CN201417093Y - Waste heat boiler heat recovery system for glass production line - Google Patents

Abstract

The utility model discloses a heat recovery system, in particular to a heat recovery system for a waste heat boiler used in a glass production line, and the waste heat utilization efficiency is higher. In this system, a waste heat flue and a waste heat boiler are connected between the regulating door on the main flue and the large gate. A main flue superheater is arranged between them, and the inlet end and outlet end of the working fluid pipeline of the main flue superheater are respectively connected to the outlet end of the waste heat boiler working medium pipeline and the inlet end of the working medium pipeline of the heat user. In the case of using the waste heat to generate electricity, the power of the waste heat power generation can be increased by 10% to 20%. The main flue superheater adopts a wall-wrapped main flue superheater composed of membrane heat exchange fins and a rigid structural frame, which reduces the investment cost of the glass production line and can be widely used in the transformation of the heat recovery system of the waste heat boiler in the existing glass production line And new production lines are under construction.

Description

Waste heat boiler heat recovery system for glass production line

technical field

The utility model relates to a heat recovery system, in particular to a waste heat boiler heat recovery system used in a glass production line.

Background technique

At present, the existing waste heat boiler used in the glass production line is connected to the glass production line as shown in Figure 1. The high-temperature flue gas generated by the kiln enters the main flue after heat exchange through the heat storage tank, and then passes through the regulating door and the large gate in turn. It enters the chimney and is discharged into the atmosphere by the natural suction of the chimney. The flue gas discharged into the atmosphere has relatively high heat. In order to make full use of this part of heat and achieve the purpose of energy saving and emission reduction, a waste heat flue is installed behind the regulating door and the large gate is closed. The high-temperature flue gas enters the main flue through the heat storage tank, enters the waste heat flue through the regulating door, passes through the waste heat boiler inlet shutter door, waste heat boiler, induced draft fan, waste heat boiler outlet shutter door, and finally enters the chimney and is discharged into the atmosphere. When the heat of the flue gas passes through the waste heat boiler, it is exchanged to the working fluid of the waste heat boiler, and the heated working medium is sent to heat users such as steam turbine generator for power generation or heating.

The waste heat boiler is also called heat recovery steam generator. Unlike conventional boilers, there is no combustion process in the waste heat boiler, and there is no combustion-related equipment. In essence, it is just a gas check? Steam heat exchanger.

Above-mentioned existing main flue is made up of refractory brick, insulation brick, common brick etc., and structure is complicated, and investment is high. Since the outlet temperature of the heat storage tank is about 600°C, if the refractory bricks are kept at such a high temperature for a long time, the maintenance cost of the refractory bricks will be high. Therefore, in the design of the glass production line, the heat preservation effect is intentionally reduced to allow part of the heat to be dissipated. According to actual measurements At the interface point of the waste heat flue, the temperature of the main flue is only 450-530°C, and the heat loss is very large.

Utility model content

The technical problem to be solved by the utility model is to provide a waste heat boiler heat recovery system with higher waste heat utilization efficiency for a glass production line.

The technical scheme adopted by the utility model to solve its technical problems is: the waste heat boiler heat recovery system used in the glass production line, the waste heat flue and the waste heat boiler are connected between the regulating door on the main flue and the large gate, and the waste heat boiler works The outlet end of the gas pipeline is connected with the working fluid inlet port of the main flue superheater, the working fluid outlet port of the main flue superheater is connected with the heat user, and the working fluid outlet port of the heat user is connected with the working fluid inlet port of the waste heat boiler.

Furthermore, the main flue superheater adopts a wall-wrapped main flue superheater composed of membrane heat exchange fins and a rigid structural frame.

The beneficial effects of the utility model are: by setting the main flue superheater between the inlet end of the main flue and the regulating door, this part of heat can be fully utilized to further heat the working fluid from the saturation temperature to the designed superheating temperature, ensuring Under the condition of constant pressure and temperature, the main steam output can be effectively increased, thereby improving the cycle heat efficiency of the entire power plant or the heat use efficiency of heat users. The main flue superheater is installed at the position of the main flue in front of the regulating door, which can replace the main flue of the glass production line. When the waste heat system is used to generate electricity, the power of waste heat power generation can be increased by 10% to 20%. The main flue superheater adopts a wall-wrapped main flue superheater composed of membrane heat exchange fins and a rigid structural frame, so that refractory bricks, insulation bricks, and ordinary bricks are no longer used here, which reduces the investment cost of the glass production line and can It is widely used in the transformation of the heat recovery system of the waste heat boiler of the existing glass production line and the construction of a new production line.

Description of drawings

Figure 1 is a schematic diagram of an existing waste heat boiler heat recovery system used in a glass production line;

Fig. 2 is a schematic diagram of the waste heat boiler heat recovery system used in the glass production line of the present invention, and the direction of the arrow in the figure is the direction of flue gas flow;

Fig. 3 is a schematic diagram of the working medium circulation of the heat recovery system of the waste heat boiler in the present invention, and the direction of the arrow in the figure is the flow direction of the working medium;

Fig. 4 is a schematic cross-sectional view of the main flue superheater in the utility model.

The marks in the figure are: main flue 1, regulating door 2, large gate 3, waste heat flue 4, waste heat boiler 5, heat user 6, main flue superheater 7, gate 8.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, in the existing waste heat boiler heat recovery system used in the glass production line, a waste heat flue 4 and a waste heat boiler 5 are connected between the regulating door 2 and the large gate 3 on the main flue 1, and the waste heat flue When the high-temperature flue gas in 4 passes through the flue gas channel of the waste heat boiler 5 , the heat of the flue gas is exchanged to the working fluid of the waste heat boiler 5 . The inlet and outlet ends of the working medium pipeline of the waste heat boiler 5 are connected to the heat user 6, and the heated working medium is therefore sent to the heat user such as steam turbine generator for power generation or heating. The waste heat boiler 5 usually uses water as a working medium.

In order to improve the waste heat utilization efficiency, as shown in Fig. 2 to Fig. 4, the heat recovery system of the present invention is provided with a main flue superheater 7 between the inlet end of the main flue 1 and the regulating door 2, and further transfers the working fluid Further heating from saturation temperature to superheating temperature. The outlet end of the working medium pipeline of the waste heat boiler 5 is connected to the working medium inlet end of the main flue superheater 7. The inlet end and the outlet end of the working medium pipeline of the device 7 are respectively connected to the outlet end of the working medium pipeline of the waste heat boiler 5 and the inlet end of the working medium pipeline of the heat user 6 .

In order to further reduce the investment cost of the glass production line and the maintenance cost of the main flue 1, and at the same time improve the utilization efficiency of residual heat, as shown in Figure 4, the main flue superheater 7 adopts a wall consisting of membrane heat exchangers and rigid structural frames Type main flue superheater, thereby replacing the main flue 1 in the place of the glass production line. At the same time, the outer surface of the main flue superheater 7 is wrapped with light thermal insulation material, which is beneficial to heat insulation and heat preservation, and further improves the utilization efficiency of residual heat.

Usually, both the flue gas inlet and outlet of the waste heat boiler 5 are provided with shutter doors 8, which are all prior art, and will not be repeated here.

In the above technical solution, the flow of high temperature flue gas is shown in Figure 2. After the high-temperature flue gas enters the heat storage tank for heat exchange, it enters the main flue superheater 7 on the main flue 1, then passes through the regulating door 2, the shutter door 8 at the front end of the waste heat boiler 5, the waste heat boiler 5, and finally passes through the induced draft fan into the chimney.

In the above technical scheme, the working fluid circulation process of the waste heat boiler heat recovery system is shown in Figure 3. The working fluid is pumped into the economizer by the feed water pump in the waste heat boiler 5, and enters the steam drum after heat exchange with the flue gas , the working medium in the steam drum enters the water-cooled evaporator, and after heat exchange with the flue gas, it becomes a mixture of saturated water and saturated steam and enters the steam drum, and the saturated steam working medium enters the main flue set at the front end of the main flue from the top of the steam drum The superheater 7 becomes the superheated working medium after heat exchange, and then inputs the heat to the user 6, such as the steam turbine works to drive the generator to generate electricity, etc. The exhausted steam working medium after the work enters the condenser, and becomes condensed water after being cooled by circulating water. The condensed water working medium is pumped into the deaerator by the condensate pump, and the deaerated feed water working medium is pumped into the economizer by the feed water pump to start the next working medium cycle.

Claims (4)

1. The waste heat boiler heat recovery system used in the glass production line, the waste heat flue (4) and the waste heat boiler (5) are connected between the regulating door (2) and the large gate (3) on the main flue (1), It is characterized in that: a main flue superheater (7) is arranged between the inlet end of the main flue (1) and the regulating door (2), and the outlet end of the working fluid pipe of the waste heat boiler (5) is overheated with the main flue The working medium inlet port of the main flue superheater (7) is connected to the heat user (6), and the working medium outlet port of the heat user (6) is connected to the working medium inlet port of the waste heat boiler (5). connect. 2. The waste heat boiler heat recovery system for glass production line according to claim 1, characterized in that: the main flue superheater (7) adopts a wall-wrapped main flue composed of membrane heat exchange fins and a rigid structural frame superheater. 3. The waste heat boiler heat recovery system for glass production line according to claim 2, characterized in that: the outer surface of the main flue superheater (7) is wrapped with light heat insulating material. 4. The waste heat boiler heat recovery system for glass production line as claimed in claim 1, 2 or 3, characterized in that: both the flue gas inlet and outlet of the waste heat boiler (5) are provided with shutter doors (8) .

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