Hydrogen peroxide supply device for wood pulp bleaching process

Abstract

The utility model relates to the technical field of paper pulp bleaching, and discloses a hydrogen peroxide supply device for a wood pulp bleaching process, which comprises an oxygen generator, a water purifier, a liquid caustic soda pressure stabilizing and filtering system, a hydrogen peroxide electrolysis production system, an energy storage system and the like. And an alkaline hydrogen peroxide storage tank is arranged on the outer side of the hydrogen peroxide electrolysis production system. According to the hydrogen peroxide supply device for the wood pulp bleaching process, in order to better control the flow of alkaline hydrogen peroxide, high-purity oxygen is stably supplied through the oxygen generator, and the liquid caustic soda pressure is stabilized and impurities are filtered through the liquid caustic soda pressure stabilizing and filtering device, so that the stable quality of the generated alkaline hydrogen peroxide is ensured; the alkaline hydrogen peroxide outlet flow meter and the alkaline hydrogen peroxide discharging pump work cooperatively, the flow of the alkaline hydrogen peroxide can be accurately controlled according to actual requirements, accurate supply is achieved, and the problem that the bleaching effect is unstable due to fluctuation of the dosage of the hydrogen peroxide is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper pulp bleaching technical field, concretely is a hydrogen peroxide supply device for wood pulp bleaching process. BACKGROUND

[0002] Hydrogen peroxide is a colorless transparent liquid, a little with a little irritating smell, it has the risk of burning and explosion, can combustion, and has strong irritability, the dangerous nature of hydrogen peroxide lies in, it is a strong explosive oxidant, hydrogen peroxide (hydrogen peroxide) does not spontaneously combust, but can react with combustible material and emit a lot of heat and oxygen to cause fire and explosion and other dangerous conditions, the storage and transportation of hydrogen peroxide is relatively strict, all need to do well pressure relief facilities, prevent oxygen decomposition overpressure explosion, also need and flammable, reducing agent is placed separately, to prevent fire and explosion, in the papermaking industry, hydrogen peroxide is mainly used in paper pulp bleaching field, in the process of paper pulp hydrogen peroxide bleaching, hydrogen peroxide can oxidize many substances, including organic matter and inorganic matter, hydrogen peroxide releases oxygen molecules, and the carbon-carbon or carbon-oxygen chemical bonds in pigment molecules are oxidized and broken, so that the pigment molecules become colorless, in this way, the pigment on the surface of the substance is removed, and it becomes more white.

[0003] The addition of hydrogen peroxide and liquid alkali in the existing paper pulp bleaching process is carried out separately, and the hydrogen peroxide is high concentration, such as 50%, 60% and the like, and the concentration of liquid alkali is 30%, 32% and 50%. The high-concentration hydrogen peroxide added to the paper pulp is easy to decompose quickly, resulting in a decrease in the hydrogen peroxide content in the later mixing stage, and the mixing effect of high-concentration hydrogen peroxide and liquid alkali with the paper pulp is poorer than that of low-concentration hydrogen peroxide and liquid alkali.

[0004] Therefore, we propose a hydrogen peroxide supply device for wood pulp bleaching process. Utility model content

[0005] The utility model aims at providing a hydrogen peroxide supply device for wood pulp bleaching process to solve the problems in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme: including oxygen generator, hydrogen peroxide electrolytic production system, the oxygen generator is connected with hydrogen peroxide electrolytic production system, the hydrogen peroxide electrolytic production system outside is provided with alkaline hydrogen peroxide storage tank, the alkaline hydrogen peroxide storage tank side is provided with vice alkali storage tank, alkaline hydrogen peroxide outlet flow meter is set up on the alkaline hydrogen peroxide storage tank export pipeline, the alkaline hydrogen peroxide storage tank is connected with alkaline hydrogen peroxide supply system, the vice alkali storage tank is fixedly connected vice alkali discharge pump, the pipeline of hydrogen peroxide electrolytic production system is connected with self-cleaning filter, alkaline hydrogen peroxide discharge pump is set up in alkaline hydrogen peroxide supply system, liquid alkali supply pipeline is set up on hydrogen peroxide electrolytic production system, liquid alkali pressure stabilizing filter device is set up on liquid alkali supply pipeline.

[0007] Preferably, the oxygen generator has an oxygen purity of 93% or higher, and stably supplies the oxygen to the cathode of the hydrogen peroxide electrolysis production system.

[0008] Preferably, the hydrogen peroxide electrolysis production system receives liquid caustic from the liquid caustic pressure stabilizing filter device at the anode, and performs electrolysis under the action of stable direct current to generate by-product caustic.

[0009] Preferably, the alkaline hydrogen peroxide discharge pump can transport alkaline hydrogen peroxide out of the alkaline hydrogen peroxide storage tank, and the transport flow rate can be adjusted.

[0010] Preferably, according to the demand for hydrogen peroxide at the target location, the speed of the alkaline hydrogen peroxide discharge pump is adjusted by the control system to achieve precise hydrogen peroxide supply.

[0011] Preferably, the alkaline hydrogen peroxide outlet flow meter can monitor the flow data of the alkaline hydrogen peroxide in real time, and transmit the data to the control system to achieve precise control of the supply of alkaline hydrogen peroxide.

[0012] Preferably, the oxygen generator is connected to an energy storage device that stores wind energy, photovoltaic generated electricity, and low-cost off-peak electricity generated electricity to supply electricity to the hydrogen peroxide supply device, which can effectively reduce the energy consumption of hydrogen peroxide production.

[0013] Compared with the prior art, the hydrogen peroxide supply device for wood pulp bleaching process has the following beneficial effects:

[0014] 1. The hydrogen peroxide supply device for wood pulp bleaching process, in order to better control the product quality of alkaline hydrogen peroxide, stably supplies high-purity oxygen by an oxygen generator, and stably filters impurities and adjusts the pressure of liquid caustic by a liquid caustic pressure stabilizing filter device, to ensure the quality stability of the generated alkaline hydrogen peroxide. The alkaline hydrogen peroxide outlet flow meter and the alkaline hydrogen peroxide discharge pump work together to accurately control the flow of alkaline hydrogen peroxide according to actual demand, realize precise supply, and reduce problems such as unstable bleaching effect caused by fluctuation of hydrogen peroxide consumption.

[0015] 2. The hydrogen peroxide supply device for wood pulp bleaching process, in order to improve the adaptability of the system in different production scenarios, the alkaline hydrogen peroxide supply system can be flexibly adjusted according to different production demands, and by adjusting the parameters of the alkaline hydrogen peroxide discharge pump and related valves, it can adapt to different requirements for hydrogen peroxide flow, pressure, etc. in different process links. Whether it is large-scale production or small-scale testing, the system can provide appropriate hydrogen peroxide supply. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the whole structure of the utility model;

[0017] Figure 2 It is a structure section side view schematic diagram of the utility model;

[0018] Figure 3 It is a structure section front view schematic diagram of the utility model;

[0019] Figure 4 It is a structure section rear view schematic diagram of the utility model;

[0020] Figure 5 It is a structure liquid alkali pressure stabilizing filter device schematic diagram of the utility model.

[0021] In the figure: 1, oxygen generator;2, hydrogen peroxide electrolysis production system;3, by alkali storage tank;4, alkaline hydrogen peroxide storage tank;5, alkaline hydrogen peroxide outlet flow meter;6, alkaline hydrogen peroxide supply system;7, by alkali discharge pump;8, self-cleaning filter;9, alkaline hydrogen peroxide discharge pump;10, liquid alkali supply pipeline;11, liquid alkali pressure stabilizing filter device;12, energy storage equipment. Specific implementation

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0023] Please refer to Figure 1 - Figure 5 The utility model provides a kind of technical scheme: a kind of hydrogen peroxide supply device for wood pulp bleaching process includes oxygen generator 1.

[0024] In an embodiment of the utility model, hydrogen peroxide electrolysis production system 2, oxygen generator 1 is connected with hydrogen peroxide electrolysis production system 2, and the oxygen purity provided by oxygen generator 1 is above 93%, and is stably supplied to the cathode of hydrogen peroxide electrolysis production system 2, and the outer side of hydrogen peroxide electrolysis production system 2 is provided with alkaline hydrogen peroxide storage tank 4, and alkaline hydrogen peroxide storage tank 4 side is provided with vice alkali storage tank 3, and alkaline hydrogen peroxide storage tank 4 export pipeline is provided with alkaline hydrogen peroxide export flowmeter 5, and alkaline hydrogen peroxide export flowmeter 5 can monitor the flow data of alkaline hydrogen peroxide in real time, and data is transmitted to control system, to realize the accurate control to alkaline hydrogen peroxide supply, and alkaline hydrogen peroxide storage tank 4 is connected with alkaline hydrogen peroxide supply system 6, after oxygen generator 1 starts, high-purity oxygen such as 93% and above is generated, and oxygen is stably transported to the cathode of hydrogen peroxide electrolysis production system 2 through pipeline, and vice alkali is the product of anode, and the raw material of anode is liquid alkali transported through liquid alkali stable voltage filtration system;Alkaline hydrogen peroxide is generated in cathode reaction, and liquid alkali stable voltage filtration device 11 carries out stable voltage treatment to the liquid alkali transported to anode through liquid alkali supply pipeline 10, ensures that the liquid alkali pressure is stably in the appropriate range, and filters out the impurities in liquid alkali, prevents impurities from entering electrolysis system and affecting the reaction, in hydrogen peroxide electrolysis production system 2, when the cathode obtains oxygen, and the anode obtains pure and pressure-stable liquid alkali, under the action of stable direct current provided by rectifier power supply, electrolysis reaction occurs, and the liquid alkali of anode occurs oxidation reaction, and the water of cathode occurs reduction reaction in the presence of oxygen, and finally generates alkaline hydrogen peroxide containing certain concentration of hydrogen peroxide and sodium hydroxide, and the generated alkaline hydrogen peroxide is collected and stored in alkaline hydrogen peroxide storage tank 4, when needing to supply alkaline hydrogen peroxide to target position, alkaline hydrogen peroxide discharge pump 9 starts, it extracts the alkaline hydrogen peroxide in alkaline hydrogen peroxide storage tank 4, makes it enter supply pipeline, in the pipeline, the cooling water entering hydrogen peroxide electrolysis production system and the raw water entering water generator first pass through self-cleaning filter 8, and the filter element in filter can intercept the impurity particles in water, and can automatically clean filter element during operation, guaranteeing that the filtering effect is continuously stable, and energy storage device 12 can store the electric energy generated by wind energy, photovoltaic etc., and can also store low-price off-peak electricity, and supplies power to the wood pulp bleaching process hydrogen peroxide supply device in high-price peak electricity time period, which can effectively reduce the production energy consumption of hydrogen peroxide.

[0025] In an embodiment of the utility model, the secondary alkali storage tank 3 is fixedly connected with a secondary alkali discharge pump 7, the secondary alkali is generated at the anode position of the hydrogen peroxide electrolysis production system 2, is transported to the customer use end through the secondary alkali discharge pump 7 and is electrolyzed under the action of stable direct current to generate alkaline hydrogen peroxide, the alkaline hydrogen peroxide discharge pump 9 is arranged in the alkaline hydrogen peroxide supply system 6, according to the demand of target position to hydrogen peroxide, the rotating speed of alkaline hydrogen peroxide discharge pump 9 is adjusted through control system to realize accurate hydrogen peroxide supply, the alkaline hydrogen peroxide discharge pump 9 can stably transport alkaline hydrogen peroxide from the alkaline hydrogen peroxide storage tank 4 to the use end according to the demand of alkaline hydrogen peroxide supply system 6, and the conveying flow can be adjusted, the alkaline hydrogen peroxide storage tank 4 is connected with the alkaline hydrogen peroxide supply system 6, the liquid alkali supply pipeline 10 is arranged on the hydrogen peroxide electrolysis production system 2, the liquid alkali pressure stabilizing filter device 11 is arranged on the liquid alkali supply pipeline 10, in the supply system, the alkaline hydrogen peroxide outlet flowmeter 5 monitors the flow data of alkaline hydrogen peroxide in real time and transmits data to the control system, the control system accurately controls the supply amount of alkaline hydrogen peroxide according to the preset flow requirement or the actual demand of target position by adjusting the rotating speed of alkaline hydrogen peroxide discharge pump 9, so that it is stably supplied to the target position, such as the vertical pipe of paper pulp bleaching process link and is mixed with paper pulp.

[0026] Working principle: after the oxygen generator 1 is started, high-purity oxygen such as 93% or above is generated, the oxygen is stably transported to the cathode of the hydrogen peroxide electrolysis production system 2 through the pipeline, the pure water generated by the pure water machine is transported to the cathode of the hydrogen peroxide electrolysis production system 2, at the same time, the liquid alkali is transported to the anode of the hydrogen peroxide electrolysis production system 2 under the action of the liquid alkali pressure stabilizing filter 11. In the hydrogen peroxide electrolysis production system 2, when the cathode obtains oxygen and pure water, and the anode obtains pure and pressure-stable liquid alkali, under the action of stable direct current provided by the rectifier power supply, electrolysis reaction occurs, the liquid alkali at the anode undergoes oxidation reaction, and the water at the cathode undergoes reduction reaction in the presence of oxygen, and finally the generated alkaline hydrogen peroxide contains a certain concentration of hydrogen peroxide and sodium hydroxide. The generated alkaline hydrogen peroxide is collected and stored in the alkaline hydrogen peroxide storage tank 4, when it is needed to supply alkaline hydrogen peroxide to the target position, the alkaline hydrogen peroxide discharge pump 9 is started, which pumps out the alkaline hydrogen peroxide in the alkaline hydrogen peroxide storage tank 4, so that it enters the supply pipeline, the alkaline hydrogen peroxide outlet flowmeter 5 monitors the flow data of alkaline hydrogen peroxide in real time and transmits data to the control system, the control system accurately controls the supply amount of alkaline hydrogen peroxide according to the preset flow requirement or the actual demand of target position by adjusting the rotating speed of alkaline hydrogen peroxide discharge pump 9, so that it is stably supplied to the target position, such as the vertical pipe of paper pulp bleaching process link and is mixed with paper pulp.

[0027] The utility model has made the detailed description to the utility model generally above, but can make some modification or improvement to it on the basis of the utility model, and this is obvious to the general skilled person in the technical field. Therefore, the modification or improvement without departing from the utility model's thought spirit, all are within the utility model's protection scope.

Claims

1. A hydrogen peroxide supply device for wood pulp bleaching process, comprising an oxygen generator (1), characterized in that: a hydrogen peroxide electrolysis production system (2) is connected with the oxygen generator (1), an alkaline hydrogen peroxide storage tank (4) is arranged outside the hydrogen peroxide electrolysis production system (2), a side of the alkaline hydrogen peroxide storage tank (4) is provided with a secondary alkali storage tank (3), an alkaline hydrogen peroxide outlet flowmeter (5) is arranged on an outlet pipeline of the alkaline hydrogen peroxide storage tank (4), the alkaline hydrogen peroxide storage tank (4) is connected with an alkaline hydrogen peroxide supply system (6), a secondary alkali discharge pump (7) is fixedly connected on the secondary alkali storage tank (3), a self-cleaning filter (8) is connected with a pipeline of the hydrogen peroxide electrolysis production system (2), an alkaline hydrogen peroxide discharge pump (9) is arranged in the alkaline hydrogen peroxide supply system (6), a liquid alkali supply pipeline (10) is arranged on the hydrogen peroxide electrolysis production system (2), and a liquid alkali pressure stabilizing filtering device (11) is arranged on the liquid alkali supply pipeline (10). The oxygen generator (1) generates oxygen with a purity of 93% or above, which is stably supplied to a cathode of the hydrogen peroxide electrolysis production system (2).

2. A hydrogen peroxide supply device for a wood pulp bleaching process according to claim 1, characterized in that: The hydrogen peroxide electrolysis production system (2) receives liquid alkali from the liquid alkali pressure stabilizing filtering device (11) at an anode, and generates secondary alkali through electrolysis under the action of stable direct current.

3. A hydrogen peroxide supply device for wood pulp bleaching process according to claim 1, characterized in that: The alkaline hydrogen peroxide discharge pump (9) can deliver alkaline hydrogen peroxide from the alkaline hydrogen peroxide storage tank (4), and the delivery flow rate can be adjusted.

4. The hydrogen peroxide supply device for a wood pulp bleaching process according to claim 1, characterized in that: According to the demand for hydrogen peroxide at a target position, the speed of the alkaline hydrogen peroxide discharge pump (9) is adjusted through a control system to realize accurate hydrogen peroxide supply.

5. A hydrogen peroxide supply device for wood pulp bleaching process according to claim 1, characterized in that: The alkaline hydrogen peroxide outlet flowmeter (5) can monitor the flow data of alkaline hydrogen peroxide in real time, and transmit the data to a control system to realize accurate control of alkaline hydrogen peroxide supply.

6. A hydrogen peroxide supply device for wood pulp bleaching process according to claim 1, characterized in that: The oxygen generator (1) is connected with an energy storage device (12), the energy storage device (12) stores wind energy, photovoltaic generated electric energy and low-price valley electricity generated electric energy, and supplies electricity to the hydrogen peroxide supply device, which can effectively reduce the production energy consumption of hydrogen peroxide.

7. A hydrogen peroxide supply device for wood pulp bleaching process according to claim 1, characterized in that: ​

Images