JPS62112952A - Hot water production method - Google Patents

Abstract

PURPOSE:To easily produce hot water without generating noises or vibrations, by a method wherein a steam filtered through a hollow yarn module comprising a multiplicity of hollow yarn form microfilter membranes firmly bundled at least one end thereof is brought into contact with water. CONSTITUTION:A multiplicity of hollow yarn form membranes 2 are bundled, both ends thereof are fixed by a heat-resistant sealing agent 20, 20', and a port 21 fitted to the adhered end part 20 on one side in an airtight state is connected to a steam piping 13, while the adhered end part 20' on the other side is sealed by a sealing agent. The steam piping 3 and a membrane module enclosing the hollow yarn form membranes 2 connected to the pipe 3 are placed in a water tank 1. A steam is supplied through the steam piping 3 to heat the water contained in the tank 1. The steam penetrates through the membranes 2 to make contact with water at the surfaces of the membranes, and is dissolved and condensed to thereby directly heat the water. When a temperature-detecting end 5 is provided in the tank 1, while a temperature-regulating valve 4 is disposed in the steam piping 3 and a temperature-controlling part 6 is provided therebetween, the hot water obtained can be controlled to a fixed temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing hot water using steam, and particularly to a method suitable for producing nipyrodiene-free hot water at low cost and in large quantities.

(Conventional technology) As a conventional method for producing hot water using system steam, (1) V
Two methods are known: indirect method (2) using an L-and-tube or plate heat exchanger, and direct method (2) in which steam is blown directly into water.

Of the two, the indirect type is generally known, but since energy costs have become a problem in recent years, the direct type has been attracting more and more attention due to its high efficiency.

(Problem that the invention attempts to solve) This direct method has the following features.

(1) 100% of the thermal calories of steam are absorbed by water, and no condensed water is produced.

(2) Accurate temperature control is possible because heat conduction to the water occurs almost instantaneously. (3) There is no reduction in thermal efficiency due to scale generation as with indirect methods, and the installation area is small. However, this method Since steam is brought into direct contact with water, foreign substances contained in the steam may mix into the water, contaminating the water, or the steam may not dissolve into the water immediately, causing the bubbles in the steam to condense and form large bubbles. Unfortunately, this had the problem of bursting when compressed, causing impact noise and vibration.

(Means for Solving the Problems) The inventors of the present invention have made extensive studies to solve the above-mentioned problems of the direct method, and unexpectedly found that when steam is supplied to a hollow fiber module immersed in water and filtered, noise is generated. They found that no vibrations or vibrations occur at all, and as a result of further study, they arrived at the present invention.

That is, the present invention is a hot water production method characterized by bringing water into contact with steam filtered through a hollow fiber module in which at least one end of a large number of hollow fiber ultra-fine filtration membranes is fixed in a focused manner.

(f! River) According to the present invention, by bringing the steam filtered through the hollow fiber ultra-fine filtration membrane into contact with water as described above, hot water can be easily heated without generating noise or vibration as shown in the embodiment. ,
In particular, the effect of producing pyrogen-free hot water is obtained, but such an effect is completely unpredictable from conventional knowledge.

The reason for this effect is not clear, but because the steam is dispersed and ejected from each of the many micropores of the ultra-precise filtration membrane, the steam that has passed through the membrane is immediately dissolved in the water, causing the steam bubbles to disappear. It is presumed that the impact noise and vibrations caused by the explosion can be prevented.

(Example) Next, a hollow fiber module suitable for implementing the method of the present invention and a synutem using the module will be explained with reference to the drawings. Figures 1 to 3 are cross-sectional views of hollow fiber modules. Figure 1 shows a large number of hollow fiber membranes 2 bundled together, both ends of which are fixed using heat-resistant sealant 20°20', and one adhesive An example of a membrane module is shown in which a boat 21 airtightly attached to an end 20 is connected to a steam pipe 13, while the other bonded end 20/is sealed with a sealant.

Figure 2 shows a large number of hollow fiber membranes 2 bundled together, with a U
It is bent into a shape, and heat-resistant sealant 2 is applied on both ends at the same time.
2 shows an example of a membrane module that is fixed using 0 and connected to the steam pipe 13 via a boat 21.

FIG. 3 shows a large number of bundled hollow fiber membranes 2, both ends of which are fixed using a heat-resistant sealant 20, 20', integrally molded with the housing 11, and bows (21.
21' is connected to the water pipe 17 and the hot water pipe 1B, and the steam inlet 22 provided in the housing is connected to the steam pipe 13, thereby showing an example of a nine-membrane module.

The hollow fiber ultra-precise filtration membrane 2 used in the present invention is an ultrafiltration membrane with a pore size of several tens to several hundreds of times, or an ultrafiltration membrane of several hundreds to several hundred times.
It is a precision filtration membrane of several 1000X, and the water permeability is usually 100
0VmL1000V/am” or more, porosity 10-70
% ultra-precise filtration membrane is used. Further, it is necessary to have a sufficient membrane area for the steam flow rate. The membrane area can be appropriately selected depending on the pore diameter and porosity of the membrane, and the flow rate of steam.

Ultrafiltration membranes can remove not only particulates but also pyrogenes, so if the water to be heated is pyrogen-free, it can be heated without reducing its purity. Therefore, it becomes possible to produce pyrogen-free hot water at low cost with a compact device.

The material for the ultra-precise filtration membrane may be any material as long as it can withstand the pressure and temperature of the steam used, and in addition to organic polymers such as polyimide, polyamide, and polyamideimide, glass,
Specific examples include inorganic materials such as ceramic carbon.

Among them, polysulfone and polyimide are preferred.

The heat-resistant sealant 20, 20' may be one that is heat resistant and has little elution, such as imidazo-μ hardened Epoquin resin or acid anhydride hardened Epoquin resin with a Vyoar D hardness of 70 or more at 100°C. etc. are preferably used.

When a hollow fiber bundle is bundled and fixed with a heat-resistant F-A/agent, a heat-resistant sheet material having the elasticity and flexibility shown in Utility Model Publication No. 176/1983 is used to attach a hollow fiber bundle near the adhesive end. By surrounding the outer edge of the fiber bundle, damage to the hollow fibers at the outer edge can be prevented. Examples of the heat-resistant sheet material surrounding the bonded end of the hollow fiber bundle include nitrile rubber, isoprene rubber, chloroprene rubber, neoprene rubber, natural rubber, polyurethane, and silicone.

In carrying out the present invention, it is preferable to use steam at a pressure of 2 kg/am''a or less and a temperature of 150° C. or less, taking into account the material of the hollow fibers.

As a method of obtaining hot water using the above hollow fiber module,
Specifically, (+) a method in which a membrane module shown in FIG. 1 or 2 is installed inside a water tank storing water and the water is brought into contact with the steam that has passed through the membrane; Examples include a method in which a membrane and a housing are integrally molded, and water continuously supplied into the housing is brought into continuous contact with steam that has passed through the membrane.

FIG. 4 is a system diagram when hot water is obtained according to the method (1) above, in which a membrane module containing a steam pipe 3 and a hollow fiber membrane 2 connected thereto is installed in a water tank 1. Steam is supplied from a steam pipe 3 to raise the temperature of water in the tank. The steam passes through the membrane 2, comes into contact with water on the membrane surface, dissolves and condenses, and directly externally heats the water. Note that hot water can be controlled to a constant temperature by installing a temperature detection end 5 in the tank, installing a temperature control valve 4 in the steam pipe, and installing a temperature control section 6 between them.

FIG. 5 is a system diagram when hot water is obtained according to the method (11) above, in which the membrane module shown in FIG. Water pipe 1 at the water inlet
7 is connected. Hot water is produced within the housing by supplying steam from the steam pipe 13 and water from the water pipe 17 at the same time, and hot water is continuously supplied from the hot water pipe 18 connected to the hot water outlet provided on the side wall of the housing. You can get it. In addition, by installing a temperature detection end 15 near the hot water outlet of the housing, installing a temperature control valve 14 interlocked with this detection end in the steam piping, and installing a temperature control unit 16 between them, the hot water can be kept at a constant temperature. can be controlled.

Figure 6 also shows the above (1) using the membrane module shown in Figure 3.
6 is a system diagram for obtaining hot water according to the method of FIG. 6, in which the hollow fiber membrane 2 shown in FIG. is connected. Steam piping 13
Steam is supplied from the pipe 17, and at the same time water is supplied from the water pipe 17.

Steam permeates from the outside to the inside of the membrane t-2, the water temperature inside the membrane is warmed at the inlet, and hot water can be continuously obtained at the outlet. In addition, the temperature detection end 15 is connected to the hot water pipe 18.
and a temperature control valve 14 in the steam piping.
By installing a temperature control section 16 between them, it is possible to control the hot water to a constant temperature.

The present invention will be explained in more detail below by way of examples.

Example 1 Experiments were conducted according to the systematic diagram shown in FIG.

Pyrogen-free level water with water temperature 30℃ 17
JP 58-114702 at the bottom of the water tank storing 01
A hollow fiber ultrafiltration membrane made of polysulfone (membrane area: 3.5 mm) obtained according to Example 1 of the above issue was installed, and a pressure of 1.2 mm was installed.
kglom"G of steam was supplied at a flow rate of 20 kg/Hr. As a result, the temperature of the water in the water tank rose to 60°C 4 hours after the start of operation. During operation, there was no noise such as humming and no noise. In addition, the initial pyrogen-free level μ of water quality could be maintained until the end of the operation.

Example 2 An experiment was conducted according to FIG. Embodiment 1 of JP-A No. 58-91822, in which water (having a temperature of 1130° C. and a pyrogen-free level) was supplied from the water pipe 17 to the housing 11 at a flow rate of 380 e7Hr, and installed in the housing. A pressure of 1.2 kgl was applied to a hollow fiber precision filtration membrane made of polynulfone (membrane area: 3.5 mm) obtained according to the method of
Steam at a flow rate of 20 kg/Hr was supplied through the test steam pipe 13.
It was possible to continuously produce hot water of 8 to 0 degrees Celsius at a flow rate of 400 degrees Celsius. During operation, there was no IIF such as hammering, and water quality could be maintained until the end of operation using the initial pyrogen-free repeller.

(Effects) As described above, the method of the present invention can easily produce drought conditions without generating noise or vibration. In addition, when an ultrafiltration membrane is used as a hollow fiber, pyrogen-free hot water can be easily produced, so it is particularly useful for producing hot water in fields that require high-level cleaning such as medical parts, or in the food field.

[Brief explanation of drawings]

1 to 3 are cross-sectional views of a hollow fiber module suitable for carrying out the method of the present invention, and FIGS. 4 to 6 are flow diagrams of a system using the hollow fiber module described above. (2)...Hollow fiber membrane Ql)...
・Housing a4...Steam piping Q7)
・・・・・・Water piping (to)・・・Hot water piping

Claims (1)

[Claims] A hot water production method characterized by bringing water into contact with steam filtered through a hollow fiber module in which at least one end of a large number of hollow fiber ultra-precise filtration membranes is fixed in a focused manner.