CN211119306U - Soot blowing drainage recovery energy-saving system - Google Patents

Abstract

The utility model relates to a soot blowing drainage recovery energy-saving system, which relates to the field of pulverized coal boiler energy conservation, in particular to a soot blowing drainage recovery energy-saving system, comprising a boiler soot blowing drainage pipeline, an auxiliary steam pipeline and a deaerator, wherein the deaerator is connected with a boiler water supply system through a water pump, and the boiler soot blowing drainage pipeline is connected with an atmosphere flash tank through a third electric gate valve; the auxiliary steam pipeline is connected with an inlet of the secondary air heater through a first electric gate valve, the soot blowing drain pipeline is connected with an inlet of the secondary air heater through a second electric gate valve, and an outlet of the secondary air heater is connected with a drain tank of the air heater through a drain; the utility model discloses simple structure, blow the ash of boiler and blow hydrophobic process overgrate air fan heater entering fan heater steam trap incasement, improved overgrate air entry wind-warm syndrome to improve filterable efficiency, and then improve boiler operation economic nature.

Description

A soot blowing hydrophobic recovery energy-saving system

technical field

The utility model relates to the field of energy saving of pulverized coal boilers, in particular to a soot blowing hydrophobic recovery energy saving system.

Background technique

The soot blowing drain of coal-fired boilers is generally discharged to the atmospheric expansion container. After expansion and condensation, the water quality is qualified and then recycled. However, since the hydrophobic temperature is generally above 200 °C, a large amount of working fluid and heat will be lost after the above process, resulting in huge economic losses. If this part of the working fluid and heat is recycled, the economic income can be increased by more than 1.5 million per year.

Utility model content

In order to solve the above problems, the utility model provides a water-blowing and hydrophobic recovery energy-saving system with a simple structure and capable of realizing the recycling and utilization of soot-blowing and hydrophobic working fluid and heat.

The utility model relates to a soot-blowing and drain-recovery energy-saving system, which comprises a boiler soot-blowing drain line, an auxiliary steam line and a deaerator. The deaerator is connected to a boiler water supply system through a water pump; The gate valve is connected with the atmospheric expansion container;

The auxiliary steam pipeline is connected with the secondary air heater through the first electric gate valve, the first electric gate valve is connected with the inlet of the secondary air heater, and the soot blowing drain pipeline is connected with the secondary air heater through the second electric gate valve. The inlet of the fan is connected, and the outlet of the secondary air heater is connected with the heater drain box through the steam trap;

The heater drain box is connected to a heater drain pump through a fourth electric gate valve, and the heater drain pump is connected to the deaerator.

Preferably, a safety door and a steam exhaust valve are provided on the drain box of the heater.

Preferably, an external liquid level gauge is also provided on the drain box of the heater.

Preferably, a fifth electric gate valve is further arranged between the heater drain pump and the deaerator.

Preferably, two valves are connected in series on the pipeline where the steam trap is located, and the steam trap is located between the two valves;

It also includes a bypass valve, the secondary air heater is connected with the heater drain box through the bypass valve, and the bypass valve is connected in parallel with the two valves and the steam trap.

The utility model has a simple structure, and the soot blowing drain of the boiler enters the drain box of the heater through the secondary air heater, thereby increasing the inlet air temperature of the secondary air, thereby improving the filtering efficiency and further improving the operation economy of the boiler.

In the utility model, the boiler soot blowing drain passes through the heater drain box, and is then returned to the deaerator by the heater drain pump connected with the heater drain box, which effectively recovers the soot blowing drain and improves the boiler water quality recovery. Rate.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

Reference numerals: 1- auxiliary steam line, 2- boiler soot blowing drain line, 3- atmospheric expansion vessel, 4- secondary air heater, 5- steam trap, 6- air heater drain box, 7- liquid level Gauge, 8- air heater drain pump, 9- deaerator, 10- first electric gate valve, 11- second electric gate valve, 12- third electric gate valve, 13- fourth electric gate valve, 14- fifth electric gate valve .

Detailed ways

The utility model is a soot blowing and draining recovery energy-saving system, which comprises a boiler soot blowing drain line 2, an auxiliary steam line 1 and a deaerator 9. The deaerator 9 is connected to a boiler feed water system through a water pump, and the boiler soot blowing drain line 2 The air expansion container 3 is connected to the upper through the third electric gate valve 12;

The auxiliary steam pipeline 1 is connected with the secondary air heater 4 through the first electric gate valve 10, the first electric gate valve 10 is connected with the inlet of the secondary air heater 4, and the soot blowing drain pipeline passes through the second electric gate valve. 11 is connected with the inlet of the secondary air heater 4, and the outlet of the secondary air heater 4 is connected with the heater drain box 6 through the steam trap 5;

The heater drain box 6 is connected to a heater drain pump 8 through a fourth electric gate valve 13 , and the heater drain pump 8 is connected to the deaerator 9 .

A safety door and an exhaust valve are arranged on the air heater drain box 6 .

An external liquid level gauge 7 is also arranged on the drain box 6 of the heater.

A fifth electric gate valve 14 is also arranged between the heater drain pump 8 and the deaerator 9 .

Two valves are connected in series on the pipeline where the steam trap 5 is located, and the steam trap 5 is located between the two valves;

A bypass valve is also included, the secondary air heater 4 is connected to the heater drain box 6 through the bypass valve, and the bypass valve is connected in parallel with the two valves and the steam trap 5 .

In the process of heating the boiler before soot blowing, close the first electric gate valve 10 on the auxiliary steam line 1, close the soot blowing drain in the boiler soot blowing drain line 2, and flow to the third electric gate valve 12 in the atmospheric expansion vessel 3, and open the boiler blowing drain. The electric gate valve 11 between the soot blowing and draining lines 2 is used to warm the pipes of the soot blowing system. The steam passes through the boiler soot blowing and draining lines 2 to warm the pipes and then enters the secondary air heater 4 for heat exchange, and then condenses into water and enters through the steam trap 5. The heater draining box 6, the draining temperature is above 80°C, and then the heater draining pump 8 connected to the heater draining box 6 returns to the deaerator 9 and enters the water supply system. After heating the pipe, close the second electric gate valve 11, open the first electric gate valve 10, and perform boiler soot blowing. After the soot blowing is completed, open the third electric gate valve 12, and the steam in the boiler soot blowing drain line condenses naturally and passes through the third electric gate valve. The electric gate valve 12 is discharged into the atmospheric expansion container 3 .

The utility model has a simple structure, and the soot blowing drain of the boiler enters into the drain box 6 of the heater through the secondary air heater 4, thereby increasing the inlet air temperature of the secondary air, thereby improving the filtering efficiency and further improving the boiler operation economy.

In the utility model, the boiler soot blowing drain passes through the heater drain box 6, and is then returned to the deaerator 9 by the heater drain pump 8 connected to the heater drain box 6, which effectively recovers the soot blowing drain and improves the performance of the boiler. Boiler water quality recovery rate.

Claims (5)

1. A soot blowing drainage recovery energy-saving system comprises a boiler soot blowing drainage pipeline (2), an auxiliary steam pipeline (1) and a deaerator (9), wherein the deaerator (9) is connected with a boiler water supply system through a water pump, and the boiler soot blowing drainage pipeline (2) is connected with an atmosphere flash tank (3) through a third electric gate valve (12);

it is characterized in that the preparation method is characterized in that,

the auxiliary steam pipeline (1) is connected with a secondary air heater (4) through a first electric gate valve (10), the first electric gate valve (10) is connected with an inlet of the secondary air heater (4), the soot blowing drain pipeline is connected with an inlet of the secondary air heater (4) through a second electric gate valve (11), and an outlet of the secondary air heater (4) is connected with a heater drain tank (6) through a drain device (5);

the steam trap drain tank (6) of the air heater is connected with a steam trap drain pump (8) of the air heater through a fourth electric gate valve (13), and the steam trap drain pump (8) of the air heater is connected with the deaerator (9).

2. The soot blowing drainage recovery energy-saving system as set forth in claim 1, wherein a safety door and an exhaust valve are provided on the heater drain box (6).

3. The soot blowing drainage recovery energy-saving system as set forth in claim 2, characterized in that an external liquid level meter (7) is further provided on the heater drain tank (6).

4. The soot blowing drainage recovery energy-saving system as set forth in claim 3, characterized in that a fifth electric gate valve (14) is further arranged between the heater drainage pump (8) and the deaerator (9).

5. The soot blowing drainage recovery energy-saving system as set forth in claim 4, wherein the pipeline where the steam trap (5) is located is connected with two valves in series, and the steam trap (5) is located between the two valves;

the secondary air heater is characterized by further comprising a bypass valve, the secondary air heater (4) is connected with a drain box (6) of the air heater through the bypass valve, and the bypass valve is connected with the two valves and the drain device (5) in parallel.

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