A gas boiler hot standby quick start system

Abstract

The application discloses a kind of gas boiler hot standby quick start system, including temperature and pressure reducing system, main regulating system, auxiliary regulating system and superheater regulating system;The output end of temperature and pressure reducing system is respectively connected with main regulating system, auxiliary regulating system and superheater regulating system. Temperature and pressure reducing system is arranged with temperature reducer and pressure reducer, meet the demand of hot standby quick start system steam parameter;Main regulating system sets temperature transmitter two, main regulating valve, can be according to the temperature index of lower header, adjust admission quantity to meet the demand of hot standby;Auxiliary regulating system sets temperature transmitter three, auxiliary regulating valve, can be according to the temperature index of boiler barrel water side, adjust admission quantity, meet the demand of hot standby;Superheater regulating system sets temperature transmitter four, superheater system regulating valve, can be according to the temperature index of superheater, judge whether superheater is waterlogged, protect superheater. Thus reduce enterprise boiler hot standby furnace fuel operating cost, meet emission standard, and can meet hot standby and 5-10 minutes quick start demand.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas-fired boiler for hot standby and quick start requirement, in particular to a gas-fired boiler hot standby quick start system, which is applied to petrochemical, papermaking, pharmaceutical and other industries. BACKGROUND

[0002] In the fields of petrochemical, papermaking, pharmaceutical and the like, continuous supply of steam is required in the process flow, and the steam supply often changes suddenly according to the process requirement. Once the steam supply cannot match the process requirement, the whole process flow will be scrapped or even stopped, which will cause incalculable loss. Nowadays, general enterprises consider setting a hot standby boiler, i.e. when the main boiler is running, the hot standby boiler is running at 3% to 5% BMCR small load, and when the main boiler has an accident, the hot standby boiler is started up quickly to the rated load within 5 to 10 minutes to meet the process requirement. However, the long-term fuel cost consumed by the hot standby condition will cause great burden to the enterprise, and the combustor combustion of the hot standby condition will cause NOx emission to exceed the standard due to high excess air coefficient, insufficient combustion and the like. The above problems have been the problems that need to be solved in this field. SUMMARY

[0003] To solve the above technical problems, the present application designs a gas-fired boiler hot standby quick start system, which can reduce the fuel operation cost of the enterprise boiler hot standby boiler, meet the national standard for boiler emission, and meet the hot standby and 5 to 10 minutes quick start requirement.

[0004] The present application adopts the following technical scheme:

[0005] A gas-fired boiler hot standby quick start system, comprising a temperature and pressure reducing system, a main regulating system, an auxiliary regulating system and a superheater regulating system; the output ends of the temperature and pressure reducing system are communicated with the main regulating system, the auxiliary regulating system and the superheater regulating system respectively;

[0006] The temperature and pressure reducing system comprises a shut-off valve one, a desuperheater, a pressure reducer, a temperature transmitter one and a pressure transmitter which are communicated in sequence through pipelines, and the temperature transmitter one and the pressure transmitter are respectively used for linkage control of the desuperheater and the pressure reducer, and the temperature and pressure reducing system adjusts the steam pressure and temperature at the outlet of the temperature and pressure reducing system through the pressure transmitter and the temperature transmitter one respectively;

[0007] The main regulating system comprises a main regulating valve, a shut-off valve two and a lower header which are communicated in sequence through pipelines, and the lower header is provided with a temperature transmitter two, and the temperature transmitter two is used for linkage control of the main regulating valve, and the main regulating system controls the steam amount entering the lower header by feedback control of the opening degree of the main regulating valve through the temperature transmitter two;

[0008] The auxiliary adjusting system comprises an auxiliary adjusting valve, a shut-off valve three and a drum connected in sequence through pipelines, and a temperature transmitter three is installed on the drum and used for linkage control of the auxiliary adjusting valve, and the auxiliary adjusting system controls the steam quantity entering the drum through feedback control of the auxiliary adjusting valve opening degree by the temperature transmitter three;

[0009] The superheater adjusting system comprises a superheater system adjusting valve, a shut-off valve four and a superheater connected in sequence through pipelines, and a temperature transmitter four is installed on the superheater and used for linkage control of the superheater system adjusting valve, and the superheater adjusting system controls the steam quantity entering the superheater through feedback of the temperature transmitter four to judge whether the superheater is water-logged and control the superheater system adjusting valve opening degree, thereby protecting the superheater;

[0010] The lower header is connected with the drum through pipelines, and the drum is connected with the superheater through pipelines.

[0011] Preferably, a drum pressure indicator is installed on the drum.

[0012] Preferably, a shut-off valve two is installed on each side of the main adjusting valve, and a bypass pipeline one is connected in parallel on both sides of the pipelines connecting the main adjusting valve and the two shut-off valves two, and the two shut-off valves two are installed on the bypass pipeline one.

[0013] Preferably, a shut-off valve three is installed on each side of the auxiliary adjusting valve, and a bypass pipeline two is connected in parallel on both sides of the pipelines connecting the auxiliary adjusting valve and the two shut-off valves three, and the two shut-off valves three are installed on the bypass pipeline two.

[0014] Preferably, a shut-off valve four is installed on each side of the superheater system adjusting valve, and a bypass pipeline three is connected in parallel on both sides of the pipelines connecting the superheater system adjusting valve and the two shut-off valves four, and the two shut-off valves four are installed on the bypass pipeline three.

[0015] The present application has the following advantages: (1) the present application can dynamically select different process schemes according to the steam use condition of an enterprise; (2) the desuperheater and the pressure reducer are arranged in the desuperheating and pressure reducing system to meet the demand of the steam parameters of the hot standby quick start system; (3) the temperature transmitter two and the main adjusting valve are arranged in the main adjusting system, and the steam quantity can be adjusted to meet the demand of the hot standby according to the temperature index of the lower header; (4) the temperature transmitter three and the auxiliary adjusting valve are arranged in the auxiliary adjusting system, and the steam quantity can be adjusted to meet the demand of the hot standby according to the temperature index of the drum water side; (5) the temperature transmitter four and the superheater system adjusting valve are arranged in the superheater adjusting system, and whether the superheater is water-logged can be judged according to the temperature index of the superheater to protect the superheater; (6) the desuperheating and pressure reducing system, the main adjusting system, the auxiliary adjusting system and the superheater adjusting system are all provided with shut-off valves for shut-off, bypass and equipment maintenance, thereby further ensuring the stability of the hot standby quick start system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1This is a schematic diagram of the structure of the present invention;

[0017] In the diagram: 100, Desuperheating and pressure reducing system; 200, Main regulating system; 300, Auxiliary regulating system; 400, Superheater regulating system; 500, Boiler drum pressure indicator; 101, Desuperheater; 102, Pressure reducer; 103, Shut-off valve one; 104, Pressure transmitter; 105, Temperature transmitter one; 201, Main regulating valve; 202, Lower header; 203, Temperature transmitter two; 204, Shut-off valve two; 301, Auxiliary regulating valve; 302, Boiler drum; 303, Temperature transmitter three; 304, Shut-off valve three; 401, Superheating system regulating valve; 402, Superheater; 403, Temperature transmitter four; 404, Shut-off valve four. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0019] Example: Figure 1 As shown, a gas-fired boiler hot standby quick start system includes a desuperheating and pressure reducing system 100, a main regulating system 200, an auxiliary regulating system 300, and a superheater regulating system 400; the output terminal of the desuperheating and pressure reducing system 100 is connected to the main regulating system 200, the auxiliary regulating system 300, and the superheater regulating system 400 respectively.

[0020] The desuperheating and pressure reducing system 100 includes a shut-off valve 103, a desuperheater 101, a pressure reducer 102, a temperature transmitter 105, and a pressure transmitter 104 connected in sequence through pipelines. The temperature transmitter 105 and the pressure transmitter 104 are used to control the desuperheater 101 and the pressure reducer 102 in a linkage manner. The desuperheating and pressure reducing system 100 adjusts the steam pressure and temperature at the outlet of the desuperheating and pressure reducing system 100 through the pressure transmitter 104 and the temperature transmitter 105, respectively.

[0021] The main control system 200 includes a main control valve 201, a second shut-off valve 204, and a lower header 202 connected in sequence by pipelines. A second temperature transmitter 203 is installed on the lower header 202. The second temperature transmitter 203 is used to control the main control valve 201 in conjunction with the main control system 200. The main control system 200 controls the amount of steam entering the lower header 202 by controlling the opening degree of the main control valve 201 through the feedback control of the second temperature transmitter 203.

[0022] The auxiliary control system 300 includes an auxiliary control valve 301, a shut-off valve 304, and a boiler drum 302 connected in sequence by pipelines. A temperature transmitter 303 is installed on the boiler drum 302. The temperature transmitter 303 is used to control the auxiliary control valve 301 in a linkage manner. The auxiliary control system 300 controls the amount of steam entering the boiler drum 302 by controlling the opening degree of the auxiliary control valve 301 through the feedback control of the temperature transmitter 303.

[0023] The superheater adjustment system 400 comprises a superheater system adjustment valve 401, a shut-off valve four 404 and a superheater 402 connected in sequence by pipelines. The superheater 402 is provided with a temperature transmitter four 403 for linkage control of the superheater system adjustment valve 401. The superheater adjustment system 400 judges whether the superheater 402 is waterlogged through feedback of the temperature transmitter four 403, controls the opening of the superheater system adjustment valve 401 to control the amount of steam entering the superheater 402, and protects the superheater 402.

[0024] The lower header 202 is connected to the drum 302 by a pipeline, and the drum 302 is connected to the superheater 402 by a pipeline.

[0025] The drum 302 is provided with a drum pressure indicator 500.

[0026] The main adjustment valve is provided with a shut-off valve two on each side. The pipelines connecting the main adjustment valve and the two shut-off valves two are connected in parallel by a bypass pipeline one, and the bypass pipeline one is provided with the two shut-off valves two.

[0027] The auxiliary adjustment valve is provided with a shut-off valve three on each side. The pipelines connecting the auxiliary adjustment valve and the two shut-off valves three are connected in parallel by a bypass pipeline two, and the bypass pipeline two is provided with the two shut-off valves three.

[0028] The superheater system adjustment valve is provided with a shut-off valve four on each side. The pipelines connecting the superheater system adjustment valve and the two shut-off valves four are connected in parallel by a bypass pipeline three, and the bypass pipeline three is provided with the two shut-off valves four.

[0029] As shown in Figure 1 The low-cost steam is converted into steam with required parameters by the desuperheating and pressure reducing system 100 and then enters the main adjustment system 200, the auxiliary adjustment system 300 and the superheater adjustment system 400 respectively. The desuperheating and pressure reducing system 100 adjusts the steam parameters at the outlet of the desuperheating and pressure reducing system through the pressure transmitter 104 and the temperature transmitter one 105. The steam of the main adjustment system 200 enters the lower header 202 to heat the cold water of the boiler through the main adjustment valve 201. The steam of the auxiliary adjustment system 300 enters the drum 302 to heat the cold water of the boiler through the auxiliary adjustment valve 301. The steam of the superheater adjustment system 400 enters the superheater 402 through the auxiliary superheater system adjustment valve 401.

[0030] In the desuperheating and pressure reducing system 100, the desuperheater 101 adjusts the temperature at the outlet of the desuperheating and pressure reducing system through the temperature transmitter one 105, and the pressure reducer 102 controls the steam pressure at the outlet of the desuperheating and pressure reducing system through the pressure transmitter 104.

[0031] The application mainly satisfies the hot standby condition by controlling the temperature of the temperature transmitter three 303 and the temperature transmitter two 203 to be equal to the saturation temperature corresponding to the set pressure, and then controlling the pressure value of the drum pressure indicator 500 to be equal to the set pressure, thereby preparing for fast start, and setting the superheater adjusting system 400 to judge whether the superheater is water-logged according to the superheater temperature index, and protecting the superheater.

[0032] a. The main adjusting system 200 controls the steam quantity entering the lower header 202 by controlling the opening degree 201 of the main adjusting valve according to the feedback of the temperature transmitter two 203;

[0033] b. The auxiliary adjusting system 300 controls the steam quantity entering the lower drum 302 by controlling the opening degree of the auxiliary adjusting valve 301 according to the feedback of the temperature transmitter three 303;

[0034] c. The superheater adjusting system 400 judges whether the superheater is water-logged according to the feedback of the temperature transmitter four 403, controls the steam quantity entering the superheater 402 by controlling the opening degree of the superheater adjusting valve, and protects the superheater.

[0035] After the gas boiler hot standby fast start system is adopted, the pressure parts such as the lower drum 302 and the lower header 202 are evenly heated in the hot standby condition, the drum pressure indicator 500 maintains the set pressure range, and effective conditions are provided for the fast start of the boiler for 5-10 minutes; during the hot standby process, the burner is not started or the long-lasting fire is started, and the NOx emission meets the standard requirements; at the same time, low-cost steam heating is adopted, which significantly reduces the fuel operation cost.

[0036] According to the enterprise gas consumption, two technical solutions can be selected:

[0037] 1) The enterprise demand is saturated steam:

[0038] The low-cost steam enters the main adjusting system 200 and the auxiliary adjusting system 300 through the desuperheating and pressure reducing system 100 respectively,

[0039] 2) The enterprise demand is superheated steam:

[0040] The low-cost steam enters the main adjusting system 200, the auxiliary adjusting system 300 and the superheated steam adjusting system through the desuperheating and pressure reducing system 100 respectively.

[0041] The above-described embodiments are only a preferred scheme of the application, and do not limit the application in any form, and other variants and modifications can be made without exceeding the technical scheme recited in the claims.

Claims

1. A gas-fired boiler hot standby quick start system characterized by, It includes temperature and pressure reducing system, main regulating system, auxiliary regulating system and superheater regulating system; the output end of the temperature and pressure reducing system is communicated with the main regulating system, the auxiliary regulating system and the superheater regulating system respectively; The temperature and pressure reducing system comprises a shut-off valve I, a desuperheater, a pressure reducer, a temperature transmitter I and a pressure transmitter communicated in sequence through pipelines, the temperature transmitter I and the pressure transmitter are used for linkage control of the desuperheater and the pressure reducer respectively, and the temperature and pressure reducing system adjusts the steam pressure and temperature at the outlet of the temperature and pressure reducing system through the pressure transmitter and the temperature transmitter I respectively; The main regulating system comprises a main regulating valve, a shut-off valve II and a lower header communicated in sequence through pipelines, the lower header is provided with a temperature transmitter II, the temperature transmitter II is used for linkage control of the main regulating valve, and the main regulating system controls the steam quantity entering the lower header by feedback control of the opening degree of the main regulating valve through the temperature transmitter II; The auxiliary regulating system comprises an auxiliary regulating valve, a shut-off valve III and a drum communicated in sequence through pipelines, the drum is provided with a temperature transmitter III, the temperature transmitter III is used for linkage control of the auxiliary regulating valve, and the auxiliary regulating system controls the steam quantity entering the drum by feedback control of the opening degree of the auxiliary regulating valve through the temperature transmitter III; The superheater regulating system comprises a superheater system regulating valve, a shut-off valve IV and a superheater communicated in sequence through pipelines, the superheater is provided with a temperature transmitter IV, the temperature transmitter IV is used for linkage control of the superheater system regulating valve, the superheater regulating system judges whether the superheater is waterlogged by feedback of the temperature transmitter IV, controls the steam quantity entering the superheater by control of the opening degree of the superheater system regulating valve, and protects the superheater; The lower header is communicated with the drum through a pipeline, and the drum is communicated with the superheater through a pipeline.

2. A gas boiler thermal reserve quick start system according to claim 1, characterized in that, The drum is provided with a drum pressure indicator.

3. A gas boiler thermal reserve quick start system according to claim 1, characterized in that, The main regulating valve is provided with the shut-off valve II on both sides respectively, the pipelines connecting the main regulating valve and the two shut-off valves II are provided with a bypass pipeline I in parallel on both sides, and the bypass pipeline I is provided with the two shut-off valves II.

4. A gas boiler thermal reserve quick start system according to claim 1, characterized in that, The auxiliary regulating valve is provided with the shut-off valve III on both sides respectively, the pipelines connecting the auxiliary regulating valve and the two shut-off valves III are provided with a bypass pipeline II in parallel on both sides, and the bypass pipeline II is provided with the two shut-off valves III.

5. A gas boiler thermal reserve quick start system according to claim 1, characterized in that, The superheater system regulating valve is provided with the shut-off valve IV on both sides respectively, the pipelines connecting the superheater system regulating valve and the two shut-off valves IV are provided with a bypass pipeline III in parallel on both sides, and the bypass pipeline III is provided with the two shut-off valves IV.

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