CN203420788U

CN203420788U - Gas supply system of low-calorific-value industrial gas turbine

Info

Publication number: CN203420788U
Application number: CN201320741994.3U
Authority: CN
Inventors: 唐令; 兰文龙; 胡祥东
Original assignee: Middle Energy-Saving Industrial Power Conservation Ltd; CHONGQING CECEP SANFENG ENERGY Co Ltd
Current assignee: Middle Energy-Saving Industrial Power Conservation Ltd; CHONGQING CECEP SANFENG ENERGY Co Ltd
Priority date: 2013-11-22
Filing date: 2013-11-22
Publication date: 2014-02-05
Anticipated expiration: 2023-11-22

Abstract

The utility model discloses a gas supply system of a low-calorific-value industrial gas turbine, belonging to the field of the gas turbine. The gas supply system comprises a coke oven gas (COG) supply pipeline and a combustion chamber connected with the COG supply pipeline, wherein the COG supply pipeline is sequentially provided with a COG filter screen, a COG isolation valve and a COG flow control valve; a blast furnace gas (BFG) purge and supply pipeline is sequentially provided with a BFG inlet valve, a BFG check valve and a BFG filter screen; a sealed N2 gas supply pipeline is provided with an N2 seal valve and an N2 check valve; the COG supply pipeline arranged between the COG flow control valve and the BFG filter screen is provided with a BFG cut off valve; the N2 gas supply pipeline is connected with the COG supply pipeline arranged between the COG flow control valve and the BFG cut off valve. The existing on-duty gas supply system of the gas turbine is designed again, the supply of BFG and sealed N2 is added again based on the original system, the original on-duty fuel is replaced by the BFG, and the BFG is used as a purge gas source of the gas supply system, so that the reliability and the stability of the operation of the gas turbine are improved.

Description

Lower calorific value industrial gas gas turbine gas supply system

Technical field

The utility model belongs to gas turbine technology field, is specifically related to lower calorific value industrial gas gas turbine gas supply system.

Background technique

In recent years, new and effective gas steam combined cycle for power generation technology (CCPP) is widely used in each large-scale iron and steel enterprise, CCPP is usingd low combustion value furnace gas that steel mill blast furnace produces as fuel, after burning, promote turbine blade, the generating of driving generator, the high-temperature tail gas of discharging can be used for heating waste heat nest stove, the Steam Actuation gas-turbine producing generates electricity again, heat energy is carried out to secondary recovery, form a combined cycle system, its thermal efficiency is high, effects of energy conservation and environmental protection is remarkable, is subject to each iron and steel enterprise's favor.Although CCPP along with the improving constantly of production requirement, has had the appearance of gas turbine null value class technology in application process, harsh to system requirements, usually restrict the stable operation of power plant for self-supply.Wherein, maximum restraining factors are exactly gas quality, especially the impurity of coke-stove gas own is more, be difficult to the features such as purification, its quality does not reach gas turbine requirement, causes equipment accident frequently to occur, such as because coke-stove gas flow is less, the actual conditions such as conveyance conduit is thinner, in use still there will be the problems such as line clogging, nozzle local superheating.

Model utility content

The technical problems to be solved in the utility model is to provide the lower calorific value industrial gas gas turbine gas supply system that a kind of equipment failure rate is low.

In order to solve the problems of the technologies described above, the utility model provides following technological scheme: lower calorific value industrial gas gas turbine gas supply system, comprise COG steam line and connected firing chamber, on described COG steam line, be sequentially provided with COG filter screen, COG separating valve, COG flow control valve, also comprise that BFG purges steam line and sealing N ₂steam line; BFG purges on steam line and is provided with successively BFG suction valve, BFG safety check and BFG filter screen; Sealing N ₂steam line is provided with N ₂seal valve and N ₂safety check; COG steam line between COG flow control valve and BFG filter screen is provided with BFG cut-off valve, N ₂steam line connects the COG steam line between COG flow control valve and BFG cut-off valve.

Technique scheme is that existing gas turbine air supply system on duty is redesigned, and has again increased BFG and sealing N on the basis of original system ₂supply, by the former blast furnace gas that is replaced by for fuel on duty, and the source purge gas with blast furnace gas as air supply system, thereby solved the blockage problem of coke oven gas pipe and nozzle, improve the reliability and stability of gas turbine operation, also reduced accident rate and the fuel cost of complete equipment; Reduce unit and jump, shut down number of times, save power plant's operating cost simultaneously.The supply of sealing N2 makes, when carrying out BFG purging, with N2, COG to be sealed, and prevents that COG from revealing and causing pollution of atmosphere, and periphery staff's life safety is threatened.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:

Fig. 1 is the structural representation of the utility model lower calorific value industrial gas gas turbine gas supply system.

Embodiment

As shown in Figure 1, lower calorific value industrial gas gas turbine gas supply system, comprise COG steam line and connected firing chamber 1, on COG steam line, be sequentially provided with COG filter screen 9, COG separating valve 8, COG flow control valve 7, the front end of COG filter screen 9 is connected with COG compressor 10, BFG purges steam line and is communicated with BFG compressor 2, and is provided with successively BFG suction valve 3, BFG safety check 4 and BFG filter screen 5; Sealing N ₂steam line is provided with N ₂seal valve 12 and N ₂safety check 13, is communicated with N ₂compressor 11; COG steam line between COG flow control valve 7 and BFG filter screen 5 is provided with BFG cut-off valve 6, and N2 steam line is connected on the COG steam line between COG flow control valve 7 and BFG cut-off valve 6; BFG filter screen 5 has two, is connected in parallel on BFG steam line, and only opens a BFG filter screen 5 when work, and such setting can realize not shutting down BFG filter screen 5 is cleaned; At the BFG between BFG filter screen 5 and BFG safety check 4, purge on steam line and be provided with heat exchanger 14, in order to promote BFG filter screen 5 for the filtering effect of water, because BFG from compressor out temperature higher, water is unfavorable for the filtration of 5 pairs of water of BFG filter screen while being gaseous state shape.

Workflow of the present utility model is:

Switch to zero attended mode:

1) close COG separating valve 8, stop the 1 conveying coke-stove gas on duty to firing chamber;

2) open BFG suction valve 3,1 conveying blast furnace to firing chamber; Make blast furnace gas enter firing chamber, substitute coke-stove gas on duty and burn;

3) open N ₂seal valve 12, cog joint blast furnace gas on duty remaining in pipeline purges;

4) close N after completing purging ₂seal valve 12, BFG suction valve 3 etc.

Above-described is only preferred implementation of the present utility model, should be understood that for a person skilled in the art, not departing under the prerequisite of the utility model structure, can also make some distortion and improvement, these can not affect effect and practical applicability that the utility model is implemented.

Claims

1. lower calorific value industrial gas gas turbine gas supply system, comprise COG steam line and connected firing chamber, on described COG steam line, be sequentially provided with COG filter screen, COG separating valve, COG flow control valve, it is characterized in that: also comprise that BFG purges steam line and sealing N ₂steam line; BFG purges on steam line and is provided with successively BFG suction valve, BFG safety check and BFG filter screen; Sealing N ₂steam line is provided with N ₂seal valve and N ₂safety check; COG steam line between COG flow control valve and BFG filter screen is provided with BFG cut-off valve, N ₂steam line connects the COG steam line between COG flow control valve and BFG cut-off valve; At the BFG between BFG safety check and BFG filter screen, purge on steam line and be connected with heat exchanger.

2. lower calorific value industrial gas gas turbine gas supply system according to claim 1, is characterized in that: described BFG filter screen is provided with two, is connected in parallel on BFG and purges on steam line.