Grey water quality improving device
By designing a grey water quality improvement device in the coal gasification industry, and using alkaline substances and PAM agents to adjust the pH value and flow rate of grey water, the equipment scale problem caused by high grey water hardness is solved, and more efficient water quality improvement is achieved. The operating cycle is extended, reducing operating costs.
Patent Information
- Application Number
- CN202421015825.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-10
AI Technical Summary
In the coal gasification industry, the grey water hardness in the nozzle water coal slurry gasification furnace process is high, resulting in serious scaling of equipment and pipelines. The existing treatment methods are limited in effect, which affects the long-term stable operation of the gasification device.
Design a grey water quality enhancement device, including water inlet pipeline, alkaline substance replenishment pipeline, PH meter, PAM pipeline and settlement tank, by adjusting the pH value of black water and adding PAM agents, the water hardness and solid suspension are reduced. Combined with CO2, adjust the pH value of the gray water overflow part to increase the flow rate to prevent scaling.
It significantly improves the water quality of gray water, reduces the scaling rate of equipment and pipelines, extends the operating cycle of the coal gasification system, reduces the flushing workload and operating costs, and improves economic benefits.
Smart Images
Figure CN222274313U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of equipment in the coal gasification industry, in particular to the technical field of ash water treatment in a nozzle water-coal slurry gasification furnace process. Background Art
[0002] The nozzle water-coal slurry gasifier process is used to produce synthesis gas. Ash water circulation is required at the gasifier quench ring to wash and cool the process gas. The carbon in the water-coal slurry of gasification raw materials cannot be completely converted, and contains various impurities, such as ash, calcium, magnesium ions, various soluble solids, etc., resulting in high hardness and turbidity of the ash water after washing and cooling (the ash water is dark in color and can also be called black water), making it difficult to recycle the ash water.
[0003] At present, the coal gasification industry generally adopts the flocculant precipitation process to reduce the suspended solids in the black water to improve the quality of the ash water. However, the ash water in the ash water system still contains calcium and magnesium ions, which leads to high hardness of the ash water. This leads to serious scaling of pipelines and equipment. It is necessary to regularly shut down the gasifier to flush the equipment and pipelines, which is a large workload. Scaling is one of the main factors affecting the long-term stable operation of the gasification device.
[0004] Another effective treatment method in the industry to improve the quality of gray water is to add fresh water, increase the amount of gray water in the system, and discharge the calcium and magnesium ions in the gray water. Since the downstream sewage treatment station has strict requirements on water temperature, the high-temperature gray water sent to the downstream biochemical system for treatment will affect the activity of microorganisms and needs to be cooled by the wastewater heat exchanger. At present, the floating head heat exchanger is generally used in the industry. Severe scaling in the tube will lead to reduced heat exchange efficiency, and the wastewater heat exchanger still needs to be stopped regularly for flushing. Therefore, the method of adding fresh water has limited effect and still cannot effectively solve the problem of high hardness of gray water. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide a new type of ash water treatment device to reduce the hardness of ash water, reduce the scaling rate of coal gasification system equipment and pipelines, effectively improve the quality of ash water, and overcome the defects of existing processes.
[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:
[0007] A grey water quality improvement device, comprising: a water inlet pipeline, an alkaline substance supplement pipeline, a No. 1 pH meter, a No. 1 PAM supplement pipeline and a sedimentation tank;
[0008] One end of the water inlet pipeline is used to receive black water, and the other end is connected to the sedimentation tank;
[0009] The alkaline substance supplement pipeline is connected to the water inlet pipeline and is used to add alkaline substances to adjust the pH value of black water;
[0010] The No. 1 pH meter is connected to the water inlet pipeline and is arranged after the alkaline substance supplement pipeline is connected to the water inlet pipeline to monitor the pH value of black water;
[0011] The No. 1 PAM supplementary pipeline is connected to the water inlet pipeline and is arranged after the No. 1 pH meter is connected to the water inlet pipeline, and is used to add PAM to assist flocculation.
[0012] As a further technical solution, the pH value of the black water is adjusted to 9.5-10.5, and the alkaline substance is NaOH.
[0013] As a further technical solution, the No. 1 pH meter is electrically connected to an alkaline substance regulating valve provided on the alkaline substance supplementation pipeline, and the amount of the alkaline substance added can be automatically adjusted through the alkaline substance regulating valve.
[0014] As a further technical solution, a diameter change is arranged on the water inlet pipeline at the place where the alkaline substance supplement pipeline is connected to the water inlet pipeline, so as to increase the flow rate to 1.5-2.0 m / s.
[0015] As a further technical solution, a diameter change is set on the water inlet pipeline at the place where the supplementary PAM pipeline is connected to the water inlet pipeline to increase the flow rate to about 2 m / s.
[0016] As a further technical solution, the grey water quality improvement device further comprises: a No. 2 pH meter, a CO2 supplement pipeline and a grey water overflow pipeline;
[0017] An overflow weir is provided at the upper end of the sedimentation tank, and the gray water in the upper layer of the sedimentation tank flows out through the overflow port of the overflow weir connected to the gray water overflow pipeline;
[0018] The supplementary CO2 pipeline is connected to the overflow port of the overflow weir to introduce CO2 to adjust the pH value of the grey water to between 7 and 8. A No. 2 pH meter is set on the grey water overflow pipeline to monitor the pH value.
[0019] As a further technical solution, the No. 2 pH meter is electrically connected to a CO2 regulating valve provided on the CO2 supplementary pipeline, and the amount of added CO2 can be automatically adjusted by the CO2 regulating valve.
[0020] As a further technical solution, the grey water quality improvement device further comprises: a black water direct discharge secondary line and a No. 2 supplementary PAM pipeline;
[0021] One end of the black water direct discharge secondary line is connected to the water inlet pipeline, and the other end is directly connected to the sedimentation tank;
[0022] The No. 2 supplementary PAM pipeline is connected to the black water direct discharge secondary line for adding PAM flocculation;
[0023] The position where the black water direct discharge sub-line is connected to the water inlet pipeline is arranged before the alkaline substance supplement pipeline is connected to the water inlet pipeline.
[0024] The utility model can reduce water hardness, reduce suspended solids and greatly improve water quality by arranging an alkaline substance supplement pipeline, a pH meter and a PAM supplement pipeline.
[0025] Different from other conventional ash water treatment systems with complex processes and high equipment costs, the device of the utility model greatly improves the process operation cycle of the coal gasification system, reduces the number of gasification furnace shutdowns, reduces the flushing workload, reduces operating costs, saves inspection and maintenance costs, can create better economic benefits, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.
[0027] Reference numerals:
[0028] 1 is pH meter No. 1, 2 is pH meter No. 2, 3 is water inlet pipeline, 4 is alkaline substance supplement pipeline, 5 is No. 1 PAM supplement pipeline, 6 is black water direct discharge bypass line, 7 is CO2 supplement pipeline, and 8 is gray water overflow pipeline. DETAILED DESCRIPTION
[0029] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0030] like Figure 1 As shown in an embodiment of the utility model, a grey water quality improvement device comprises: a water inlet pipeline 3, an alkaline substance supplement pipeline 4, a No. 1 pH meter 1, a No. 1 PAM supplement pipeline 5 and a sedimentation tank.
[0031] One end of the water inlet pipeline 3 is used to receive black water, and the other end is connected to the sedimentation tank. The black water can be a drainage pipeline from a vacuum flash evaporator.
[0032] The alkaline substance supplement pipeline 4 is connected to the water inlet pipeline for adding alkaline substances to adjust the pH value of black water; preferably, the pH value of black water is adjusted to 9.5-10.5, and the alkaline substance can be NaOH.
[0033] The No. 1 pH meter 1 is connected to the water inlet pipeline 3 and is arranged after the alkaline substance supplement pipeline 4 is connected to the water inlet pipeline to monitor the pH value of the black water; preferably, the No. 1 pH meter 1 is electrically connected to the alkaline substance regulating valve arranged on the alkaline substance supplement pipeline 4, and the amount of alkaline substance added can be automatically adjusted by the alkaline substance regulating valve. The specific structure of the alkaline substance regulating valve for automatic adjustment can use the existing technology and will not be repeated.
[0034] The No. 1 supplementary PAM pipeline 5 is connected to the water inlet pipeline 3 and is arranged after the No. 1 pH meter 1 is connected to the water inlet pipeline for adding PAM to assist flocculation.
[0035] In the process of increasing the pH value, local alkalinity is too strong and scaling is easy to occur. This problem can be solved by increasing the flow rate. A diameter change is set on the water inlet pipeline at the point where the alkaline substance supplement pipeline 4 is connected to the water inlet pipeline to increase the flow rate to 1.5-2.0m / s.
[0036] After adding PAM agent to assist flocculation, in order to prevent the sediment from scaling and adhering to the pipeline, the flow rate can be increased. A diameter change is set on the water inlet pipeline at the point where the supplementary PAM pipeline 5 is connected to the water inlet pipeline to increase the flow rate to about 2m / s.
[0037] In one embodiment, a grey water quality improvement device further includes: a No. 2 pH meter 2 , a CO2 supplement pipeline 7 and a grey water overflow pipeline 8 .
[0038] The upper grey water of the sedimentation tank overflows to the grey water tank. An overflow weir is provided at the upper end of the sedimentation tank, and the upper grey water of the sedimentation tank flows out through the overflow port of the overflow weir connected to the grey water overflow pipeline 8, and the supplementary CO2 pipeline 7 is connected to the overflow port of the overflow weir to introduce CO2 to adjust the pH value of the grey water to between 7 and 8. A No. 2 pH meter 2 is provided on the grey water overflow pipeline 8 to monitor the pH value; preferably, the No. 2 pH meter 2 is electrically connected to the CO2 regulating valve provided on the supplementary CO2 pipeline 7, and the amount of CO2 added can be automatically adjusted through the CO2 regulating valve. The specific structure of the automatic adjustment of the CO2 regulating valve can use the existing technology and will not be repeated.
[0039] In one embodiment, a grey water quality improvement device further includes: a black water direct discharge bypass line 6 and a No. 2 PAM supplementary pipeline; one end of the black water direct discharge bypass line 6 is connected to the water inlet pipeline 3, and the other end is directly connected to the sedimentation tank; the No. 2 PAM supplementary pipeline is connected to the black water direct discharge bypass line 6 for adding PAM flocculation; the position where the black water direct discharge bypass line 6 is connected to the water inlet pipeline 3 is set before the supplementary alkaline substance pipeline 4 is connected to the water inlet pipeline.
[0040] The water inlet pipeline 3 connected to the supplementary alkaline substance pipeline 4 and the No. 1 supplementary PAM pipeline 5 is the main line, and the black water direct discharge sub-line 6 is the sub-line. The main line adds alkaline substances and PAM to the black water to improve the water quality by reducing the water hardness and reducing suspended solids. The sub-line only adds PAM to the black water and can only improve the water quality by reducing suspended solids. The sub-line can be used when the black water hardness is not high to save costs; the sub-line can also be used as a temporary replacement for the main line when the main line needs to be repaired.
[0041] The operation mode and principle of the utility model are as follows:
[0042] The utility model transforms the drainage pipeline of the vacuum flash evaporator, firstly adds alkaline substances to adjust the black water pH value to 9.5-10.5, and the alkaline agent can be selected as NaOH. In the process of increasing the pH, the local alkalinity is too strong and easy to scale, which can be solved by increasing the flow rate. A variable diameter is set at the alkaline agent addition point to control the flow rate to 1.5-2.0m / s. In order to monitor the pH value, a pH meter is set after the alkaline agent addition point, and the pH value and the alkaline agent regulating valve are designed to be automatically controlled.
[0043] After the pH is adjusted to the target value, calcium and magnesium ions will react with carbonate ions under alkaline conditions and precipitate. PAM reagents are added to assist in flocculation of the precipitate. To prevent the precipitate from scaling and adhering to the pipe, a variable diameter is set here to increase the flow rate to about 2m / s. PAM (polyacrylamide) is a general term for polymers obtained by copolymerization of acrylamide homopolymers or other monomers. One of its main application areas is water treatment.
[0044] Then it enters the sedimentation tank for flocculation and sedimentation, and then enters the filter press together with the ash water fine residue for filtration. The separated filtrate is sent to the outside of the boundary area.
[0045] The clear ash water on the upper layer of the sedimentation tank overflows into the ash water tank through the ash water overflow pipeline. CO2 is introduced at the overflow port of the overflow weir to adjust the pH to between 7 and 8. A pH meter is installed on the ash water overflow pipeline to monitor the pH value.
[0046] At the same time, in order to facilitate the overall cutting out of the hard removal pipeline, a direct discharge bypass line from the vacuum flash evaporator to the sedimentation tank is designed.
[0047] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. A grey water quality improvement device, characterized in that: It includes: water inlet pipeline, alkaline supplement pipeline, No. 1 pH meter, No. 1 PAM supplement pipeline and sedimentation tank; One end of the water inlet pipeline is used to receive black water, and the other end is connected to the sedimentation tank; The alkaline substance supplement pipeline is connected to the water inlet pipeline and is used to add alkaline substances to adjust the pH value of black water; The No. 1 pH meter is connected to the water inlet pipeline and is arranged after the alkaline substance supplement pipeline is connected to the water inlet pipeline to monitor the pH value of black water; The No. 1 PAM supplementary pipeline is connected to the water inlet pipeline and is arranged after the No. 1 pH meter is connected to the water inlet pipeline, and is used to add PAM to assist flocculation.
2. A grey water quality improvement device according to claim 1, characterized in that: The pH value of the black water is adjusted to 9.5-10.5, and the alkaline substance is NaOH.
3. A grey water quality improvement device according to claim 2, characterized in that: The No. 1 pH meter is electrically connected to an alkaline substance regulating valve arranged on the alkaline substance supplement pipeline, and the amount of the alkaline substance added can be automatically adjusted through the alkaline substance regulating valve.
4. A grey water quality improvement device according to claim 1, 2 or 3, characterized in that: A diameter change is arranged on the water inlet pipeline at the place where the alkaline substance supplement pipeline is connected to the water inlet pipeline to increase the flow rate to 1.5-2.0 m / s.
5. The grey water quality improvement device according to claim 4, characterized in that: A diameter change is set on the water inlet pipeline at the place where the supplementary PAM pipeline is connected to the water inlet pipeline to increase the flow rate to about 2 m / s.
6. The grey water quality improvement device according to claim 5, characterized in that: It also includes: No. 2 pH meter, make-up CO2 pipeline and grey water overflow pipeline; An overflow weir is provided at the upper end of the sedimentation tank, and the gray water in the upper layer of the sedimentation tank flows out through the overflow port of the overflow weir connected to the gray water overflow pipeline; The supplementary CO2 pipeline is connected to the overflow port of the overflow weir to introduce CO2 to adjust the pH value of the grey water to between 7 and 8. A No. 2 pH meter is set on the grey water overflow pipeline to monitor the pH value.
7. A grey water quality improvement device according to claim 6, characterized in that: The No. 2 pH meter is electrically connected to a CO2 regulating valve provided on the CO2 supplementary pipeline, and the amount of added CO2 can be automatically adjusted through the CO2 regulating valve.
8. The grey water quality improvement device according to claim 5, characterized in that: It also includes: the black water direct discharge bypass line and the No. 2 supplementary PAM pipeline; One end of the black water direct discharge secondary line is connected to the water inlet pipeline, and the other end is directly connected to the sedimentation tank; The No. 2 supplementary PAM pipeline is connected to the black water direct discharge secondary line for adding PAM flocculation; The position where the black water direct discharge sub-line is connected to the water inlet pipeline is arranged before the alkaline substance supplement pipeline is connected to the water inlet pipeline.