Recycling system for wastewater generated by chemical water treatment device of power plant
By combining a multi-element alloy catalyst system and a two-stage reverse osmosis membrane system with electrolytic chlorination technology, the problem of wastewater reuse in thermal power plants has been solved, achieving efficient recycling and low-cost wastewater treatment, and improving the recovery rate and product water quality.
Patent Information
- Application Number
- CN202423114003.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-12-17
AI Technical Summary
The concentrated water produced by the reverse osmosis treatment unit in thermal power plant has a high salt content. Direct discharge of this water would pollute the environment and waste water resources, and existing technologies have not been able to effectively reuse it.
A multi-element alloy catalyst system is used to activate the wastewater, and a two-stage, two-part reverse osmosis membrane system is combined with an electrolytic chlorination system to prepare sodium hypochlorite solution, thus forming a power plant wastewater reuse system.
It achieves efficient wastewater recycling, reduces scaling tendency, improves recovery rate, reduces the use of bactericides, lowers costs and investment expenses, and ensures product water quality.
Smart Images
Figure CN223804980U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of power plant wastewater treatment, especially relates to a reuse system of wastewater generated by power plant water treatment device. BACKGROUND
[0002] The water source of thermal power plant generally adopts surface water, municipal water supply and the like. If surface water is adopted, the water source is treated by two sets of mixed flocculation sedimentation tank equipment, so that the turbidity of effluent is less than or equal to 3 NTU, that is, the requirement of industrial water is met. The boiler make-up water treatment adopts resin softening method or full membrane method, and the full membrane method adopts ultrafiltration, reverse osmosis and EDI system. Generally, the reverse osmosis membrane system is designed to have a recovery rate of 75%. The reverse osmosis treatment device mainly supplies water for the boiler system of the power plant, and the total amount of concentrated water generated in the treatment process accounts for about 25% of the total amount of water treated, which is about 1 / 3 of the water production amount of the reverse osmosis membrane system. The impurities in the concentrated water are only concentrated from the raw water, and although no other pollutants are added, the concentrated water to be discharged has a high salt content. Under the condition of large amount of water to be discharged, if the concentrated water is directly discharged without treatment, it will inevitably pollute the surrounding environment and waste water resources. Therefore, it is necessary to reuse and treat the wastewater of the power plant water treatment device to reduce the amount of industrial water.
[0003] The scale inhibition technology of multi-element alloy catalyst is realized by a multi-element alloy catalyst material. The material is prepared by high-temperature smelting of a plurality of metal elements with different electronegativities. The material is made by a special process and is a special multi-element alloy (copper-based catalyst alloy) material with scale prevention, scale removal and corrosion prevention functions. The material has many advantages, such as no magnetism, no electricity, no need for external power supply, no need for maintenance, zero carbon and zero emission, long-term protection, water body activation, no need for salt addition, inhibition of the growth and reproduction of some bacteria, and adaptation to various conventional water pipes.
[0004] The electrolytic chlorine production technology includes electrolytic seawater chlorine production and electrolytic brine chlorine production. The electrolytic chlorine production device produces sodium hypochlorite solution on site by electrolyzing an aqueous solution containing a certain concentration of chloride ions. Sodium hypochlorite is a broad-spectrum bactericide and is widely used in the sterilization and algae removal of drinking water, industrial circulating water, sewage and seawater. The electrolytic chlorine production technology is an effective measure for pollution control and seawater biological prevention, has low cost and great use value. CONTENT OF THE UTILITY MODEL
[0005] The utility model aims at providing a reuse system of wastewater generated by a power plant water treatment device.
[0006] To this end, the above-mentioned purpose of the utility model is realized by the following technical scheme.
[0007] A reuse system of wastewater generated by a power plant water treatment device, comprising a filter, a multi-element alloy catalyst system, a reverse osmosis membrane system and an electrolytic chlorine production system connected in sequence through pipelines.
[0008] The filter is used for suspended impurities in wastewater;
[0009] The multi-element alloy catalyst system is used for activating treatment of wastewater to reduce the scaling tendency of calcium ions and magnesium ions in the wastewater;
[0010] The reverse osmosis membrane system is used for concentrating wastewater to obtain concentrated water and recycling wastewater to obtain recycled water.
[0011] The electrolytic chlorine system is used for electrolytic treatment of the concentrated water of the reverse osmosis membrane system to generate a solution containing sodium hypochlorite.
[0012] In addition to the above technical solutions, the utility model can also adopt or combine the following technical solutions:
[0013] As a preferred technical solution of the utility model: the filter is a mechanical filter;
[0014] The mechanical filter is one of a sand filter, an activated carbon filter and a multi-medium filter.
[0015] As a preferred technical solution of the utility model: the filter is a membrane filter;
[0016] The membrane filter is one of a microfiltration membrane filter, an ultrafiltration membrane filter and a nanofiltration membrane filter.
[0017] As a preferred technical solution of the utility model: the reverse osmosis membrane system is a two-stage two-section reverse osmosis membrane system, comprising a first-stage first-section reverse osmosis membrane system, a first-stage second-section reverse osmosis membrane system and a second-stage reverse osmosis membrane system,
[0018] The inlet of the first-stage first-section reverse osmosis membrane system is connected in communication with the water outlet of the multi-element alloy catalyst system, and the concentrated water outlet of the first-stage first-section reverse osmosis membrane system is connected in communication with the inlet of the first-stage second-section reverse osmosis membrane system.
[0019] The concentrated water outlet of the first-stage second-section reverse osmosis membrane system is connected in communication with the inlet of the electrolytic chlorine system.
[0020] The water production outlets of the first-stage first-section reverse osmosis membrane system and the first-stage second-section reverse osmosis membrane system are connected in communication with the inlet of the second-stage reverse osmosis membrane system, respectively.
[0021] The water production of the second-stage reverse osmosis membrane system is used as recycled water.
[0022] As a preferred technical solution of the utility model: the concentrated water outlet of the second-stage reverse osmosis membrane system is connected in communication with the inlet of the first-stage first-section reverse osmosis membrane system.
[0023] As a preferred technical scheme of the utility model: the operating pressure of the first one-stage reverse osmosis membrane system is 1.0-2.0MPa, the recovery rate is 90-95%, and the membrane flux is 15-18LMH.
[0024] As a preferred technical scheme of the utility model: the operating pressure of the first one-stage reverse osmosis membrane system is 1.0-2.0MPa, the recovery rate is 90-95%, and the membrane flux is 15-18LMH.
[0025] As a preferred technical scheme of the utility model: the operating pressure of the first one-stage reverse osmosis membrane system is 1.0-2.0MPa, the recovery rate is 90-95%, and the membrane flux is 15-18LMH.
[0026] As a preferred technical scheme of the utility model: the membrane element in the first one-stage reverse osmosis membrane system is a pollution-resistant membrane element.
[0027] The membrane element in the first one-stage reverse osmosis membrane system is a pollution-resistant membrane element.
[0028] The utility model provides a kind of reuse system of waste water generated by power plant water treatment device, mainly for the reuse treatment of concentrated water generated in reverse osmosis membrane treatment process, waste water generated by power plant water treatment device is treated by coupling of multiple alloy catalyst system, two-stage two-section reverse osmosis system, electrolytic chlorine system, especially by multiple alloy catalyst system to waste water is treated with scale inhibition, then by two-section reverse osmosis system is concentrated, two-stage reverse osmosis system is purified, finally by electrolytic chlorine device to concentrated waste water is electrolytic chlorine, and disinfectant for circulating cooling water system is prepared, specifically, with following beneficial effects:
[0029] 1), by setting multiple alloy catalyst system, the scaling tendency of waste water can be reduced, to improve the recovery rate of rear-end membrane treatment system, for example: more than 97%;
[0030] 2), by setting two-stage two-section reverse osmosis, wherein:
[0031] Two-section reverse osmosis membrane system, concentrated treatment is carried out to waste water, can improve the salt concentration in concentrated water, the operating pressure of single section is low, and energy consumption is less; two-section reverse osmosis system, reuse treatment is carried out to waste water, can improve system recovery rate, realizes emission reduction;
[0032] Two-stage reverse osmosis membrane system, concentrated reuse treatment is carried out to waste water, can obtain reuse product water with electric conductivity below 50uS / cm, reduces water intake;
[0033] 3) By setting the electrolytic chlorine system to recover the concentrated water produced by the reverse osmosis membrane system, the produced sodium hypochlorite solution can be used in the circulating cooling water system to sterilize, thereby saving the use amount of sterilizing agent.
[0034] 4) The low cost and high stability required for industrial production can be realized, and the product quality is improved and the investment cost and operation cost are reduced. BRIEF DESCRIPTION OF DRAWINGS
[0035] Figure 1 The connection diagram of the waste water reuse system produced by the power plant water treatment device provided by the utility model;
[0036] In the figure: 101-filter; 201-multiple alloy catalyst system; 311-first stage one section reverse osmosis membrane system; 312-first stage two section reverse osmosis membrane system; 321-second stage reverse osmosis membrane system; 401-electrolytic chlorine system. DETAILED DESCRIPTION
[0037] The application is described in further detail with reference to the drawings and specific examples.
[0038] A waste water reuse system produced by a power plant water treatment device, comprising a filter 101, a multiple alloy catalyst system 201, a reverse osmosis membrane system and an electrolytic chlorine system 401 connected in sequence through pipelines;
[0039] The filter 101 is used for suspended impurities in waste water;
[0040] The multiple alloy catalyst system 201 is used for activating treatment of waste water to reduce the scaling tendency of calcium ions and magnesium ions in waste water; the multiple alloy catalyst system 201 may, for example, adopt the CXESEP copper-based catalyst scale inhibitor of Nanjing Chaoxu Energy Saving Technology Co., Ltd.
[0041] The reverse osmosis membrane system is used for concentrating waste water to obtain concentrated water and reusing waste water to obtain reused water;
[0042] The reverse osmosis membrane system is a two-stage two-section reverse osmosis membrane system, comprising a first stage one section reverse osmosis membrane system 311, a first stage two section reverse osmosis membrane system 312 and a second stage reverse osmosis membrane system 321,
[0043] The inlet of the first stage one section reverse osmosis membrane system 311 is connected with the water outlet of the multiple alloy catalyst system 201, and the concentrated water outlet of the first stage one section reverse osmosis membrane system 311 is connected with the inlet of the first stage two section reverse osmosis membrane system 312;
[0044] The concentrated water outlet of the first stage two section reverse osmosis membrane system 312 is connected with the inlet of the electrolytic chlorine system 401;
[0045] The water outlet of the first-stage one-segment reverse osmosis membrane system 311 and the water outlet of the first-stage two-segment reverse osmosis membrane system 312 are connected to the inlet of the second-stage reverse osmosis membrane system 321.
[0046] The water produced by the second-stage reverse osmosis membrane system 321 is used as reclaimed water, and the conductivity of the water is less than or equal to 50 μS / cm, and the water can be used for production.
[0047] The concentrated water outlet of the second-stage reverse osmosis membrane system 321 is connected to the inlet of the first-stage one-segment reverse osmosis membrane system 311.
[0048] The electrolytic chlorine system 401 is used for electrolyzing the concentrated water of the reverse osmosis membrane system to produce a solution containing sodium hypochlorite.
[0049] In the embodiment, the filter 101 is a multi-medium filter, and in other embodiments, the filter 101 can also be selected as other available types, for example, a sand filter or an activated carbon filter, or a microfiltration membrane filter or an ultrafiltration membrane filter or a nanofiltration membrane filter.
[0050] In the embodiment, the operating pressure of the first-stage one-segment reverse osmosis membrane system 311 is 1.0-2.0 MPa, the recovery rate is 90-95%, and the membrane flux is 15-18 LMH.
[0051] The operating pressure of the first-stage two-segment reverse osmosis membrane system 312 is 2.5-3.5 MPa, the recovery rate is 60-70%, and the membrane flux is 10.0-13.0 LMH.
[0052] The operating pressure of the second-stage reverse osmosis membrane system 321 is 0.5-1.0 MPa, the recovery rate is 90-95%, and the membrane flux is 30-32 LMH.
[0053] The membrane element in the first-stage one-segment reverse osmosis membrane system 311 is a pollution-resistant membrane element, and the membrane element in the first-stage two-segment reverse osmosis membrane system 312 is a pollution-resistant membrane element.
[0054] The above specific embodiments are used to explain and illustrate the present application, and are only preferred embodiments of the present application, but not a limitation on the present application, and any modification, equivalent replacement, improvement, etc. made to the present application within the spirit of the present application and the protection scope of the claims, all fall within the protection scope of the present application.
Claims
1. A system for reusing waste water produced by a water treatment device of a power plant, characterized by: The system comprises a filter, a multi-element alloy catalyst system, a reverse osmosis membrane system and an electrolytic chlorine system connected in sequence through a pipeline. The filter is used for suspended impurities in wastewater. The multi-element alloy catalyst system is used for activating treatment of wastewater to reduce the scaling tendency of calcium ions and magnesium ions in wastewater. The reverse osmosis membrane system is used for concentrating wastewater to obtain concentrated water and recycling wastewater to obtain recycled water. The electrolytic chlorine system is used for electrolytic treatment of concentrated water of the reverse osmosis membrane system to produce a solution containing sodium hypochlorite.
2. The system of claim 1, wherein: The filter is a mechanical filter. The mechanical filter is one of a sand filter, an activated carbon filter and a multi-medium filter.
3. The system of claim 1, wherein: The filter is a membrane filter. The membrane filter is one of a microfiltration membrane filter, an ultrafiltration membrane filter and a nanofiltration membrane filter.
4. The system of claim 1, wherein: The reverse osmosis membrane system is a two-stage two-section reverse osmosis membrane system, comprising a first-stage first-section reverse osmosis membrane system, a first-stage second-section reverse osmosis membrane system and a second-stage reverse osmosis membrane system. The inlet of the first-stage first-section reverse osmosis membrane system is connected to the water outlet of the multi-element alloy catalyst system, and the concentrated water outlet of the first-stage first-section reverse osmosis membrane system is connected to the inlet of the first-stage second-section reverse osmosis membrane system. The concentrated water outlet of the first-stage second-section reverse osmosis membrane system is connected to the inlet of the electrolytic chlorine system. The water production outlets of the first-stage first-section reverse osmosis membrane system and the first-stage second-section reverse osmosis membrane system are respectively connected to the inlet of the second-stage reverse osmosis membrane system. The water production of the second-stage reverse osmosis membrane system is recycled water.
5. The system of claim 4, wherein: The concentrated water outlet of the second-stage reverse osmosis membrane system is connected to the inlet of the first-stage first-section reverse osmosis membrane system.
6. The system of claim 4, wherein: The operating pressure of the first-stage first-section reverse osmosis membrane system is 1.0-2.0 MPa, the recovery rate is 90-95%, and the membrane flux is 15-18 LMH.
7. The system of claim 4, wherein: The operating pressure of the first-stage second-section reverse osmosis membrane system is 2.5-3.5 MPa, the recovery rate is 60-70%, and the membrane flux is 10.0-13.0 LMH.
8. The system of claim 4, wherein: The operating pressure of the second-stage reverse osmosis membrane system is 0.5-1.0 MPa, the recovery rate is 90-95%, and the membrane flux is 30-32 LMH.
9. The system of claim 4, wherein: The membrane element in the first-stage first-section reverse osmosis membrane system is a pollution-resistant membrane element. The membrane element in the first-stage second-section reverse osmosis membrane system is a pollution-resistant membrane element.