阅读说明：本技术 一种节能麦汁煮沸方法和蒸汽回收设备 (Energy-saving wort boiling method and steam recovery equipment ) 是由 张晓辉 蔡少彬 杨青 张霞 郑文娜 于 2020-07-31 设计创作，主要内容包括：本发明提供一种节能麦汁煮沸方法和蒸汽回收设备,涉及啤酒酿造工艺。本发明的节能麦汁煮沸方法包括以下步骤：预热：用热水将麦汁预热至92～93℃,用蒸汽将麦汁蒸煮至温度为98±0.5℃；煮沸：用蒸汽加热麦汁至煮沸,煮沸后用恒定流速的蒸汽继续煮沸,恒定流速为每加热100m<Sup>3</Sup>麦汁蒸汽的流速3800～4500kg/h,煮沸时间持续50～60min,煮沸过程中持续产生二次蒸汽；蒸汽回收：将二次蒸汽输送至冷凝器与冷却水进行换热,冷却水被二次蒸汽加热,加热后的冷却水为回水,回水的温度控制为96～99℃,回水用于所述预热步骤中麦汁的预热。本发明的蒸汽回收设备可用于上述节能麦汁煮沸方法。本发明的煮沸方法可以保证煮沸质量,最大程度回收二次蒸汽,具有节能环保的优点。(The invention provides an energy-saving wort boiling method and steam recovery equipment, and relates to a beer brewing process. The energy-saving wort boiling method comprises the following steps: preheating: preheating the wort to 92-93 ℃ by using hot water, and cooking the wort to the temperature of 98 +/-0.5 ℃ by using steam; boiling: heating wort with steam until boiling, and further boiling with steam at constant flow rate of 100m per heating 3 The flow rate of wort steam is 3800-4500 kg/h, the boiling time lasts for 50-60 min, and secondary steam is continuously generated in the boiling process; and (3) steam recovery: and conveying secondary steam to a condenser to exchange heat with cooling water, heating the cooling water by the secondary steam, controlling the temperature of the return water to be 96-99 ℃, and using the return water for preheating wort in the preheating step. The steam recovery device can be used for the energy-saving wort boiling method. The boiling method of the invention can ensure the boiling quality and return to the maximum extentSecondary steam is collected, and the method has the advantages of energy conservation and environmental protection.)

1. An energy-saving wort boiling method is characterized by comprising the following steps:

preheating: preheating the wort to 92-93 ℃ by using hot water, and cooking the wort to the temperature of 98 +/-0.5 ℃ by using steam;

boiling: heating wort with steam to boil, and further boiling with steam at constant flow rate of 100m per heating³The flow rate of wort steam is 3800-4500 kg/h, the boiling time lasts for 50-60 min, and secondary steam is continuously generated in the boiling process;

and (3) steam recovery: and conveying the generated secondary steam to a condenser to exchange heat with cooling water, condensing the secondary steam to form condensate water, heating the cooling water by the secondary steam, controlling the temperature of the return water to be 96-99 ℃, and preheating the wort by the return water in the preheating step.

2. The energy-saving wort boiling method according to claim 1, wherein in the preheating step, the wort is boiled to 98 ℃ with steam.

3. The energy-saving wort boiling method according to claim 1, wherein in the boiling step, the boiling is performed at a rate of 100m per heating³The flow rate of wort steam was 4000 kg/h.

4. The energy-saving wort boiling method according to any one of claims 1 to 3, wherein the temperature of the returned water in the steam recovery step is 97 ℃.

5. A steam recovery plant for use in the energy-saving wort boiling method according to any one of claims 1 to 4, comprising:

the boiling device comprises a boiling pot and an inner heater, wherein the inner heater is arranged in the boiling pot and used for heating wort, a fluid director is arranged at an outlet of the inner heater and used for guiding and spraying the boiling wort to the pot wall of the boiling pot;

the condenser comprises a steam channel and a cooling water channel, an inlet of the steam channel is connected with an outlet of the boiling pot, and secondary steam and volatile substances generated in the boiling pot enter the condenser to be condensed to form condensed water;

the water return device comprises a low-temperature energy storage tank and a high-temperature energy storage tank; the bottom of the low-temperature energy storage tank is connected with an inlet of the cooling water channel to provide cooling water for the condenser; the top of the high-temperature energy storage tank is connected with an outlet of the cooling water channel, so that the cooling water heated in the condenser enters the high-temperature energy storage tank; the bottom of the high-temperature energy storage tank is connected with the top of the low-temperature energy storage tank;

the wort preheating device comprises a wort channel and a heating water channel, wherein wort to be preheated is preheated through the wort channel, and heating water is cooled through the heating water channel; the inlet of the heating water channel is connected with the top of the high-temperature energy storage tank, the high-temperature energy storage tank provides heating water for the wort preheating device, and the outlet of the heating water channel is connected with the condenser.

6. The steam recovery device of claim 5, wherein the internal heater is a tubular heater, the number of the tubular heater is 250-260, the aperture DN56 of the tubular heater is, and the height of the tubular heater is 2000-2200 mm.

7. The steam recovery apparatus according to claim 5, wherein a return water temperature probe is provided at an outlet of the cooling water passage of the condenser for detecting a temperature of the heated cooling water.

8. The vapor recovery apparatus according to claim 5, wherein an outlet of the vapor passage of the condenser is provided with a drain pipe, and the drain pipe is provided with a drain valve.

9. The steam recovery device of claim 5, wherein a heat energy recovery pump is arranged on an inlet pipeline of the cooling water channel of the condenser, a heat energy using pump is arranged on a pipeline between the high-temperature energy storage tank and the wort preheating device, and a wort preheating pump is arranged on an inlet pipeline of the wort channel.

10. The steam recovery equipment according to any one of claims 5 to 8, wherein a water-sealed tank is connected to a branch of an outlet of the boiling device, an exhaust pipe is arranged on the water-sealed tank, one end of the exhaust pipe extends into the water storage tank in the water-sealed tank, and the other end of the exhaust pipe is connected with the atmosphere.

Technical Field

The invention relates to a beer brewing process, in particular to an energy-saving wort boiling method and steam recovery equipment.

Background

Wort boiling is an important step in a beer saccharification section, has a plurality of functions of removing hot coagula, shaping wort and the like, and plays a key role in beer flavor and stability. Wort boiling is the process with the largest steam consumption in the beer brewing process, and the steam for boiling accounts for more than one third of the total steam used by beer enterprises. At present, the wort boiling process of a brewery basically controls steam according to the opening of a steam valve or the steam pressure, the two boiling processes are influenced by the fluctuation of the steam pressure, the steam flow in the boiling process is unstable, the total steam consumption is also unstable, the boiling strength is unstable, the consistency control of the quality is not facilitated on the one hand, and the steam waste is easily caused due to the unstable steam pressure on the other hand.

At present, the normal pressure or low pressure boiling generally divides the boiling process into several stages, which are generally divided into front boiling, middle soft boiling and rear large boiling. The large boiling of the latter stage produces a large amount of secondary steam. Many beer enterprises still adopt the mode of high-intensity boiling, and a large amount of secondary steam that produces can't be retrieved, leads to the extravagant condition of secondary steam to be more serious. Therefore, it is very important and urgent to find a boiling method that can balance the use of steam and the recovery of secondary steam, thereby avoiding the waste of steam and simultaneously ensuring the stable quality and consistent taste and flavor of beer.

Disclosure of Invention

Therefore, in order to solve the above problems, there is a need to provide an energy-saving wort boiling method, which can control the flow rate of steam to be constant in the boiling stage, ensure the wort boiling quality, generate stable and continuous secondary steam for wort, ensure the secondary steam to be basically and completely recovered, and reduce the steam consumption in the boiling process.

An energy-saving wort boiling method comprises the following steps:

preheating: preheating the wort to 92-93 ℃ by using hot water, and cooking the wort to the temperature of 98 +/-0.5 ℃ by using steam;

boiling: heating wort with steam to boil, and further boiling with steam at constant flow rate of 100m per heating³The flow rate of wort steam is 3800-4500 kg/h, the boiling time lasts for 50-60 min, and secondary steam is continuously generated in the boiling process;

and (3) steam recovery: and conveying the generated secondary steam to a condenser to exchange heat with cooling water, condensing the secondary steam to form condensate water, heating the cooling water by the secondary steam, controlling the temperature of the return water to be 96-99 ℃, and preheating the wort by the return water in the preheating step.

According to the energy-saving wort boiling method, the wort to be preheated is preheated by the backwater in the wort preheating device, then the wort is rapidly heated to a state to be boiled, and then the wort is boiled by adopting the steam with a constant flow rate, so that stable and continuous secondary steam is generated when the wort is boiled, and the secondary steam is favorably and stably and balancedly recovered. The phenomenon that the return water temperature generated in the condenser is too low due to too low secondary steam flow at a certain stage, so that the preheating temperature of wort is not enough, and the steam consumption in the boiling process is increased indirectly is avoided; the waste of the secondary steam caused by the fact that the flow of the secondary steam is too high to exceed the heat energy recovery load of the condenser and the water return device at a certain stage can be avoided. The inventors have found that by adjusting the flow rate of steam and the return water temperature during the boiling stage, the generation and recycling of secondary steam can be maintained in a balanced state, and the boiling method of the present invention can satisfy the following three criteria: firstly, the boiling quality is ensured, namely the stability index of the finished beer is ensured; secondly, the wort is continuously and stably sprayed out to form a continuous wort flow in the wort boiling process, and continuous and stable secondary steam is generated; thirdly, the generated secondary steam is stably recovered to form stable backwater. That is to say, not only can guarantee the quality that the wort was boiled, can also reduce the consumption of stage steam of boiling to furthest recycle secondary steam, reach energy-concerving and environment-protective effect.

In one embodiment, the pre-heating step is performed by steaming the wort to 98 ℃.

In one embodiment, the boiling step is performed at a rate of 100m per heating³The flow rate of wort steam was 4000 kg/h.

In one embodiment, the temperature of the return water in the steam recovery step is 97 ℃.

The invention also provides a steam recovery device for the energy-saving wort boiling method, which comprises the following steps:

the boiling device comprises a boiling pot and an inner heater, wherein the inner heater is arranged in the boiling pot and used for heating wort, a fluid director is arranged at an outlet of the inner heater and used for guiding and spraying the boiling wort to the pot wall of the boiling pot;

the condenser comprises a steam channel and a cooling water channel, an inlet of the steam channel is connected with an outlet of the boiling pot, and secondary steam and volatile substances generated in the boiling pot enter the condenser to be condensed to form condensed water;

the water return device comprises a low-temperature energy storage tank and a high-temperature energy storage tank; the bottom of the low-temperature energy storage tank is connected with an inlet of the cooling water channel to provide cooling water for the condenser; the top of the high-temperature energy storage tank is connected with an outlet of the cooling water channel, so that the cooling water heated in the condenser enters the high-temperature energy storage tank; the bottom of the high-temperature energy storage tank is connected with the top of the low-temperature energy storage tank;

the wort preheating device comprises a wort channel and a heating water channel, wherein wort to be preheated is preheated through the wort channel, and heating water is cooled through the heating water channel; the inlet of the heating water channel is connected with the top of the high-temperature energy storage tank, the high-temperature energy storage tank provides heating water for the wort preheating device, and the outlet of the heating water channel is connected with the condenser.

Above-mentioned steam recovery plant can input the steam of steady velocity of flow in the inner heater, makes to boil and produces stable, lasting secondary steam in the device, and the heat of secondary steam is retrieved in the condenser, and the cooling water that is heated (return water promptly) can be used for wheat juice to preheat, and the cold water that forms is used for secondary steam's cooling again, and the water route forms closed cycle, is favorable to stably, continuously retrieving, utilizes the heat of secondary steam to reduce the consumption of steam, reach energy-concerving and environment-protective effect.

In one embodiment, the internal heater is a tubular heater, the number of the tubular pipes in the tubular heater is 250-260, the aperture DN56 of the tubular pipes is, and the height of the tubular pipes is 2000-2200 mm. Preferably, the number of tubes is 253 and the height of the tubes is 2100 mm.

In one embodiment, a return water temperature probe is arranged at an outlet of the cooling water channel of the condenser and used for detecting the temperature of the heated cooling water.

In one embodiment, the outlet of the steam channel of the condenser is provided with a drain pipe, and the drain pipe is provided with a drain valve.

In one embodiment, a heat energy recovery pump is arranged on an inlet pipeline of a cooling water channel of the condenser, a heat energy using pump is arranged on a pipeline between the high-temperature energy storage tank and the wort preheating device, and a wort preheating pump is arranged on an inlet pipeline of the wort channel. The heat energy recovery pump is used for conveying cooling water to the condenser, and the heat energy uses the pump to be used for conveying the return water in the high temperature energy storage tank to the wort preheating device, and the wort preheating pump is used for conveying the wort to be preheated to the wort preheating device.

In one embodiment, a branch of the outlet of the boiling device is connected with a water-sealed tank, the water-sealed tank is provided with an exhaust pipe, one end of the exhaust pipe extends into the water storage tank in the water-sealed tank, and the other end of the exhaust pipe is connected with the atmosphere. The water seal tank keeps the water stored at a certain liquid level, so that the secondary steam can be effectively prevented from entering the atmosphere, the secondary steam is recovered as much as possible, and the waste is reduced.

Compared with the prior art, the invention has the following beneficial effects:

according to the energy-saving wort boiling method, the flow rate of steam and the return water temperature in the boiling stage are adjusted, so that the generation and recovery of secondary steam can be maintained in a balanced state, stable and continuous secondary steam is generated, the heat energy of the secondary steam is utilized to prepare return water, and the return water is used for preheating wort. The method of the invention can not only ensure the boiling quality without influencing the quality of the finished beer product, but also reduce the steam consumption in the boiling stage, and recycle the secondary steam to the maximum extent, thereby achieving the effects of energy saving and environmental protection.

The steam recovery equipment can be used for the wort boiling method, not only can reduce the steam consumption, but also can fully recover and utilize secondary steam generated in the boiling stage, thereby achieving the effects of energy conservation and environmental protection.

Drawings

FIG. 1 is a schematic structural view of a vapor recovery apparatus in an embodiment;

FIG. 2 is a schematic sectional view of a tube heat exchanger in the embodiment;

fig. 3 is a steam flow rate graph of steam valve opening control and flow rate control.

In the figure, 100, a boiling pan; 110. a shell and tube heat exchanger; 111. arranging pipes; 120. a fluid director; 200. a condenser; 210. a backwater temperature probe; 220. a drain valve; 300. sealing the tank with water; 310. an exhaust pipe; 320. an overflow pipe; 330. a high-low position probe; 410. a high temperature energy storage tank; 411. a temperature probe; 420. a low temperature energy storage tank; 500. a wort preheating device; 510. a wort preheating pump; 520. a wort temperature probe; 600. a heat recovery pump; 700. the heat energy uses a pump.

Detailed Description

To facilitate an understanding of the invention, a more complete description of the invention will be given below in terms of preferred embodiments. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.