CN215723302U

CN215723302U - Low-pressure-drop heating furnace system

Info

Publication number: CN215723302U
Application number: CN202121470782.7U
Authority: CN
Inventors: 张宁博; 王扬; 刘毅; 高文涛
Original assignee: Beijing Pioneer Energy Science And Technology Co ltd
Current assignee: Beijing Pioneer Energy Science And Technology Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-02-01
Anticipated expiration: 2031-06-30

Abstract

The utility model discloses a low-pressure-drop heating furnace system, which comprises a combustor, a radiation chamber, a convection chamber, an SCR (selective catalytic reduction) device, a chimney, a preheater, a fan and a sealing baffle plate, wherein the combustor is arranged in the radiation chamber; a convection chamber and a chimney are sequentially arranged above the radiation chamber, and a burner is arranged in the radiation chamber; a sealing baffle is arranged in the chimney, a flue gas loop is connected to the chimney, an outlet and an inlet of the flue gas loop are respectively and correspondingly positioned on the upper side and the lower side of the sealing baffle, a Selective Catalytic Reduction (SCR) device, a preheater and a fan are sequentially connected to a pipeline from the inlet to the outlet of the flue gas loop, and the sealing baffle is arranged in the flue gas loop between the chimney and the SCR device; the preheater is installed on the ground, and the SCR device is installed above the preheater. The utility model can be switched to the natural ventilation state when the SCR fails, and the problem of overlarge ventilation pressure drop caused by the failure is not considered. Secondly, the pressure drop caused by the smoke side under the working condition of natural ventilation can be eliminated, and the nitrogen oxide absorption effect is ensured to be satisfied, so that the detection and maintenance are more convenient.

Description

Low-pressure-drop heating furnace system

Technical Field

The utility model relates to a low-pressure-drop heating furnace system for a heating furnace, in particular to an arrangement type of an SCR device of a low-pressure-drop heating furnace.

Background

The Selective Catalytic Reduction (SCR) technology is a denitration technology which is the most widely applied in the industry at present, and is widely applied in the refining industry. The SCR device is commonly arranged behind a convection chamber of a heating furnace, high-temperature flue gas enters the SCR device after being cooled by the convection chamber, nitrogen oxides in the flue gas react with a catalyst in the SCR device, and then the flue gas is discharged into the atmosphere after being subjected to waste heat recovery by a preheater, so that the aim of reducing the emission of the nitrogen oxides is fulfilled.

In conventional designs, as shown in fig. 1, the SCR unit 4 is generally placed on the top frame of the convection chamber 3, which is very likely to cause insufficient draft of the chimney 5 under natural ventilation conditions, and thus to cause positive pressure in the radiant chamber 2.

In addition, the SCR device is placed 4 on the top of the convection chamber 3, steel structure budget of the convection chamber 3 and the radiation chamber 2 is increased, and daily maintenance of the SCR device is not convenient.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a low-pressure-drop heating furnace system, which can switch to a natural ventilation state when an SCR fails, without considering the problem of an excessive ventilation pressure drop that may be caused thereby. Secondly, the pressure drop caused by the smoke side under the working condition of natural ventilation can be eliminated, the detection and maintenance are more convenient on the premise of ensuring the requirement of the absorption effect of the nitrogen oxide, and the primary investment cost is lower in the earlier stage.

A low-pressure-drop heating furnace system comprises a burner, a radiation chamber, a convection chamber, an SCR device, a chimney, a preheater, a fan and a sealing baffle plate;

a convection chamber and a chimney are sequentially arranged above the radiation chamber, and a burner is arranged in the radiation chamber; a sealing baffle is arranged in the chimney, a flue gas loop is connected to the chimney, an outlet and an inlet of the flue gas loop are respectively and correspondingly positioned on the upper side and the lower side of the sealing baffle, a Selective Catalytic Reduction (SCR) device, a preheater and a fan are sequentially connected to a pipeline from the inlet to the outlet of the flue gas loop, and the sealing baffle is arranged in the flue gas loop between the chimney and the SCR device; the preheater is arranged on the ground, and the SCR device is arranged above the preheater.

Further, when the heating furnace system is in a normal working state, the sealing baffle in the chimney is in a closed state, the sealing baffle in the flue gas loop is in an open state, when the SCR device is in a fault state, the sealing baffle in the chimney is in an open state, and the sealing baffle in the flue gas loop is in a closed state.

Has the advantages that:

1. the SCR device is arranged at the top of the preheater, and the SCR device and the preheater can be switched off when the SCR fails, so that the heating furnace can ventilate naturally, and the normal operation of the whole plant production is not influenced.

2. After the SCR device is removed from the top of the convection chamber, the weight of the SCR device is not born by the convection chamber and the radiation chamber any more, the bearing capacity requirements of the convection chamber and the radiation chamber are reduced, and the steel structure investment of the convection chamber and the radiation chamber can be effectively reduced.

3. According to the utility model, the SCR device is arranged at the top of the preheater, so that the installation height of the SCR device is reduced, the daily inspection and maintenance of the SCR device are more convenient, and the field installation is more convenient.

Drawings

FIG. 1 is a schematic diagram of a conventional furnace system;

FIG. 2 is a schematic diagram of the low pressure drop heating furnace system of the present invention.

Wherein, the device comprises a combustor 1, a radiation chamber 2, a convection chamber 3, an SCR device 4, a chimney 5, a preheater 6, a fan 7, flue gas 8, a sealing baffle 9 and a sealing baffle 10.

Detailed Description

The utility model is described in detail below by way of example with reference to the accompanying drawings.

As shown in fig. 2, the present invention provides a low pressure drop heating furnace system, which comprises a burner 1, a radiation chamber 2, a convection chamber 3, an SCR device 4, a chimney 5, a preheater 6, a fan 7 and

sealing baffles

9 and 10;

a convection chamber 3 and a chimney 5 are sequentially arranged above the radiation chamber 2, and a burner 1 is arranged in the radiation chamber 2; a sealing baffle plate 10 is arranged in the chimney 5, a flue gas loop is connected to the chimney, an outlet and an inlet of the flue gas loop are respectively and correspondingly positioned on the upper side and the lower side of the sealing baffle plate 10, a pipeline from the inlet to the outlet of the flue gas loop is sequentially connected with the SCR device 4, a preheater 6 and a fan 7, and a sealing baffle plate 9 is arranged in the flue gas loop between the chimney 5 and the SCR device 4; the preheater 6 is installed on the ground, and the SCR device 4 is installed above the preheater 6.

The working principle is as follows: when the heating furnace system is in a normal working state, the sealing baffle 10 in the chimney 5 is in a closed state, the sealing baffle 9 in the smoke loop is in an open state, smoke 8 generated in the radiation chamber 2 enters the chimney 5 through the convection chamber 3, and due to the closing of the sealing baffle 10, the smoke enters the SCR device 4 and the preheater 6 through the smoke loop under the action of negative pressure generated by the suction of the fan 7 and finally returns to the chimney 5 to be discharged outwards. When the SCR device 4 is in a fault state, the sealing baffle in the chimney is in an open state, the sealing baffle in the smoke loop is in a closed state, and the heating furnace system is switched to a natural ventilation state without considering the problem of overlarge ventilation pressure drop possibly caused by the natural ventilation state.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-pressure-drop heating furnace system is characterized by comprising a combustor, a radiation chamber, a convection chamber, an SCR device, a chimney, a preheater, a fan and a sealing baffle plate;

2. The low pressure drop furnace system of claim 1, wherein the sealing damper in the chimney is in a closed state and the sealing damper in the flue gas loop is in an open state during normal operation of the furnace system, and wherein the sealing damper in the chimney is in an open state and the sealing damper in the flue gas loop is in a closed state during a fault state of the SCR device.