Silver-method formaldehyde and organic waste gas incineration and waste heat recovery device

Abstract

The utility model discloses a silver-method formaldehyde and organic waste gas incineration and waste heat recovery device, which relates to the technical field of environmental protection and comprises a first incinerator, a second incinerator, an induced draft fan and a waste heat recovery system. The waste heat recovery system is arranged at the rear end of the first incinerator, and the induced draft fan is arranged at the rear end of the waste heat recovery system. Formaldehyde tail gas is used as fuel to incinerate organic waste gas, such as urea resin waste gas, workshop low-concentration waste gas, glyoxal waste gas, Cwaste gas and the like; waste gas resources generated in the production process are fully utilized, the cost expenditure for additionally purchasing other fuels is avoided, effective recycling of the resources is achieved, the production cost is reduced, and the waste heat steam boiler can recycle most heat and generate steam which can be further used for other industrial production links or heat supply and the like. The energy saver is used for heating boiler feed water, and the energy utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to environmental protection technical field especially relates to a silver formaldehyde and organic waste gas incineration and waste heat recovery device. BACKGROUND

[0002] Formaldehyde production process is generally silver catalytic oxidation method, this method is under the condition of methanol excess, under the condition of normal pressure 600-680 DEG C, through silver catalytic oxidation reaction, the raw material gas of ternary gas (methanol, air, water vapor) is converted into formaldehyde gas, using the characteristic that formaldehyde is dissolved in water, through cooling, condensation, absorption process, formaldehyde gas is changed into solution, control water amount and obtain industrial formaldehyde product containing certain formaldehyde content.

[0003] Formaldehyde has extensive use, the related product involved in this process is glyoxal, urea formaldehyde resin, C5 product.These products in the production, storage, transport process will produce VOC gas, have different characteristics.Glyoxal production exhaust has certain corrosivity;C5 exhaust is C5 tank in the filling process leak gas, in the filling process, use N2 as environmental protection gas, therefore C5 exhaust has the characteristics of flammable and explosive;Urea formaldehyde adhesive exhaust and workshop low concentration exhaust after washing tower, have certain peculiar smell but not flammable. INVENTION CONTENTS

[0004] In order to realize above-mentioned purpose, the utility model provides following technical scheme: the purpose of the utility model is to the exhaust gas of silver formaldehyde production and downstream product, adopts direct combustion method to process it, and recovers heat and produces steam;A silver formaldehyde and organic waste gas incineration and waste heat recovery device, wherein, including being provided with a No.

[0005] No. One incinerator takes formaldehyde tail gas as main fuel, urea formaldehyde resin exhaust and workshop low concentration exhaust as part of combustion air, and 80% of the flow of 600Nm³ / h glyoxal exhaust is introduced into No.

[0006] No. Two incinerator takes formaldehyde tail gas as long-lasting fire, and C5 exhaust is pressurized to combustor two combustion through Roots blower, and part of glyoxal exhaust is incinerated simultaneously.

[0007] The waste heat recovery system is composed of waste heat steam boiler, economizer, formaldehyde tail gas preheater and air preheater, and the rear end of the air preheater is provided with an induced draft fan.

[0008] Preferably, the C5 is combusted by being injected into the furnace after being pressurized;

[0009] Preferably, the aldehyde resin waste gas and the low-concentration waste gas from the workshop are introduced into the burner one by means of a blower.

[0010] Preferably, the glyoxal waste gas is directly introduced into the high-temperature flue gas for incineration.

[0011] Preferably, the waste heat steam boiler, the economizer, the air preheater, and the formaldehyde tail gas preheater are connected by pipelines.

[0012] Preferably, flow meters are arranged on the input pipelines of the first incinerator and the second incinerator through which the formaldehyde tail gas enters, respectively; flow meters are arranged on the pipelines through which the C5 waste gas is introduced into the second incinerator after being pressurized by a Roots blower; flow meters are arranged on the pipelines through which the glyoxal waste gas is introduced into the first incinerator and the second incinerator, respectively; flow meters are arranged on the pipelines through which the urea-formaldehyde resin waste gas and the low-concentration waste gas from the workshop enter the first incinerator as combustion-supporting air; and flow meters are arranged on the outlet pipelines of the first incinerator and the second incinerator.

[0013] Preferably, pressure sensors are arranged at the inlet and outlet of the Roots blower of the C5 waste gas; pressure sensors are arranged on the input pipelines of the first incinerator and the second incinerator through which the formaldehyde tail gas enters, respectively; pressure sensors are arranged on the pipelines through which the glyoxal waste gas is introduced into the first incinerator and the second incinerator, respectively; and pressure sensors are arranged on the pipelines through which the urea-formaldehyde resin waste gas and the low-concentration waste gas from the workshop enter the first incinerator as combustion-supporting air.

[0014] Preferably, a corrosion-resistant flow guide device is arranged at the position where the glyoxal waste gas is introduced into the high-temperature flue gas.

[0015] Preferably, water seal tanks are arranged on the pipelines through which the formaldehyde enters the first incinerator, on the pipelines through which the glyoxal waste gas enters the second incinerator, and on the exhaust pipeline of the C5 waste gas.

[0016] Beneficial effects: compared with the prior art, the utility model relates to environmental protection technical field, the formaldehyde waste gas and other organic waste gas generated in formaldehyde industry are incinerated, and the heat is recycled, the process is composed of waste gas incineration system and waste heat recovery system, waste gas incineration system realizes the safe combustion of waste gas, and waste heat recovery system recovers heat to produce steam, the waste gas incineration system is composed of water seal tank, combustor, incinerator and gas pipeline, the water seal tank has the effect of anti-backfire and gas collection and distribution, and is divided into formaldehyde tail gas water seal tank, C5 waste gas water seal tank and glyoxal waste gas water seal tank according to waste gas characteristics.No.1 incinerator uses formaldehyde tail gas as fuel, and the low-concentration waste gas in the workshop is used as part of the combustion air, which is fully combusted in the incinerator, and the temperature can reach above 1000 DEG C and stays for about 3S;No.2 incinerator uses formaldehyde tail gas as a permanent fire, and C5 waste gas is introduced into the combustor for combustion.Glyoxal waste gas has low concentration and certain corrosiveness, which is introduced into the incinerator through the pipeline for high-temperature incineration.The waste heat recovery system is composed of waste heat steam boiler, economizer, tail gas preheater and air preheater.The waste heat steam boiler recovers most of the heat to produce steam;the tail gas preheater and air preheater aim to recover heat while increasing the heat in the incinerator to ensure the temperature requirement of waste gas incineration;the economizer is used to heat the boiler feed water.The induced draft fan is arranged at the tail of the waste heat recovery system to introduce the flue gas into the chimney to ensure that the incinerator is in a slightly negative pressure state;as described above, the utility model uses formaldehyde tail gas as fuel to incinerate organic waste gas such as urea-formaldehyde resin waste gas, low-concentration waste gas in the workshop, glyoxal waste gas and C5 waste gas, fully utilizes the waste gas resources generated in the production process, avoids the cost of additional procurement of other fuels, realizes the effective reuse of resources, reduces the production cost, and the waste heat recovery system is composed of waste heat steam boiler, economizer, formaldehyde tail gas preheater and air preheater.The waste heat steam boiler can recover most of the heat and produce steam, which can be further used in other industrial production links or heating purposes;the economizer is used to heat the boiler feed water, improving the energy utilization efficiency;the formaldehyde tail gas preheater and air preheater not only recover heat, but also increase the heat in the incinerator to ensure the temperature requirement of waste gas incineration, forming a relatively perfect waste heat recovery and utilization system, further saving energy. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0018] The technical scheme of the patent will be further described in detail in combination with specific implementation manners.

[0019] EMBODIMENT

[0020] Please refer to the drawings, the utility model discloses a formaldehyde and organic waste gas incineration and waste heat recovery device, wherein, including being provided with a No. one incinerator, No. two incinerator, induced draft fan and waste heat recovery system, the waste heat recovery system is arranged at the rear end of the No. one incinerator, and the induced draft fan is arranged at the rear end of the waste heat recovery system,

[0021] The No. one incinerator uses formaldehyde tail gas as main fuel, uses urea formaldehyde resin waste gas and workshop low-concentration waste gas as part of combustion air, and introduces 80% of 600Nm³ / h of glyoxal waste gas into the No. one incinerator for incineration for more than 3 seconds.

[0022] The No. two incinerator uses formaldehyde tail gas as long-lasting fire, and C5 waste gas is pressurized to the burner two by the Roots blower and is incinerated with part of glyoxal waste gas at the same time.

[0023] The waste heat recovery system is composed of waste heat steam boiler, economizer, formaldehyde tail gas preheater and air preheater, after the waste heat steam boiler, economizer, air preheater and formaldehyde tail gas preheater absorb heat, the treated gas is introduced to the chimney by the induced draft fan, the waste heat steam boiler recovers most of the heat to generate steam, the formaldehyde tail gas preheater and the air preheater are used to recover heat and increase the heat in the incinerator, so as to ensure the temperature requirement of waste gas incineration, the economizer is used to heat the boiler feed water, the induced draft fan arranged at the tail of the waste heat recovery system introduces the flue gas to the chimney, so as to ensure that the incinerator is in a slightly negative pressure state, the waste heat steam boiler is composed of a boiler body and an economizer condenser, the boiler body adopts a double drum structure, which is stable and mature, and is composed of upper and lower drums, membrane walls and convection tube bundles, the economizer is composed of an inlet water header, a serpentine finned tube heating surface and an outlet water header.

[0024] Further, the whole process uses formaldehyde tail gas as fuel to incinerate organic waste gas, without the need to add other fuels.

[0025] Further, the C5 waste gas is flammable and explosive, and is combusted by being injected into the furnace after being pressurized, so as to prevent flameout and deflagration.

[0026] Further, the urea formaldehyde resin waste gas and the workshop low-concentration waste gas need to be introduced to the burner one by the air blower as combustion air.

[0027] Further, the glyoxal waste gas has certain corrosiveness and is directly introduced into high-temperature flue gas for incineration.

[0028] Further, the air preheater and the formaldehyde tail gas preheater are used to absorb flue gas heat, increase the heat into the furnace, increase the furnace temperature, and ensure the temperature requirement of direct waste gas combustion treatment.

[0029] Further, the waste heat steam boiler, economizer, air preheater, formaldehyde tail gas preheater are connected by pipeline.

[0030] Further, the flow meters are arranged on the input pipelines of the formaldehyde tail gas into the first incinerator and the second incinerator, the flow meter is arranged on the pipeline through which the C5 waste gas is led to the second incinerator burner two after being pressurized by the Roots blower, the flow meters are arranged on the pipelines through which the glyoxal waste gas is respectively led into the first incinerator and the second incinerator, the flow meter is arranged on the pipeline through which the urea-formaldehyde resin waste gas and the low-concentration waste gas from the workshop are led into the first incinerator as combustion-supporting air, and the flow meters are arranged on the outlet pipelines of the first incinerator and the second incinerator to monitor the flow of the waste gas after incineration.

[0031] Further, the pressure sensors are arranged at the inlet and outlet of the Roots blower of the C5 waste gas to monitor the pressurization of the C5 waste gas and prevent safety accidents caused by abnormal pressure, the pressure sensors are arranged on the input pipelines of the formaldehyde tail gas into the first incinerator and the second incinerator to monitor the pressure and ensure that the flow and pressure of the formaldehyde tail gas entering the incinerator meet the process requirements and the stability of combustion is ensured, the pressure sensors are arranged on the pipelines through which the glyoxal waste gas is respectively led into the first incinerator and the second incinerator to monitor the pressure in the pipelines and ensure that the glyoxal waste gas can enter the corresponding incinerator for effective incineration under the specified flow and pressure conditions, and the pressure sensors are arranged on the pipeline through which the urea-formaldehyde resin waste gas and the low-concentration waste gas from the workshop are led into the first incinerator as combustion-supporting air to monitor the pressure in the pipeline, so that the supply of combustion-supporting air can be reasonably controlled to achieve good combustion effect together with the main fuel.

[0032] Further, the corrosion-resistant flow guide device is arranged at the position where the glyoxal waste gas is introduced into the high-temperature flue gas to ensure that the glyoxal waste gas can uniformly enter the high-temperature flue gas for incineration.

[0033] Further, the water seal tank is arranged on the pipeline through which the formaldehyde is led into the first incinerator, the water seal tank is also arranged on the pipeline through which the glyoxal waste gas is led into the second incinerator, and the water seal tank is also arranged on the exhaust pipeline of the C5 waste gas, the water seal tank plays a crucial role in preventing backfire, when the flame enters the water seal tank through the exhaust gas outlet, since the inlet pipeline is below the water surface, the water seal tank can prevent the spread of the flame and protect the pipelines and devices above; eliminate pressure fluctuations in the pipeline system; collect liquid droplets in the gas phase, the water seal tank can absorb liquid droplets, and a gas-liquid separator is arranged at the outlet to prevent liquid droplets from entering the subsequent equipment.

[0034] Working principle: No. 1 incinerator takes formaldehyde tail gas as main fuel, urea-formaldehyde glue waste gas and workshop low concentration waste gas as part of combustion air, and 80% of glyoxal waste gas is introduced into negative pressure incinerator for incineration for more than 3S, and the temperature can reach more than 1000℃; No. 2 incinerator takes formaldehyde tail gas as eternal fire, C5 waste gas is pressurized to combustor by Roots blower for combustion, and part of glyoxal waste gas is incinerated at the same time; The setting of water seal tank is to prevent backfire caused by furnace explosion and ensure the safety of front-end production process. The main purpose of the setting of air preheater and formaldehyde tail gas preheater is to improve the temperature of formaldehyde tail gas and air, improve the heat into the furnace and stabilize the combustion. The calorific value of formaldehyde tail gas is 540KJ / Nm3, the combustion temperature is low, the temperature in the incinerator can be increased to more than 900℃ by increasing the temperature of formaldehyde tail gas and air, and high temperature can realize the harmless treatment of waste gas.

[0035] The utility model relates to environmental protection technical field, and the formaldehyde waste gas and other organic waste gas generated in formaldehyde industry are incinerated, and the heat is recycled, and the process is composed of waste gas incineration system and waste heat recovery system, and the waste gas incineration system realizes the safe combustion of waste gas, and the waste heat recovery system recovers heat to produce steam, and the waste gas incineration system is composed of water seal tank, combustor, incinerator and gas pipeline, the water seal tank has the effect of anti-backfire and gas collection and distribution, and is divided into formaldehyde tail gas water seal tank, C5 waste gas water seal tank and glyoxal waste gas water seal tank according to waste gas characteristics.

[0036] The above is only the preferred embodiment of the utility model, and it should be pointed out that for those skilled in the art, without departing from the concept of the utility model, a number of deformations and improvements can be made, which should be considered as the protection scope of the utility model, and these will not affect the effect and practicality of the utility model implementation.

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. In the description of the present application, it should be understood that the terms "center", "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0038] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A silver-process formaldehyde and organic waste gas incineration and waste heat recovery device, characterized in that: Including provided with a first incinerator, second incinerator, induced draft fan and waste heat recovery system;The waste heat recovery system is arranged at the rear end of the first incinerator, and the induced draft fan is arranged at the rear end of the waste heat recovery system; The first incinerator uses formaldehyde tail gas as main fuel, urea-formaldehyde resin waste gas and workshop low concentration waste gas as part of combustion air, and 80% of 600Nm³ / h of glyoxal waste gas is introduced into the first incinerator for incineration for more than 3 seconds; The second incinerator uses formaldehyde tail gas as long-lasting fire, and C5 waste gas is pressurized by Roots blower to combustor two, while part of glyoxal waste gas is incinerated; The waste heat recovery system is composed of waste heat steam boiler, economizer, formaldehyde tail gas preheater and air preheater, and the rear end of the air preheater is provided with an induced draft fan.

2. The silver method formaldehyde and organic waste gas incineration and waste heat recovery device according to claim 1, characterized in that: The C5 is combusted by the way of pressurizing and then injecting into the furnace; The aldehyde resin waste gas and the workshop low concentration waste gas are introduced into the combustor one by the air blower; The glyoxal waste gas is directly introduced into the high-temperature flue gas for incineration.

3. The silver method formaldehyde and organic waste gas incineration and waste heat recovery device according to claim 1, characterized in that: The waste heat steam boiler, economizer, air preheater, formaldehyde tail gas preheater are connected by pipelines.

4. The silver method formaldehyde and organic waste gas incineration and waste heat recovery device according to claim 1, characterized in that: Flow meters are arranged on the input pipelines of the first incinerator and the second incinerator for the formaldehyde tail gas, flow meters are arranged on the pipeline leading to the combustor two of the second incinerator for the pressurized C5 waste gas, flow meters are arranged on the pipelines leading to the first incinerator and the second incinerator for the glyoxal waste gas, flow meters are arranged on the pipeline for the urea-formaldehyde resin waste gas and the workshop low concentration waste gas to enter the first incinerator as combustion air, and flow meters are arranged on the outlet pipelines of the first incinerator and the second incinerator.

5. The silver method formaldehyde and organic waste gas incineration and waste heat recovery device according to claim 1, characterized in that: Pressure sensors are arranged on the inlet and outlet of the Roots blower for the C5 waste gas, pressure sensors are arranged on the input pipelines of the first incinerator and the second incinerator for the formaldehyde tail gas, pressure sensors are arranged on the pipelines leading to the first incinerator and the second incinerator for the glyoxal waste gas, and pressure sensors are arranged on the pipeline for the urea-formaldehyde resin waste gas and the workshop low concentration waste gas to enter the first incinerator as combustion air.

6. The silver method formaldehyde and organic waste gas incineration and waste heat recovery device according to claim 1, characterized in that: Corrosion-resistant flow guide devices are arranged at the positions where the glyoxal waste gas is introduced into the high-temperature flue gas.

7. The silver method formaldehyde and organic waste gas incineration and waste heat recovery device according to claim 1, characterized in that: Water seal tanks are arranged on the pipelines for the formaldehyde tail gas to enter the first incinerator, on the pipelines for the glyoxal waste gas to enter the second incinerator, and on the exhaust pipelines of the C5 waste gas.

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