CN220379821U - Heat supply network primary water return water waste heat utilization pipeline - Google Patents

Abstract

The utility model discloses a heat supply network primary water backwater waste heat utilization pipeline which comprises a primary network backwater pipeline, a heat supply network head station, a condenser, a warm air house, a backwater interception pipeline and a backwater return pipeline.

Description

Heat supply network primary water return water waste heat utilization pipeline

Technical Field

The utility model belongs to the technical field of urban central heating, and relates to a heat supply network primary water backwater waste heat utilization pipeline.

Background

In the northern central heating system, a heating pipe network is divided into a primary pipe network and a secondary pipe network, wherein the primary pipe network and the secondary pipe network perform heat exchange through a heat exchange station, namely, the primary pipe network is a pipe network connected between the heat exchange station and a power plant, the secondary pipe network is a pipe network connected between the heat exchange station and a user, the power plant outputs hot water to the heat exchange station, and the heat exchange is performed between the heat exchange station and the secondary pipe network, so that a heating user supplies heat through the secondary pipe network.

At present, heat efficiency loss exists in heat exchange of a primary pipe network and a secondary pipe network, and if the heat efficiency can be improved, the effects of energy conservation and emission reduction can be achieved, so that the raw material consumption of a production enterprise can be reduced, the production cost can be reduced, and the purposes of energy conservation and emission reduction can be realized.

The thermal power plant is a main heat source point for heating in winter in urban areas, and the primary pipe network backwater flow is as follows: firstly, after the primary condenser of the #3 heat supply network enters the primary condenser of the #1 and #2 heat supply networks for secondary heating according to the running condition, qualified primary hot water is supplied according to the requirement of a heat regulation center, and after heat exchange is carried out by a heat exchange station in a city, the primary water returns to a power plant. The primary net backwater temperature is between 40 ℃ and 60 ℃ under the influence of the environment and the heat exchange effect, and the heat still has the utilization value.

When the boiler runs in winter, in order to reduce low-temperature corrosion of the heating surface, a heater is arranged at the outlet or inlet of the primary air and the blower of the boiler so as to meet the air temperature at the inlet of the air preheater. The air heater heats air by utilizing the heat of steam, the steam of the air heater is taken from a low-pressure auxiliary steam header (the parameters are P:0.4-0.6MPa, the temperature is 160-180 ℃), outdoor cold air is heated to more than 27 ℃ (the primary air temperature is 27 ℃ and the secondary air temperature is 23 ℃), the air is sent to an air preheater, and after the steam exchanges heat, the steam is drained to a constant-exhaust expansion vessel or a steam exhaust device; that is, it is common to use a heater for exchanging heat with the unit steam to heat the outdoor air entering the boiler.

Based on the analysis, the application designs a heat supply network primary water backwater waste heat utilization pipeline based on the concept of utilizing the waste heat of primary network backwater to lift the temperature of air entering a boiler.

Disclosure of Invention

The utility model provides a primary water backwater waste heat utilization pipeline which is simple in structure and low in layout cost, and utilizes the primary network backwater waste heat to replace the steam taken from the existing low-pressure auxiliary steam header of a unit, so that on one hand, the effective utilization of backwater low-quality waste heat is realized, and on the other hand, the utilization of high-quality steam (heat source) of the unit is avoided, so that the primary water backwater waste heat utilization pipeline can be effectively applied to other equipment, and the requirements of effective utilization of waste heat, energy conservation, consumption reduction and maximization of economic benefit are realized.

In order to achieve the above purpose, the utility model provides a heat supply network primary water return waste heat utilization pipeline, which comprises a primary network return water pipeline, a heat supply network head station, a condenser, a warm air house, a return water interception pipeline and a return water return pipeline, wherein the heat supply network head station is arranged at the downstream of the primary network return water pipeline so as to heat return water of the primary network return water pipeline; the condenser is arranged between the primary network water return pipeline and the heat supply network head station, so that waste heat utilization is carried out on return water of the primary network water return pipeline and the return water is returned to the heat supply network head station; the warm air room is arranged at the inlet end of the furnace fan, and a heat exchange tube consisting of a tube bundle and fins is arranged in the warm air room; the backwater interception pipeline is arranged between the backwater end of the heat supply network head station and the water inlet end of the heat exchange pipe in the warm air room and is used for intercepting backwater entering the heat supply network head station and conveying the intercepted backwater into the heat exchange pipe of the warm air room so as to heat air in the warm air room; the backwater return pipeline is arranged between the water outlet end of the heat exchange pipe in the warm air house and the water inlet end of the condenser and is used for conveying backwater after heat exchange to the heat supply network head station through the condenser.

As the preferred scheme of this application, the heat supply network head station contains #1 heat supply network head station and #2 heat supply network head station, return water interception pipeline with the return water end intercommunication of #2 heat supply network head station utilizes the heat supply network head station can carry out the secondary heating in order to supply qualified primary hot water to the return water.

As the preferred scheme of this application, according to the operation quantity of boiler, the warm braw room can set up the multiunit, and the heat transfer pipe in this multiunit warm braw room is parallelly connected each other.

As the preferable scheme of this application, the heat exchange tube contains multiunit, and this multiunit heat exchange tube is vertical to be laid and constitutes heat transfer unit.

As the preferred scheme of this application, warm braw room is erect through the support frame, and this warm braw room's at least one side is equipped with the air intake, the shutter is installed to air intake department.

As a preferable scheme of the application, the main body of the warm air house is composed of a heat insulation plate.

Compared with the prior art, this heating network primary water return water waste heat utilization pipeline has add warm braw house, return water shutoff pipeline and return water return line on the basis of current primary pipe network return water management pipeline, utilize return water shutoff pipeline can carry out partial shutoff to the return water that gets into the first station of heating network, and utilize this partial return water that intercepts to heat the air in the warm braw house through the heat exchange tube, the air temperature after the heating will satisfy the boiler needs, so can improve the operating efficiency of boiler, return water after accomplishing the heat transfer carries the condenser through return water return line, get into the condenser along with return water from primary network return water pipeline 1 and exchange heat, be carried to the first station of heating network after accomplishing the heat transfer and heat, it is clear that this pipeline simple structure of this application, the layout cost is lower, utilize primary network return water waste heat to replace the steam (electric fan heater) of current taking from the unit low pressure auxiliary steam header, so on the one hand has realized the effective utilization of return water low-quality waste heat, on the other hand avoided the utilization to unit high-quality steam (heat source), make it can be by root high-efficient being applied to other equipment, the realization waste heat is effectively, energy-saving and economic benefit is most.

Drawings

Fig. 1 is a schematic structural diagram of a heat supply network primary water return waste heat utilization pipeline according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of an installation structure of a warm air house according to an embodiment of the present utility model.

Fig. 3 is a schematic layout structure of a heat exchange tube in a warm air house according to an embodiment of the present utility model.

Reference numerals

The heat supply system comprises a primary network water return pipeline 1, a heat supply network head station 2, a condenser 3, a warm air house 4, a water return interception pipeline 5, a water return pipeline 6, a heat exchange unit 7, a support frame 8, a shutter 9, a primary network water supply pipeline 10 and a valve 11.

Detailed Description

The foregoing is further elaborated by the following examples, it being evident that the examples described are only some, but not all, of the examples of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The embodiment provides a heat supply network primary water return waste heat utilization pipeline, as shown in fig. 1, the pipeline comprises a primary network return water pipeline 1, a heat supply network head station 2, a condenser 3, a warm air house 4, a return water interception pipeline 5 and a return water return pipeline 6, wherein the primary network return water pipeline 1, the heat supply network head station 2 and the condenser 3 are existing traditional primary network return water treatment pipelines, in the return water treatment pipelines, the heat supply network head station 2 is arranged at the downstream of the primary network return water pipeline 1 so as to heat return water of the primary network return water pipeline 1 until the supply and discharge requirements are met, and then the return water is supplied to a heat exchange station through a primary network water supply pipeline 10, and the condenser 3 is arranged between the primary network return water pipeline 1 and the heat supply network head station 2 so as to perform waste heat utilization (recovery) on part of return water of the primary network return water pipeline 1 and return water to the heat supply network head station 2 so as to heat and supply and discharge; the warm air house 4, the backwater intercepting pipeline 5 and the backwater return pipeline 6 are additionally arranged on the basis of the existing traditional primary pipe network backwater treatment pipeline, in the embodiment, the warm air house 4 is arranged at the inlet end of a boiler fan, a heat exchange pipe formed by a pipe bundle and fins is arranged in the warm air house 4, the heat exchange pipe can heat air in the warm air house 4 in a heat exchange mode after being introduced into a heat source, and then the outdoor air entering a boiler is heated, so that the temperature of air required by boiler powder making and combustion is improved, the heated air is used as boiler fresh air, the operation efficiency of the boiler can be effectively improved, it can be understood that the number of the warm air houses 4 can be determined according to the number of operating boilers, when a plurality of boilers are operated simultaneously, the warm air houses 4 can be arranged at the inlet end of the corresponding boiler fan of each boiler, and in order to improve the heating efficiency of the air in the warm air houses 4 and facilitate the independent control of whether the warm air houses 4 are heated or not, preferably, when the heat exchange pipes in the warm air houses 4 are arranged in a plurality of groups, the heat exchange pipes in the heat houses 4 are connected in parallel with each other, and then the heat pipe condenser 2 and the condenser 3 are connected in parallel; the backwater intercepting pipeline 5 is arranged between the backwater end of the heat supply network head station 2 and the water inlet end of the heat exchange pipe in the warm air house 4, and is used for intercepting part of backwater entering the heat supply network head station 2 and conveying the intercepted part of backwater into the heat exchange pipe of the warm air house 4 so as to heat air in the warm air house 4; the backwater return pipeline 6 is arranged between the water outlet end of the heat exchange pipe in the warm air house 4 and the water inlet end of the condenser 3, and is used for returning backwater subjected to heat exchange in the warm air house 4 to the heat supply network head station 2 through the condenser 3, in the embodiment, backwater returned to the condenser 3 enters the condenser 3 along with backwater entering the condenser 3 for waste heat recovery and utilization, and after recovery and utilization, the backwater is returned to the heat supply network head station 2 by the condenser 3 for heating so as to enter a heat supply flow through the primary network water supply pipeline 10; it can be understood that the valves 11 for controlling the on-off of the backwater intercepting pipeline 5, the backwater return pipeline 6 and other corresponding connecting pipelines are arranged in the backwater intercepting pipeline 5, the backwater return pipeline 6 and the corresponding connecting pipelines, the types of the valves 11 can be selected according to actual needs, and the embodiment is not limited in detail again.

The application principle of the embodiment comprises: because the outside temperature is lower in winter, the waste heat of the return water of the primary pipe network is utilized to enter the heat exchange pipe of the warm air house 4, the air in the warm air house 4 is heated by utilizing the heat exchange principle, and the return water after completing heat exchange flows back to the heat network head station 2 again through the condenser 3.

As is clear from the above, according to the primary water return waste heat utilization pipeline of the heating network, on the basis of the existing primary pipe network return water system, the warm air house 4, the return water intercepting pipeline 5 and the return water return pipeline 6 are additionally arranged, the return water entering the heating network head station 2 can be partially intercepted by the return water intercepting pipeline 5, the air in the warm air house 4 is heated by the intercepted partial return water through the heat exchange pipe, the heated air temperature can meet the requirements of a boiler, so that the operation efficiency of the boiler can be improved, the return water after heat exchange is conveyed to the condenser 3 through the return water return pipeline 6, enters the condenser 3 along with the return water in the primary pipe network return water pipeline 1 for heat exchange, and is conveyed to the heating network head station 2 for heating after the heat exchange is completed; therefore, the pipeline has a simple structure and lower layout cost, and utilizes the primary network backwater waste heat to replace the steam taken from the low-pressure auxiliary steam header of the unit, so that on one hand, the effective utilization of backwater low-quality waste heat is realized, and on the other hand, the utilization of high-quality steam (heat source) of the unit is avoided, so that the pipeline can be effectively applied to other equipment, and the requirements of effective utilization of waste heat, energy conservation, consumption reduction and maximization of economic benefit are realized

In the embodiment, the temperature is calculated according to the average outdoor temperature of minus 3 ℃ in winter, when the unit runs at full load, if the heat supply network is utilized to replace the air heater by primary backwater, the usage of the air heater is reduced or exited, the consumption of auxiliary steam can be reduced by 22.96 ten thousand tons, the heat is saved by 62.74 Mo Jijiao, and the standard coal amount is saved by 2.32 ten thousand tons. According to the 2021 production condition, the unit power supply coal consumption can be reduced by about 2.78g/kwh.

The auxiliary steam saved by the boiler fan heater is reduced or exited, the power generation amount can be increased by 3784 kilowatts in the whole heating season when the steam amount is fully generated according to the enthalpy value and enthalpy drop calculation, and the waste heat utilization amount is increased by 53 Mo Jijiao.

Therefore, the embodiment adopts the primary backwater waste heat of the heat supply network to replace the heater to heat the outdoor air entering the boiler, and introduces the steam used by the heater into the steam turbine to generate power, so that the purposes of saving energy and reducing consumption are realized on one hand, the high-efficiency utilization of a high-quality heat source is realized on the other hand, the economic benefit is improved, and the carbon emission is reduced.

Preferably, in the present embodiment, the heat supply network head station 2 includes a #1 heat supply network head station 2 and a #2 heat supply network head station 2, the return water interception pipeline 5 is communicated with a return water end of the #2 heat supply network head station 2, and the #1 heat supply network head station 2 and the #2 heat supply network head station 2 can be utilized to perform secondary heating on return water so as to supply qualified primary hot water; of course, in other embodiments of the present application, the water return intercepting pipeline 5 may also be respectively communicated with the water return ends of the #1 heat supply network head station 2 and the #2 heat supply network head station 2, and whether the water return ends need to be selectively communicated with the #1 heat supply network head station 2 or not needs to be determined according to the water return amount required to intercept.

Preferably, in the embodiment, the warm air house 4 is erected by a supporting frame 8, at least one side of the warm air house 4 is provided with an air inlet, and a shutter 9 is arranged at the air inlet, as shown in fig. 2; it can be understood that the normal passage of the current construction channel of the warm air house 4 can be prevented from being influenced by the warm air house 4 by utilizing the bracket erection mode, and the negative pressure can be prevented from being formed in the warm air house 4 by installing the louver 9, so that the normal operation of the furnace fan is further influenced.

Preferably, in this embodiment, the heat exchange tubes include multiple groups, and the multiple groups of heat exchange tubes are vertically arranged to form the heat exchange unit 7, as shown in fig. 3, and the vertical arrangement of the heat exchange tubes can increase the arrangement amount of the heat exchange tubes, thereby increasing the heat exchange efficiency.

Preferably, in this embodiment, the main body of the warm air house 4 may be made of a conventional common plate material or an insulation board, and in this embodiment, the main body of the warm air house 4 is preferably made of an insulation board, so that the influence of the external low-temperature environment on the heat energy in the warm air house 4 can be avoided, and the heating efficiency of the air in the warm air house 4 is improved.

The foregoing is merely exemplary embodiments of the present utility model, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications can be made by those skilled in the art without departing from the scope of the utility model, which is also to be considered as the scope of the utility model, and which does not affect the effect of the utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (6)

1. The utility model provides a heat supply network return water waste heat utilization pipeline, contains a network return water pipeline (1), heat supply network head station (2) and condenser (3), heat supply network head station (2) set up in the low reaches of a network return water pipeline (1) to heat the return water of a network return water pipeline (1), condenser (3) set up in a network return water pipeline (1) and between heat supply network head station (2) to carry out waste heat utilization and return to heat supply network head station (2) to the return water of a network return water pipeline (1); the hot air heating system is characterized by comprising a hot air room (4), a backwater intercepting pipeline (5) and a backwater return pipeline (6), wherein the hot air room (4) is arranged at the inlet end of a furnace fan, a heat exchange pipe consisting of a pipe bundle and fins is arranged in the hot air room (4), the backwater intercepting pipeline (5) is arranged between the backwater end of a heat supply network head station (2) and the water inlet end of a heat exchange pipe in the hot air room (4) and is used for intercepting backwater entering the heat supply network head station (2) and conveying the intercepted backwater into the heat exchange pipe of the hot air room (4) so as to heat air in the hot air room (4), and the backwater return pipeline (6) is arranged between the water outlet end of the heat exchange pipe in the hot air room (4) and the water inlet end of a condenser (3) and is used for conveying backwater after heat exchange to the heat supply network head station (2) through the condenser (3).

2. The primary water return waste heat utilization pipeline of a heat supply network according to claim 1, wherein the heat supply network head station (2) comprises a #1 heat supply network head station (2) and a #2 heat supply network head station (2), and the return water interception pipeline (5) is communicated with a return water end of the #2 heat supply network head station (2).

3. The heat supply network primary water backwater waste heat utilization pipeline according to claim 1, wherein a plurality of groups of the warm air houses (4) can be arranged according to the running number of boilers, and heat exchange tubes in the plurality of groups of the warm air houses (4) are mutually connected in parallel.

4. A primary water return waste heat utilization pipeline for a heat supply network according to claim 1, wherein the heat exchange tubes comprise a plurality of groups, and the heat exchange tubes are vertically arranged and form a heat exchange unit (7).

5. The heat supply network primary water backwater waste heat utilization pipeline according to claim 1, wherein the warm air house (4) is erected through a supporting frame (8), at least one side of the warm air house (4) is provided with an air inlet, and a shutter (9) is arranged at the air inlet.

6. The heat supply network primary water backwater waste heat utilization pipeline of claim 1, wherein: the main body of the warm air house (4) is composed of a heat insulation plate.