technique has the advantage of controlling the combustion temperature can be achieved by fully controlling the equivalent ratio, thereby reducing thermal NOx formation rates, in some cases, partially premixed and the premixed combustion than non-premixed 85% -90% of combustion to reduce NOx production. Further, the premix can also be reduced completely to reduce the excess air ratio due to unevenness caused by generation control of NOx. However, premixed combustion technology there are still unresolved technical difficulties on the security control: First, because of its highly combustible premixed gas may cause tempering; the second is too high excess air ratio will lead to an increase in exhaust losses , reduces the thermal efficiency of the boiler. (3) internal and external flue gas recirculation to reduce the combustion temperature of flue gas recirculation techniques may be implemented by adding a flame zone in the flue gas, the flue gas is added to reduce the combustion temperature of the endothermic.

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