CN105673058A - Method for adjusting temperature of incoming air flow in mine shallow tunnel - Google Patents

Abstract

The invention relates to the field of structural design, and discloses a method for adjusting temperature of an incoming air flow in a mine shallow tunnel, which comprises tunnel section design and section design evaluation; the method comprises the following steps of (1) utilizing a abandoned shallow tunnel of a mine to regulate and control the temperature of incoming air flow, and establishing a tunnel size expression required for regulating and controlling a certain air volume temperature; the quantitative regulation and control of the ground temperature effect of the mine shallow layer roadway on the temperature of the air inflow are realized, the regulation and control result of the temperature-regulating roadway on the air inflow is predicted, and the aim of ventilating, saving energy and reducing the temperature of the mine is fulfilled by precooling the air inflow of the mine by using the ground temperature in summer; in winter, the ground temperature is used for preheating the air inlet flow of the mine, so that the problem of icing of the air inlet shaft is solved.

Description

A kind of shallow-layer tunnel, mine regulates into distinguished and admirable temperature methods

Technical field

The present invention relates to field of structural design, particularly a kind of shallow-layer tunnel, mine regulates into distinguished and admirable temperature methods.

Background technology

China is that mineral products store big country, current domestic a considerable amount of metalliferous mine already close to or exceeded km, primitive rock temperature constantly increases, underground thermal pollution become mine industry must faced by geological hazards, meanwhile, the domestic winter severe cold of northern China, annual winter, a large amount of cold gas was directly entered down-hole, the phenomenons such as pit shaft icing, water pipe from freezing crack occur often, and life security and national wealth to workman cause serious threat.

For such a mineral products big country of China, if can effectively mine shallow earth resource be used, it will become China and develop an important support of Renewable energy policy. The present invention utilizes mine existing shallow-layer Abandoned Tunnel to become, with a frost difficult problem, the realistic problem that bargh is badly in need of solving as the underground thermal pollution of administering entering distinguished and admirable " thermoregulator " efficient energy-saving.

Summary of the invention

It is an object of the invention to provide a kind of shallow-layer tunnel, mine and regulate into distinguished and admirable temperature methods, mine shallow-layer Abandoned Tunnel is converted to mine and enters distinguished and admirable " thermoregulator ", carry out typical mine shallow earth effect and regulate and control into airflow temperature quantitative analysis, using discarded for mine top shallow-layer roadway as rock stratum and distinguished and admirable cold and hot swapace, be used for regulating mine and entering airflow temperature, improve down-hole high temperature in summer, winter the downcast icing phenomenon adverse effect to mining production.

For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the invention discloses a kind of shallow-layer tunnel, mine and regulate into distinguished and admirable temperature methods, method includes tunnel section design and Section Design assessment, tunnel section design concrete structure includes two parts, and Part I is the length of side is the square bottom of 2a, and Part II is radius is the Semicircular arched of a, Semicircular arched is arranged at square base top, and Section Design assessment includes parameter setting and Section Design proves two parts.

Wherein, Section Design is assessed, and concrete grammar is as follows:

Parameter setting: summer, mine surface temperature was T₁, it is assumed that the temperature in the tunnel that distinguished and admirable entrance takes is also for T₁, distinguished and admirable Qm required for existing getting working face³, and airflow temperature need to reach T ' (T ' > T₁), distinguished and admirable density p, wind speed v, specific heat capacity is Cp;

Section Design is proved: the distinguished and admirable time in the horizontal semicircular tunnel through length L isAnd the wind flow that in during this period of time, getting working face needs is Q; In the timeIn, the wind flow that the horizontal semicircular tunnel of length L flows through isTherefore,

$Q=2abL+\frac{1}{2}{\mathrm{\πa}}^{2}L;$

Distinguished and admirable from T₁Dropping to T', its heat reduced value is Q₁, its reduced value is exactly the distinguished and admirable heat dissipation capacity to country rock:

Q₁=c_pM Δ T=c_pρQ(T₁-T');

Tunnel carries out in heat exchanging process with distinguished and admirable, and its base plate is fewer with the distinguished and admirable heat carried out exchange, therefore only studies two sides and the top board in tunnel, and the area of its heat exchange is S, and its computing formula is as follows:

S=b × L × 2+ π × a × L;

Roadway surrounding rock with distinguished and admirable carry out heat exchange after, absorb its temperature of heat can be raised to the same with airflow temperature, the temperature of final country rock wall is T '; And the primitive rock temperature of mine shallow-layer is lower than T ', its heat can gradually to country rock internal delivery; Therefore,

Q₁=α × S × (T'-T) × t;

$c_p\mathrm{\ρ}Q(T_1-T^{\′})=\mathrm{\α}\×(b\×L\×2+\mathrm{\π}\×a\×L)\×(T^{\′}-T)\×\frac{L}{v};$

In formula, α is dry roadway wall convection transfer rate, adopts α=2.728 ε ν^0.8W/m²DEG C calculate; ε is the coefficient of tunnel roughness, and hydraulically smooth surface takes 1; The big lane of prevailing traffic takes 1-1.65; Haulage way takes 1.65-2.50; Work surface takes 2.50-3.10;

Therefore the physical dimension of mine working meets as follows:

$2b+\mathrm{\π}a=\frac{{\mathrm{vc}}_p\mathrm{\ρ}Q(T_1-T^{\′})}{{\mathrm{\αL}}^2(T^{\′}-T)};$

Simultaneous above formula can obtain the physical dimension of entry:

$a=\frac{{\mathrm{vc}}_p\mathrm{\ρ}Q(T_1-T^{\′})}{{\mathrm{\π\αL}}^2(T^{\′}-T)}-\frac{1}{\mathrm{\π}}\sqrt{{\left(\frac{{\mathrm{vc}}_p\mathrm{\ρ}Q(T_1-T^{\′})}{{\mathrm{\αL}}^2(T^{\′}-T)}\right)}^2-\frac{2\mathrm{\π}Q}{L}};$

$b=\frac{1}{2}\sqrt{{\left(\frac{{\mathrm{vc}}_p\mathrm{\ρ}Q(T_1-T^{\′})}{{\mathrm{\αL}}^2(T^{\′}-T)}\right)}^2-\frac{2\mathrm{\π}Q}{L}}.$

The method have the advantages that

1. the shallow-layer tunnel that the present invention utilizes mine discarded carries out into distinguished and admirable temperature adjusting, establishes the certain air quantity temperature of regulation and control, required heading sizes expression formula; Realize shallow-layer roadway ground, mine temperature effect the quantization entering airflow temperature is regulated and controled, it was predicted that homoiothermic tunnel, to distinguished and admirable regulation and control result, utilizes ground temperature pre-cooling mine to enter the distinguished and admirable purpose reaching mine ventilation energy-saving cool-down summer; Utilize winter ground temperature preheating mine to enter distinguished and admirable, solve downcast ice formation issues.

Accompanying drawing explanation

Fig. 1 is the tunnel schematic diagram of the present invention.

Fig. 2 is that tunnel of the present invention regulates and controls into airflow temperature schematic diagram.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.

Embodiment 1

As shown in Figure 1, 2, the invention discloses a kind of mine shallow-layer in summer tunnel and regulate into distinguished and admirable temperature methods, method includes tunnel section design and Section Design assessment, tunnel section design concrete structure includes two parts, Part I is the length of side is the square bottom of 2a, Part II is radius is the Semicircular arched of a, and Semicircular arched is arranged at square base top, and Section Design assessment includes parameter setting and Section Design proves two parts.

Wherein, Section Design is assessed, and concrete grammar is as follows:

Parameter setting: summer, mine surface temperature was T₁, it is assumed that the temperature in the tunnel that distinguished and admirable entrance takes is also for T₁, distinguished and admirable Qm required for existing getting working face³, and airflow temperature need to reach T ' (T ' > T₁), distinguished and admirable density p, wind speed v, specific heat capacity is Cp;

Section Design is proved: the distinguished and admirable time in the horizontal semicircular tunnel through length L isAnd the wind flow that in during this period of time, getting working face needs is Q; In the timeIn, the wind flow that the horizontal semicircular tunnel of length L flows through isTherefore,

$Q=2abL+\frac{1}{2}{\mathrm{\πa}}^{2}L;$

Distinguished and admirable from T₁Dropping to T', its heat reduced value is Q₁, its reduced value is exactly the distinguished and admirable heat dissipation capacity to country rock:

Q₁=c_pM Δ T=c_pρQ(T₁-T');

Tunnel carries out in heat exchanging process with distinguished and admirable, and its base plate is fewer with the distinguished and admirable heat carried out exchange, therefore only studies two sides and the top board in tunnel, and the area of its heat exchange is S, and its computing formula is as follows:

S=b × L × 2+ π × a × L;

Roadway surrounding rock with distinguished and admirable carry out heat exchange after, absorb its temperature of heat can be raised to the same with airflow temperature, the temperature of final country rock wall is T '; And the primitive rock temperature of mine shallow-layer is lower than T ', its heat can gradually to country rock internal delivery; Therefore,

Q₁=α × S × (T'-T) × t;

$c_p\mathrm{\ρ}Q(T_1-T^{\′})=\mathrm{\α}\×(b\×L\×2+\mathrm{\π}\×a\×L)\×(T^{\′}-T)\×\frac{L}{v};$

In formula, α is dry roadway wall convection transfer rate, adopts α=2.728 ε ν^0.8W/m²DEG C calculate; ε is the coefficient of tunnel roughness, and hydraulically smooth surface takes 1; The big lane of prevailing traffic takes 1-1.65; Haulage way takes 1.65-2.50; Work surface takes 2.50-3.10;

Therefore the physical dimension of mine working meets as follows:

$2b+\mathrm{\π}a=\frac{{\mathrm{vc}}_p\mathrm{\ρ}Q(T_1-T^{\′})}{{\mathrm{\αL}}^2(T^{\′}-T)};$

Simultaneous above formula can obtain the physical dimension of entry:

$a=\frac{{\mathrm{vc}}_p\mathrm{\ρ}Q(T_1-T^{\′})}{{\mathrm{\π\αL}}^2(T^{\′}-T)}-\frac{1}{\mathrm{\π}}\sqrt{{\left(\frac{{\mathrm{vc}}_p\mathrm{\ρ}Q(T_1-T^{\′})}{{\mathrm{\αL}}^2(T^{\′}-T)}\right)}^2-\frac{2\mathrm{\π}Q}{L}};$

$b=\frac{1}{2}\sqrt{{\left(\frac{{\mathrm{vc}}_p\mathrm{\ρ}Q(T_1-T^{\′})}{{\mathrm{\αL}}^2(T^{\′}-T)}\right)}^2-\frac{2\mathrm{\π}Q}{L}}.$

Embodiment 2

As shown in Figure 1, 2, the invention discloses a kind of mine shallow-layer in winter tunnel and regulate into distinguished and admirable temperature methods, concrete tunnel section design and Section Design assessment identical with embodiment 1, wherein parameter setting mine in winter surface temperature is T₁, airflow temperature need to reach T ' (T ' < T₁).

The physical dimension of the entry gone out calculated is:

$a=\frac{{\mathrm{vc}}_p\mathrm{\&rho;}Q(T^{\&prime;}-{T_1}^{\&prime;})}{{\mathrm{\&pi;\&alpha;L}}^2(T-T^{\&prime;})}-\frac{1}{\mathrm{\&pi;}}\sqrt{{\left(\frac{{\mathrm{vc}}_p\mathrm{\&rho;}Q(T^{\&prime;}-T_1)}{{\mathrm{\&alpha;L}}^2(T-T^{\&prime;})}\right)}^2-\frac{2\mathrm{\&pi;}Q}{L}};$

$b=\frac{1}{2}\sqrt{{\left(\frac{{\mathrm{vc}}_p\mathrm{\&rho;}Q(T^{\&prime;}-T_1)}{{\mathrm{\&alpha;L}}^2(T-T^{\&prime;})}\right)}^2-\frac{2\mathrm{\&pi;}Q}{L}}.$

The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention.

Claims (2)

1. shallow-layer tunnel, a mine regulates into distinguished and admirable temperature methods, it is characterized in that, described method includes tunnel section design and Section Design assessment, described tunnel section design concrete structure includes two parts, Part I is the length of side is the square bottom of 2a, Part II is radius is the Semicircular arched of a, and described Semicircular arched is arranged at square base top, and described Section Design assessment includes parameter setting and Section Design proves two parts.

2. a kind of shallow-layer tunnel, mine as claimed in claim 1 regulates into distinguished and admirable temperature methods, it is characterised in that: described Section Design assessment, concrete grammar is as follows:

Parameter setting: summer, mine surface temperature was T₁, it is assumed that the temperature in the tunnel that distinguished and admirable entrance takes is also for T₁, distinguished and admirable Qm required for existing getting working face³, and airflow temperature need to reach T ' (T ' > T₁), distinguished and admirable density p, wind speed v, specific heat capacity is Cp;

Section Design is proved: the distinguished and admirable time in the horizontal semicircular tunnel through length L isAnd the wind flow that in during this period of time, getting working face needs is Q; In the timeIn, the wind flow that the horizontal semicircular tunnel of length L flows through isTherefore,

$Q=2abL+\frac{1}{2}{\mathrm{\&pi;a}}^{2}L;$

Distinguished and admirable from T₁Dropping to T', its heat reduced value is Q₁, its reduced value is exactly the distinguished and admirable heat dissipation capacity to country rock:

Q₁=c_pM Δ T=c_pρQ(T₁-T');

Tunnel carries out in heat exchanging process with distinguished and admirable, and its base plate is fewer with the distinguished and admirable heat carried out exchange, therefore only studies two sides and the top board in tunnel, and the area of its heat exchange is S, and its computing formula is as follows:

S=b × L × 2+ π × a × L;

Roadway surrounding rock with distinguished and admirable carry out heat exchange after, absorb its temperature of heat can be raised to the same with airflow temperature, the temperature of final country rock wall is T '; And the primitive rock temperature of mine shallow-layer is lower than T ', its heat can gradually to country rock internal delivery; Therefore,

Q₁=α × S × (T'-T) × t;

$c_p\mathrm{\&rho;}Q(T_1-T^{\&prime;})=\mathrm{\&alpha;}\&times;(b\&times;L\&times;2+\mathrm{\&pi;}\&times;a\&times;L)\&times;(T^{\&prime;}-T)\&times;\frac{L}{v};$

In formula, α is dry roadway wall convection transfer rate, adopts α=2.728 ε ν^0.8W/m²DEG C calculate; ε is the coefficient of tunnel roughness, and hydraulically smooth surface takes 1; The big lane of prevailing traffic takes 1-1.65; Haulage way takes 1.65-2.50; Work surface takes 2.50-3.10;

Therefore the physical dimension of mine working meets as follows:

$2b+\mathrm{\&pi;}a=\frac{{\mathrm{vc}}_p\mathrm{\&rho;}Q(T_1-T^{\&prime;})}{{\mathrm{\&alpha;L}}^2(T^{\&prime;}-T)};$

Simultaneous above formula can obtain the physical dimension of entry:

$a=\frac{{\mathrm{vc}}_p\mathrm{\&rho;}Q(T_1-T^{\&prime;})}{{\mathrm{\&pi;\&alpha;L}}^2(T^{\&prime;}-T)}-\frac{1}{\mathrm{\&pi;}}\sqrt{{\left(\frac{{\mathrm{vc}}_p\mathrm{\&rho;}Q(T_1-T^{\&prime;})}{{\mathrm{\&alpha;L}}^2(T^{\&prime;}-T)}\right)}^2-\frac{2\mathrm{\&pi;}Q}{L}};$

$b=\frac{1}{2}\sqrt{{\left(\frac{{\mathrm{vc}}_p\mathrm{\&rho;}Q(T_1-T^{\&prime;})}{{\mathrm{\&alpha;L}}^2(T^{\&prime;}-T)}\right)}^2-\frac{2\mathrm{\&pi;}Q}{L}}.$