L-shaped gas boiler

Abstract

The utility model discloses an L-shaped gas-fired boiler, which comprises a boiler barrel, a burner, a hearth and a chimney, the hearth is transversely and horizontally arranged, the tail part of the hearth is connected with a tail vertical shaft, the chimney is vertically arranged and connected to the tail vertical shaft, a hearth built-in heating surface is transversely and horizontally arranged in the hearth, a tail vertical shaft built-in heating surface is vertically arranged in the tail vertical shaft, and the tail vertical shaft built-in heating surface is arranged in the tail vertical shaft. And the hearth, the tail vertical shaft, the hearth built-in heating surface and the tail vertical shaft built-in heating surface enable the boiler to form a primary-secondary L-shaped arrangement. According to the utility model, the field occupancy rate can be reduced as much as possible, the installation period can be shortened as much as possible, continuous steam supply can be realized, and the ultra-low emission requirement can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of gas boilers, in particular to an L-shaped gas boiler, which is applied to industries such as petrochemical, papermaking, and pharmaceutical Background Technique

[0002] At present, in the fields of petrochemical, papermaking, pharmaceutical, etc., several common problems often occur in the application of gas boilers: ① In the process flow, continuous steam supply is required, and at the same time, the steam supply often changes suddenly according to the process requirements. Once the steam supply cannot match the process requirements, there will be a risk of scrapping or even stopping the entire process flow. There is an urgent need for a boiler with heat reserve and quick start functions; ② The site available for the boiler is small, and how to design the boiler to meet the site requirements; ③ Generally, the installation period of the boiler is relatively tight, and how to shorten the boiler installation period; ④ How to meet the ultra-low emission requirements.

[0003] In order to solve the above several problems, it is urgent to develop a new type of gas boiler with reasonable structure, stability and reliability. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model designs an L-shaped gas boiler, which can minimize the site occupancy rate, shorten the installation period as much as possible, and at the same time can realize continuous steam supply and meet the requirements of ultra-low emissions.

[0005] The utility model adopts the following technical solutions:

[0006] An L-shaped gas boiler includes a drum, a burner, a furnace and a chimney. The furnace is horizontally arranged transversely, and a tail shaft is connected to the tail of the furnace. The chimney is vertically arranged and connected to the tail shaft. Horizontally and horizontally in the furnace there is an in-furnace heating surface, and vertically arranged in the tail shaft there is an in-tail-shaft heating surface. The furnace, the tail shaft, the in-furnace heating surface and the in-tail-shaft heating surface form a mother-child "L" shape layout for the boiler.

[0007] Preferably, the in-furnace heating surface includes multiple groups of evaporators and superheaters, and a desuperheater is installed between multiple groups of superheaters.

[0008] Preferably, the in-tail-shaft heating surface includes a superheater, an economizer, a low-pressure economizer and an air preheater, and the superheater, the economizer, the low-pressure economizer and the air preheater are arranged in sequence from bottom to top.

[0009] Preferably, an SCR denitration device is arranged at the lower part of the superheater.

[0010] Preferably, the burner is horizontally arranged on the front side of the furnace, and the volume design in the furnace meets the requirements of the flame diameter and length sprayed by the burner.

[0011] Preferably, water-cooled walls are arranged on the inner wall of the furnace.

[0012] Preferably, the diameter of the drum ≥ 2m.

[0013] The beneficial effects of the present utility model are as follows: (1) The present utility model adopts a large drum design, resulting in safe water circulation and meeting the water circulation requirements even under ultra-low load conditions, thus meeting the requirements of heat reserve and quick start; (2) The furnace adopts a large furnace design, effectively reducing the volumetric heat load of the furnace and reducing NOx emissions; (3) Dynamically adjust the heating surfaces inside the furnace and the heating surfaces in the tail shaft. The chimney is placed above the heating surfaces in the tail shaft to meet the requirements of the occupied area of the boiler site; (4) The heating surfaces inside the tail shaft are all designed in modular form and shipped as a whole, reducing the on-site installation workload and shortening the installation cycle. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] In the figure: 000, drum; 100, burner; 200, furnace; 300, heating surfaces inside the furnace; 301, superheater; 302, evaporator; 400, heating surfaces inside the tail shaft; 401, economizer; 402, low-pressure economizer; 403, air preheater; 500, desuperheater; 600, SCR denitration device; 700, chimney. Detailed Embodiments

[0016] The technical solutions of the present utility model will be further specifically described below through specific embodiments in conjunction with the drawings:

[0017] Embodiment: As Figure 1 shown, an L-shaped gas boiler includes a drum 000, a burner 100, a furnace 200, heating surfaces 300 inside the furnace, a tail shaft, heating surfaces 400 inside the tail shaft, a desuperheater 500, an SCR denitration device 600, and a chimney 700. The furnace is mainly composed of water-cooled walls. The heating surfaces 300 inside the furnace include an evaporator 301 and a superheater 302. The heating surfaces 400 inside the tail shaft include a superheater 302, an economizer 401, a low-pressure economizer 402, and an air preheater 403. Among them, the furnace, the tail shaft, the heating surfaces inside the furnace, and the heating surfaces inside the tail shaft form a mother-child "L" shape layout for the boiler.

[0018] The drum 000 adopts a large drum design with an inner diameter ≥ 2m, providing a larger water volume to ensure stable water level and reliable water circulation under extreme operating conditions, and meeting the water circulation requirements even under ultra-low load conditions. Furthermore, it realizes the heat reserve of the boiler at 5% - 10% ultra-low load. When the main equipment suddenly breaks down, this L-shaped gas boiler can be used as a heat standby furnace to quickly start to the rated load requirement within 5 - 10 minutes.

[0019] The furnace 200 adopts a large-volume design to meet the requirements of the flame diameter and length, and can effectively reduce the volumetric heat load of the furnace, thereby reducing NOx emissions.

[0020] This L-type gas boiler can dynamically adjust the in-furnace heating surface and the heating surface in the tail shaft according to the actual boiler use site conditions, the actual needs of users, and the balance of the total boiler cost. At the same time, the chimney is placed above the tail heating surface to meet the special needs of customers for site use. If the customer requires saturated steam parameters, the superheater 302 can be omitted, and at the same time, the evaporator layout in the in-furnace heating surface 300 can be reduced, and the layout of the heating surface 400 in the tail shaft can be increased, which can greatly reduce the total length of the boiler.

[0021] If the customer requires slightly superheated steam parameters, the superheater layout in the in-furnace heating surface 300 can be omitted, and only the superheater layout in the heating surface 400 in the tail shaft is retained.

[0022] If the customer requires high superheated steam parameters, under the premise of meeting the site occupancy situation, as many superheaters as possible can be arranged in the in-furnace heating surface to provide high temperature and pressure, and reduce the boiler material cost.

[0023] If the customer has high requirements for boiler efficiency, then a low-pressure economizer 402 and an air preheater 403 can be considered to be arranged in the heating surface 400 in the tail shaft of the boiler, further reducing the flue gas discharge temperature and improving the boiler thermal efficiency compared with the situation of only arranging the economizer 401.

[0024] If the customer has high requirements for NOx emissions, then the SCR denitration device 600 or its spare space can be negotiated and arranged with the customer to cope with the risk of increased NOx emissions that may be caused by the current or subsequent fuel change.

[0025] The heating surface 400 in the tail shaft and the chimney are both designed and manufactured modularly, and the modules are shipped from the factory, reducing the on-site installation workload, further ensuring product quality, and shortening the installation cycle.

[0026] The main working process of this L-type gas boiler is divided into the flue gas side and the working medium side. The specific process is as follows:

[0027] 1) Flue gas side: The fuel and air are pre-mixed and burned by the burner, and then pass through the furnace, the in-furnace heating surface, the SCR denitration device, the heating surface in the tail shaft, and the chimney in sequence and are discharged into the atmosphere.

[0028] 2) Working medium side: The demineralized water is heated by the economizer and then enters the drum. The working medium is heated by the furnace water wall to generate saturated steam, and the saturated steam further enters the superheater for heating, and finally generates steam with parameters meeting the user's requirements.

[0029] The above-described embodiments are only a preferred solution of the present utility model, and do not impose any formal restrictions on the present utility model. There are other variants and modifications without exceeding the technical solutions described in the claims.

Claims

1. An L-shaped gas boiler, comprising a drum, a burner, a furnace and a chimney, characterized in that, The furnace is arranged horizontally in the transverse direction. The tail shaft is connected to the tail of the furnace. The chimney is arranged vertically and connected to the tail shaft. Horizontally and inside the furnace, there is an in-furnace heating surface. Vertically arranged in the tail shaft is an in-tail-shaft heating surface. The furnace, the tail shaft, the in-furnace heating surface, and the in-tail-shaft heating surface form a mother-child "L" type layout for the boiler.

2. The L-shaped gas boiler according to claim 1, characterized in that, The in-furnace heating surface includes multiple groups of evaporators and superheaters. A desuperheater is installed between multiple groups of superheaters.

3. The L-shaped gas boiler according to claim 1, characterized in that, The in-tail-shaft heating surface includes a superheater, an economizer, a low-pressure economizer, and an air preheater. The superheater, the economizer, the low-pressure economizer, and the air preheater are arranged in sequence from bottom to top.

4. The L-shaped gas boiler according to claim 3, characterized in that, An SCR denitration device is arranged below the superheater.

5. A type-L gas boiler according to claim 1, characterized in that, The burners are arranged horizontally on the front side of the furnace. The internal volume design of the furnace meets the requirements of the flame diameter and length ejected by the burners.

6. A type-L gas boiler according to claim 1, characterized in that, Water walls are arranged on the inner wall of the furnace.

7. The L-shaped gas boiler according to claim 1, characterized in that, The diameter of the steam drum is ≥ 2 m.

Images