Coffee tools and equipment
Coffee has become a complete industry, and different industries have been derived, such as machinery industry, packaging material industry, beverage industry, home appliance industry, coffee appliance industry, etc.
So you can see coffee tool and accessory includes coffee packing machine, coffee maker, vending machine, roasting machine, coffee bag filter paper, coffee mate and coffee related products.
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Coffee tools include many utensils and ancillary items used to make, brew, and enjoy coffee. Here are some basic classifications of coffee tools:
Coffee machine: Coffee machine is the core equipment for making coffee. According to its working principle and function, it can be divided into the following types:
Pour-over coffee machine: A pour-over coffee machine is a simple coffee-making appliance that brews ground coffee by manually controlling the flow and volume of hot water.
Drip coffee machine: A drip coffee machine pours hot water evenly on the coffee powder to extract the ingredients in the coffee powder to form coffee liquid, and then drips the coffee liquid into the cup through the drip filter principle.
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Filter coffee machine: A filter coffee machine puts coffee powder into filter cloth or filter paper, and then pours hot water evenly on the coffee powder through pressurization to extract the ingredients in the coffee powder to form coffee liquid, and then filter the coffee liquid through filter cloth or filter paper.
Espresso machine: An espresso machine uses high-pressure steam to pass through coffee powder to extract the ingredients in the coffee powder to form a thick coffee liquid, which is then sprayed into the cup through a high-pressure nozzle.
Coffee brewer: A coffee brewer is a tool used to brew coffee manually. You can put coffee powder inside, add hot water, and extract the ingredients in the coffee powder by stirring and soaking.
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Coffee grinder: A coffee grinder is a tool used to grind coffee beans. It can be divided into the following types according to its degree of grinding and how it is used:
Hand Grinder: A hand grinder is a simple grinder that grinds coffee beans by manually rotating a burr.
Electric grinding tools: Electric grinding tools are electric grinding tools that can control the grinding degree by adjusting the knob.
Mortar and Pestle: A mortar and pestle is a traditional grinding tool that places coffee beans in a mortar and grinds them repeatedly with a pestle.
Coffee tool manufacturer and supplier in China: Frech press coffee maker, Moka coffee maker, coffee filter, etc.
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Automatic coffee vending machine for hanging ear drip coffee bag
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Detail
A nitrogen generator is a device that uses air as a raw material and uses physical methods to separate oxygen and nitrogen in it to obtain nitrogen. Nitrogen generators used in industry can be divided into three types according to different classification methods, namely, cryogenic air separation method, molecular sieve air separation method (PSA) and membrane air separation method.
The nitrogen generator is a nitrogen production equipment designed and manufactured according to the pressure swing adsorption technology. The nitrogen generator uses high-quality imported carbon molecular sieve (CMS) as the adsorbent, and adopts the principle of pressure swing adsorption (PSA) at room temperature to separate air to produce high-purity nitrogen. Usually two adsorption towers are connected in parallel, and the imported PLC controls the automatic operation of the imported pneumatic valve to alternately perform pressurized adsorption and decompressed regeneration to complete the separation of nitrogen and oxygen to obtain the required high-purity nitrogen.
Working principle of nitrogen generator:
PSA pressure swing adsorption nitrogen production principle
Carbon molecular sieve can adsorb oxygen and nitrogen in the air at the same time, and its adsorption capacity increases with the increase of pressure, and there is no obvious difference in the equilibrium adsorption capacity of oxygen and nitrogen under the same pressure. Therefore, it is difficult to achieve effective separation of oxygen and nitrogen only by changing the pressure. If the adsorption rate is further considered, the adsorption characteristics of oxygen and nitrogen can be effectively distinguished. Oxygen molecules are smaller in diameter than nitrogen molecules, so the diffusion rate is hundreds of times faster than that of nitrogen, so carbon molecular sieves also absorb oxygen very quickly, reaching more than 90% in about 1 minute; while the adsorption amount of nitrogen is only 5% at this time So at this time, the adsorption is mostly oxygen, and the rest is mostly nitrogen. In this way, if the adsorption time is controlled within 1 minute, oxygen and nitrogen can be initially separated, that is to say, adsorption and desorption are achieved by pressure difference, adsorption when the pressure rises, and desorption when the pressure drops. The difference between oxygen and nitrogen depends on the speed difference between the two, which is realized by controlling the adsorption time. If the time is controlled to be very short, the oxygen has been fully adsorbed, and the adsorption process is stopped before the nitrogen can be adsorbed in the future. Therefore, pressure swing adsorption nitrogen production must have a pressure change, and the time must be controlled within 1 minute.
Principle of Cryogenic Air Separation Nitrogen Production
Cryogenic nitrogen production can not only produce nitrogen but also liquid nitrogen, which meets the process requirements of liquid nitrogen, and can be stored in liquid nitrogen storage tanks. When there is intermittent nitrogen load or minor repair of air separation equipment, the liquid nitrogen in the storage tank After entering the vaporizer and being heated, it is sent into the product nitrogen pipeline to meet the nitrogen demand of the process unit. The operating cycle of cryogenic nitrogen production (referring to the interval between two major heatings) is generally more than 1 year. Therefore, cryogenic nitrogen production generally does not consider backup. However, pressure swing adsorption nitrogen production can only produce nitrogen gas, there is no backup means, and a single set of equipment cannot guarantee continuous long-term operation.
Principle of membrane air separation nitrogen production
The air enters the polymer membrane filter after being compressed and filtered by the compressor. Due to the different solubility and diffusion coefficient of various gases in the membrane, the relative permeation rate of different gases in the membrane is different. According to this characteristic, various gases can be divided into "fast gas" and "slow gas".
When the mixed gas is under the action of the pressure difference on both sides of the membrane, the gas with a relatively fast permeation rate, such as water, hydrogen, helium, hydrogen sulfide, carbon dioxide, etc., will be enriched on the permeation side of the membrane after passing through the membrane, while the permeation rate is relatively high. Slower gases, such as methane, nitrogen, carbon monoxide and argon, are trapped on the side of the membrane to be enriched, so as to achieve the purpose of separation of mixed gases.
Main classification of nitrogen generator
Cryogenic Air Separation Nitrogen
Cryogenic air separation nitrogen production is a traditional nitrogen production method with a history of nearly several decades. It uses air as raw material, after compression, purification, and then using heat exchange to liquefy the air into liquid air. Air Liquide is mainly a mixture of liquid oxygen and liquid nitrogen. Taking advantage of the different boiling points of liquid oxygen and liquid nitrogen (at 1 atmosphere, the former has a boiling point of -183°C and the latter is -196°C), through liquid air rectification , to separate them to obtain nitrogen. Cryogenic air separation nitrogen production equipment is complex, occupies a large area, has high infrastructure costs, a large one-time investment in equipment, high operating costs, slow gas production: 12-24 hours, high installation requirements, and a long cycle. Comprehensive equipment, installation and infrastructure factors, the equipment below 3500Nm3/h, the investment scale of the PSA unit of the same specification is 20% to 50% lower than that of the cryogenic air separation unit. Cryogenic air separation nitrogen plant is suitable for large-scale industrial nitrogen production, but medium and small-scale nitrogen production is uneconomical.
Molecular sieve air separation nitrogen production
Using air as raw material, using carbon molecular sieve as adsorbent, using the principle of pressure swing adsorption, using carbon molecular sieve to selectively adsorb oxygen and nitrogen to separate nitrogen and oxygen, is commonly known as PSA nitrogen production. This method is a new nitrogen production technology developed rapidly in the 1970s. Compared with the traditional nitrogen production method, it has the advantages of simple process flow, high degree of automation, fast gas production (15-30 minutes), low energy consumption, product purity can be adjusted in a wide range according to user needs, and convenient operation and maintenance. Low cost, strong device adaptability, etc., so it is quite competitive in the nitrogen production equipment below 1000Nm3/h, and is more and more popular with medium and small nitrogen users. PSA nitrogen production has become the first choice for medium and small nitrogen users method.
Membrane Air Separation Nitrogen Production
Using air as the raw material, under certain pressure conditions, oxygen and nitrogen are separated by utilizing the different permeation rates of gases with different properties such as oxygen and nitrogen in the membrane. Compared with other nitrogen-generating equipment, it has the advantages of simpler structure, smaller volume, no switching valve, less maintenance, faster gas production (≤3 minutes), and convenient capacity expansion. It is especially suitable for nitrogen purity ≤ 98% of medium and small nitrogen users have the best performance-price ratio. When the nitrogen purity is above 98%, its price is more than 15% higher than that of the PSA nitrogen generator of the same specification.
Features of nitrogen generator equipment:
(1) Convenient and quick nitrogen production:
Advanced technology and a unique air distributor make the air distribution more uniform and efficiently use carbon molecular sieves to provide qualified nitrogen in about 20 minutes.
(2) Easy to use:
The equipment is compact in structure, skid-mounted as a whole, occupies a small area and does not require infrastructure investment, and the investment is small. Nitrogen can be produced on site only by connecting the power supply.
(3) More economical than other nitrogen supply methods:
The PSA process is a simple nitrogen production method, which uses air as the raw material, and the energy consumption is only the electric energy consumed by the air compressor. It has the advantages of low operating cost, low energy consumption, and high efficiency.
(4) Mechatronics design realizes automatic operation:
Imported PLC controls fully automatic operation, nitrogen flow pressure and purity can be adjusted and displayed continuously, enabling unattended operation.
(5) Wide range of applications:
Protective gas in metal heat treatment process, gas used in chemical industry production and nitrogen-filled purification of various storage tanks and pipelines, gas used in the production of rubber and plastic products, oxygen-exhausting and fresh-keeping packaging in the food industry, purification and covering gas in the beverage industry, filling gas in the pharmaceutical industry Nitrogen filling and oxygen exhausting of nitrogen packaging and containers, protective gas for electronic components and semiconductor production processes in the electronics industry, etc. The purity, flow and pressure are stable and adjustable to meet the needs of different customers.
Technical indicators of nitrogen generator:
Flow: 5-1000Nm3/h
Purity: 95%-99.9995%
Dew point: ≤-40℃
Pressure: ≤0.8Mpa adjustable
Nitrogen purity of nitrogen generator
Purity is an important technical parameter of gases. Taking nitrogen as an example, according to the purity of national standard nitrogen, it can be divided into three grades: industrial nitrogen, pure nitrogen and high-purity nitrogen. 99.999% (O2 less than or equal to 0.001%).
flow, volume flow, mass flow
The flow rate refers to the amount of gas passing through any cross-section per unit time during the gas flow process. There are two ways to express flow, namely volume flow and mass flow. The former refers to the volume of gas passing through any section of the pipeline, and the latter refers to the mass of gas passing through. In the gas industry, the volumetric flow rate is generally used in m3/h (or L/H) as the unit of measurement. Because the volume of gas is related to temperature, pressure and humidity, for the convenience of comparison, the volume flow rate usually referred to refers to the standard state (temperature is 20°C, pressure is 0.101MPa, relative humidity is 65%), and the flow rate at this time is expressed in Nm3 /h is the unit, "N" means the standard state.
Air is compressible, and the air after the air compressor does mechanical work to reduce its volume and increase its pressure is called compressed air. Compressed air contains many impurities:
1. Water, including water mist, water vapor, and condensed water;
2. Oil: including oil stains and oil vapor;
3. Various solid substances such as: rust mud, metal powder, rubber powder, tar particles, filter materials, fine powder of sealing materials, etc.; in addition, there are many harmful chemical odor substances, etc. Water vapor in compressed air can be removed by pressurization, cooling, adsorption and other methods. Liquid moisture can be removed by heating, filtration, mechanical separation, etc.
Adsorption is the selective concentration of one or more components in a gas on the surface of a porous solid. The adsorbed component is called an adsorption medium, and the porous solid is called an adsorbent. The connection force between the adsorbent and the adsorption medium is a chemical bond, and the analysis of the adsorption medium depends on raising the temperature or reducing the partial pressure of the component in the air pressure. Another situation is when the adsorption component dechemically reacts with the solid adsorbent, which is called chemisorption, and chemisorption generally cannot be regenerated.
Membrane permeation refers to the separation of gases by polymers during gas purification based on the selective permeation of one or more gas components from one side of the membrane to the other. The component dissolves on the surface of the polymer membrane and is transported across the membrane to form a concentration differential that maintains a higher partial pressure of the component on one side of the membrane than on the other side of the membrane.