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INVENTION
Russian Federation Patent RU2254515

METHOD FOR IMPROVING THE QUALITY OF ISOLATION heat conductor

Name of the inventor: Isaev VV (RU); Artamonov NA (RU); Udachin OV (RU)
The name of the patentee: Russian Correspondence Institute of Textile and Light Industry (RosZITLP) (RU)
Address for correspondence: 123298, Moscow, ul. People's Militia, 38, building 2, RosZITLP, Department of Thermal Engineering, VV Isayev
Starting date of the patent: 2003.09.08

The invention relates to the field of thermal insulation. Exterior waterproofing protective coating adhesion associated with secondary insulation fibrous-porous layer is manufactured by partial, controlled by the depth of infiltration of its connection with the subsequent hardening and the formation of fiber reinforced plastic middle layer. The technical result is to increase the operational reliability, heat engineering efficiency and service life of the entire composite insulation.

DESCRIPTION OF THE INVENTION

The invention relates to a method for improving the quality of thermal insulation of pipelines and can be used to increase the reliability, efficiency and service life of heating pipeline engineering enterprises and housing and communal services (HCS).

There is a method of isolation of a heat conductor comprising a heat-pipe based on penopolimermineralnoy with dense inner and outer crusts with insulating middle layer. adhesively interconnected and insulated pipe while teplogidroizolyatsionnaya shell is made thin enough for water vapor permeability (RU 2115058 C1, 10.07.98, at Bul. №19).

The closest technical solution to the proposed method is the thermal insulation of pipelines of heating networks, consisting of a heat-insulating layer and a protective coating. Effective thermal insulation products for the laid in channels heat network pipelines are cylinders of mineral wool and fiberglass. In the methods of thermal insulation of underground pipelines laying channel, taking into account the possible contamination in the design of the drip-liquid water, it is recommended to use only water-repellent thermal insulation materials. To limit the moisture fibrous insulation with above-ground and underground channel laying on thermal insulation layer is installed protective coating of waterproofing materials. In domestic practice in the construction of a mineral wool and glass wool insulators for laying in ducts used fiberglass, plastic films, plasters, etc. (See. "Energy", 2002, №5, s.43-45).

The disadvantage of these methods is the penetration of moisture into the applicable composite insulation, which leads to deterioration of the insulation due to a significant increase in thermal conductivity when wet impregnation and secondary insulating fibrous-porous layer of moisture and, consequently, the need to provide the use of a greater computational insulation thickness to avoid excessive heat loss. Penetration of moisture into the insulation and lead to corrosion of the pipe and reduction in the life of the assembly.

The technical result of the proposed ways to improve the quality of thermal insulation is to improve the efficiency, reliability and life of the thermal insulation of a heat conductor service.

This result is achieved by the fact that excludes the penetration of moisture into the structure through the use of an external waterproofing layer, adhesively bonded with an average insulating layer, by partial impregnation adjustable depth of his binder (resin), followed by polymerization (hardening) and the formation of reinforced plastic middle layer of fibers required thickness and mechanical properties to ensure integrity, integrity and dimensional stability of the whole composition, but also having sufficient resistance to mechanical damage, heat resistance, impact modes and operating conditions, and preserve these properties as much as possible for a long time (due to the use of specific products binders) that provides the results.

A study (simulation) specific heat loss Q (W / m) through the outer surface of 1 m in length, insulated three-layer insulation pipeline with a variation of a number of factors, among which should be noted in particular: the outer diameter of the steel pipe D ₁ (the M), heat Pipeline Mode external diameters and thermal conductivities of the three layers of insulation D _2, D _3, D _{4, 1 2 3,} respectively, the outer waterproof layer thickness _Guide (mm), and others. factors. Below is an example of the present study in the form of tables and graphics for the spatial dependence of the outer steel pipe diameter D = ₁ 120 mm with a thickness variation of the outer protective layer of waterproofing _guide in the range of 2 mm to 20 mm. The variable thickness of the outer protective layer of the waterproofing is obtained by increasing the depth of impregnating medium fiber-insulating porous layer and the bonding layer form a plastic, fiber reinforced insulating middle layer, after curing (see. Table 1). The drawing is a graphical spatial dependence of the specific heat pipe Q (W / m) of the thickness of the outer waterproof layer (Mm) and the average coefficient of thermal conductivity of fibrous-porous thermal insulation layer ₂ (W / m · K), from which it follows that there is an optimum range of the thickness of the outer waterproof layer (Mm) (average layer depth impregnation binder) providing specific heat loss Q <56 (W / m), which is in the range 4 < <14 mm, provided that the average time of impregnation and the impregnation speed.

As noted above, the optimum thickness of the waterproofing layer depends on a number of factors, among which are

Table 1
Initial and calculated data
	Q, W / m		K		GUIDE, mm		1 W / m K		2 W / m K		3 W / m K		D 1, m		D 2, m	D 3, m
1	63.615		0.203		2		0,800		0,065		0,800		0.120		0,130	0.226
2	56.478		0,180		4		0,800		0,055		0,750		0.120		0,130	0.222
3	51.531		0.164		6		0,800		0,048		0.720		0.120		0,130	0.218
4	50.158		0.160		8		0,800		0,045		0.710		0.120		0,130	0.214
5	51.775		, 0165		10		0,800		0,045		0,700		0.120		0,130	0.210
6	53.540		0.171		12		0,800		0,045		0,700		0.120		0,130	0.206
7	55.468		0.177		14		0,800		0,045		0,700		0.120		0,130	0.202
8	57.583		0.183		16		0,800		0,045		0,700		0.120		0,130	0.198
9	59.915		0.191		18		0,800		0,045		0,700		0.120		0,130	0.194
10	62.498		0.199		20		0,800		0,045		0,700		0.120		0,130	0.190
		D 4 m		D 2 / D 1		D 3 / D 2		D 4 / D 3		2		R 1		R 2	R 3	R 4
1		0.230		1,083		1,738		1,018		7.0		0,050		4,254	0,011	0,621
2		0.230		1,083		1,708		1,036		7.0		0,050		4.865	0,024	0,621
3		0.230		1,083		1,677		1,055		7.0		0,050		5,385	0,037	0,621
4		0.230		1,083		1,646		1,075		7.0		0,050		5.538	0,051	0,621
5		0.230		1,083		1,615		1,095		7.0		0,050		5,329	0,065	0,621
6		0.230		1,083		1,585		1,117		7.0		0,050		5,115	0,079	0,621
7		0.230		1,083		1,554		1,139		7.0		0,050		4,897	0.093	0,621
8		0.230		1,083		1,523		1,162		7.0		0,050		4.675	0.107	0,621
9		0.230		1,083		1,492		1,186		7.0		0,050		4,448	0.122	0,621
10		0.230		1,083		1,462		1,211		7.0		0,050		4.217	0.136	0,621

select diameter thermal insulation pipes, preserving and securing the necessary mechanical properties of the structure under the influence of a long time in different modes and operating conditions of a heat conductor, restrictions nominal overall piping size, obtaining the optimum thickness of the entire composite insulation and the outer protective layer and minimizing the equivalent thermal conductivity of the multi-layer composition, manufacturability like of the outer waterproof layer, and the entire construction, and others. factors and an average size of ~10% of the total insulation thickness.

2 is a diagram of the proposed structure of a heat conductor corresponding to the proposed method. heating pipeline design includes a pipe 1 with teplogidroizolyatsionnoy composition consisting of three insulation layers adhesively interconnected and insulated pipe in which the inner layer 2, adherent to the pipe, acts as a corrosion resistant coating, followed by middle insulating layer 3 based on the fibrous porous nonwoven the material of mineral wool or glass fibers, and then a protective layer of waterproofing material 4 is adhesively bonded to the middle layer by partially impregnating its binder, followed by polymerization (hardening) and the formation of plastic required thickness of fiber reinforced middle layer, in order to avoid hitting moisture into the composition, providing the necessary tightness, thermal stability, integrity and dimensional stability of the whole structure, having sufficient resistance to mechanical damage and exposure modes and the external operating conditions, and retains these properties as can longer time (through the use of specially formulated binder) that provides a increase the effectiveness, reliability and service life of the entire heat insulating structure. Evaluation of the optimum thickness of the waterproofing layer is carried out, depending on the variation of a number of factors: the diameter of the thermal insulation pipe, ensuring the necessary mechanical properties and save them under the influence of modes and external ambient conditions, ratings overall design size and technology of its manufacture, to optimize the thickness of the entire composite insulation and exterior waterproofing layer for minimizing the equivalent thermal conductivity of the insulation-layer standards to provide the specific heat losses from the surface of thermally insulated pipe (example of the present study cm. above), and others. factors. Rough estimate of the average value of the thickness is ~ 10% of the entire thickness of the insulation.

CLAIM

1. A method for improving the quality of thermal insulation comprising teplogidroizolyatsionnuyu composition consisting of three layers of insulation, such as the inner layer, adherent to the pipe, functioning as an anticorrosion coating, following such insulating middle layer of fibrous nonwoven fabric made of mineral wool or glass fiber and a protective coating of a waterproofing material, characterized in that the outer waterproof coating adhesively connected with the middle layer, is made adjustable by the depth of the middle layer of impregnation with a binder and subsequent polymerization to form a layer of plastic, reinforced fibers of the middle layer.

2. A method according to claim 1, characterized in that the depth impregnation medium binder layer at a controlled impregnation of 4 < <14 mm.

print version
Publication date 21.01.2007gg

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