Valve group skid for ammonia gas and natural gas co-combustion low-nitrogen combustor

Abstract

The utility model discloses a valve group skid for an ammonia gas and natural gas co-combustion low-nitrogen combustor, which comprises a skid base for mounting a natural gas sub-skid and an ammonia gas sub-skid, the natural gas sub-skid comprises a natural gas conveying pipeline, and a natural gas source inlet and a main engine natural gas outer ring gas inlet are formed in the two ends of the natural gas conveying pipeline; a manual ball valve I, a filter I, a main gas valve butterfly valve A, a leak detection pressure transmitter I, an automatic relief valve I and a main gas valve butterfly valve B are arranged on the natural gas conveying pipeline, an ignition pipeline is connected to the portion, between the main gas valve butterfly valve A and the main gas valve butterfly valve B, of the natural gas conveying pipeline, and an automatic ignition valve is arranged on the ignition pipeline. The ammonia gas separating pry comprises an ammonia gas conveying pipeline, wherein an ammonia gas source inlet and a host ammonia gas inlet are formed in the two ends of the ammonia gas conveying pipeline, and a manual ball valve II, a filter II, a main gas valve ball valve A, a leak detection pressure transmitter II, an automatic relief valve II and a main gas valve ball valve B are arranged on the ammonia gas conveying pipeline. According to the utility model, on-site assembly is simpler and more convenient, a staged safety test function is realized, and the overall use safety is high.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, and in particular to a valve assembly skid for a low-NOx burner that uses ammonia and natural gas co-firing. Background Technology

[0002] Existing burner ignition systems are complex, requiring a large amount of work for on-site installation, resulting in long construction periods and hindering the overall project progress. The installation of individual components is more prone to errors, making assembly difficult and reinstallation extremely inconvenient. The commissioning costs are also high. Furthermore, the assembled burner ignition system lacks the function of conducting phased safety tests, and its monitoring and protection of gas is not comprehensive enough, thus its overall safety performance needs to be improved. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a valve group skid for a low-NOx burner with ammonia and natural gas co-firing, aiming to solve the technical problems of large workload, long construction period, difficult assembly, high debugging cost, and the need to improve the overall safety performance of the assembled system in the existing technology.

[0004] The technical solution of this utility model is: a valve group skid for a low-NOx burner with ammonia and natural gas co-combustion, including a skid base, on which a natural gas skid and an ammonia skid are installed;

[0005] The natural gas skid includes a natural gas transmission pipeline. One end of the natural gas transmission pipeline is a natural gas source inlet, and the other end is a natural gas outer ring gas inlet for the main unit. From the natural gas source inlet to the natural gas outer ring gas inlet for the main unit, the natural gas transmission pipeline is sequentially equipped with a manual ball valve I, a filter I, a main gas valve butterfly valve A, a leak detection pressure transmitter I, an automatic venting valve I, and a main gas valve butterfly valve B. An ignition pipeline is connected to the natural gas transmission pipeline between the main gas valve butterfly valve A and the main gas valve butterfly valve B, and an automatic ignition valve is provided on the ignition pipeline.

[0006] The ammonia distribution skid includes an ammonia delivery pipeline, with one end of the ammonia delivery pipeline being an ammonia source inlet and the other end being a main unit ammonia inlet. The ammonia delivery pipeline is provided with a manual ball valve II, a filter II, a main gas valve ball valve A, a leak detection pressure transmitter II, an automatic venting valve II, and a main gas valve ball valve B in sequence from the ammonia source inlet to the main unit ammonia inlet.

[0007] Furthermore, the automatic vent valve I described in this utility model has an automatic vent outlet I at its top, and a flame arrester I and a metal expansion joint I are provided on the natural gas transmission pipeline between the main gas valve butterfly valve B and the main unit's natural gas outer ring gas inlet. The flame arrester I and the metal expansion joint I are arranged sequentially from the natural gas source inlet to the main unit's natural gas outer ring gas inlet.

[0008] Furthermore, the ignition pipeline of this utility model has a main unit natural gas center gas inlet, and the automatic ignition valve is provided with a manual ball valve on the ignition pipeline on the side away from the main unit natural gas center gas inlet.

[0009] Furthermore, in this utility model, a manual venting ball valve I, a low-pressure transmitter I, and a pressure gauge I are provided on the natural gas transmission pipeline between the filter I and the main gas valve butterfly valve A. The manual venting ball valve I, the low-pressure transmitter I, and the pressure gauge I are arranged sequentially from the natural gas source inlet to the main unit's natural gas outer ring inlet. The top of the manual venting ball valve I has a manual venting outlet I.

[0010] Furthermore, in this utility model, a purging pipeline I is also connected to the natural gas transmission pipeline between the filter I and the main gas valve butterfly valve A. The purging pipeline I is equipped with a one-way valve I and a nitrogen purging port I. A nitrogen manual ball valve I is provided on the side of the purging pipeline I away from the nitrogen purging port I.

[0011] Furthermore, the automatic venting valve II in this utility model has an automatic venting outlet II at its top end, and a flame arrester II and a metal expansion joint II are provided on the ammonia delivery pipeline between the main gas valve ball valve B and the main ammonia inlet. The flame arrester II and the metal expansion joint II are arranged sequentially from the ammonia source inlet to the main ammonia inlet.

[0012] Furthermore, in this utility model, a manual venting ball valve II, a low-pressure transmitter II, and a pressure gauge II are provided on the ammonia gas delivery pipeline between the filter II and the main gas valve ball valve A. The manual venting ball valve II, the low-pressure transmitter II, and the pressure gauge II are arranged sequentially from the ammonia gas source inlet to the main ammonia gas inlet. The top of the manual venting ball valve II has a manual venting outlet II.

[0013] Furthermore, in this utility model, a purging pipeline II is also connected to the ammonia delivery pipeline between the filter II and the main gas valve ball valve A. The purging pipeline II is equipped with a one-way valve II and has a nitrogen purging port II. A nitrogen manual ball valve II is provided on the side of the purging pipeline II away from the nitrogen purging port II.

[0014] Compared with the prior art, this utility model has the following advantages: It integrates the natural gas and ammonia skids onto the skid base, making on-site assembly simpler and more convenient, eliminating the need for repeated debugging and installation. An automatic vent valve automatically releases gas to the outdoor vent point when a leak occurs, preventing it from flowing into the boiler equipment. Each skid has a phased safety testing function, performing gas leak detection before burner startup to improve safety. During operation, a low-pressure transmitter at the front end measures the gas pressure in the pipeline, stopping the burner when the gas pressure falls below a specified range, automatically controlling combustion to stop. Each skid also has a nitrogen purge port before the valve, allowing nitrogen to purge impurities from the pipeline, improving combustion completeness. A flame arrester is installed at the end of the valve assembly to prevent backfire and explosion. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a perspective view of the natural gas skid described in this utility model;

[0017] Figure 3 This is a front view of the ammonia gas separator skid described in this utility model.

[0018] in:

[0019] 1. Pry bar base;

[0020] 2. Natural Gas Skid; 201. Manual Ball Valve I; 202. Filter I; 203. Manual Venting Ball Valve I; 204. Low Pressure Transmitter I; 205. Pressure Gauge I; 206. Main Gas Butterfly Valve A; 207. Leak Detection Pressure Transmitter I; 208. Automatic Venting Valve I; 209. Main Gas Butterfly Valve B; 210. Flame Arrestor I; 211. Metal Expansion Joint I; 212. Ignition Line Manual Ball Valve; 213. Automatic Ignition Valve; 214. Check Valve I; 215. Nitrogen Manual Ball Valve I;

[0021] 3. Ammonia gas distribution skid; 301. Manual ball valve II; 302. Filter II; 303. Manual venting ball valve II; 304. Low-pressure transmitter II; 305. Pressure gauge II; 306. Main gas valve ball valve A; 307. Leak detection pressure transmitter II; 308. Automatic venting valve II; 309. Main gas valve ball valve B; 310. Flame arrester II; 311. Metal expansion joint II; 312. Check valve II; 313. Nitrogen manual ball valve II;

[0022] L1, Natural gas transmission pipeline; L 11 Purge piping I; L 12Ignition pipeline; A1, Natural gas source inlet; B1, Main unit natural gas outer ring gas inlet; C1, Nitrogen purging port I; D1, Manual vent outlet I; E1, Automatic vent outlet I; F1, Main unit natural gas center gas inlet;

[0023] L2, ammonia gas delivery pipeline; L 21 A1. Purge pipeline II; A2. Ammonia gas source inlet; B2. Main unit ammonia inlet; C2. Nitrogen purge port II; D2. Manual vent outlet II; E2. Automatic vent outlet II. Detailed Implementation

[0024] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0025] Example:

[0026] The accompanying drawings illustrate a specific embodiment of the valve assembly skid block for an ammonia-natural gas mixed combustion low-NOx burner according to this utility model. (Refer to the attached drawings.) Figure 1 It mainly includes a skid base 1, on which a natural gas skid 2 and an ammonia skid 3 are installed.

[0027] Reference Figure 2 The specific structure of the natural gas skid 2 is as follows: the natural gas skid 2 includes a natural gas transmission pipeline L1, one end of which is a natural gas source inlet A1, and the other end is a natural gas outer ring gas inlet B1 for the main unit.

[0028] The natural gas transmission pipeline L1, from the natural gas source inlet A1 to the main unit's natural gas outer ring inlet B1, is sequentially equipped with the following components: manual ball valve I201, filter I202, manual vent ball valve I203, low-pressure transmitter I204, pressure gauge I205, main gas valve butterfly valve A206, leak detection pressure transmitter I207, automatic vent valve I208, main gas valve butterfly valve B209, flame arrester I210, and metal expansion joint I211. The manual vent ball valve I203 has a manual vent outlet IDE1 at its top, and the automatic vent valve I208 has an automatic vent outlet IE1 at its top.

[0029] An ignition line L is connected to the natural gas transmission pipeline L1 between main gas valve butterfly valve A 206 and main gas valve butterfly valve B 209. 12 Ignition line L 12 It is equipped with an automatic ignition valve 213 and an ignition line L. 12 It has a main unit natural gas central gas inlet F1, and an automatic ignition valve 213 on the side of the ignition line L away from the main unit natural gas central gas inlet F1. 12 It is equipped with a manual ball valve 212 for the ignition line.

[0030] A purging line IL is also connected to the natural gas transmission pipeline L1 between filter I202 and main gas valve butterfly valve A206. 11 Purge pipeline IL 11 It is equipped with a one-way valve I214 and a purge line IL. 11 It has a nitrogen purge port ⅠC1 and a one-way valve Ⅰ214 on the side of the purge line ⅠL away from the nitrogen purge port ⅠC1. 11 It is equipped with a nitrogen manual ball valve I215.

[0031] Reference Figure 3 The specific structure of the ammonia gas distribution skid 3 is as follows: the ammonia gas distribution skid 3 includes an ammonia gas delivery pipeline L2, one end of which is the ammonia gas source inlet A2, and the other end is the main unit ammonia gas inlet B2.

[0032] The ammonia gas transmission pipeline L2, from the ammonia gas source inlet A2 to the main unit ammonia gas inlet B2, is sequentially equipped with a manual ball valve II301, a filter II302, a manual vent ball valve II303, a low-pressure transmitter II304, a pressure gauge II305, a main gas valve ball valve A 306, a leak detection pressure transmitter II307, an automatic vent valve II308, a main gas valve ball valve B 309, a flame arrester II310, and a metal expansion joint II311. The manual vent ball valve II303 has a manual vent outlet IID2 at its top, and the automatic vent valve II308 has an automatic vent outlet IIE2 at its top.

[0033] A purging line IIL is also connected to the ammonia delivery pipeline L2 between filter II302 and main gas valve ball valve A306. 21 Purge pipeline IIL 21 It is equipped with a one-way valve II312 and a purge line IIL. 21 The purge line IIL has a nitrogen purge port IIC2 and a one-way valve II312 on the side away from the nitrogen purge port IIC2. 21 It is equipped with a nitrogen manual ball valve II313.

[0034] In operation, the natural gas skid 2 is used as follows: natural gas is introduced from the natural gas source inlet A1, passes through the manual ball valve I201 and filter I202, and reaches the main gas valve butterfly valve A206. When the burner is not started, the main gas valve butterfly valve A206 is closed, the automatic vent valve I208 is open, and the main gas valve butterfly valve B209 is closed. Therefore, if there is a problem with the main gas valve butterfly valve A206, and there is a leak inside the main gas valve butterfly valve A206, but the main gas valve butterfly valve B209 is closed, then the leaked gas will flow out from the automatic vent valve I208 to the outdoor vent point, ensuring that there is no combustible gas inside the boiler equipment before combustion.

[0035] When the burner starts, the leak detection procedure is initiated, and the leak detection pressure transmitter I207 detects the leak. The procedure consists of two stages:

[0036] Phase 1 Test: Close the automatic vent valve I208. At this time, the main gas valve butterfly valve A206, automatic vent valve I208, and main gas valve butterfly valve B209 are all closed. Within 30 seconds, use the leak detection pressure transmitter I207 to detect whether the pressure in the pipeline between main gas valve butterfly valve A206 and main gas valve butterfly valve B209 increases. If there is a pressure response, it indicates that the main gas valve butterfly valve A206 is leaking, and the burner cannot start. If the main gas valve butterfly valve A206 is not leaking, proceed to Phase 2.

[0037] Second stage test: Open the main gas valve butterfly valve A 206 for 3 seconds, then close it, so that the pressure in the pipeline between main gas valve butterfly valve A 206 and main gas valve butterfly valve B 209 equals the natural gas source pressure. Then, use leak detection pressure transmitter I 207 to detect the pressure in the pipeline between main gas valve butterfly valve A 206 and main gas valve butterfly valve B 209. If the pressure cannot be maintained, it indicates that main gas valve butterfly valve B 209 or automatic vent valve I 208 is leaking, and the burner cannot start. If the pressure does not drop within 30 seconds, it indicates that there is no gas leak, and the second stage is passed. If both the first and second stages are passed, the burner startup procedure proceeds to the next stage.

[0038] After the leak test passes, ignition begins. The main gas valve butterfly valve A 206 and the automatic ignition valve 213 open, and gas flows through the ignition line L. 12 The gas is sent to the ignition nozzle and ignited by the ignition spark. After the controller controls the ignition time to expire, the main gas valve butterfly valve B 209 opens. After the main flame is formed, the automatic ignition valve 213 closes, and the flame burns under the ignition load.

[0039] When the burner is shut down, the valves operate as follows: main gas valve butterfly valve A 206 is closed, automatic vent valve I 208 is opened, and main gas valve butterfly valve B 209 is closed, cutting off the combustion flow to the boiler.

[0040] The function of the low-pressure transmitter I204 is to prevent the burner from operating when the gas pressure is lower than a specified range. The low-pressure transmitter I204 measures the natural gas pressure in the pipeline. When the pressure value is lower than the preset value, the burner stops burning, and the valve actions are as follows: the main gas valve butterfly valve A 206 is closed, the automatic vent valve I208 is opened, and the main gas valve butterfly valve B 209 is closed.

[0041] The specific use of the ammonia gas distribution skid 3 is as follows: ammonia gas is introduced from the ammonia gas source inlet A2, passes through the manual ball valve II 301 and the filter II 302, and reaches the main gas valve ball valve A 306. Similarly, when the burner is not started, the main gas valve ball valve A 306 is closed, the automatic vent valve II 308 is open, and the main gas valve ball valve B 309 is closed. Therefore, if there is a problem with the main gas valve ball valve A 306, and there is a leak inside the main gas valve ball valve A 306, but the main gas valve ball valve B 309 is closed, then the leaked gas will flow out from the automatic vent valve II 308 to the outdoor vent point, ensuring that there is no combustible gas inside the boiler equipment before combustion.

[0042] When the burner starts, the leak detection procedure is initiated. The leak detection pressure transmitter II307 detects the leak. The leak detection process of ammonia skid 3 is the same as the detection steps of natural gas skid 2. After both detection stages are passed, the next stage is entered.

[0043] After the natural gas is ignited, the main gas valve ball valve A 306 and the main gas valve ball valve B 309 open, and ammonia flows into the burner to burn together with the natural gas.

[0044] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A valve assembly skid for a low-NOx burner using ammonia-natural gas co-firing, characterized in that: Includes a skid base (1), on which a natural gas skid (2) and an ammonia skid (3) are installed; The natural gas skid (2) includes a natural gas transmission pipeline (L1), one end of which is a natural gas source inlet (A1) and the other end is a main unit natural gas outer ring inlet (B1). The natural gas transmission pipeline (L1) is sequentially equipped with a manual ball valve I (201), a filter I (202), a main gas valve butterfly valve A (206), a leak detection pressure transmitter I (207), an automatic venting valve I (208), and a main gas valve butterfly valve B (209) from the natural gas source inlet (A1) towards the main unit natural gas outer ring inlet (B1). An ignition pipeline (L1) is connected between the main gas valve butterfly valve A (206) and the main gas valve butterfly valve B (209). 12 The ignition line (L) 12 The device is equipped with an automatic ignition valve (213); The ammonia distribution skid (3) includes an ammonia delivery pipeline (L2), one end of which is an ammonia source inlet (A2) and the other end is a main unit ammonia inlet (B2). The ammonia delivery pipeline (L2) is provided with a manual ball valve II (301), a filter II (302), a main gas valve ball valve A (306), a leak detection pressure transmitter II (307), an automatic venting valve II (308), and a main gas valve ball valve B (309) in sequence from the ammonia source inlet (A2) to the main unit ammonia inlet (B2).

2. The valve assembly skid for an ammonia-natural gas co-firing low-NOx burner according to claim 1, characterized in that: The top of the automatic vent valve I (208) has an automatic vent outlet I (E1). The natural gas transmission pipeline (L1) between the main gas valve butterfly valve B (209) and the main unit natural gas outer ring gas inlet (B1) is equipped with a flame arrester I (210) and a metal expansion joint I (211). The flame arrester I (210) and the metal expansion joint I (211) are arranged sequentially from the natural gas source inlet (A1) to the main unit natural gas outer ring gas inlet (B1).

3. The valve assembly skid for an ammonia-natural gas co-firing low-NOx burner according to claim 1, characterized in that: The ignition line (L) 12 The main unit has a central natural gas inlet (F1), and the automatic ignition valve (213) is located on the side of the ignition line (L) away from the central natural gas inlet (F1). 12 The device is equipped with a manual ball valve (212) for the ignition line.

4. The valve assembly skid for an ammonia-natural gas co-firing low-NOx burner according to claim 1, characterized in that: The natural gas transmission pipeline (L1) between the filter I (202) and the main gas valve butterfly valve A (206) is equipped with a manual vent ball valve I (203), a low-pressure transmitter I (204), and a pressure gauge I (205). The manual vent ball valve I (203), the low-pressure transmitter I (204), and the pressure gauge I (205) are arranged sequentially from the natural gas source inlet (A1) to the main gas outer ring inlet (B1). The top of the manual vent ball valve I (203) has a manual vent outlet I (D1).

5. The valve assembly skid for an ammonia-natural gas co-firing low-NOx burner according to claim 1, characterized in that: A purging pipeline I (L1) is also connected to the natural gas transmission pipeline (L1) between the filter I (202) and the main gas valve butterfly valve A (206). 11 The purging pipeline I (L) 11 The device is equipped with a one-way valve I (214) and a purge line I (L) 11 The ) has a nitrogen purge port I (C1), and the one-way valve I (214) is located on the side of the purge line I (L) away from the nitrogen purge port I (C1). 11 The device is equipped with a nitrogen manual ball valve I (215).

6. The valve assembly skid for an ammonia-natural gas co-firing low-NOx burner according to claim 1, characterized in that: The top of the automatic vent valve II (308) has an automatic vent outlet II (E2). The ammonia delivery pipeline (L2) between the main gas valve ball valve B (309) and the main ammonia inlet (B2) is equipped with a flame arrester II (310) and a metal expansion joint II (311). The flame arrester II (310) and the metal expansion joint II (311) are arranged sequentially from the ammonia source inlet (A2) to the main ammonia inlet (B2).

7. The valve assembly skid for an ammonia-natural gas co-firing low-NOx burner according to claim 1, characterized in that: The ammonia delivery pipeline (L2) between the filter II (302) and the main gas valve ball valve A (306) is equipped with a manual vent ball valve II (303), a low-pressure transmitter II (304), and a pressure gauge II (305). The manual vent ball valve II (303), the low-pressure transmitter II (304), and the pressure gauge II (305) are arranged sequentially from the ammonia source inlet (A2) to the main ammonia inlet (B2). The top of the manual vent ball valve II (303) has a manual vent outlet II (D2).

8. The valve assembly skid for an ammonia-natural gas co-firing low-NOx burner according to claim 1, characterized in that: A purging pipeline II (L) is also connected to the ammonia delivery pipeline (L2) between the filter II (302) and the main gas valve ball valve A (306). 21 The purging pipeline II (L) 21 The device is equipped with a one-way valve II (312) and a purge line II (L). 21 The ) has a nitrogen purge port II (C2), and the one-way valve II (312) is located on the side of the purge line II (L) away from the nitrogen purge port II (C2). 21 The device is equipped with a nitrogen manual ball valve II (313).

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