	US 11,940,213 B2
	Thermodynamically regulated method and thermodynamically regulated drying system for drying goods to be dried
Franz Leers, Ahaus (DE); Fokko Johann Crone, Rhauderfehn (DE); and Andreas Schaake, Dresden (DE)
Assigned to WENKER GMBH & CO. KG, Ahaus (DE)
Appl. No. 17/261,021
Filed by WENKER GMBH & CO. KG, Ahaus (DE)
PCT Filed Jul. 10, 2019, PCT No. PCT/EP2019/000207 § 371(c)(1), (2) Date Jan. 17, 2021, PCT Pub. No. WO2020/015846, PCT Pub. Date Jan. 23, 2020.
Claims priority of application No. 10 2018 005 578.8 (DE), filed on Jul. 16, 2018.
Prior Publication US 2021/0293482 A1, Sep. 23, 2021
Int. Cl. F26B 21/10 (2006.01); F26B 15/12 (2006.01); F26B 21/12 (2006.01); F26B 23/00 (2006.01)

CPC F26B 21/10 (2013.01) [F26B 21/12 (2013.01); F26B 23/002 (2013.01); F26B 15/12 (2013.01)]

14 Claims

1. A thermodynamically controllable drying plant for drying of drying goods, comprising:

at least one drying tunnel through which drying goods can be conveyed in a conveying direction;

at least one heat exchanger;

at least one blower controlled by a frequency converter for controlled transport of exhaust gas from the at least one drying tunnel to the at least one heat exchanger;

at least one exhaust gas pipe downstream of the at least one heat exchanger through which the exhaust gas is transportable in varying amounts to at least one burner in at least one combustion chamber of at least one thermal post-combustion facility, the at least one exhaust gas pipe containing volatile organic compounds out of the at least one drying tunnel;

at least one cold bypass circumventing the at least one heat exchanger and connecting the at least one exhaust gas pipe upstream of the at least one heat exchanger with the at least one exhaust gas pipe downstream of the at least one heat exchanger, wherein the at least one cold bypass is controllable with at least one electronically regulated control station;

at least one fuel pipe through which fuel is controllably transportable to the at the least one burner;

at least one clean gas pipe through which clean gas is transportable from the at least one combustion chamber to the at least one heat exchanger, the clean gas having variable temperatures,

wherein the exhaust gas is variably heated by the clean gas at the least one heat exchanger,

wherein the at least one clean gas pipe transports variably cooled clean gas from the at least one heat exchanger to at least one heat consumer (WA), and

wherein the at least one clean gas pipe transports the variably cooled clean gas to at least one chimney, where the variably cooled clean gas is releasable into atmosphere as clean gas exhaust;

at least one heater by which the at least one drying zone is heatable by the at least one heat consumer;

at least one thermodynamic control unit having an algorithm based on;

Equation I: Control Equation for a measuring station downstream of the heat exchanger:

Ė_TNV[W]+Ė_AG[W]=Ė_WA[W]+Ė_RGD[W];

Equation II: Control Equation relative to a vantage point of the at least one thermal post-combustion facility:

Ė_TNV[W]=Ė_WA[W]+Ė_RGD[W]−Ė_AG[W];

Equation III: control difference Δ upstream of the control unit:

Δ={Ė_WA[W]+Ė_RGD[W]−Ė_AG[W]}−Ė_TNV[W];

with Ė_WA[W] Ė_RGD[W]−Ė_AG[W]=target value and Ė_TNV[W]=actual value, wherein the target value is defined as follows:

(i) Ė_WA[W] as a heat reduction of the drying plant to be compensated,

(ii) Ė_AG[W] as a recuperation of heat from the drying plant to be compensated/included, and

(iii) Ė_RGD[W] as an energy content of the clean gas exhaust;

Regulating Variable: a volume stream V at normal or standard conditions (temperature=273.15 K, pressure=1013.25 mbar); and

Equation IV: a combustion chamber temperature:

T_BK=f(V_variabel),

wherein V_variabel=volume stream of the clean gas in the at least one clean gas pipe.