Methods for processing and preventing water scales in geothermal system

Abstract

The invention relates to methods for processing and preventing water scales in a geothermal system. The methods for processing and preventing the water scales in the geothermal system are characterized by aiming at solving the problems that in the geothermal system, mineral content is high and water scales are easily formed. The methods for processing and preventing the water scales in the geothermal system are capable of comprehensively solving the problem of the water scales in the geothermal system. The method for processing the water scales in the geothermal system comprises a mechanical method and a chemical method. In the chemical method for processing the water scales, not only are the water scales removed, but also a chemical compound obtained by reaction of an anti-scaling agent and the water scales is further recovered and processed. The water scales are changed into a product. The number of product chains of the system is increased. Full utilization of the materials is achieved. The method for preventing the water scales in the geothermal system comprises addition of water softener and an ion-exchange resin method. In the ion-exchange resin method, adsorbed ions in resin can be eluted through low-price regeneration liquid, and regeneration and repeated utilization of ion-exchange resin are achieved, wherein the adsorbed ions are low in price. Therefore, cost is reduced, and environment is protected. The methods for processing and preventing the water scales in the geothermal system are simple in process, economical in reagent, multiple in alternative scheme, capable of effectively solving and preventing the problem of the water scales in the geothermal system.

Description

technical field [0001] The invention relates to a method for treating and preventing scale in a geothermal system. Background technique [0002] With the rapid consumption of non-renewable resources such as oil and natural gas, geothermal energy has attracted increasing attention as a new energy source with broad development prospects. In addition to power generation, geothermal energy can also be directly used for heating, cooling, medical bathing and Various forms of industrial and agricultural heat, as well as aquaculture, etc., the extraction of geothermal energy is usually taken directly from the ground in the form of soda water mixture, because geothermal water contains a large amount of mineral impurities, such as Ca 2+ , Mg 2+ , Fe 2+ 、Al 3+ , S 2- , CO 3 2- etc., it is easy to generate carbonates and hydroxides of calcium and magnesium ions, and its solubility is different from that of general salts. It does not increase with the increase of temperature, but d...

AI Technical Summary

Problems solved by technology

[0002] With the rapid consumption of non-renewable resources such as oil and natural gas, geothermal energy has attracted increasing attention as a new energy source with broad development prospects. In addition to power generation, geothermal energy can also be directly used for heating, cooling, medical bathing and Various forms of industrial and agricultural heat, as well as aquaculture, etc., the extraction of geothermal energy is usually taken directly from the ground in the form of soda water mixture, because geothermal water contains a large amount of mineral impurities, such as Ca 2+ , Mg 2+ , Fe 2+ 、Al 3+ , S 2- , CO 3 2- etc., it is easy to generate carbonates and hydroxides of calcium and magnesium ions, and its solubility is different from that of general salts. It does not increase with the increase of temperature, but decreases with the increase of temperature. Therefore, these slightly soluble salts can easily reach a supersaturated state and crystallize out of water. When the water flow rate is relatively small or the contact surface is relatively rough, these crystalline precipitates are easy to deposit on the surface to form scale. The poor heat transfer performance of the surface will increase the heat transfer resistance, affect the heat transfer effect, and cause heat loss. For example, every 1mm thicker scale on the inner wall of the floor heating pipe will reduce the indoor temperature by 6°C; on the other hand, After scaling, scale will adhere to the inner wall of the equipment pipeline in large quantities. In severe cases, the pipeline will be blocked and the safe operation will be threatened. Industrial enterprises with severe scale will even be forced to stop production. Scaling is a common and costly problem. and thermal energy loss due to fouling cost tens of billions of dollars

Images