CN201652566U - An asymmetric series heating device - Google Patents

Abstract

The utility model discloses an asymmetrical series heating device which belongs to the technical field of energy and can reduce the pressure of heating and extracting steam of a heating unit. The heating and extraction control valves of the two heating units are connected to a heating network heater respectively, and the two heating network heaters are asymmetrically connected in series. The utility model adopts an asymmetrical series heating device to reduce the heat supply and steam extraction pressure of the heating unit, realize the step-by-step heating of the circulating water, and use the energy in steps. Compared with the conventional parallel arrangement, the utility model has the same heat supply Under the circumstances, the outlet temperature of the circulating water can be increased; the heating and extraction pressure of the first heating unit can be reduced, which greatly reduces the heating and extraction pressure of the heating unit and increases the power generation of the unit. Under certain circumstances, more power can be generated and the economic benefits of thermal power plants can be increased.

Description

An asymmetric series heating device

technical field

The utility model belongs to the field of energy technology. In particular, it relates to an asymmetric series heating device capable of reducing the pressure of heating and extracting steam of a heating unit.

Background technique

At present, the layout of domestic heating units is mainly characterized by the parallel arrangement of heating network heaters as heating devices. In the parallel arrangement system of two heating devices (heating network heaters), the heating and extraction of each heating unit takes A heat supply device, a schematic diagram of a parallel arrangement heating device as shown in Figure 1, the second-stage heat network heater 3 and the first-stage heat network heater 4 are connected in parallel. When the two heating devices are running in parallel, the two heating units have no influence on the two heating devices. The heating and extraction parameters of each heating unit are the same, and the extraction pressure is the same. The heating of the circulating water The temperature is the same, but to provide hot water with a relatively high temperature, the heating extraction pressure of the heating unit is required to be relatively high. There is also a series arrangement, that is, two heating devices are arranged in series, in which, each heating unit has a heating device for heating and extraction, but the heating temperature of the circulating water is different, which is step by step Heating, cascade utilization of energy, can provide hot water with relatively high temperature.

Utility model content

The purpose of this utility model is to provide a non-standard heating system for the prior art that adopts the parallel arrangement of two heating devices to provide hot water with a relatively high temperature, and the heating and extraction pressure of the heating unit is relatively high. The symmetrical series heating device is characterized in that the heating extraction control valves of the two heating units are respectively connected to a heating network heater, and the two heating network heaters are connected in series.

The two heating network heaters are connected in asymmetrical series connection, that is, the heat exchange areas of the heating network heaters of the two heating units are different, and other structural parameters are the same.

The beneficial effect of the utility model is that the asymmetric series heating device reduces the heating and extraction pressure of the heating unit, realizes the step-by-step heating of the circulating water, and uses the energy in steps. In the case of the same quantity, the outlet temperature of circulating water can be increased; and the area of the second-stage heat network heater carried by the first heating unit can be appropriately increased to reduce the heating and extraction pressure of the first heating unit, which greatly reduces the The heat supply and steam extraction pressure of the heating unit increases the power generation of the unit. Under the same heat supply, it can generate more power and increase the economic benefits of the thermal power plant.

Description of drawings

Fig. 1 is a schematic diagram of a heating device arranged in parallel.

Fig. 2 is a schematic diagram of a heating device arranged in series.

Symbols in the figure:

1-First heating unit; 2-Second heating unit; 3-Second stage heating network heater; 4-First stage heating network heater.

Detailed ways

The utility model provides an asymmetric series heating device. Below in conjunction with accompanying drawing and example the utility model is described.

Figure 2 is a schematic diagram of a heating device arranged in series. The heat supply and extraction control valve of the first heating unit is connected to the second-stage heat network heater 3. The heat supply and extraction control valve of the second heat supply unit 2 is connected to the first-stage heat network heater 4, and the second-stage heat network is heated The device 3 and the first-stage heat network heater 4 are asymmetrically connected in series. The two heating network heaters are connected in an asymmetrical series connection, that is, the heat exchange areas of the heating network heaters of the two heating units are different, and other structural parameters are the same. The heat exchange area of the heat network heater is larger than that of the first-stage heat network heater of another heating unit, which increases the heat transfer performance of the second-stage heat network heater and makes the second-stage heat network The extraction pressure required by the heater to heat the hot network water is reduced

The operation process of the heating device is as follows, taking a 200MW heating unit as an example:

If the parallel heating mode is used, referring to Figure 1, the water volume of each heating network heater is 528kg/s, the inlet temperature is 70°C, the outlet temperature is 125°C, and the heating and extraction pressure of each heating unit is 0.33 MPa, flow rate 360t/h.

If the heating mode in series is adopted, when the heating network supply and return water temperature is 125/70°C, referring to Figure 2, the circulating water volume of the first stage heating network heater 4 connected to the second heating unit is 1056kg/s, The inlet temperature of circulating water is 70°C, the outlet temperature is 97.5°C, the extraction pressure of the first-stage heating unit is 0.21MPa, and the flow rate is 360t/h; the circulation of the second-stage heat network heater 3 connected to the first heating unit The water volume is 1056kg/s, the inlet temperature is 97.5°C, the outlet temperature is 125°C, the extraction pressure of the first-stage heating unit is 0.33MPa, and the flow rate is 360t/h.

Claims (2)

1. An asymmetric series heating device, characterized in that the heating and steam extraction control valves of the two heating units are each connected to a heating network heater, and the two heating network heaters are connected in series; that is, the first heating The heat supply and extraction control valve of the unit is connected to the second-stage heat network heater (3), and the heat supply and extraction control valve of the second heat supply unit (2) is connected to the first-stage heat network heater (4). 2. The asymmetric series heating device according to claim 1, characterized in that, the second-stage heat network heater (3) and the first-stage heat network heater (4) are asymmetrically connected in series.

Images