CN216048805U - Closed field type coal slime heating and drying system suitable for thermal power plant - Google Patents
Closed field type coal slime heating and drying system suitable for thermal power plant Download PDFInfo
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- CN216048805U CN216048805U CN202122717987.7U CN202122717987U CN216048805U CN 216048805 U CN216048805 U CN 216048805U CN 202122717987 U CN202122717987 U CN 202122717987U CN 216048805 U CN216048805 U CN 216048805U
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Abstract
A closed field type coal slime heating and drying system suitable for a thermal power plant is composed of an integral heat exchanger system and a closed field type coal slime heating and drying pipeline system; the integrated heat exchanger system comprises a shell-and-tube heat exchanger, and the shell-and-tube heat exchanger is communicated with a heating pipe of the closed field type coal slime heating and drying pipeline system through a water supplementing constant pressure pump and a circulating pump; an electric control cabinet is also arranged in the integral heat exchanger system and is respectively connected with the shell-and-tube heat exchanger, the circulating pump and the water replenishing constant pressure pump; the ground structure of the closed field type coal slime heating and drying pipeline system is characterized in that a bearing plate, a soaking layer, a prefabricated groove heat-insulating plate and a polyethylene cushion layer are sequentially arranged from top to bottom, wherein a coal pile layer is arranged on the bearing plate; the heating pipe is embedded in the prefabricated groove heat-insulation board. The utility model heats and dries the coal slime in the closed coal yard, and has the advantages of no dependence on outdoor weather conditions, environmental pollution reduction, comprehensive utilization of power plant steam, power consumption reduction and the like.
Description
Technical Field
The utility model relates to a coal slime heating and drying system, in particular to a closed field type coal slime heating and drying system applied to a thermal power plant.
Background
In some power plant projects adopting coal slime mixed combustion, the coal slime needs to be dried before combustion, and the coal slime is generally dried by adopting two modes of a coal slime dryer or an open-air drying type. When the outdoor airing type is adopted, the outdoor airing type has the defects of unstable airing effect, high dependence on weather, easy environmental pollution and the like. When the coal slime dryer is used for drying, although the indoor drying reduces the environmental pollution, because a complete set of coal slime drying equipment is added, the one-time investment of the system is greatly increased, and the defects of high power consumption, difficulty in installation and disassembly and the like are overcome.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: on the basis of reducing cost and power consumption, a closed field type coal slime heating and drying system applicable to a thermal power plant is provided.
The technical scheme of the utility model is as follows:
a closed field type coal slime heating and drying system suitable for a thermal power plant is composed of an integral heat exchanger system and a closed field type coal slime heating and drying pipeline system; the integrated heat exchanger system comprises a shell-and-tube heat exchanger, and the shell-and-tube heat exchanger is communicated with a heating pipe of the closed field type coal slime heating and drying pipeline system through a water supplementing constant pressure pump and a circulating pump; an electric control cabinet is also arranged in the integral heat exchanger system and is respectively connected with the shell-and-tube heat exchanger, the circulating pump and the water replenishing constant pressure pump; the ground structure of the closed field type coal slime heating and drying pipeline system is characterized in that a bearing plate, a soaking layer, a prefabricated groove heat-insulating plate and a polyethylene cushion layer are sequentially arranged from top to bottom, wherein a coal pile layer is arranged on the bearing plate; the heating pipe is embedded in the prefabricated groove heat-insulation board.
An overhead layer is arranged between the bearing plate and the soaking layer.
The bearing plate is made of a steel plate with a high heat transfer coefficient.
And a valve for adjusting the water supply temperature is arranged on the water supply and return pipeline of the integral heat exchanger system.
And a foam plastic heat insulating layer is arranged below the expandable polyethylene cushion layer.
The utility model has the beneficial effects that: the utility model heats and dries the coal slime in the closed coal yard, and has the advantages of no dependence on outdoor weather conditions, environmental pollution reduction, comprehensive utilization of power plant steam, power consumption reduction and the like.
Drawings
Fig. 1 is an overall schematic of the present invention.
Fig. 2 is a ground construction diagram of a closed field type coal slime heating and drying pipeline system.
FIG. 3 is a schematic diagram of the heat exchange of the present invention.
Detailed Description
As shown in fig. 1, a closed field type coal slurry heating and drying system suitable for a thermal power plant is composed of an integral heat exchanger system 1 and a closed field type coal slurry heating and drying pipeline system 100. The integral heat exchanger system 1 comprises a shell-and-tube heat exchanger 2, and the shell-and-tube heat exchanger 2 is communicated with a heating pipe 6 of the closed-site coal slime heating and drying pipeline system through a water supplementing constant pressure pump 4 and a circulating pump 3. A valve 12 for adjusting the temperature of the supplied water is arranged on the water supply and return pipeline of the integrated heat exchanger system 1. An electric control cabinet 5 is further arranged in the integral heat exchanger system 1, and the electric control cabinet 5 is respectively connected with the shell-and-tube heat exchanger 2, the circulating pump 3 and the water supplementing constant pressure pump 4 and used for controlling the normal operation of the integral heat exchanger system 1.
Integral heat exchanger system 1 utilizes shell and tube type heat exchanger 2 to change high temperature steam into the heating hot water of certain temperature through connecting the steam conduit of power plant, overcomes the circulating resistance of loop through circulating pump 3, sends high temperature hot water to closed field formula coal slime heating stoving pipe-line system, provides the heat for the coal slime is dried, dries the coal slime within the specified time to low temperature hot water after will dispelling the heat and cooling is sent back to integral heat exchanger system 1. The water supplementing and constant pressure pump 4 is used for supplementing water and constant pressure of the system, and the electric control cabinet 5 is used for controlling the system. The valve 12 is positioned between the water supply and return heating pipes, and the water supply temperature of the system is adjusted by adjusting the opening degree of the valve.
The ground structure of the closed field type coal slime heating and drying pipeline system 100 is characterized in that a bearing plate 7, a heat equalizing layer 8, a prefabricated groove heat insulation plate 9, a Expandable Polyethylene (EPE) cushion layer 10 and a foamed plastic heat insulation layer 11 are sequentially arranged from top to bottom, wherein a coal pile layer is arranged on the bearing plate 7; because the closed field type coal slime heating and drying pipeline system 100 is provided with heavy equipment such as a coal unloader and the like above the closed field type coal slime heating and drying pipeline system, in order to ensure the safe operation of the drying system, an overhead layer, namely a corresponding air layer, is arranged between the bearing plate 7 and the soaking layer 8, so that the soaking layer 8 and the heating pipe 6 are prevented from directly bearing pressure. In order to ensure the heat transfer effect of the whole system, the bearing plate 7 is made of a steel plate with a high heat transfer coefficient. Prefabricated slot heated board 9 is embedded to have heating pipe 6, lays the temperature uniformity of heat-equalizing layer 8 in order to ensure the face of drying above it, prevents to lead to the poor problem of stoving effect because of local temperature is uneven. An Expandable Polyethylene (EPE) cushion layer 10 is laid below the prefabricated groove heat-insulation plate 9 and used as a moisture-proof layer for moisture insulation. An insulating layer 11 of foamed plastic is laid under the Expandable Polyethylene (EPE) blanket 10 to prevent heat loss to the ground to minimize system heat loss.
A plurality of heat exchange surfaces exist in a theoretical heat transfer model of a ground structure of a closed field type coal slime heating and drying pipeline system, and are respectively the surface of a soaking layer for drying at the bottom layer, a steel plate, the lower surface of a coal pile layer and the upper surface of the coal pile layer. For the sake of simplicity of calculation, the temperature difference between the lower surface and the upper surface of the steel plate is small because the thermal conductivity of the steel plate is high, so the steel plate is regarded as a whole, and the temperature of the above 3 surfaces is considered to be consistent, and the temperature is constant as T2 because the lower surface of the coal pile layer is closely attached to the upper surface of the steel plate. The upper surface temperature of the coal pile layer is T1, the temperature of the soaking layer and the surface thereof is T, and the environment temperature in the coal yard where the coal pile is located and the temperature of the inner surface of the building are Th.
When the system is in steady-state heat transfer, the total heat exchange quantity Q of the upper surface of the coal pile layer and the unit area of the internal environment of the coal yard is the sum of the convection heat exchange quantity of the surface of the unit area of the coal pile layer, the radiation heat exchange quantity of the surface of the unit area of the coal pile layer and the water vapor evaporation and absorption heat quantity of the unit area of the coal pile. The total heat exchange quantity Q is equal to the sum of the heat conduction quantity between the upper surface and the lower surface of the coal pile layer in unit area and the steam evaporation and absorption quantity of the coal pile in unit area. And the total heat exchange quantity Q is also equal to the sum of the radiation heat exchange quantity and the convection heat exchange quantity between the two surfaces of the air interlayer in unit area. Namely:
Q＝qf+qh+qx＝qd+qx＝Qf+Qh
qfsurface convection heat exchange amount of coal pile per unit area, W/m2；
qhW/m, surface radiant heat exchange per unit area of coal pile2；
qxThe sum of the heat absorbed by the steam evaporation of the coal pile per unit area, W/m2；
qdHeat transfer between the upper and lower surfaces of the coal pile of unit area, W/m2；
QfW/m radiant heat exchange between two surfaces of air interlayer in unit area2；
QhW/m convection heat exchange amount between two surfaces of air interlayer in unit area2；
According to the theoretical heat transfer model established by the heat relation, the approximate temperature range of each surface and the total heat exchange quantity Q required by drying the coal pile layer in unit area under the steady state can be determined by assuming partial parameter values and trial calculation. Meanwhile, the sum of the total heat exchange quantity Q of the unit area in unit time and the heat quantity Q' absorbed by the coal pile layer in unit time after being heated from the initial temperature to the steady state is the total heat quantity required by drying the coal pile layer in unit area, and the capacity of a system of the heating station and the capacity of equipment such as a corresponding water pump are determined by combining the drying area.
The area of a closed site for drying A1 is 3000m2The thickness of the laid coal slime is 0.15m during drying, the heat conductivity coefficient lambda of the coal slime is 0.25W/(m.K), the water content of the coal slime needs to be reduced by 8% through drying, the coal is used for ensuring the health and safety of workers in a drying area, the surface temperature of a steel plate is not more than 50 ℃, and the theoretical drying time is 24 hours. The temperature of the water supply and return provided by the integral heat exchanger system is 80 ℃/60 ℃.
The following calculations are based on unit area, and the heat q absorbed by the water vapor evaporation of the coal pile layer per unit time and unit area under steady statex：
qx＝ρCoal (coal)·V·8％·r/τ·3600＝280W/m2 (1)
V＝1·ι (2)
ρCoal (coal)Coal slurry density, 880kg/m in this example3；
r is latent heat of vaporization of water, and 2302kJ/kg is taken;
tau is the time needed for drying, and the value of the example is 24 h;
iota is the thickness of the coal pile layer, and the value is 0.15 m;
v is the volume of coal slime per unit area, 0.15m3；
The unit area coal pile surface convection heat transfer qh:
qh＝h1(T1-Th) (3)
qualitative temperature: 0.5 (T)1+Th)；
Rho is the air density at the qualitative temperature;
pr is the Plantt constant at qualitative temperature;
ν is the speed of air sweeping on the surface of the coal pile layer, and the value of the example is 0.1 m/s;
λair (a)The air heat conductivity coefficient under the qualitative temperature is 0.0248W/(m.K);
μ aerodynamic viscosity at qualitative temperature;
l is the length along the flow direction and takes the value of 1m as the qualitative size;
Ththe indoor environment temperature of a coal yard, the value of the example is 0 ℃;
T1the temperature of the upper surface of the coal pile layer;
radiant heat exchange quantity q of surface of coal pile layer per unit areaf:
ε1The emissivity of the outer surface of the coal pile layer is 0.9 in the example;
ε2the emissivity of the inner surface of the closed drying coal yard takes 0.9 in the example;
A1/A2the ratio of the area of the closed drying site to the area of the inner surface of the wall body of the coal yard is 1.57;
stefan-boltzmann constant, taking 5.67 x 10-8W·m-2·K-4
Heat transfer q between the upper and lower surfaces of a unit area coal piled:
Iota is the thickness of the coal pile layer, and the value is 0.15 m;
lambda is the heat conductivity coefficient of coal, and the value is 0.25W/(m.K);
T2the temperature of the steel plate and the temperature of the lower surface of the coal pile layer;
radiant heat exchange Q between two surfaces of air interlayer in unit areaf：
T, the temperature of the soaking layer and the surface thereof, namely the temperature of the supplied backwater in the example is 80 ℃/60 ℃, and the temperature of the soaking layer and the surface thereof is 70 ℃;
ε3emissivity of the lower surface of the steel plate, the value of the example is 0.9;
ε4the emissivity of the upper surface of the soaking layer is 0.9 in the example;
convective heat transfer Q between two surfaces of air interlayer in unit areah：
Qh＝h2(T-T2) (9)
Qualitative temperature: 0.5(T + T)2)；
Delta is the thickness of the air layer, the value of the example is 0.9;
pr is the Plantt constant at qualitative temperature;
g is the gravity acceleration with the value of 9.8m/s2；
Delta tau is the temperature difference and takes the value of T-T2；
Total heat exchange amount per unit area Q at steady state per unit time:
Q＝qf+qh+qx＝qd+qx＝Qf+Qh (12)
the amount of heat Q' absorbed per unit time per unit area of the coal bed heated from the initial temperature to the steady state is
T0The initial temperature of the coal slime is consistent with the ambient temperature, and the value of the example is 0 ℃;
c specific heat capacity of coal slurry, the value of the example is 1.2kJ/kg DEG C-1；
From equations (1) - (13), the following calculation can be obtained through repeated calculation:
temperature T of upper surface of coal pile layer1At 8 ℃ and the steel plate temperature and the lower surface temperature T of the coal pile2Is 33.7 ℃, and the temperature meets the safe operation requirement that the surface temperature of the steel plate does not exceed 50 ℃. The total heat exchange quantity Q per unit area under the steady state is 323W/m2(ii) a The heat quantity Q' absorbed by the coal pile layer per unit time from the initial temperature to the steady state is 38W/m2(ii) a The total heat quantity required per unit time and unit area is 361W/m2. The heat required by the corresponding coal slime heating and drying system is 361 multiplied by A1 (in the example, A1 takes 3000m2) 1083KW, corresponding integral heat exchanger system capacity value should be no less than 1100kW, corresponding circulating water pump flow value should be no less than 48m3The flow of the water replenishing pump is not less than 48 multiplied by 4 percent and is 1.92m3/h。
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solutions of the present invention, and it should be noted that, further improvements and changes can be made by those skilled in the art based on the technical solutions of the present invention, and these improvements and changes should be covered within the protection scope of the present invention.
Claims (5)
1. A closed field type coal slime heating and drying system suitable for a thermal power plant is composed of an integral heat exchanger system (1) and a closed field type coal slime heating and drying pipeline system (100); the integrated heat exchanger system (1) comprises a shell-and-tube heat exchanger (2), and the shell-and-tube heat exchanger (2) is communicated with a heating pipe (6) of a closed field type coal slime heating and drying pipeline system through a water supplementing constant pressure pump (4) and a circulating pump (3); an electric control cabinet (5) is also arranged in the integral heat exchanger system (1), and the electric control cabinet (5) is respectively connected with the shell-and-tube heat exchanger (2), the circulating pump (3) and the water supplementing constant pressure pump (4); the ground structure of the closed field type coal slime heating and drying pipeline system (100) is characterized in that a bearing plate (7), a heat equalizing layer (8), a prefabricated groove heat insulation plate (9) and a polyethylene cushion layer (10) are sequentially arranged from top to bottom, wherein a coal pile layer is arranged on the bearing plate (7); the heating pipe (6) is embedded in the prefabricated groove heat-insulation board (9).
2. The closed field type coal slime heating and drying system suitable for the thermal power plant as claimed in claim 1, wherein: an overhead layer is arranged between the bearing plate (7) and the uniform heating layer (8).
3. The closed field type coal slime heating and drying system suitable for the thermal power plant as claimed in claim 1 or 2, wherein: the bearing plate (7) is made of a steel plate with a high heat transfer coefficient.
4. The closed field type coal slime heating and drying system suitable for the thermal power plant as claimed in claim 1, wherein: a valve (12) for adjusting the temperature of the supplied water is arranged on a water supply and return pipeline of the integral heat exchanger system (1).
5. The closed field type coal slime heating and drying system suitable for the thermal power plant as claimed in claim 1, wherein: and a foam plastic heat insulation layer (11) is arranged below the expandable polyethylene cushion layer (10).
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| CN202122717987.7U CN216048805U (en) | 2021-11-08 | 2021-11-08 | Closed field type coal slime heating and drying system suitable for thermal power plant |
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