Coal gasification grey water treatment device
The coal gasification ash water treatment device uses components such as filters, hydrogen ion exchangers, and carbon dioxide removers to remove suspended solids and ions from the coal gasification ash water, solving the problems of hardness and alkalinity, and realizing the recycling of ash water and the stable operation of the device.
Patent Information
- Application Number
- CN202520294714.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Existing technologies cannot economically, efficiently, and stably reduce the hardness and alkalinity of coal gasification slag water systems, leading to the need for continuous sewage discharge from gasification units and increased water consumption, resulting in scaling in downstream pipelines and increased water costs.
A coal gasification ash water treatment device is adopted, including a filter, a hydrogen ion exchanger, a carbon dioxide remover, and a water tank. Suspended solids, cations, and carbon dioxide are removed through physical interception, ion exchange, and gas stripping, thereby reducing the hardness and alkalinity of the ash water.
This enables the recycling of ash water, reduces the amount of water discharged and replenished by the gasification unit, lowers the tendency to scale, and is conducive to the long-term stable operation of the gasification unit.
Smart Images
Figure CN223936369U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal chemical technology, and in particular to a coal gasification ash water treatment device. Background Technology
[0002] During the coal gasification process, some metal ions in the raw coal dissolve into the water during the contact between the ash and water, resulting in the coal gasification slag water system having characteristics such as high hardness and high alkalinity.
[0003] Existing treatment processes are unable to economically, efficiently, and stably reduce the hardness and alkalinity of sludge, forcing gasification units to continuously discharge large amounts of wastewater to prevent the accumulation of scaling ions. This results in severe scaling in downstream pipeline systems and increased wastewater discharge; furthermore, the gasification unit needs to replenish large amounts of demineralized water due to wastewater discharge, increasing water consumption and water costs.
[0004] Therefore, a solution is needed that can effectively reduce the hardness and alkalinity of coal gasification ash water. Utility Model Content
[0005] The purpose of this invention is to provide a coal gasification ash water treatment device to at least partially solve the above-mentioned problems of the prior art.
[0006] To achieve the above objectives, this utility model provides a coal gasification ash water treatment device, comprising: a coal gasification ash water pipeline, a filter, a hydrogen ion exchanger, a carbon dioxide remover, and a water tank; wherein...
[0007] The filter receives coal gasification ash water through the coal gasification ash water pipeline and removes suspended solids from the coal gasification ash water;
[0008] The hydrogen ion exchanger is connected to the filter through the coal gasification ash water pipeline to reduce the alkalinity and / or hardness of the coal gasification ash water;
[0009] The carbon dioxide remover is connected to the hydrogen ion exchanger through the coal gasification ash water pipeline to remove free carbon dioxide from the coal gasification ash water;
[0010] The water tank is connected to the carbon dioxide remover via the coal gasification ash water pipeline, and receives the ash water after passing through the carbon dioxide remover.
[0011] Preferably, the device further includes a sodium ion exchanger for reducing the hardness of the coal gasification ash water;
[0012] The sodium ion exchanger is connected in parallel with the hydrogen ion exchanger.
[0013] Preferably, the device further includes a sodium ion exchanger for reducing the hardness of the coal gasification ash water;
[0014] The sodium ion exchanger is connected to the water tank through the coal gasification ash water pipeline and outputs the coal gasification ash water with reduced hardness.
[0015] Preferably, the device further includes a water pump for pumping coal gasification ash water from the water tank into the sodium ion exchanger.
[0016] Preferably, the carbon dioxide remover is also directly connected to the filter through the coal gasification ash water pipeline, so that a portion of the coal gasification ash water passing through the filter is directly input into the carbon dioxide remover, and a portion passes through the hydrogen ion exchanger before being input into the carbon dioxide remover.
[0017] Preferably, the carbon dioxide remover includes a fan for providing airflow to the carbon dioxide remover.
[0018] Compared with the prior art, the present invention has at least the following advantages:
[0019] By adopting the coal gasification ash water treatment device provided in this embodiment, the hardness of coal gasification ash water can be reduced while reducing most of the alkalinity in the ash water. The treated coal gasification ash water can be returned to the gasification system for recycling, which improves the recycling rate of the slag and ash water system, reduces the amount of water discharged from the gasification system and the amount of water replenished, reduces the scaling tendency of the slag and water system, and is conducive to the long-term stable operation of the gasification device. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of a coal gasification ash water treatment device provided in Embodiment 1 of this utility model.
[0021] Figure 2 This is a schematic diagram of the structure of a coal gasification ash water treatment device provided in Embodiment 2 of this utility model.
[0022] Figure 3 This is a schematic diagram of the structure of a coal gasification ash water treatment device provided in Embodiment 3 of this utility model.
[0023] Figure 4 This is a schematic diagram of the structure of a coal gasification ash water treatment device provided in Embodiment 4 of this utility model. Detailed Implementation
[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate to understand the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a product or device comprising a series of units is not necessarily limited to those explicitly listed, but may include other units not explicitly listed or inherent to such product or device.
[0026] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0027] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.
[0028] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.
[0029] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0030] Example 1
[0031] This embodiment provides a coal gasification ash water treatment device. Figure 1 A schematic diagram of the structure of the coal gasification ash water treatment device is shown, as follows: Figure 1 As shown, the device includes: a coal gasification ash water pipeline 2, a filter 3, a hydrogen ion exchanger 4, a carbon dioxide remover 6, and a water tank 8; wherein
[0032] Filter 3 receives gasification ash water through gasification ash water pipeline 2 and removes suspended solids from the gasification ash water;
[0033] The hydrogen ion exchanger 4 is connected to the filter 3 through the coal gasification ash water pipeline 2, and is used to reduce the alkalinity and / or hardness of the coal gasification ash water.
[0034] The carbon dioxide remover 6 is connected to the hydrogen ion exchanger 4 through the coal gasification ash water pipeline 2 to remove free carbon dioxide from the coal gasification ash water.
[0035] Water tank 8 is connected to carbon dioxide remover 6 via coal gasification ash water pipeline 2, and receives ash water after passing through carbon dioxide remover 6.
[0036] Among them, filter 3 mainly removes suspended solids in water through physical interception, adsorption and sieving, and can also remove particulate matter and impurities from gray water.
[0037] The common working principles of filter 3 include:
[0038] Pressure filtration: Water is forced through porous media (such as quartz sand, anthracite, activated carbon, etc.) under a certain pressure, and suspended solids are trapped on the surface or in the pores of the media.
[0039] Vacuum filtration: By reducing the system pressure, suspended solids in the water are adsorbed onto the filter cloth or filter disc under negative pressure.
[0040] After suspended solids are removed from the coal gasification ash water, it enters hydrogen ion exchanger 4. Hydrogen ion exchanger 4 removes cations from the water using ion exchange; for example, the interior of the hydrogen ion exchanger can be filled with hydrogen-type cation exchange resin. When the ash water passes through the exchanger, cations in the water (such as calcium ions, Ca2+) are removed. 2+ Magnesium ions (Mg) 2+ (etc.) and hydrogen ions (H) on the resin + An ion exchange reaction occurs, where cations in the water are adsorbed by the resin, while hydrogen ions are released into the water, thus achieving water softening and partial desalination. The bicarbonate ions (HCO3-) in grey water...- It can also react with hydrogen ions (H+). + The reaction produces carbon dioxide (CO2) and water, thereby reducing the alkalinity of the ash water.
[0041] Carbon dioxide remover 6 is used to remove free carbon dioxide from the ash water of coal gasification. The working principle of carbon dioxide remover 6 is based on Henry's Law, which states that the solubility of a gas in water is directly proportional to its partial pressure in the gas phase. When the partial pressure of carbon dioxide in water is higher than that in air, the carbon dioxide will precipitate from the water and be carried away by the air.
[0042] Carbon dioxide removers are generally divided into two types:
[0043] Blower-type carbon separator: Water enters from the top of the equipment and is evenly sprayed onto the packing layer through a water distribution device, forming a water film. Air is blown in from the bottom, coming into counter-current contact with the water, blowing off the carbon dioxide and expelling it from the top.
[0044] Vacuum decarbonizer: A vacuum pump or ejector is used to create a vacuum at the top of the decarbonizer, causing the water to reach its boiling point, thereby removing carbon dioxide and other gases dissolved in the water.
[0045] In a preferred embodiment, such as Figure 1 As shown, the carbon dioxide remover 6 is a blower-type carbon remover, which may include a fan 7 for providing air source for the carbon dioxide remover 6.
[0046] By adopting the coal gasification ash water treatment device provided in this embodiment, the hardness of coal gasification ash water can be reduced while reducing most of the alkalinity in the ash water. The treated coal gasification ash water can be returned to the gasification system for recycling, which improves the recycling rate of the slag and ash water system, reduces the amount of water discharged from the gasification system and the amount of water replenished, reduces the scaling tendency of the slag and water system, and is conducive to the long-term stable operation of the gasification device.
[0047] Example 2
[0048] This embodiment provides a coal gasification ash water treatment device. Figure 2 A schematic diagram of the structure of the coal gasification ash water treatment device is shown, as follows: Figure 2 As shown, the device includes: a coal gasification ash water pipeline 2, a filter 3, a hydrogen ion exchanger 4, a sodium ion exchanger 5, a carbon dioxide remover 6, and a water tank 8; wherein
[0049] Filter 3 receives gasification ash water through gasification ash water pipeline 2 and removes suspended solids from the gasification ash water;
[0050] The hydrogen ion exchanger 4 is connected to the filter 3 through the coal gasification ash water pipeline 2, and is used to reduce the alkalinity and / or hardness of the coal gasification ash water.
[0051] Sodium ion exchanger 5 is connected in parallel with hydrogen ion exchanger 4 to reduce the hardness of the coal gasification ash water.
[0052] The carbon dioxide remover 6 is connected to the hydrogen ion exchanger 4 through the coal gasification ash water pipeline 2 to remove free carbon dioxide from the coal gasification ash water.
[0053] Water tank 8 is connected to carbon dioxide remover 6 via coal gasification ash water pipeline 2, and receives ash water after passing through carbon dioxide remover 6.
[0054] The core of the sodium ion exchanger 5 is to use sodium-type cations to exchange calcium and magnesium ions in water, converting hard water into soft water. For example, the operation of the sodium ion exchanger is based on the adsorption and displacement of ion exchange resin. When hard water passes through the sodium ion exchanger, calcium and magnesium ions in the water are adsorbed by the resin, while sodium ions on the resin are displaced into the water.
[0055] The chemical reaction equation is as follows:
[0056] Ca 2+ +2NaR→CaR2+2Na +
[0057] Mg 2+ +2NaR→MgR2+2Na + .
[0058] When sodium ions in the resin are completely replaced by calcium and magnesium ions, the resin becomes ineffective and needs to be regenerated.
[0059] The filter 3, hydrogen ion exchanger 4, and carbon dioxide remover 6 can be referred to the specific description in Example 1, and will not be repeated here.
[0060] The difference between this embodiment and Embodiment 1 is the addition of a sodium ion exchanger 5, which is connected in parallel with the hydrogen ion exchanger 4 to reduce the hardness of the coal gasification ash water. Through this design, the gasification ash water processed by the hydrogen ion exchanger 4 has all its alkalinity and some hardness removed, while the gasification ash water processed by the sodium ion exchanger 5 has all its hardness removed. The alkalinity and hardness of the effluent from the entire system can be adjusted by the water volume distribution ratio, making the treated water volume adjustable and the product water quality controllable.
[0061] Example 3
[0062] This embodiment provides a coal gasification ash water treatment device. Figure 3 A schematic diagram of the structure of the coal gasification ash water treatment device is shown, as follows: Figure 3 As shown, the device includes: a coal gasification ash water pipeline 2, a filter 3, a hydrogen ion exchanger 4, a sodium ion exchanger 5, a carbon dioxide remover 6, and a water tank 8; wherein
[0063] Filter 3 receives gasification ash water through gasification ash water pipeline 2 and removes suspended solids from the gasification ash water;
[0064] The hydrogen ion exchanger 4 is connected to the filter 3 through the coal gasification ash water pipeline 2, and is used to reduce the alkalinity and / or hardness of the coal gasification ash water.
[0065] The carbon dioxide remover 6 is connected to the hydrogen ion exchanger 4 through the coal gasification ash water pipeline 2 to remove free carbon dioxide from the coal gasification ash water.
[0066] Water tank 8 is connected to carbon dioxide remover 6 via coal gasification ash water pipeline 2, and receives ash water after passing through carbon dioxide remover 6.
[0067] Sodium ion exchanger 5 is connected to water tank 8 through coal gasification ash water pipeline 2. It is used to reduce the hardness of coal gasification ash water and output coal gasification ash water with reduced hardness.
[0068] In a preferred embodiment, a water pump 9 is also included for pumping coal gasification ash water from the water tank 8 into the sodium ion exchanger 5.
[0069] The filter 3, hydrogen ion exchanger 4, sodium ion exchanger 5, and carbon dioxide remover 6 in this embodiment can be referred to the specific descriptions in Embodiments 1 and 2, and will not be repeated here.
[0070] The difference between this embodiment and embodiment 2 is that the sodium ion exchanger 5 is not connected in parallel with the hydrogen ion exchanger 4, but is connected in series after the water tank 8, so as to remove all alkalinity and hardness from the water, resulting in good water quality from the system.
[0071] Example 4
[0072] This embodiment provides a coal gasification ash water treatment device. Figure 4 A schematic diagram of the structure of the coal gasification ash water treatment device is shown, as follows: Figure 4 As shown, the device includes: a coal gasification ash water pipeline 2, a filter 3, a hydrogen ion exchanger 4, a sodium ion exchanger 5, a carbon dioxide remover 6, and a water tank 8; wherein
[0073] Filter 3 receives gasification ash water through gasification ash water pipeline 2 and removes suspended solids from the gasification ash water;
[0074] The hydrogen ion exchanger 4 is connected to the filter 3 through the coal gasification ash water pipeline 2, and is used to reduce the alkalinity and / or hardness of the coal gasification ash water.
[0075] The carbon dioxide remover 6 is connected to the hydrogen ion exchanger 4 through the coal gasification ash water pipeline 2 to remove free carbon dioxide from the coal gasification ash water.
[0076] Water tank 8 is connected to carbon dioxide remover 6 via coal gasification ash water pipeline 2, and receives ash water after passing through carbon dioxide remover 6.
[0077] Sodium ion exchanger 5 is connected to water tank 8 through coal gasification ash water pipeline 2. It is used to reduce the hardness of coal gasification ash water and output coal gasification ash water with reduced hardness.
[0078] Among them, the carbon dioxide remover 6 is also directly connected to the filter 3 through the coal gasification ash water pipeline 2, so that part of the coal gasification ash water passing through the filter 3 is directly input into the carbon dioxide remover 6, and part of it is input into the carbon dioxide remover 6 after passing through the hydrogen ion exchanger 4.
[0079] In a preferred embodiment, the carbon dioxide remover 6 includes a fan 7 for providing airflow to the carbon dioxide remover 6.
[0080] The filter 3, hydrogen ion exchanger 4, sodium ion exchanger 5, and carbon dioxide remover 6 in this embodiment can be referred to the specific descriptions in Embodiments 1 and 2, and will not be repeated here.
[0081] The difference between this embodiment and embodiment 3 is that the carbon dioxide remover 6 is also directly connected to the filter 3 through the coal gasification ash water pipeline 2, so that part of the coal gasification ash water passing through the filter 3 is directly input into the carbon dioxide remover 6, and part of it passes through the hydrogen ion exchanger 4 and then enters the carbon dioxide remover 6, thereby achieving the purpose of controlling the alkalinity removal rate according to the water quality. The hardness of the effluent from this system is completely removed, and the effluent water quality is relatively good.
[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A coal gasification ash water treatment device, characterized in that, include: The gasification ash water pipeline (2), filter (3), hydrogen ion exchanger (4), carbon dioxide remover (6), and water tank (8); in The filter (3) receives coal gasification ash water through the coal gasification ash water pipeline (2) and removes suspended solids from the coal gasification ash water; The hydrogen ion exchanger (4) is connected to the filter (3) through the coal gasification ash water pipeline (2) to reduce the alkalinity and / or hardness of the coal gasification ash water; The carbon dioxide remover (6) is connected to the hydrogen ion exchanger (4) through the coal gasification ash water pipeline (2) to remove free carbon dioxide from the coal gasification ash water; The water tank (8) is connected to the carbon dioxide remover (6) through the coal gasification ash water pipeline (2) and receives the ash water after passing through the carbon dioxide remover (6).
2. The coal gasification ash water treatment device according to claim 1, characterized in that, It also includes a sodium ion exchanger (5) for reducing the hardness of the coal gasification ash water; The sodium ion exchanger (5) is connected in parallel with the hydrogen ion exchanger (4).
3. The coal gasification ash water treatment device according to claim 1, characterized in that, It also includes a sodium ion exchanger (5) for reducing the hardness of the coal gasification ash water; The sodium ion exchanger (5) is connected to the water tank (8) through the coal gasification ash water pipeline (2) and outputs the coal gasification ash water with reduced hardness.
4. The coal gasification ash water treatment device according to claim 3, characterized in that, It also includes a water pump (9) for pumping coal gasification ash water from the water tank (8) into the sodium ion exchanger (5).
5. The coal gasification ash water treatment device according to claim 3 or 4, characterized in that, The carbon dioxide remover (6) is also directly connected to the filter (3) through the coal gasification ash water pipeline (2), so that a portion of the coal gasification ash water passing through the filter (3) is directly input into the carbon dioxide remover (6), and a portion is input into the carbon dioxide remover (6) after passing through the hydrogen ion exchanger (4).
6. The coal gasification ash water treatment device according to any one of claims 1-4, characterized in that, The carbon dioxide remover (6) includes a fan (7) for providing airflow to the carbon dioxide remover (6).