JP3238818U - A system that recovers and utilizes flue gas from the tail of a waste heat boiler to regulate the water supply temperature of a heating network. - Google Patents

Abstract

A waste heat boiler tail flue gas recovery system and a system for recovering a waste heat boiler tail flue gas to regulate the water supply temperature of a heating network. The system includes a flue gas supply line (1), an air filter (3), an induced draft fan (5), an air distributor (7), a flue gas to flue gas heat exchanger (9), and a flue gas return line (10). , a flue gas distribution pipe 8, a smoke outlet stop plate 17, an air supply electric valve installed in the flue gas supply pipe, an air supply manual valve 16, and an inlet to the induction draft fan inlet pipe 4 An electric door is installed, the outlet pipe 6 is installed with an outlet electric door and a check valve 20, the flue gas distribution pipe is installed with an electric door and an electric adjustment door 22, and the flue gas-flue gas heat exchanger 9 is installed. A motorized door is installed at the water supply port on the circulating water side, and a motorized door is installed at the drain port on the circulating water side of the flue gas-flue gas heat exchanger. [Selection drawing] Fig. 1

Description

This utility model is a system for recovering and utilizing waste heat boiler tail flue gas to adjust the feed water temperature of heating network, and belongs to the field of waste heat boiler tail flue gas recovery and utilization technology.

Conventional technology

BACKGROUND ART The flue gas of a gas turbine waste heat boiler is the flue gas that is discharged to the atmosphere through the waste heat boiler after gas combustion in the gas turbine. Waste heat boiler flue gas discharge flow is gas turbine exhaust → waste heat boiler inlet flue → secondary reheater → high pressure secondary superheater → primary reheater → high pressure primary superheater → high pressure evaporator → Denitrification module space→High pressure tertiary economizer→Medium pressure heater→
Medium pressure evaporator -> low pressure superheater -> high pressure secondary economizer -> medium pressure economizer -> high pressure primary economizer -> low pressure evaporator -> condensed water heater -> outlet flue -> chimney -> release to atmosphere. The exhaust gas temperature of the waste heat boiler is about 90℃, the flue gas flow is about 2000KNm3/h, and the heat of the exhaust gas is very large. With current technology, the waste heat boiler exhaust gas is discharged directly to the atmosphere, and the flue gas utilization is very low and needs to be recovered. In addition, since the gas turbine does not require desulphurization and the NOx is already treated, only the exhaust gas is recovered and heated, and the return water of the circulating water of the heating network is used by steam-water heaters, waste water coolers, Heated by a water-flue-gas-flue-gas heat exchanger, in the back pressure condition, the feedwater temperature of the heating network is regulated by the load of the unit, and the regulation capacity is low. Also, the loss of thermal efficiency of the unit due to the loss of exhaust gas reaches about 9%.

Contents of Utility Model In order to overcome the deficiencies existing in the prior art, the technical problem to be solved by this utility model is to recover and utilize improved waste heat boiler tail flue gas to improve the feed water temperature of heating networks. is to provide a system hardware structure for adjusting the
In order to solve the above technical problems, this utility model adopts the following technical solutions. 1. A system for recovering and utilizing waste heat boiler tail flue gas to regulate the water supply temperature of a heating network, comprising a waste heat boiler tail flue gas supply line, one end of said flue gas supply line being connected to a chimney. The other end of said flue gas supply pipe is connected to the inlet of an air filter, and the outlet of said air filter is connected to the inlet pipe of the induced draft fan through the inlet pipe of the induced draft fan. and the outlet of the induced draft fan is connected to the inlet of the air distributor through the outlet pipe of the induced draft fan, and the outlets of said air distributor are respectively connected to the plurality of smoke through flue gas distribution pipes. connected to a flue gas inlet of a flue gas-to-flue gas heat exchanger, the flue gas outlet of said flue gas-to-flue gas heat exchanger being connected to one end of a flue gas return pipe, said flue gas The other end of the return pipe connects to the pipe behind the chimney stop plate.
The circulating water inlet of said flue gas-to-flue gas heat exchanger is connected to the outlet of a heating network circulating pump through a pipe, and the circulating water outlet of said flue gas to flue gas heat exchanger is connected to a pipe. are connected to the water-water heat exchanger, waste water cooler and steam-water heater respectively.
A first motor-operated valve and a second manual valve are installed in the flue gas supply pipe, a second motor-operated valve is installed in the inlet pipe of the induction draft fan, and a third motor-operated valve is installed in the outlet pipe of the induction draft fan. and a check valve, the flue gas distribution pipe is provided with a fourth motor-operated valve and a motor-operated control door, the flue gas return pipe is provided with a fifth motor-operated valve, the flue gas-flue gas A sixth motor-operated valve and a seventh motor-operated valve are installed in the circulating water supply pipe and the drain pipe of the heat exchanger, respectively. A standby induced draft fan is installed in the piping of the induced draft fan, the first standby electric valve is installed in the piping that connects the standby induced draft fan and the air filter, and the standby induced draft fan and the air distributor are connected. Specifically, three flue gas-flue gas heat exchangers are installed, each of which is equipped with a second backup motor operated valve and a backup check valve in the pipe, and air is supplied through each of the three flue gas distribution pipes. Connected to the distributor, the piping of the circulating water inlet of the three flue gas-flue gas heat exchangers is connected to the outlet of the heating network circulation pump, the circulation of the three flue gas-flue gas heat exchangers. The water outlet piping allows the circulating water to flow into the steam-water heater, the waste water cooler, and the water-water heat exchanger respectively through the main piping. is

Compared with the prior art, the beneficial effects of this utility model are as follows. The heating network system provided by this utility model for enhancing the heat exchange of the exhaust gas of the gas turbine waste heat boiler utilizes the boiler exhaust gas to heat the heating network system after retrofitting, and the exhaust gas of the gas turbine waste heat boiler The gas is forced to flow through a flue gas-to-flue gas heat exchanger via an induced draft fan and is discharged to the atmosphere via a chimney after heat exchange is complete. When it is cold or the heating area is increased, the flue gas in the boiler tail can be used to effectively increase the heating temperature of the heating network, and the heat exchange can be greatly increased under the condition that the circulating water flow of the heating network remains unchanged. to increase the heating efficiency, increase the efficiency of the unit, and when the heating network consumption is insufficient, the exhaust gas heat exchange can be reduced so that the heating temperature does not exceed the limit.

The utility model will now be described in more detail in conjunction with the accompanying drawings.
1 is a schematic diagram of the structure of the present utility model; FIG. [Description of symbols] where: 1 flue gas supply pipe, 2 chimney, 3 air filter, 4 induction draft fan inlet pipe, 5 induction draft fan, 6 induction draft fan outlet pipe, 7 air distributor, 8 flue Gas distribution pipe, 9 flue gas-flue gas heat exchanger, 10 flue gas return, 11 heating network circulation pump, 12 water-water heat exchanger, 13 waste water cooler, 14 steam-water heater, 15 No. 1 motor operated valve, 16 No. 1 manual valve, 17 Smoke outlet stop plate, 18 No. 2 motor valve, 19 No. 3 motor valve, 20 Check valve, 21 No. 4 motor valve, 22 Motor control door, 23 No. 5 motor valve , 24 6th electric valve, 25 5th electric valve, 26 spare induction draft fan piping, 27 spare induction draft fan, 28 1st spare electric valve, 29 2nd spare electric valve, 30 spare check valve .

Specific embodiment As shown in Figure 1, the present utility model is a system for recovering and utilizing the flue gas in the tail of the waste heat boiler to adjust the feed water temperature of the heating network, A supply pipe 1 is provided, one end of said flue gas supply pipe 1 is connected to the pipe in front of the stop plate 17 of the chimney outlet, and the other end of said flue gas supply pipe 1 is connected to the inlet of the air filter 3. and the air filter 3
The outlet of is connected to the inlet of the induced draft fan 5 through the inlet pipe 4 of the induced draft fan,
The outlet of the induced draft fan 5 is connected via the outlet pipe of the induced draft fan 6 to the inlet of the air distributor 7, the outlets of said air distributor 7 respectively via flue gas distribution pipes 8 to the plurality of smoke connected to the flue gas inlet of the flue gas-flue gas heat exchanger 9, the flue gas outlet of said flue gas-flue gas heat exchanger 9 being connected to one end of the flue gas return pipe 10, said The other end of the flue gas return pipe 10 connects to the pipework behind the chimney stop plate 17 .
The circulating water inlet of the flue gas-to-flue gas heat exchanger 9 is connected to the outlet of the heating network circulating pump 11 through a pipe, and the circulating water outlet of the flue gas-to-flue gas heat exchanger 9 is connected. are connected to the water-water heat exchanger 12, the waste water cooler 13 and the steam-water heater 14 respectively through pipes.
A first motor-operated valve 15 and a second manual valve 16 are installed in the flue gas supply pipe 1, a second motor-operated valve 18 is installed in the inlet pipe 4 of the induced draft fan, and an outlet pipe of the induced draft fan. 3 to 6
A motor-operated valve 19 and a check valve 20 are installed, the flue gas distribution pipe 8 is installed with a fourth motor-operated valve 21 and a motor-operated control door 22, and the flue gas return pipe 10 is installed with a fifth motor-operated valve 23. , a sixth electric valve 24 and a seventh electric valve 25 are installed in the circulating water supply pipe and the water discharge pipe of the flue gas-flue gas heat exchanger 9, respectively.
A pipe 26 for a backup induction draft fan is installed between the air filter 3 and the air distributor 7,
A preliminary induction draft fan 27 is installed in the piping 26 of the standby induction draft fan, a first spare electric valve 28 is installed in the piping connecting the standby induction draft fan 27 and the air filter 3, and a preliminary induction draft fan 28 is installed. A second backup electric valve 29 and a backup check valve 30 are installed in the pipe connecting the fan 27 and the air distributor 7 .
The flue gas-flue gas heat exchangers 9 are specifically installed in three, each connected to the air distributor 7 through three flue gas distribution pipes 8, and three flue gas-flue gas The circulating water inlet piping of the heat exchanger 9 is connected to the outlet of the heating network circulating pump 11, and the circulating water outlet piping of the three flue gas-to-flue gas heat exchangers 9 is connected via the main piping. steam-water heaters 14, respectively, for circulating water;
It flows into the wastewater cooler 13 and the water-water heat exchanger 12 .
The chimney exit stop plate is specifically an electric stop plate.
The system for recovering and utilizing waste heat boiler tail flue gas to regulate the feed water temperature of the heating network provided by this utility model comprises a flue gas-to-flue gas heat exchanger 9, connected to the waste heat boiler tail a flue gas supply pipe 1, an air filter 3, an induced draft fan 5,
air distributor 7, flue gas-to-flue gas heat exchanger 9, flue gas distribution pipe 8, flue gas return pipe 1
0, the connection port of the flue gas supply pipe 1 is installed in the chimney 2 in front of the stop plate 17 of the chimney outlet, and the flue gas supply pipe 1 is provided with a first manual valve 16 and a first electric valve 15. installed, the flue gas is connected to the air filter 3 through the flue gas supply pipe 1, the air filter 3 is connected to the induced draft fan 5 through the pipe 4 at the inlet of the induced draft fan, and the Second motor operated valve 18 on pipe 4
is installed, one induced draft fan 5 is running, one is for spare, the outlet of the induced draft fan is connected to the air distributor 7 through the pipe 6 of the induced draft fan outlet, and the induced draft fan A third motor operated valve 19 and a check valve 20 are installed in the outlet pipe 6 to connect the air distributor 7 and the flue gas
A flue gas heat exchanger 9 is connected via a flue gas distribution pipe 8 to which a fourth motor operated valve 21 is connected.
and a motorized control door 22 are installed, one end of the flue gas return pipe 10 is a flue gas-flue gas heat exchanger
9, the other end of the connection port is the pipe behind the stop plate 17 of the smoke outlet, the outlet to the flue gas return pipe 10, the outlet to the flue gas return gas pipe 10, the outlet of the flue gas return gas A fifth motor-operated valve 23 is installed, a sixth motor-operated valve 24 is installed at the water supply port on the circulating water side of the flue gas-flue gas heat exchanger 9, and the flue gas-flue gas heat exchanger 9 is A seventh electric valve 25 is installed at the water outlet on the circulating water side. The return water of the heating network enters the flue gas-flue gas heat exchanger 9 via the circulating water pump 11 of the heating network for heating, the heated water again enters the water-water heat exchanger 12, the waste water cooling. Vessel 13, Steam-
Enter the water heater 14 to heat and supply water. This utility model can use the boiler exhaust gas to heat the heating network to supply water, and when the heating network requires high water supply temperature, the frequency of the induction draft fan 5 is increased to distribute the flue gas. It can be realized by increasing the opening degree of the electric adjustment door 22, decreasing the opening degree of the stopping plate 17 of the chimney outlet, and increasing the heat supply. If the heating network requires a lower feed water temperature, the frequency of the induced draft fan 5 should be reduced, the opening of the motorized control door 22 that distributes the flue gas should be reduced, and the chimney stop plate 17 should be increased. , can be achieved by reducing the heat supply, the heating temperature of the heating network can be adjusted flexibly, increasing the efficiency of the unit.

The method of carrying out this utility model is as follows.
The first motor operated valve 15 at the inlet of the flue gas supply pipe 1, the first manual valve 16, the first at the inlet of the induction draft fan 5
2 motor-operated valve 18, the third motor-operated valve at the outlet of the induction draft fan 5, the fourth motor-operated valve 21 at the flue gas distribution pipe 8,
Open the fifth motor operated valve 23 of the flue gas return line 10 .
3) start the induced draft fan 4 at a variable frequency and regulate the total flue gas flow through the variable frequency fan to each flue gas-to-flue gas heat exchanger 9 through the flue gas distribution pipe 8; Adjust the incoming flue gas flow rate.
4) Adjust the flue gas inlet pressure by changing the opening of the chimney outlet stop plate 17;
4) Open the sixth motor operated valve 24 of the circulating water supply of the flue gas-flue gas heat exchanger 9;
5) open the seventh motor operated valve 25 for the return water of the flue gas-flue gas heat exchanger 9;
Regarding the specific structure of this utility model, the connection relationship between the modules of each part adopted in this utility model is clear and achievable. , solves the technical problem proposed by this utility model on the premise that the corresponding technical effect can be achieved and does not depend on the execution of the corresponding software. Unless specifically stated, the parts, modules, and models of the particular components, method of connection, shown in this utility model are subject to publication of patents, journal articles, and general publications available to persons skilled in the art prior to the filing date. It belongs to the existing technology such as technical knowledge and is not further explained here, which makes the technical solution provided in this utility model clear, complete and achievable, according to this technical means Corresponding physical product can be reproduced or obtained.
Finally, it should be understood that the above embodiments are for describing the technical solutions of the present utility model and not for limiting the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art may modify the technical solutions described in the foregoing embodiments or Equivalent permutations can be performed with These modifications or replacements do not deviate the essence of the corresponding technical solution from the scope of the technical solution of each embodiment of the present utility model.

Claims (4)

1. A system for recovering and utilizing waste heat boiler tail flue gas to regulate the water supply temperature of a heating network, comprising a waste heat boiler tail flue gas supply line, one end of said flue gas supply line being connected to a chimney. The other end of said flue gas supply pipe is connected to the inlet of an air filter, and the outlet of said air filter is connected to the inlet pipe of the induced draft fan through the inlet pipe of the induced draft fan. and the outlet of the induced draft fan is connected to the inlet of the air distributor through the outlet pipe of the induced draft fan, and the outlets of said air distributor are respectively connected to the plurality of smoke through flue gas distribution pipes. connected to the flue gas inlet of the flue gas-to-flue gas heat exchanger,
The flue gas outlet of said flue gas-to-flue gas heat exchanger is connected to one end of the flue gas return pipe and the other end of said flue gas return pipe is connected to the pipe behind the flue stop plate. ,
The circulating water inlet of said flue gas-to-flue gas heat exchanger is connected to the outlet of a heating network circulating pump through a pipe, and the circulating water outlet of said flue gas to flue gas heat exchanger is connected to a pipe. connected to the water-water heat exchanger, waste water cooler and steam-water heater respectively via
A first motor-operated valve and a second manual valve are installed in the flue gas supply pipe, a second motor-operated valve is installed in the inlet pipe of the induction draft fan, and a third motor-operated valve is installed in the outlet pipe of the induction draft fan. and a check valve, the flue gas distribution pipe is provided with a fourth motor-operated valve and a motor-operated control door, the flue gas return pipe is provided with a fifth motor-operated valve, the flue gas-flue gas A sixth motor-operated valve and a seventh motor-operated valve are installed in the circulating water supply pipe and the drain pipe of the heat exchanger, respectively. A system for recovering and utilizing waste heat boiler tail flue gas to regulate the temperature of water supply in a heating network according to claim 1, wherein a standby induced draft fan is piped between said air filter and air distributor. is installed, a spare induction draft fan is installed in the spare pipe of the induction draft fan, and a second pipe is installed in the pipe connecting the spare induction draft fan and the air filter
1 A spare electric valve is installed, and a second
A backup electric valve and a backup check valve are installed. A system for recovering and utilizing flue gas in the tail of a waste heat boiler to regulate the feedwater temperature of a heating network according to claim 1, wherein said flue gas-to-flue gas heat exchangers are specifically composed of three installed and connected to the air distributor via 3 flue gas distribution pipes respectively, and the pipes of the circulating water inlets of the 3 flue gas-flue gas heat exchangers are connected to the outlets of the heating network circulating pumps. , the pipes of the three flue gas-flue gas heat exchanger circulating water outlets let the circulating water flow into the steam-water heater, the waste water cooler and the water-water heat exchanger respectively through the main pipes. It is characterized by A system for recovering and utilizing waste heat boiler tail flue gas to regulate water supply temperature of heating network according to claim 1, wherein said chimney outlet stop plate is specifically an electric stop plate. It is characterized by

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