CN216281671U - Heat supply network circulating water system of cogeneration unit - Google Patents
Heat supply network circulating water system of cogeneration unit Download PDFInfo
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Abstract
一种热电联产机组的热网循环水系统，包括给水泵汽轮机以及同轴布置的锅炉给水泵与热网循环水泵，锅炉给水泵连接在锅炉上水管路中，热网循环水泵连接在热网循环水给水管路中；所述的锅炉给水泵与热网循环水泵共同由给水泵汽轮机进行驱动，同时实现锅炉上水和热网循环水给水。调节方法包括当热网循环水泵的出口流量小于热网循环水总流量时，启动备用热网循环水泵、开启备用热网循环水泵出口阀门，通过调节液力耦合器的勺管开度，使热网循环水泵出口流量和备用热网循环水泵的出口流量相加满足热网循环水总流量的要求。本实用新型减少了设备投资成本，降低了热网首站基建投入。
A heat network circulating water system of a cogeneration unit, comprising a feed pump steam turbine, a coaxially arranged boiler feed water pump and a heat network circulating water pump, the boiler feed water pump is connected to a boiler upper water pipeline, and the heat network circulating water pump is connected to the heat network. In the circulating water supply pipeline; the boiler water supply pump and the heat network circulating water pump are jointly driven by the water supply pump steam turbine, and simultaneously realize the boiler water supply and the heat network circulating water supply water. The adjustment method includes: when the outlet flow of the heat network circulating water pump is less than the total flow of the heat network circulating water, starting the standby heat network circulating water pump, opening the outlet valve of the standby heat network circulating water pump, and adjusting the opening of the spoon tube of the hydraulic coupler to make the heat supply. The sum of the outlet flow of the circulating water pump of the heating network and the outlet flow of the circulating water pump of the standby heating network can meet the requirement of the total flow of circulating water of the heating network. The utility model reduces the equipment investment cost and reduces the capital construction investment of the first station of the heat network.
Description
技术领域technical field
本实用新型属于火电厂供热节能领域，涉及一种热电联产机组的热网循环水系统。The utility model belongs to the field of heat supply and energy saving in thermal power plants, and relates to a heat network circulating water system of a heat and power cogeneration unit.
背景技术Background technique
热电联产电厂热网循环水泵的驱动方式有电动机驱动以及汽轮机驱动，其中，电动热网循环水泵系统的结构简单、检修维护方便，但厂用电率及供电煤耗偏高。汽动热网循环水泵的驱动汽源多引自主机抽汽管道，主机加热器抽汽的一部分蒸汽进入热网循环水泵汽轮机内，带动热网循环水泵转动，排汽进入热网加热器汽侧系统。与电动机驱动相较，汽动热网循环水泵可降低厂用电率和供电煤耗，但目前均在热网首站单独设置小汽轮机，未与主机给水泵汽轮机进行耦合，热网循环水泵单独设计汽轮机不仅需配套抽汽管道、排汽管道、润滑油系统，还需要定期维护油系统，场地基建成本、设备投资成本及检修维护成本较高。The driving methods of the heat network circulating water pump in the cogeneration power plant include motor drive and steam turbine drive. Among them, the electric heat network circulating water pump system has a simple structure and is easy to repair and maintain, but the power consumption rate and coal consumption of power supply are relatively high. The driving steam source of the steam-driven heat network circulating water pump is mostly drawn from the main engine extraction pipeline. Part of the steam extracted by the main engine heater enters the heat network circulating water pump turbine, which drives the heat network circulating water pump to rotate, and the exhaust steam enters the heat network heater steam side. system. Compared with the motor drive, the steam-driven heat network circulating water pump can reduce the power consumption rate and coal consumption of power supply, but at present, the small steam turbine is set up separately in the first station of the heat network, not coupled with the main engine feed pump steam turbine, and the heat network circulating water pump is designed separately The steam turbine not only needs to be equipped with steam extraction pipes, exhaust pipes, and lubricating oil systems, but also needs to maintain the oil system regularly. The cost of site infrastructure, equipment investment, and maintenance costs are high.
实用新型内容Utility model content
本实用新型的目的在于针对上述现有技术中热电联产机组供热厂用电率、场地基建成本、设备投资成本及检修维护成本较高的问题，提供一种热电联产机组的热网循环水系统，有效降低供热厂用电率及供热首站投资成本，同时减少了检修期间设备维护量。The purpose of this utility model is to provide a kind of heat network cycle of cogeneration unit in view of the problems of high electricity consumption rate, site infrastructure cost, equipment investment cost and maintenance cost of cogeneration unit in the above-mentioned prior art. The water system can effectively reduce the electricity consumption rate of the heating plant and the investment cost of the first heating station, and at the same time reduce the amount of equipment maintenance during the maintenance period.
为了实现上述目的，本实用新型有如下的技术方案：In order to achieve the above object, the present invention has the following technical solutions:
一种热电联产机组的热网循环水系统，包括给水泵汽轮机以及同轴布置的锅炉给水泵与热网循环水泵，锅炉给水泵连接在锅炉上水管路中，热网循环水泵连接在热网循环水给水管路中；所述的锅炉给水泵与热网循环水泵共同由给水泵汽轮机进行驱动，同时实现锅炉上水和热网循环水给水。A heat network circulating water system of a combined heat and power unit, comprising a feed pump steam turbine, a coaxially arranged boiler feed pump and a heat network circulating water pump, the boiler feed pump is connected to a boiler upper water pipeline, and the heat network circulating water pump is connected to the heat network. In the circulating water water supply pipeline; the boiler water supply pump and the heat network circulating water pump are jointly driven by the water supply pump steam turbine, and simultaneously realize the boiler water supply and the heat network circulating water supply water.
作为本实用新型热电联产机组的热网循环水系统的一种优选方案，锅炉给水泵连接除氧器，通过四抽抽汽管道将汽轮机中压缸的一部分四抽蒸汽送入除氧器，另一部分四抽蒸汽送入水泵汽轮机，水泵汽轮机的排汽进入凝汽器。As a preferred solution of the heating network circulating water system of the cogeneration unit of the present utility model, the boiler feed water pump is connected to the deaerator, and part of the four-pumped steam from the middle pressure cylinder of the steam turbine is sent to the deaerator through the four-pumping and extraction pipeline. Part of the four-pumped steam is sent to the water pump turbine, and the exhaust steam of the water pump turbine enters the condenser.
作为本实用新型热电联产机组的热网循环水系统的一种优选方案，所述的水泵汽轮机设置有进汽调门，控制进汽调门开度能够调节水泵汽轮机的转速。As a preferred solution of the heat network circulating water system of the cogeneration unit of the present invention, the water pump turbine is provided with a steam inlet valve, and the speed of the water pump turbine can be adjusted by controlling the opening of the inlet steam valve.
作为本实用新型热电联产机组的热网循环水系统的一种优选方案，所述的热网循环水泵与给水泵汽轮机之间通过自动同步离合器连接。As a preferred solution of the heat network circulating water system of the cogeneration unit of the present invention, the heat network circulating water pump and the feed water pump steam turbine are connected through an automatic synchronizing clutch.
作为本实用新型热电联产机组的热网循环水系统的一种优选方案，所述的热网循环水给水管路中设置有备用热网循环水泵，备用热网循环水泵与热网循环水泵并联，备用热网循环水泵通过液力耦合器与备用热网循环水泵电动机连接。As a preferred solution of the heat network circulating water system of the cogeneration unit of the present invention, the heat network circulating water supply pipeline is provided with a standby heat network circulating water pump, and the standby heat network circulating water pump and the heat network circulating water pump are connected in parallel , The spare heat network circulating water pump is connected with the spare heat network circulating pump motor through the hydraulic coupler.
作为本实用新型热电联产机组的热网循环水系统的一种优选方案，所述的热网循环水给水管路中按照流向依次设置有热网循环水回水总阀门、热网循环水泵入口阀门、热网循环水泵、热网循环水泵出口阀门以及热网循环水给水总阀门。As a preferred solution of the heating network circulating water system of the cogeneration unit of the present invention, the heating network circulating water supply pipeline is provided with a heating network circulating water return water main valve and a heating network circulating water pump inlet in sequence according to the flow direction. Valve, heat network circulating water pump, heat network circulating water pump outlet valve and heat network circulating water supply water main valve.
作为本实用新型热电联产机组的热网循环水系统的一种优选方案，所述备用热网循环水泵的两端分别与备用热网循环水泵入口阀门和备用热网循环水泵出口阀门的一端连接，备用热网循环水泵入口阀门的另一端连接在热网循环水回水总阀门与热网循环水泵入口阀门之间，备用热网循环水泵出口阀门的另一端连接在热网循环水泵出口阀门与热网循环水给水总阀门之间。As a preferred solution of the heat network circulating water system of the cogeneration unit of the present invention, the two ends of the standby heat network circulating water pump are respectively connected with one end of the standby heat network circulating water pump inlet valve and the standby heat network circulating water pump outlet valve. , the other end of the inlet valve of the standby heat network circulating water pump is connected between the main valve of the heat network circulating water return water and the inlet valve of the heat network circulating water pump, and the other end of the outlet valve of the standby heat network circulating water pump is connected between the heat network circulating water pump outlet valve and the heat network circulating water pump inlet valve. Between the main valves of circulating water supply water in the heat network.
作为本实用新型热电联产机组的热网循环水系统的一种优选方案，所述的热网循环水回水总阀门、热网循环水泵入口阀门、备用热网循环水泵入口阀门、热网循环水泵出口阀门、备用热网循环水泵出口阀门以及热网循环水给水总阀门均采用电动阀门。As a preferred solution of the heat network circulating water system of the cogeneration unit of the present utility model, the heat network circulating water return water master valve, the heat network circulating water pump inlet valve, the standby heat network circulating water pump inlet valve, the heat network circulating water main valve, the heat network circulating water pump inlet valve, The outlet valve of the water pump, the outlet valve of the circulating water pump of the standby heating network and the main valve of the circulating water supply of the heating network are all electric valves.
作为本实用新型热电联产机组的热网循环水系统的一种优选方案，所述的热网循环水泵入口阀门、备用热网循环水泵入口阀门为电动截止阀，系统运行期间均长期开启；热网循环水泵出口阀门、备用热网循环水泵出口阀门为电动调节阀门，系统运行期间根据热网循环水泵与备用热网循环水泵的出力变化调节开度。As a preferred solution of the heating network circulating water system of the cogeneration unit of the present invention, the inlet valve of the heating network circulating water pump and the inlet valve of the standby heating network circulating water pump are electric cut-off valves, which are open for a long time during the operation of the system; The outlet valve of the network circulating water pump and the outlet valve of the standby heat network circulating pump are electric adjustment valves. During the system operation, the opening degree is adjusted according to the output change of the heat network circulating pump and the standby heat network circulating pump.
本实用新型热电联产机组的热网循环水系统的调节方法，包括：The adjusting method of the heating network circulating water system of the cogeneration unit of the utility model comprises:
-当热网循环水泵的出口流量小于热网循环水总流量时，启动备用热网循环水泵、开启备用热网循环水泵出口阀门，通过调节液力耦合器的勺管开度，使热网循环水泵出口流量和备用热网循环水泵的出口流量相加满足热网循环水总流量的要求；- When the outlet flow of the heat network circulating water pump is less than the total flow of the heat network circulating water, start the standby heat network circulating water pump, open the outlet valve of the standby heat network circulating pump, and adjust the opening of the spoon tube of the hydraulic coupler to circulate the heat network. The sum of the outlet flow of the pump and the outlet flow of the circulating water pump of the standby heating network meets the requirement of the total flow of circulating water in the heating network;
-当热网循环水泵的出口流量大于热网循环水总流量时，停运备用热网循环水泵、关闭备用热网循环水泵出口阀门，并通过调节热网循环水泵出口阀门的开度，以满足热网循环水总流量的要求。- When the outlet flow of the heating network circulating water pump is greater than the total flow of the heating network circulating water, stop the standby heating network circulating water pump, close the outlet valve of the standby heating network circulating water pump, and adjust the opening of the outlet valve of the heating network circulating water pump to meet the Requirements for the total flow of circulating water in the heating network.
相较于现有技术，本实用新型有如下的有益效果：Compared with the prior art, the utility model has the following beneficial effects:
通过将热网循环水泵与锅炉给水泵同轴布置，共同由给水泵汽轮机进行驱动，减少了设备投资成本，降低了热网首站基建投入。本实用新型无需另设热网循环水泵汽轮机，减少了检修期间设备维护量。本实用新型的系统简单可靠、结构紧凑、运行维护费用低。By arranging the heating network circulating water pump and the boiler feed water pump coaxially, they are jointly driven by the feed water pump steam turbine, which reduces the equipment investment cost and reduces the infrastructure investment of the first station of the heating network. The utility model does not need to set up additional heat network circulating water pump steam turbine, which reduces the amount of equipment maintenance during the maintenance period. The system of the utility model is simple, reliable, compact in structure and low in operation and maintenance costs.
进一步的，热网循环水给水管路中设置有备用热网循环水泵，备用热网循环水泵与热网循环水泵并联，可在降低设备成本的同时，维持热网循环水流量和压力的稳定。Further, a spare heat network circulating water pump is arranged in the water supply pipeline of the heat network circulating water, and the standby heat network circulating water pump is connected in parallel with the heat network circulating water pump, which can reduce the equipment cost and maintain the stability of the flow and pressure of the heat network circulating water.
附图说明Description of drawings
图1本实用新型热电联产机组的热网循环水系统结构示意图；1 is a schematic diagram of the structure of the heating network circulating water system of the cogeneration unit of the present utility model;
附图中：1-汽轮机中压缸；2-四抽抽汽管道；3-水泵汽轮机；4-锅炉给水泵；5-热网循环水泵；6-备用热网循环水泵；7-液力耦合器；8-备用热网循环水泵电动机；9-热网循环水回水总阀门；10-热网循环水泵入口阀门；11-备用热网循环水泵入口阀门；12-热网循环水泵出口阀门；13-备用热网循环水泵出口阀门；14-热网循环水给水总阀门；15-汽轮机低压缸；16-自动同步离合器；17-除氧器。In the attached drawings: 1- steam turbine medium pressure cylinder; 2- four extraction steam pipes; 3- water pump steam turbine; 4- boiler feed water pump; 5- heating network circulating water pump; 6- standby heating network circulating water pump; 7- hydraulic coupler ;8-standby heat network circulating water pump motor;9-heat network circulating water return water main valve;10-heat network circulating water pump inlet valve;11-standby heat network circulating water pump inlet valve;12-heat network circulating water pump outlet valve;13 - Standby heat network circulating water pump outlet valve; 14 - heat network circulating water supply water main valve; 15 - steam turbine low pressure cylinder; 16 - automatic synchronization clutch; 17 - deaerator.
具体实施方式Detailed ways
下面结合附图及实施例对本实用新型做进一步的详细说明。The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.
参见图1，本实用新型热电联产机组的热网循环水系统，包括给水泵汽轮机3以及同轴布置的锅炉给水泵4与热网循环水泵5，锅炉给水泵4连接在锅炉上水管路中，热网循环水泵5连接在热网循环水给水管路中；热网循环水给水管路中设置有备用热网循环水泵6，备用热网循环水泵6与热网循环水泵5并联，备用热网循环水泵6通过液力耦合器7与备用热网循环水泵电动机8连接。热网循环水给水管路中按照流向依次设置有热网循环水回水总阀门9、热网循环水泵入口阀门10、热网循环水泵5、热网循环水泵出口阀门12以及热网循环水给水总阀门14。备用热网循环水泵6的两端分别与备用热网循环水泵入口阀门11和备用热网循环水泵出口阀门13的一端连接，备用热网循环水泵入口阀门11的另一端连接在热网循环水回水总阀门9与热网循环水泵入口阀门10之间，备用热网循环水泵出口阀门13的另一端连接在热网循环水泵出口阀门12与热网循环水给水总阀门14之间。锅炉给水泵4与热网循环水泵5共同由给水泵汽轮机3进行驱动，同时实现锅炉上水和热网循环水给水。当机组负荷变化时，给水泵汽轮机3将改变转速以保证锅炉给水要求，而热网循环水泵5的出口流量将随之变化，因此设置了与热网循环水泵5并联的备用热网循环水泵6。Referring to Fig. 1, the heat network circulating water system of the cogeneration unit of the present utility model includes a feed water pump steam turbine 3, a coaxially arranged boiler feed water pump 4 and a heat network circulating
热网循环水泵5与给水泵汽轮机3之间通过自动同步离合器16连接。The heat network circulating
水泵汽轮机3设置有进汽调门，控制进汽调门开度能够调节水泵汽轮机3的转速。锅炉给水泵4连接除氧器17，通过四抽抽汽管道2将汽轮机中压缸1的一部分四抽蒸汽送入除氧器17，另一部分四抽蒸汽送入水泵汽轮机3，水泵汽轮机3的排汽进入凝汽器。The water pump turbine 3 is provided with a steam inlet valve, and the speed of the water pump turbine 3 can be adjusted by controlling the opening degree of the inlet valve. The boiler feed water pump 4 is connected to the
水泵汽轮机3的进汽压力由汽轮机四抽蒸汽参数决定，水泵汽轮机3转速以满足锅炉给水压力和流量为目标进行控制，控制方式是调节水泵汽轮机3的进汽调门开度。The inlet steam pressure of the water pump turbine 3 is determined by the parameters of the four extraction steam of the steam turbine. The speed of the water pump turbine 3 is controlled to meet the boiler feed water pressure and flow rate. The control method is to adjust the opening of the inlet steam valve of the water pump turbine 3.
随着机组负荷变化，热网循环水泵5的出口循环水流量将随之发生变化。本实用新型的系统为了保证热网循环水给水流量及压力的稳定性，备用热网循环水泵6设有液力耦合器7跟随水泵汽轮机3的转速进行变化，继而实时改变液力耦合器7的出力。As the unit load changes, the flow rate of the circulating water at the outlet of the heat network circulating
本实用新型通过多个控制阀门控制系统中管道的开闭。其中，热网循环水回水总阀门9、热网循环水泵入口阀门10、备用热网循环水泵入口阀门11、热网循环水泵出口阀门12、备用热网循环水泵出口阀门13以及热网循环水给水总阀门14均采用电动阀门。进一步的，热网循环水泵入口阀门10、备用热网循环水泵入口阀门11为电动截止阀，系统运行期间均长期开启；热网循环水泵出口阀门12、备用热网循环水泵出口阀门13为电动调节阀门，系统运行期间根据热网循环水泵5与备用热网循环水泵6的出力变化调节开度。The utility model controls the opening and closing of pipelines in the system through a plurality of control valves. Among them, the heat network circulating water return water master valve 9, the heat network circulating water
本实用新型热电联产机组的热网循环水系统的调节方法，包括以下步骤：The adjusting method of the heating network circulating water system of the cogeneration unit of the utility model comprises the following steps:
-当热网循环水泵5的出口流量小于热网循环水总流量时，启动备用热网循环水泵6、开启备用热网循环水泵出口阀门13，通过调节液力耦合器7的勺管开度，使热网循环水泵5出口流量和备用热网循环水泵6的出口流量相加满足热网循环水总流量的要求；- When the outlet flow of the heat network circulating
-当热网循环水泵5的出口流量大于热网循环水总流量时，停运备用热网循环水泵6、关闭备用热网循环水泵出口阀门13，并通过调节热网循环水泵出口阀门12的开度，以满足热网循环水总流量的要求。- When the outlet flow of the heating network circulating
本实用新型热电联产机组的热网循环水系统调节方法可通过调节液力耦合器勺管开度、以及泵出口电动调门开度，从而保证热网循环水流量和压力的稳定，操作便捷。The adjusting method of the heating network circulating water system of the cogeneration unit of the utility model can ensure the stability of the circulating water flow and pressure of the heating network by adjusting the opening of the spoon tube of the hydraulic coupler and the opening of the electric valve at the pump outlet, and the operation is convenient.
本实用新型通过将热网循环水泵5与锅炉给水泵4同轴布置，共同由水泵汽轮机3进行驱动，从而减少了热网循环水泵汽轮机以及蒸汽管道的设备投资成本，减少了热网循环水泵汽轮机的运行维护成本、检修维护成本，热网首站面积和基建投资成本也将降低。By arranging the heat network circulating
以上所述的具体实施例并不用于限定本实用新型的保护范围，凡在本实用新型的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本实用新型的保护范围之内。The specific embodiments described above are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. within the scope of protection.
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